diff --git a/Cargo.lock b/Cargo.lock
index faed52727c8..f15e319e3b8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,9 +4,9 @@ version = 3
 
 [[package]]
 name = "anyhow"
-version = "1.0.51"
+version = "1.0.53"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b26702f315f53b6071259e15dd9d64528213b44d61de1ec926eca7715d62203"
+checksum = "94a45b455c14666b85fc40a019e8ab9eb75e3a124e05494f5397122bc9eb06e0"
 
 [[package]]
 name = "ar"
@@ -33,18 +33,18 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "cranelift-bforest"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc0cb7df82c8cf8f2e6a8dd394a0932a71369c160cc9b027dca414fced242513"
+checksum = "71447555acc6c875c52c407d572fc1327dc5c34cba72b4b2e7ad048aa4e4fd19"
 dependencies = [
  "cranelift-entity",
 ]
 
 [[package]]
 name = "cranelift-codegen"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe4463c15fa42eee909e61e5eac4866b7c6d22d0d8c621e57a0c5380753bfa8c"
+checksum = "ec9a10261891a7a919b0d4f6aa73582e88441d9a8f6173c88efbe4a5a362ea67"
 dependencies = [
  "cranelift-bforest",
  "cranelift-codegen-meta",
@@ -59,31 +59,30 @@ dependencies = [
 
 [[package]]
 name = "cranelift-codegen-meta"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "793f6a94a053a55404ea16e1700202a88101672b8cd6b4df63e13cde950852bf"
+checksum = "815755d76fcbcf6e17ab888545b28ab775f917cb12ce0797e60cd41a2288692c"
 dependencies = [
  "cranelift-codegen-shared",
- "cranelift-entity",
 ]
 
 [[package]]
 name = "cranelift-codegen-shared"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44aa1846df275bce5eb30379d65964c7afc63c05a117076e62a119c25fe174be"
+checksum = "23ea92f2a67335a2e4d3c9c65624c3b14ae287d595b0650822c41824febab66b"
 
 [[package]]
 name = "cranelift-entity"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3a45d8d6318bf8fc518154d9298eab2a8154ec068a8885ff113f6db8d69bb3a"
+checksum = "bd25847875e388c500ad3624b4d2e14067955c93185194a7222246a25b91c975"
 
 [[package]]
 name = "cranelift-frontend"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e07339bd461766deb7605169de039e01954768ff730fa1254e149001884a8525"
+checksum = "308bcfb7eb47bdf5ff6e1ace262af4ed39ec19f204c751fffb037e0e82a0c8bf"
 dependencies = [
  "cranelift-codegen",
  "log",
@@ -93,9 +92,9 @@ dependencies = [
 
 [[package]]
 name = "cranelift-jit"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e8f0d60fb5d67f7a1e5c49db38ba96d1c846921faef02085fc5590b74781747"
+checksum = "f560b3a314b8d15facf411e5d29b917c3e787a2bbc3fcdc5183bc0c5b7d4fe01"
 dependencies = [
  "anyhow",
  "cranelift-codegen",
@@ -111,21 +110,19 @@ dependencies = [
 
 [[package]]
 name = "cranelift-module"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "825ac7e0959cbe7ddc9cc21209f0319e611a57f9fcb2b723861fe7ef2017e651"
+checksum = "3a57aba9e603d694d1430ff38bd914bae23ef9c2e44b25a65e318905807e654c"
 dependencies = [
  "anyhow",
  "cranelift-codegen",
- "cranelift-entity",
- "log",
 ]
 
 [[package]]
 name = "cranelift-native"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03e2fca76ff57e0532936a71e3fc267eae6a19a86656716479c66e7f912e3d7b"
+checksum = "12cdc799aee673be2317e631d4569a1ba0a7e77a07a7ce45557086d2e02e9514"
 dependencies = [
  "cranelift-codegen",
  "libc",
@@ -134,9 +131,9 @@ dependencies = [
 
 [[package]]
 name = "cranelift-object"
-version = "0.78.0"
+version = "0.81.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "55500d0fc9bb05c0944fc4506649249d28f55bd4fe95b87f0e55bf41058f0e6d"
+checksum = "502a7333836052fcdf4425d7f7a21264d99f862d32b9c3a0e47cd920487a9b60"
 dependencies = [
  "anyhow",
  "cranelift-codegen",
@@ -148,18 +145,18 @@ dependencies = [
 
 [[package]]
 name = "crc32fast"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "738c290dfaea84fc1ca15ad9c168d083b05a714e1efddd8edaab678dc28d2836"
+checksum = "a2209c310e29876f7f0b2721e7e26b84aff178aa3da5d091f9bfbf47669e60e3"
 dependencies = [
  "cfg-if",
 ]
 
 [[package]]
 name = "gimli"
-version = "0.25.0"
+version = "0.26.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0a01e0497841a3b2db4f8afa483cce65f7e96a3498bd6c541734792aeac8fe7"
+checksum = "78cc372d058dcf6d5ecd98510e7fbc9e5aec4d21de70f65fea8fecebcd881bd4"
 dependencies = [
  "indexmap",
 ]
@@ -182,9 +179,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.112"
+version = "0.2.116"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b03d17f364a3a042d5e5d46b053bbbf82c92c9430c592dd4c064dc6ee997125"
+checksum = "565dbd88872dbe4cc8a46e527f26483c1d1f7afa6b884a3bd6cd893d4f98da74"
 
 [[package]]
 name = "libloading"
@@ -233,9 +230,9 @@ dependencies = [
 
 [[package]]
 name = "regalloc"
-version = "0.0.32"
+version = "0.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6304468554ed921da3d32c355ea107b8d13d7b8996c3adfb7aab48d3bc321f4"
+checksum = "62446b1d3ebf980bdc68837700af1d77b37bc430e524bf95319c6eada2a4cc02"
 dependencies = [
  "log",
  "rustc-hash",
@@ -281,9 +278,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.7.0"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ecab6c735a6bb4139c0caafd0cc3635748bbb3acf4550e8138122099251f309"
+checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
 
 [[package]]
 name = "target-lexicon"
diff --git a/Cargo.toml b/Cargo.toml
index 2d19040b509..178404af42d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,14 +8,14 @@ crate-type = ["dylib"]
 
 [dependencies]
 # These have to be in sync with each other
-cranelift-codegen = { version = "0.78.0", features = ["unwind", "all-arch"] }
-cranelift-frontend = "0.78.0"
-cranelift-module = "0.78.0"
-cranelift-native = "0.78.0"
-cranelift-jit = { version = "0.78.0", optional = true }
-cranelift-object = "0.78.0"
+cranelift-codegen = { version = "0.81.0", features = ["unwind", "all-arch"] }
+cranelift-frontend = "0.81.0"
+cranelift-module = "0.81.0"
+cranelift-native = "0.81.0"
+cranelift-jit = { version = "0.81.0", optional = true }
+cranelift-object = "0.81.0"
 target-lexicon = "0.12.0"
-gimli = { version = "0.25.0", default-features = false, features = ["write"]}
+gimli = { version = "0.26.0", default-features = false, features = ["write"]}
 object = { version = "0.27.0", default-features = false, features = ["std", "read_core", "write", "archive", "coff", "elf", "macho", "pe"] }
 
 ar = { git = "https://github.com/bjorn3/rust-ar.git", branch = "do_not_remove_cg_clif_ranlib" }
diff --git a/build_sysroot/Cargo.lock b/build_sysroot/Cargo.lock
index dd096562480..b9786395142 100644
--- a/build_sysroot/Cargo.lock
+++ b/build_sysroot/Cargo.lock
@@ -34,15 +34,15 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
-version = "1.0.1"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "cc"
-version = "1.0.72"
+version = "1.0.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22a9137b95ea06864e018375b72adfb7db6e6f68cfc8df5a04d00288050485ee"
+checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
 
 [[package]]
 name = "cfg-if"
@@ -56,7 +56,7 @@ dependencies = [
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.66"
+version = "0.1.70"
 dependencies = [
  "rustc-std-workspace-core",
 ]
@@ -110,9 +110,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.11.2"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
+checksum = "8c21d40587b92fa6a6c6e3c1bdbf87d75511db5672f9c93175574b3a00df1758"
 dependencies = [
  "compiler_builtins",
  "rustc-std-workspace-alloc",
@@ -121,9 +121,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.19"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+checksum = "1ab7905ea95c6d9af62940f9d7dd9596d54c334ae2c15300c482051292d5637f"
 dependencies = [
  "compiler_builtins",
  "libc",
@@ -132,9 +132,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.112"
+version = "0.2.119"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b03d17f364a3a042d5e5d46b053bbbf82c92c9430c592dd4c064dc6ee997125"
+checksum = "1bf2e165bb3457c8e098ea76f3e3bc9db55f87aa90d52d0e6be741470916aaa4"
 dependencies = [
  "rustc-std-workspace-core",
 ]
@@ -319,9 +319,9 @@ dependencies = [
 
 [[package]]
 name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
+version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 dependencies = [
  "compiler_builtins",
  "rustc-std-workspace-alloc",
diff --git a/build_system/build_backend.rs b/build_system/build_backend.rs
index 1382c7e5379..0a56eb131ed 100644
--- a/build_system/build_backend.rs
+++ b/build_system/build_backend.rs
@@ -49,7 +49,7 @@ pub(crate) fn build_backend(
     cmd.env("RUSTFLAGS", rustflags);
 
     eprintln!("[BUILD] rustc_codegen_cranelift");
-    crate::utils::spawn_and_wait(cmd);
+    super::utils::spawn_and_wait(cmd);
 
     Path::new("target").join(host_triple).join(channel)
 }
diff --git a/build_system/build_sysroot.rs b/build_system/build_sysroot.rs
index 2956fb698e1..c9c003d4610 100644
--- a/build_system/build_sysroot.rs
+++ b/build_system/build_sysroot.rs
@@ -3,9 +3,9 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::{self, Command};
 
-use crate::rustc_info::{get_file_name, get_rustc_version};
-use crate::utils::{spawn_and_wait, try_hard_link};
-use crate::SysrootKind;
+use super::rustc_info::{get_file_name, get_rustc_version};
+use super::utils::{spawn_and_wait, try_hard_link};
+use super::SysrootKind;
 
 pub(crate) fn build_sysroot(
     channel: &str,
@@ -52,7 +52,7 @@ pub(crate) fn build_sysroot(
         .arg("-g");
     spawn_and_wait(build_cargo_wrapper_cmd);
 
-    let default_sysroot = crate::rustc_info::get_default_sysroot();
+    let default_sysroot = super::rustc_info::get_default_sysroot();
 
     let rustlib = target_dir.join("lib").join("rustlib");
     let host_rustlib_lib = rustlib.join(host_triple).join("lib");
@@ -167,7 +167,7 @@ fn build_clif_sysroot_for_triple(
 
     let build_dir = Path::new("build_sysroot").join("target").join(triple).join(channel);
 
-    if !crate::config::get_bool("keep_sysroot") {
+    if !super::config::get_bool("keep_sysroot") {
         // Cleanup the target dir with the exception of build scripts and the incremental cache
         for dir in ["build", "deps", "examples", "native"] {
             if build_dir.join(dir).exists() {
diff --git a/build_system/mod.rs b/build_system/mod.rs
new file mode 100644
index 00000000000..b228da3981f
--- /dev/null
+++ b/build_system/mod.rs
@@ -0,0 +1,127 @@
+use std::env;
+use std::path::PathBuf;
+use std::process;
+
+mod build_backend;
+mod build_sysroot;
+mod config;
+mod prepare;
+mod rustc_info;
+mod utils;
+
+fn usage() {
+    eprintln!("Usage:");
+    eprintln!("  ./y.rs prepare");
+    eprintln!(
+        "  ./y.rs build [--debug] [--sysroot none|clif|llvm] [--target-dir DIR] [--no-unstable-features]"
+    );
+}
+
+macro_rules! arg_error {
+    ($($err:tt)*) => {{
+        eprintln!($($err)*);
+        usage();
+        std::process::exit(1);
+    }};
+}
+
+enum Command {
+    Build,
+}
+
+#[derive(Copy, Clone)]
+pub(crate) enum SysrootKind {
+    None,
+    Clif,
+    Llvm,
+}
+
+pub fn main() {
+    env::set_var("CG_CLIF_DISPLAY_CG_TIME", "1");
+    env::set_var("CG_CLIF_DISABLE_INCR_CACHE", "1");
+    // The target dir is expected in the default location. Guard against the user changing it.
+    env::set_var("CARGO_TARGET_DIR", "target");
+
+    let mut args = env::args().skip(1);
+    let command = match args.next().as_deref() {
+        Some("prepare") => {
+            if args.next().is_some() {
+                arg_error!("./x.rs prepare doesn't expect arguments");
+            }
+            prepare::prepare();
+            process::exit(0);
+        }
+        Some("build") => Command::Build,
+        Some(flag) if flag.starts_with('-') => arg_error!("Expected command found flag {}", flag),
+        Some(command) => arg_error!("Unknown command {}", command),
+        None => {
+            usage();
+            process::exit(0);
+        }
+    };
+
+    let mut target_dir = PathBuf::from("build");
+    let mut channel = "release";
+    let mut sysroot_kind = SysrootKind::Clif;
+    let mut use_unstable_features = true;
+    while let Some(arg) = args.next().as_deref() {
+        match arg {
+            "--target-dir" => {
+                target_dir = PathBuf::from(args.next().unwrap_or_else(|| {
+                    arg_error!("--target-dir requires argument");
+                }))
+            }
+            "--debug" => channel = "debug",
+            "--sysroot" => {
+                sysroot_kind = match args.next().as_deref() {
+                    Some("none") => SysrootKind::None,
+                    Some("clif") => SysrootKind::Clif,
+                    Some("llvm") => SysrootKind::Llvm,
+                    Some(arg) => arg_error!("Unknown sysroot kind {}", arg),
+                    None => arg_error!("--sysroot requires argument"),
+                }
+            }
+            "--no-unstable-features" => use_unstable_features = false,
+            flag if flag.starts_with("-") => arg_error!("Unknown flag {}", flag),
+            arg => arg_error!("Unexpected argument {}", arg),
+        }
+    }
+
+    let host_triple = if let Ok(host_triple) = std::env::var("HOST_TRIPLE") {
+        host_triple
+    } else if let Some(host_triple) = config::get_value("host") {
+        host_triple
+    } else {
+        rustc_info::get_host_triple()
+    };
+    let target_triple = if let Ok(target_triple) = std::env::var("TARGET_TRIPLE") {
+        if target_triple != "" {
+            target_triple
+        } else {
+            host_triple.clone() // Empty target triple can happen on GHA
+        }
+    } else if let Some(target_triple) = config::get_value("target") {
+        target_triple
+    } else {
+        host_triple.clone()
+    };
+
+    if target_triple.ends_with("-msvc") {
+        eprintln!("The MSVC toolchain is not yet supported by rustc_codegen_cranelift.");
+        eprintln!("Switch to the MinGW toolchain for Windows support.");
+        eprintln!("Hint: You can use `rustup set default-host x86_64-pc-windows-gnu` to");
+        eprintln!("set the global default target to MinGW");
+        process::exit(1);
+    }
+
+    let cg_clif_build_dir =
+        build_backend::build_backend(channel, &host_triple, use_unstable_features);
+    build_sysroot::build_sysroot(
+        channel,
+        sysroot_kind,
+        &target_dir,
+        cg_clif_build_dir,
+        &host_triple,
+        &target_triple,
+    );
+}
diff --git a/build_system/prepare.rs b/build_system/prepare.rs
index 561e2ed7b00..4a7df2cebbc 100644
--- a/build_system/prepare.rs
+++ b/build_system/prepare.rs
@@ -5,8 +5,8 @@ use std::fs;
 use std::path::Path;
 use std::process::Command;
 
-use crate::rustc_info::{get_file_name, get_rustc_path, get_rustc_version};
-use crate::utils::{copy_dir_recursively, spawn_and_wait};
+use super::rustc_info::{get_file_name, get_rustc_path, get_rustc_version};
+use super::utils::{copy_dir_recursively, spawn_and_wait};
 
 pub(crate) fn prepare() {
     prepare_sysroot();
@@ -92,7 +92,7 @@ fn prepare_sysroot() {
     clone_repo(
         "build_sysroot/compiler-builtins",
         "https://github.com/rust-lang/compiler-builtins.git",
-        "0.1.66",
+        "0.1.70",
     );
     apply_patches("compiler-builtins", Path::new("build_sysroot/compiler-builtins"));
 }
diff --git a/clean_all.sh b/clean_all.sh
index 865de7d234f..ea1f8c1e892 100755
--- a/clean_all.sh
+++ b/clean_all.sh
@@ -2,5 +2,5 @@
 set -e
 
 rm -rf build_sysroot/{sysroot_src/,target/,compiler-builtins/,rustc_version}
-rm -rf target/ build/ perf.data{,.old}
+rm -rf target/ build/ perf.data{,.old} y.bin
 rm -rf rand/ regex/ simple-raytracer/ portable-simd/
diff --git a/patches/0001-compiler-builtins-Disable-128bit-atomic-operations.patch b/patches/0001-compiler-builtins-Disable-128bit-atomic-operations.patch
index 7daea99f579..460e42d1d8c 100644
--- a/patches/0001-compiler-builtins-Disable-128bit-atomic-operations.patch
+++ b/patches/0001-compiler-builtins-Disable-128bit-atomic-operations.patch
@@ -13,33 +13,33 @@ index 107762c..2d1ae10 100644
 --- a/src/mem/mod.rs
 +++ b/src/mem/mod.rs
 @@ -137,10 +137,6 @@ intrinsics! {
-     pub extern "C" fn __llvm_memcpy_element_unordered_atomic_8(dest: *mut u64, src: *const u64, bytes: usize) -> () {
+     pub unsafe extern "C" fn __llvm_memcpy_element_unordered_atomic_8(dest: *mut u64, src: *const u64, bytes: usize) -> () {
          memcpy_element_unordered_atomic(dest, src, bytes);
      }
 -    #[cfg(target_has_atomic_load_store = "128")]
--    pub extern "C" fn __llvm_memcpy_element_unordered_atomic_16(dest: *mut u128, src: *const u128, bytes: usize) -> () {
+-    pub unsafe extern "C" fn __llvm_memcpy_element_unordered_atomic_16(dest: *mut u128, src: *const u128, bytes: usize) -> () {
 -        memcpy_element_unordered_atomic(dest, src, bytes);
 -    }
  
      #[cfg(target_has_atomic_load_store = "8")]
-     pub extern "C" fn __llvm_memmove_element_unordered_atomic_1(dest: *mut u8, src: *const u8, bytes: usize) -> () {
+     pub unsafe extern "C" fn __llvm_memmove_element_unordered_atomic_1(dest: *mut u8, src: *const u8, bytes: usize) -> () {
 @@ -158,10 +154,6 @@ intrinsics! {
-     pub extern "C" fn __llvm_memmove_element_unordered_atomic_8(dest: *mut u64, src: *const u64, bytes: usize) -> () {
+     pub unsafe extern "C" fn __llvm_memmove_element_unordered_atomic_8(dest: *mut u64, src: *const u64, bytes: usize) -> () {
          memmove_element_unordered_atomic(dest, src, bytes);
      }
 -    #[cfg(target_has_atomic_load_store = "128")]
--    pub extern "C" fn __llvm_memmove_element_unordered_atomic_16(dest: *mut u128, src: *const u128, bytes: usize) -> () {
+-    pub unsafe extern "C" fn __llvm_memmove_element_unordered_atomic_16(dest: *mut u128, src: *const u128, bytes: usize) -> () {
 -        memmove_element_unordered_atomic(dest, src, bytes);
 -    }
  
      #[cfg(target_has_atomic_load_store = "8")]
-     pub extern "C" fn __llvm_memset_element_unordered_atomic_1(s: *mut u8, c: u8, bytes: usize) -> () {
+     pub unsafe extern "C" fn __llvm_memset_element_unordered_atomic_1(s: *mut u8, c: u8, bytes: usize) -> () {
 @@ -179,8 +171,4 @@ intrinsics! {
-     pub extern "C" fn __llvm_memset_element_unordered_atomic_8(s: *mut u64, c: u8, bytes: usize) -> () {
+     pub unsafe extern "C" fn __llvm_memset_element_unordered_atomic_8(s: *mut u64, c: u8, bytes: usize) -> () {
          memset_element_unordered_atomic(s, c, bytes);
      }
 -    #[cfg(target_has_atomic_load_store = "128")]
--    pub extern "C" fn __llvm_memset_element_unordered_atomic_16(s: *mut u128, c: u8, bytes: usize) -> () {
+-    pub unsafe extern "C" fn __llvm_memset_element_unordered_atomic_16(s: *mut u128, c: u8, bytes: usize) -> () {
 -        memset_element_unordered_atomic(s, c, bytes);
 -    }
  }
diff --git a/patches/0022-sysroot-Disable-not-compiling-tests.patch b/patches/0022-sysroot-Disable-not-compiling-tests.patch
index 25a315f666e..1c45c7573c8 100644
--- a/patches/0022-sysroot-Disable-not-compiling-tests.patch
+++ b/patches/0022-sysroot-Disable-not-compiling-tests.patch
@@ -22,7 +22,7 @@ index 0000000..46fd999
 +[package]
 +name = "core"
 +version = "0.0.0"
-+edition = "2018"
++edition = "2021"
 +
 +[lib]
 +name = "coretests"
@@ -44,7 +44,7 @@ index 1a6be3a..42dbd59 100644
 --- a/library/core/tests/ptr.rs
 +++ b/library/core/tests/ptr.rs
 @@ -250,6 +250,7 @@ fn test_unsized_nonnull() {
-     assert!(ys == zs);
+     };
  }
  
 +/*
diff --git a/patches/0027-sysroot-128bit-atomic-operations.patch b/patches/0027-sysroot-128bit-atomic-operations.patch
index ffee641457a..8e6652af374 100644
--- a/patches/0027-sysroot-128bit-atomic-operations.patch
+++ b/patches/0027-sysroot-128bit-atomic-operations.patch
@@ -8,7 +8,6 @@ Cranelift doesn't support them yet
  library/core/src/panic/unwind_safe.rs |  6 -----
  library/core/src/sync/atomic.rs       | 38 ---------------------------
  library/core/tests/atomic.rs          |  4 ---
- library/std/src/time/monotonic.rs     |  6 +++--
  4 files changed, 4 insertions(+), 50 deletions(-)
 
 diff --git a/library/core/src/panic/unwind_safe.rs b/library/core/src/panic/unwind_safe.rs
@@ -99,38 +98,6 @@ index b735957..ea728b6 100644
      #[cfg(target_has_atomic = "ptr")]
      assert_eq!(align_of::<AtomicUsize>(), size_of::<AtomicUsize>());
      #[cfg(target_has_atomic = "ptr")]
-diff --git a/library/std/src/time/monotonic.rs b/library/std/src/time/monotonic.rs
-index fa96b7a..2854f9c 100644
---- a/library/std/src/time/monotonic.rs
-+++ b/library/std/src/time/monotonic.rs
-@@ -5,7 +5,7 @@ pub(super) fn monotonize(raw: time::Instant) -> time::Instant {
-     inner::monotonize(raw)
- }
- 
--#[cfg(any(all(target_has_atomic = "64", not(target_has_atomic = "128")), target_arch = "aarch64"))]
-+#[cfg(target_has_atomic = "64")]
- pub mod inner {
-     use crate::sync::atomic::AtomicU64;
-     use crate::sync::atomic::Ordering::*;
-@@ -70,6 +70,7 @@ pub mod inner {
-     }
- }
- 
-+/*
- #[cfg(all(target_has_atomic = "128", not(target_arch = "aarch64")))]
- pub mod inner {
-     use crate::sync::atomic::AtomicU128;
-@@ -94,8 +95,9 @@ pub mod inner {
-         ZERO.checked_add_duration(&Duration::new(secs, nanos)).unwrap()
-     }
- }
-+*/
- 
--#[cfg(not(any(target_has_atomic = "64", target_has_atomic = "128")))]
-+#[cfg(not(target_has_atomic = "64"))]
- pub mod inner {
-     use crate::cmp;
-     use crate::sys::time;
 -- 
 2.26.2.7.g19db9cfb68
 
diff --git a/rust-toolchain b/rust-toolchain
index cab94c0b8cf..1019b1f069e 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2021-12-30"
+channel = "nightly-2022-02-23"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]
diff --git a/scripts/test_rustc_tests.sh b/scripts/test_rustc_tests.sh
index 6bcc3049ecc..b146ea36037 100755
--- a/scripts/test_rustc_tests.sh
+++ b/scripts/test_rustc_tests.sh
@@ -8,7 +8,7 @@ source ./scripts/setup_rust_fork.sh
 echo "[TEST] Test suite of rustc"
 pushd rust
 
-cargo install ripgrep
+command -v rg >/dev/null 2>&1 || cargo install ripgrep
 
 rm -r src/test/ui/{extern/,panics/,unsized-locals/,lto/,simd*,linkage*,unwind-*.rs} || true
 for test in $(rg --files-with-matches "asm!|catch_unwind|should_panic|lto|// needs-asm-support" src/test/ui); do
@@ -78,6 +78,8 @@ rm src/test/ui/intrinsics/const-eval-select-x86_64.rs # same
 rm src/test/ui/match/issue-82392.rs # differing error
 rm src/test/ui/consts/min_const_fn/address_of_const.rs # same
 rm src/test/ui/consts/issue-miri-1910.rs # same
+rm src/test/ui/generic-associated-types/bugs/issue-80626.rs # same
+rm src/test/ui/generic-associated-types/bugs/issue-89008.rs # same
 rm src/test/ui/type-alias-impl-trait/cross_crate_ice*.rs # requires removed aux dep
 
 rm src/test/ui/allocator/no_std-alloc-error-handler-default.rs # missing rust_oom definition
@@ -98,6 +100,7 @@ rm src/test/ui/abi/stack-protector.rs # requires stack protector support
 rm src/test/incremental/issue-80691-bad-eval-cache.rs # wrong exit code
 rm src/test/incremental/spike-neg1.rs # errors out for some reason
 rm src/test/incremental/spike-neg2.rs # same
+rm src/test/ui/issues/issue-74564-if-expr-stack-overflow.rs # gives a stackoverflow before the backend runs
 
 rm src/test/incremental/thinlto/cgu_invalidated_when_import_{added,removed}.rs # requires LLVM
 
diff --git a/src/allocator.rs b/src/allocator.rs
index 637d30f9344..82247b47888 100644
--- a/src/allocator.rs
+++ b/src/allocator.rs
@@ -3,7 +3,6 @@
 
 use crate::prelude::*;
 
-use cranelift_codegen::binemit::{NullStackMapSink, NullTrapSink};
 use rustc_ast::expand::allocator::{AllocatorKind, AllocatorTy, ALLOCATOR_METHODS};
 
 /// Returns whether an allocator shim was created
@@ -91,9 +90,7 @@ fn codegen_inner(
             bcx.seal_all_blocks();
             bcx.finalize();
         }
-        module
-            .define_function(func_id, &mut ctx, &mut NullTrapSink {}, &mut NullStackMapSink {})
-            .unwrap();
+        module.define_function(func_id, &mut ctx).unwrap();
         unwind_context.add_function(func_id, &ctx, module.isa());
     }
 
@@ -130,8 +127,6 @@ fn codegen_inner(
         bcx.seal_all_blocks();
         bcx.finalize();
     }
-    module
-        .define_function(func_id, &mut ctx, &mut NullTrapSink {}, &mut NullStackMapSink {})
-        .unwrap();
+    module.define_function(func_id, &mut ctx).unwrap();
     unwind_context.add_function(func_id, &ctx, module.isa());
 }
diff --git a/src/base.rs b/src/base.rs
index 917afa4eae0..0a6ef6441fa 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -1,13 +1,15 @@
 //! Codegen of a single function
 
-use cranelift_codegen::binemit::{NullStackMapSink, NullTrapSink};
 use rustc_ast::InlineAsmOptions;
 use rustc_index::vec::IndexVec;
 use rustc_middle::ty::adjustment::PointerCast;
 use rustc_middle::ty::layout::FnAbiOf;
 
+use indexmap::IndexSet;
+
 use crate::constant::ConstantCx;
 use crate::prelude::*;
+use crate::pretty_clif::CommentWriter;
 
 pub(crate) fn codegen_fn<'tcx>(
     cx: &mut crate::CodegenCx<'tcx>,
@@ -99,27 +101,54 @@ pub(crate) fn codegen_fn<'tcx>(
 
     // Recover all necessary data from fx, before accessing func will prevent future access to it.
     let instance = fx.instance;
-    let mut clif_comments = fx.clif_comments;
+    let clif_comments = fx.clif_comments;
     let source_info_set = fx.source_info_set;
     let local_map = fx.local_map;
 
     fx.constants_cx.finalize(fx.tcx, &mut *fx.module);
 
-    // Store function in context
-    let context = &mut cx.cached_context;
-    context.func = func;
-
     crate::pretty_clif::write_clif_file(
         tcx,
         "unopt",
         module.isa(),
         instance,
-        &context,
+        &func,
         &clif_comments,
     );
 
     // Verify function
-    verify_func(tcx, &clif_comments, &context.func);
+    verify_func(tcx, &clif_comments, &func);
+
+    compile_fn(
+        cx,
+        module,
+        instance,
+        symbol_name.name,
+        func_id,
+        func,
+        clif_comments,
+        source_info_set,
+        local_map,
+    );
+}
+
+fn compile_fn<'tcx>(
+    cx: &mut crate::CodegenCx<'tcx>,
+    module: &mut dyn Module,
+    instance: Instance<'tcx>,
+    symbol_name: &str,
+    func_id: FuncId,
+    func: Function,
+    mut clif_comments: CommentWriter,
+    source_info_set: IndexSet<SourceInfo>,
+    local_map: IndexVec<mir::Local, CPlace<'tcx>>,
+) {
+    let tcx = cx.tcx;
+
+    // Store function in context
+    let context = &mut cx.cached_context;
+    context.clear();
+    context.func = func;
 
     // If the return block is not reachable, then the SSA builder may have inserted an `iconst.i128`
     // instruction, which doesn't have an encoding.
@@ -145,9 +174,7 @@ pub(crate) fn codegen_fn<'tcx>(
     // Define function
     tcx.sess.time("define function", || {
         context.want_disasm = crate::pretty_clif::should_write_ir(tcx);
-        module
-            .define_function(func_id, context, &mut NullTrapSink {}, &mut NullStackMapSink {})
-            .unwrap()
+        module.define_function(func_id, context).unwrap()
     });
 
     // Write optimized function to file for debugging
@@ -156,7 +183,7 @@ pub(crate) fn codegen_fn<'tcx>(
         "opt",
         module.isa(),
         instance,
-        &context,
+        &context.func,
         &clif_comments,
     );
 
@@ -177,7 +204,7 @@ pub(crate) fn codegen_fn<'tcx>(
             debug_context.define_function(
                 instance,
                 func_id,
-                symbol_name.name,
+                symbol_name,
                 isa,
                 context,
                 &source_info_set,
@@ -186,9 +213,6 @@ pub(crate) fn codegen_fn<'tcx>(
         }
         unwind_context.add_function(func_id, &context, isa);
     });
-
-    // Clear context to make it usable for the next function
-    context.clear();
 }
 
 pub(crate) fn verify_func(
diff --git a/src/driver/aot.rs b/src/driver/aot.rs
index 046e4393a68..2e047c7eea1 100644
--- a/src/driver/aot.rs
+++ b/src/driver/aot.rs
@@ -56,6 +56,9 @@ fn emit_module(
 
     let tmp_file = tcx.output_filenames(()).temp_path(OutputType::Object, Some(&name));
     let obj = product.object.write().unwrap();
+
+    tcx.sess.prof.artifact_size("object_file", name.clone(), obj.len().try_into().unwrap());
+
     if let Err(err) = std::fs::write(&tmp_file, obj) {
         tcx.sess.fatal(&format!("error writing object file: {}", err));
     }
diff --git a/src/driver/jit.rs b/src/driver/jit.rs
index 309d27090b5..9e07528313d 100644
--- a/src/driver/jit.rs
+++ b/src/driver/jit.rs
@@ -7,7 +7,6 @@ use std::lazy::SyncOnceCell;
 use std::os::raw::{c_char, c_int};
 use std::sync::{mpsc, Mutex};
 
-use cranelift_codegen::binemit::{NullStackMapSink, NullTrapSink};
 use rustc_codegen_ssa::CrateInfo;
 use rustc_middle::mir::mono::MonoItem;
 use rustc_session::Session;
@@ -381,12 +380,5 @@ fn codegen_shim<'tcx>(cx: &mut CodegenCx<'tcx>, module: &mut JITModule, inst: In
     let ret_vals = trampoline_builder.func.dfg.inst_results(call_inst).to_vec();
     trampoline_builder.ins().return_(&ret_vals);
 
-    module
-        .define_function(
-            func_id,
-            &mut cx.cached_context,
-            &mut NullTrapSink {},
-            &mut NullStackMapSink {},
-        )
-        .unwrap();
+    module.define_function(func_id, &mut cx.cached_context).unwrap();
 }
diff --git a/src/intrinsics/llvm.rs b/src/intrinsics/llvm.rs
index be3704ca276..098862b0662 100644
--- a/src/intrinsics/llvm.rs
+++ b/src/intrinsics/llvm.rs
@@ -8,14 +8,14 @@ use rustc_middle::ty::subst::SubstsRef;
 pub(crate) fn codegen_llvm_intrinsic_call<'tcx>(
     fx: &mut FunctionCx<'_, '_, 'tcx>,
     intrinsic: &str,
-    substs: SubstsRef<'tcx>,
+    _substs: SubstsRef<'tcx>,
     args: &[mir::Operand<'tcx>],
     destination: Option<(CPlace<'tcx>, BasicBlock)>,
 ) {
     let ret = destination.unwrap().0;
 
     intrinsic_match! {
-        fx, intrinsic, substs, args,
+        fx, intrinsic, args,
         _ => {
             fx.tcx.sess.warn(&format!("unsupported llvm intrinsic {}; replacing with trap", intrinsic));
             crate::trap::trap_unimplemented(fx, intrinsic);
@@ -52,8 +52,8 @@ pub(crate) fn codegen_llvm_intrinsic_call<'tcx>(
             ret.write_cvalue(fx, res);
         };
         "llvm.x86.sse2.cmp.ps" | "llvm.x86.sse2.cmp.pd", (c x, c y, o kind) {
-            let kind_const = crate::constant::mir_operand_get_const_val(fx, kind).expect("llvm.x86.sse2.cmp.* kind not const");
-            let flt_cc = match kind_const.try_to_bits(Size::from_bytes(1)).unwrap_or_else(|| panic!("kind not scalar: {:?}", kind_const)) {
+            let kind = crate::constant::mir_operand_get_const_val(fx, kind).expect("llvm.x86.sse2.cmp.* kind not const");
+            let flt_cc = match kind.try_to_bits(Size::from_bytes(1)).unwrap_or_else(|| panic!("kind not scalar: {:?}", kind)) {
                 0 => FloatCC::Equal,
                 1 => FloatCC::LessThan,
                 2 => FloatCC::LessThanOrEqual,
@@ -73,32 +73,30 @@ pub(crate) fn codegen_llvm_intrinsic_call<'tcx>(
                 kind => unreachable!("kind {:?}", kind),
             };
 
-            simd_pair_for_each_lane(fx, x, y, ret, |fx, lane_layout, res_lane_layout, x_lane, y_lane| {
-                let res_lane = match lane_layout.ty.kind() {
+            simd_pair_for_each_lane(fx, x, y, ret, &|fx, lane_ty, res_lane_ty, x_lane, y_lane| {
+                let res_lane = match lane_ty.kind() {
                     ty::Float(_) => fx.bcx.ins().fcmp(flt_cc, x_lane, y_lane),
-                    _ => unreachable!("{:?}", lane_layout.ty),
+                    _ => unreachable!("{:?}", lane_ty),
                 };
-                bool_to_zero_or_max_uint(fx, res_lane_layout, res_lane)
+                bool_to_zero_or_max_uint(fx, res_lane_ty, res_lane)
             });
         };
         "llvm.x86.sse2.psrli.d", (c a, o imm8) {
             let imm8 = crate::constant::mir_operand_get_const_val(fx, imm8).expect("llvm.x86.sse2.psrli.d imm8 not const");
-            simd_for_each_lane(fx, a, ret, |fx, _lane_layout, res_lane_layout, lane| {
-                let res_lane = match imm8.try_to_bits(Size::from_bytes(4)).unwrap_or_else(|| panic!("imm8 not scalar: {:?}", imm8)) {
+            simd_for_each_lane(fx, a, ret, &|fx, _lane_ty, _res_lane_ty, lane| {
+                match imm8.try_to_bits(Size::from_bytes(4)).unwrap_or_else(|| panic!("imm8 not scalar: {:?}", imm8)) {
                     imm8 if imm8 < 32 => fx.bcx.ins().ushr_imm(lane, i64::from(imm8 as u8)),
                     _ => fx.bcx.ins().iconst(types::I32, 0),
-                };
-                CValue::by_val(res_lane, res_lane_layout)
+                }
             });
         };
         "llvm.x86.sse2.pslli.d", (c a, o imm8) {
             let imm8 = crate::constant::mir_operand_get_const_val(fx, imm8).expect("llvm.x86.sse2.psrli.d imm8 not const");
-            simd_for_each_lane(fx, a, ret, |fx, _lane_layout, res_lane_layout, lane| {
-                let res_lane = match imm8.try_to_bits(Size::from_bytes(4)).unwrap_or_else(|| panic!("imm8 not scalar: {:?}", imm8)) {
+            simd_for_each_lane(fx, a, ret, &|fx, _lane_ty, _res_lane_ty, lane| {
+                match imm8.try_to_bits(Size::from_bytes(4)).unwrap_or_else(|| panic!("imm8 not scalar: {:?}", imm8)) {
                     imm8 if imm8 < 32 => fx.bcx.ins().ishl_imm(lane, i64::from(imm8 as u8)),
                     _ => fx.bcx.ins().iconst(types::I32, 0),
-                };
-                CValue::by_val(res_lane, res_lane_layout)
+                }
             });
         };
         "llvm.x86.sse2.storeu.dq", (v mem_addr, c a) {
diff --git a/src/intrinsics/mod.rs b/src/intrinsics/mod.rs
index 42717ad0ae0..4dfb13476c2 100644
--- a/src/intrinsics/mod.rs
+++ b/src/intrinsics/mod.rs
@@ -9,7 +9,8 @@ pub(crate) use cpuid::codegen_cpuid_call;
 pub(crate) use llvm::codegen_llvm_intrinsic_call;
 
 use rustc_middle::ty::print::with_no_trimmed_paths;
-use rustc_span::symbol::{kw, sym};
+use rustc_middle::ty::subst::SubstsRef;
+use rustc_span::symbol::{kw, sym, Symbol};
 
 use crate::prelude::*;
 use cranelift_codegen::ir::AtomicRmwOp;
@@ -30,51 +31,29 @@ macro intrinsic_pat {
 }
 
 macro intrinsic_arg {
-    (o $fx:expr, $arg:ident) => {
-        $arg
-    },
+    (o $fx:expr, $arg:ident) => {},
     (c $fx:expr, $arg:ident) => {
-        codegen_operand($fx, $arg)
+        let $arg = codegen_operand($fx, $arg);
     },
     (v $fx:expr, $arg:ident) => {
-        codegen_operand($fx, $arg).load_scalar($fx)
-    }
-}
-
-macro intrinsic_substs {
-    ($substs:expr, $index:expr,) => {},
-    ($substs:expr, $index:expr, $first:ident $(,$rest:ident)*) => {
-        let $first = $substs.type_at($index);
-        intrinsic_substs!($substs, $index+1, $($rest),*);
+        let $arg = codegen_operand($fx, $arg).load_scalar($fx);
     }
 }
 
 macro intrinsic_match {
-    ($fx:expr, $intrinsic:expr, $substs:expr, $args:expr,
+    ($fx:expr, $intrinsic:expr, $args:expr,
     _ => $unknown:block;
     $(
-        $($($name:tt).*)|+ $(if $cond:expr)?, $(<$($subst:ident),*>)? ($($a:ident $arg:ident),*) $content:block;
+        $($($name:tt).*)|+ $(if $cond:expr)?, ($($a:ident $arg:ident),*) $content:block;
     )*) => {
-        let _ = $substs; // Silence warning when substs is unused.
         match $intrinsic {
             $(
                 $(intrinsic_pat!($($name).*))|* $(if $cond)? => {
-                    #[allow(unused_parens, non_snake_case)]
-                    {
-                        $(
-                            intrinsic_substs!($substs, 0, $($subst),*);
-                        )?
-                        if let [$($arg),*] = $args {
-                            let ($($arg,)*) = (
-                                $(intrinsic_arg!($a $fx, $arg),)*
-                            );
-                            #[warn(unused_parens, non_snake_case)]
-                            {
-                                $content
-                            }
-                        } else {
-                            bug!("wrong number of args for intrinsic {:?}", $intrinsic);
-                        }
+                    if let [$($arg),*] = $args {
+                        $(intrinsic_arg!($a $fx, $arg);)*
+                        $content
+                    } else {
+                        bug!("wrong number of args for intrinsic {:?}", $intrinsic);
                     }
                 }
             )*
@@ -83,63 +62,21 @@ macro intrinsic_match {
     }
 }
 
-macro call_intrinsic_match {
-    ($fx:expr, $intrinsic:expr, $substs:expr, $ret:expr, $destination:expr, $args:expr, $(
-        $name:ident($($arg:ident),*) -> $ty:ident => $func:ident,
-    )*) => {
-        match $intrinsic {
-            $(
-                sym::$name => {
-                    assert!($substs.is_empty());
-                    if let [$(ref $arg),*] = *$args {
-                        let ($($arg,)*) = (
-                            $(codegen_operand($fx, $arg),)*
-                        );
-                        let res = $fx.easy_call(stringify!($func), &[$($arg),*], $fx.tcx.types.$ty);
-                        $ret.write_cvalue($fx, res);
-
-                        if let Some((_, dest)) = $destination {
-                            let ret_block = $fx.get_block(dest);
-                            $fx.bcx.ins().jump(ret_block, &[]);
-                            return;
-                        } else {
-                            unreachable!();
-                        }
-                    } else {
-                        bug!("wrong number of args for intrinsic {:?}", $intrinsic);
-                    }
-                }
-            )*
-            _ => {}
-        }
-    }
-}
-
-macro validate_atomic_type($fx:ident, $intrinsic:ident, $span:ident, $ty:expr) {
-    match $ty.kind() {
-        ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
-        _ => {
-            $fx.tcx.sess.span_err(
-                $span,
-                &format!(
-                    "`{}` intrinsic: expected basic integer or raw pointer type, found `{:?}`",
-                    $intrinsic, $ty
-                ),
-            );
-            // Prevent verifier error
-            crate::trap::trap_unreachable($fx, "compilation should not have succeeded");
-            return;
-        }
-    }
-}
-
-macro validate_simd_type($fx:ident, $intrinsic:ident, $span:ident, $ty:expr) {
-    if !$ty.is_simd() {
-        $fx.tcx.sess.span_err($span, &format!("invalid monomorphization of `{}` intrinsic: expected SIMD input type, found non-SIMD `{}`", $intrinsic, $ty));
-        // Prevent verifier error
-        crate::trap::trap_unreachable($fx, "compilation should not have succeeded");
-        return;
-    }
+fn report_atomic_type_validation_error<'tcx>(
+    fx: &mut FunctionCx<'_, '_, 'tcx>,
+    intrinsic: Symbol,
+    span: Span,
+    ty: Ty<'tcx>,
+) {
+    fx.tcx.sess.span_err(
+        span,
+        &format!(
+            "`{}` intrinsic: expected basic integer or raw pointer type, found `{:?}`",
+            intrinsic, ty
+        ),
+    );
+    // Prevent verifier error
+    crate::trap::trap_unreachable(fx, "compilation should not have succeeded");
 }
 
 pub(crate) fn clif_vector_type<'tcx>(tcx: TyCtxt<'tcx>, layout: TyAndLayout<'tcx>) -> Option<Type> {
@@ -159,12 +96,7 @@ fn simd_for_each_lane<'tcx>(
     fx: &mut FunctionCx<'_, '_, 'tcx>,
     val: CValue<'tcx>,
     ret: CPlace<'tcx>,
-    f: impl Fn(
-        &mut FunctionCx<'_, '_, 'tcx>,
-        TyAndLayout<'tcx>,
-        TyAndLayout<'tcx>,
-        Value,
-    ) -> CValue<'tcx>,
+    f: &dyn Fn(&mut FunctionCx<'_, '_, 'tcx>, Ty<'tcx>, Ty<'tcx>, Value) -> Value,
 ) {
     let layout = val.layout();
 
@@ -177,7 +109,8 @@ fn simd_for_each_lane<'tcx>(
     for lane_idx in 0..lane_count {
         let lane = val.value_lane(fx, lane_idx).load_scalar(fx);
 
-        let res_lane = f(fx, lane_layout, ret_lane_layout, lane);
+        let res_lane = f(fx, lane_layout.ty, ret_lane_layout.ty, lane);
+        let res_lane = CValue::by_val(res_lane, ret_lane_layout);
 
         ret.place_lane(fx, lane_idx).write_cvalue(fx, res_lane);
     }
@@ -188,13 +121,7 @@ fn simd_pair_for_each_lane<'tcx>(
     x: CValue<'tcx>,
     y: CValue<'tcx>,
     ret: CPlace<'tcx>,
-    f: impl Fn(
-        &mut FunctionCx<'_, '_, 'tcx>,
-        TyAndLayout<'tcx>,
-        TyAndLayout<'tcx>,
-        Value,
-        Value,
-    ) -> CValue<'tcx>,
+    f: &dyn Fn(&mut FunctionCx<'_, '_, 'tcx>, Ty<'tcx>, Ty<'tcx>, Value, Value) -> Value,
 ) {
     assert_eq!(x.layout(), y.layout());
     let layout = x.layout();
@@ -209,7 +136,8 @@ fn simd_pair_for_each_lane<'tcx>(
         let x_lane = x.value_lane(fx, lane_idx).load_scalar(fx);
         let y_lane = y.value_lane(fx, lane_idx).load_scalar(fx);
 
-        let res_lane = f(fx, lane_layout, ret_lane_layout, x_lane, y_lane);
+        let res_lane = f(fx, lane_layout.ty, ret_lane_layout.ty, x_lane, y_lane);
+        let res_lane = CValue::by_val(res_lane, ret_lane_layout);
 
         ret.place_lane(fx, lane_idx).write_cvalue(fx, res_lane);
     }
@@ -220,7 +148,7 @@ fn simd_reduce<'tcx>(
     val: CValue<'tcx>,
     acc: Option<Value>,
     ret: CPlace<'tcx>,
-    f: impl Fn(&mut FunctionCx<'_, '_, 'tcx>, TyAndLayout<'tcx>, Value, Value) -> Value,
+    f: &dyn Fn(&mut FunctionCx<'_, '_, 'tcx>, Ty<'tcx>, Value, Value) -> Value,
 ) {
     let (lane_count, lane_ty) = val.layout().ty.simd_size_and_type(fx.tcx);
     let lane_layout = fx.layout_of(lane_ty);
@@ -230,7 +158,7 @@ fn simd_reduce<'tcx>(
         if let Some(acc) = acc { (acc, 0) } else { (val.value_lane(fx, 0).load_scalar(fx), 1) };
     for lane_idx in start_lane..lane_count {
         let lane = val.value_lane(fx, lane_idx).load_scalar(fx);
-        res_val = f(fx, lane_layout, res_val, lane);
+        res_val = f(fx, lane_layout.ty, res_val, lane);
     }
     let res = CValue::by_val(res_val, lane_layout);
     ret.write_cvalue(fx, res);
@@ -241,7 +169,7 @@ fn simd_reduce_bool<'tcx>(
     fx: &mut FunctionCx<'_, '_, 'tcx>,
     val: CValue<'tcx>,
     ret: CPlace<'tcx>,
-    f: impl Fn(&mut FunctionCx<'_, '_, 'tcx>, Value, Value) -> Value,
+    f: &dyn Fn(&mut FunctionCx<'_, '_, 'tcx>, Value, Value) -> Value,
 ) {
     let (lane_count, _lane_ty) = val.layout().ty.simd_size_and_type(fx.tcx);
     assert!(ret.layout().ty.is_bool());
@@ -264,10 +192,10 @@ fn simd_reduce_bool<'tcx>(
 
 fn bool_to_zero_or_max_uint<'tcx>(
     fx: &mut FunctionCx<'_, '_, 'tcx>,
-    layout: TyAndLayout<'tcx>,
+    ty: Ty<'tcx>,
     val: Value,
-) -> CValue<'tcx> {
-    let ty = fx.clif_type(layout.ty).unwrap();
+) -> Value {
+    let ty = fx.clif_type(ty).unwrap();
 
     let int_ty = match ty {
         types::F32 => types::I32,
@@ -282,122 +210,7 @@ fn bool_to_zero_or_max_uint<'tcx>(
         res = fx.bcx.ins().bitcast(ty, res);
     }
 
-    CValue::by_val(res, layout)
-}
-
-macro simd_cmp {
-    ($fx:expr, $cc:ident|$cc_f:ident($x:ident, $y:ident) -> $ret:ident) => {
-        let vector_ty = clif_vector_type($fx.tcx, $x.layout());
-
-        if let Some(vector_ty) = vector_ty {
-            let x = $x.load_scalar($fx);
-            let y = $y.load_scalar($fx);
-            let val = if vector_ty.lane_type().is_float() {
-                $fx.bcx.ins().fcmp(FloatCC::$cc_f, x, y)
-            } else {
-                $fx.bcx.ins().icmp(IntCC::$cc, x, y)
-            };
-
-            // HACK This depends on the fact that icmp for vectors represents bools as 0 and !0, not 0 and 1.
-            let val = $fx.bcx.ins().raw_bitcast(vector_ty, val);
-
-            $ret.write_cvalue($fx, CValue::by_val(val, $ret.layout()));
-        } else {
-            simd_pair_for_each_lane(
-                $fx,
-                $x,
-                $y,
-                $ret,
-                |fx, lane_layout, res_lane_layout, x_lane, y_lane| {
-                    let res_lane = match lane_layout.ty.kind() {
-                        ty::Uint(_) | ty::Int(_) => fx.bcx.ins().icmp(IntCC::$cc, x_lane, y_lane),
-                        ty::Float(_) => fx.bcx.ins().fcmp(FloatCC::$cc_f, x_lane, y_lane),
-                        _ => unreachable!("{:?}", lane_layout.ty),
-                    };
-                    bool_to_zero_or_max_uint(fx, res_lane_layout, res_lane)
-                },
-            );
-        }
-    },
-    ($fx:expr, $cc_u:ident|$cc_s:ident|$cc_f:ident($x:ident, $y:ident) -> $ret:ident) => {
-        // FIXME use vector icmp when possible
-        simd_pair_for_each_lane(
-            $fx,
-            $x,
-            $y,
-            $ret,
-            |fx, lane_layout, res_lane_layout, x_lane, y_lane| {
-                let res_lane = match lane_layout.ty.kind() {
-                    ty::Uint(_) => fx.bcx.ins().icmp(IntCC::$cc_u, x_lane, y_lane),
-                    ty::Int(_) => fx.bcx.ins().icmp(IntCC::$cc_s, x_lane, y_lane),
-                    ty::Float(_) => fx.bcx.ins().fcmp(FloatCC::$cc_f, x_lane, y_lane),
-                    _ => unreachable!("{:?}", lane_layout.ty),
-                };
-                bool_to_zero_or_max_uint(fx, res_lane_layout, res_lane)
-            },
-        );
-    },
-}
-
-macro simd_int_binop {
-    ($fx:expr, $op:ident($x:ident, $y:ident) -> $ret:ident) => {
-        simd_int_binop!($fx, $op|$op($x, $y) -> $ret);
-    },
-    ($fx:expr, $op_u:ident|$op_s:ident($x:ident, $y:ident) -> $ret:ident) => {
-        simd_pair_for_each_lane(
-            $fx,
-            $x,
-            $y,
-            $ret,
-            |fx, lane_layout, ret_lane_layout, x_lane, y_lane| {
-                let res_lane = match lane_layout.ty.kind() {
-                    ty::Uint(_) => fx.bcx.ins().$op_u(x_lane, y_lane),
-                    ty::Int(_) => fx.bcx.ins().$op_s(x_lane, y_lane),
-                    _ => unreachable!("{:?}", lane_layout.ty),
-                };
-                CValue::by_val(res_lane, ret_lane_layout)
-            },
-        );
-    },
-}
-
-macro simd_int_flt_binop {
-    ($fx:expr, $op:ident|$op_f:ident($x:ident, $y:ident) -> $ret:ident) => {
-        simd_int_flt_binop!($fx, $op|$op|$op_f($x, $y) -> $ret);
-    },
-    ($fx:expr, $op_u:ident|$op_s:ident|$op_f:ident($x:ident, $y:ident) -> $ret:ident) => {
-        simd_pair_for_each_lane(
-            $fx,
-            $x,
-            $y,
-            $ret,
-            |fx, lane_layout, ret_lane_layout, x_lane, y_lane| {
-                let res_lane = match lane_layout.ty.kind() {
-                    ty::Uint(_) => fx.bcx.ins().$op_u(x_lane, y_lane),
-                    ty::Int(_) => fx.bcx.ins().$op_s(x_lane, y_lane),
-                    ty::Float(_) => fx.bcx.ins().$op_f(x_lane, y_lane),
-                    _ => unreachable!("{:?}", lane_layout.ty),
-                };
-                CValue::by_val(res_lane, ret_lane_layout)
-            },
-        );
-    },
-}
-
-macro simd_flt_binop($fx:expr, $op:ident($x:ident, $y:ident) -> $ret:ident) {
-    simd_pair_for_each_lane(
-        $fx,
-        $x,
-        $y,
-        $ret,
-        |fx, lane_layout, ret_lane_layout, x_lane, y_lane| {
-            let res_lane = match lane_layout.ty.kind() {
-                ty::Float(_) => fx.bcx.ins().$op(x_lane, y_lane),
-                _ => unreachable!("{:?}", lane_layout.ty),
-            };
-            CValue::by_val(res_lane, ret_lane_layout)
-        },
-    );
+    res
 }
 
 pub(crate) fn codegen_intrinsic_call<'tcx>(
@@ -428,59 +241,111 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
     };
 
     if intrinsic.as_str().starts_with("simd_") {
-        self::simd::codegen_simd_intrinsic_call(fx, instance, args, ret, span);
+        self::simd::codegen_simd_intrinsic_call(fx, intrinsic, substs, args, ret, span);
         let ret_block = fx.get_block(destination.expect("SIMD intrinsics don't diverge").1);
         fx.bcx.ins().jump(ret_block, &[]);
-        return;
+    } else if codegen_float_intrinsic_call(fx, intrinsic, args, ret) {
+        let ret_block = fx.get_block(destination.expect("Float intrinsics don't diverge").1);
+        fx.bcx.ins().jump(ret_block, &[]);
+    } else {
+        codegen_regular_intrinsic_call(
+            fx,
+            instance,
+            intrinsic,
+            substs,
+            args,
+            ret,
+            span,
+            destination,
+        );
+    }
+}
+
+fn codegen_float_intrinsic_call<'tcx>(
+    fx: &mut FunctionCx<'_, '_, 'tcx>,
+    intrinsic: Symbol,
+    args: &[mir::Operand<'tcx>],
+    ret: CPlace<'tcx>,
+) -> bool {
+    let (name, arg_count, ty) = match intrinsic {
+        sym::expf32 => ("expf", 1, fx.tcx.types.f32),
+        sym::expf64 => ("exp", 1, fx.tcx.types.f64),
+        sym::exp2f32 => ("exp2f", 1, fx.tcx.types.f32),
+        sym::exp2f64 => ("exp2", 1, fx.tcx.types.f64),
+        sym::sqrtf32 => ("sqrtf", 1, fx.tcx.types.f32),
+        sym::sqrtf64 => ("sqrt", 1, fx.tcx.types.f64),
+        sym::powif32 => ("__powisf2", 2, fx.tcx.types.f32), // compiler-builtins
+        sym::powif64 => ("__powidf2", 2, fx.tcx.types.f64), // compiler-builtins
+        sym::powf32 => ("powf", 2, fx.tcx.types.f32),
+        sym::powf64 => ("pow", 2, fx.tcx.types.f64),
+        sym::logf32 => ("logf", 1, fx.tcx.types.f32),
+        sym::logf64 => ("log", 1, fx.tcx.types.f64),
+        sym::log2f32 => ("log2f", 1, fx.tcx.types.f32),
+        sym::log2f64 => ("log2", 1, fx.tcx.types.f64),
+        sym::log10f32 => ("log10f", 1, fx.tcx.types.f32),
+        sym::log10f64 => ("log10", 1, fx.tcx.types.f64),
+        sym::fabsf32 => ("fabsf", 1, fx.tcx.types.f32),
+        sym::fabsf64 => ("fabs", 1, fx.tcx.types.f64),
+        sym::fmaf32 => ("fmaf", 3, fx.tcx.types.f32),
+        sym::fmaf64 => ("fma", 3, fx.tcx.types.f64),
+        sym::copysignf32 => ("copysignf", 2, fx.tcx.types.f32),
+        sym::copysignf64 => ("copysign", 2, fx.tcx.types.f64),
+        sym::floorf32 => ("floorf", 1, fx.tcx.types.f32),
+        sym::floorf64 => ("floor", 1, fx.tcx.types.f64),
+        sym::ceilf32 => ("ceilf", 1, fx.tcx.types.f32),
+        sym::ceilf64 => ("ceil", 1, fx.tcx.types.f64),
+        sym::truncf32 => ("truncf", 1, fx.tcx.types.f32),
+        sym::truncf64 => ("trunc", 1, fx.tcx.types.f64),
+        sym::roundf32 => ("roundf", 1, fx.tcx.types.f32),
+        sym::roundf64 => ("round", 1, fx.tcx.types.f64),
+        sym::sinf32 => ("sinf", 1, fx.tcx.types.f32),
+        sym::sinf64 => ("sin", 1, fx.tcx.types.f64),
+        sym::cosf32 => ("cosf", 1, fx.tcx.types.f32),
+        sym::cosf64 => ("cos", 1, fx.tcx.types.f64),
+        _ => return false,
+    };
+
+    if args.len() != arg_count {
+        bug!("wrong number of args for intrinsic {:?}", intrinsic);
     }
 
+    let (a, b, c);
+    let args = match args {
+        [x] => {
+            a = [codegen_operand(fx, x)];
+            &a as &[_]
+        }
+        [x, y] => {
+            b = [codegen_operand(fx, x), codegen_operand(fx, y)];
+            &b
+        }
+        [x, y, z] => {
+            c = [codegen_operand(fx, x), codegen_operand(fx, y), codegen_operand(fx, z)];
+            &c
+        }
+        _ => unreachable!(),
+    };
+
+    let res = fx.easy_call(name, &args, ty);
+    ret.write_cvalue(fx, res);
+
+    true
+}
+
+fn codegen_regular_intrinsic_call<'tcx>(
+    fx: &mut FunctionCx<'_, '_, 'tcx>,
+    instance: Instance<'tcx>,
+    intrinsic: Symbol,
+    substs: SubstsRef<'tcx>,
+    args: &[mir::Operand<'tcx>],
+    ret: CPlace<'tcx>,
+    span: Span,
+    destination: Option<(CPlace<'tcx>, BasicBlock)>,
+) {
     let usize_layout = fx.layout_of(fx.tcx.types.usize);
 
-    call_intrinsic_match! {
-        fx, intrinsic, substs, ret, destination, args,
-        expf32(flt) -> f32 => expf,
-        expf64(flt) -> f64 => exp,
-        exp2f32(flt) -> f32 => exp2f,
-        exp2f64(flt) -> f64 => exp2,
-        sqrtf32(flt) -> f32 => sqrtf,
-        sqrtf64(flt) -> f64 => sqrt,
-        powif32(a, x) -> f32 => __powisf2, // compiler-builtins
-        powif64(a, x) -> f64 => __powidf2, // compiler-builtins
-        powf32(a, x) -> f32 => powf,
-        powf64(a, x) -> f64 => pow,
-        logf32(flt) -> f32 => logf,
-        logf64(flt) -> f64 => log,
-        log2f32(flt) -> f32 => log2f,
-        log2f64(flt) -> f64 => log2,
-        log10f32(flt) -> f32 => log10f,
-        log10f64(flt) -> f64 => log10,
-        fabsf32(flt) -> f32 => fabsf,
-        fabsf64(flt) -> f64 => fabs,
-        fmaf32(x, y, z) -> f32 => fmaf,
-        fmaf64(x, y, z) -> f64 => fma,
-        copysignf32(x, y) -> f32 => copysignf,
-        copysignf64(x, y) -> f64 => copysign,
-
-        // rounding variants
-        // FIXME use clif insts
-        floorf32(flt) -> f32 => floorf,
-        floorf64(flt) -> f64 => floor,
-        ceilf32(flt) -> f32 => ceilf,
-        ceilf64(flt) -> f64 => ceil,
-        truncf32(flt) -> f32 => truncf,
-        truncf64(flt) -> f64 => trunc,
-        roundf32(flt) -> f32 => roundf,
-        roundf64(flt) -> f64 => round,
-
-        // trigonometry
-        sinf32(flt) -> f32 => sinf,
-        sinf64(flt) -> f64 => sin,
-        cosf32(flt) -> f32 => cosf,
-        cosf64(flt) -> f64 => cos,
-    }
-
     intrinsic_match! {
-        fx, intrinsic, substs, args,
+        fx, intrinsic, args,
         _ => {
             fx.tcx.sess.span_fatal(span, &format!("unsupported intrinsic {}", intrinsic));
         };
@@ -492,7 +357,8 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         breakpoint, () {
             fx.bcx.ins().debugtrap();
         };
-        copy | copy_nonoverlapping, <elem_ty> (v src, v dst, v count) {
+        copy | copy_nonoverlapping, (v src, v dst, v count) {
+            let elem_ty = substs.type_at(0);
             let elem_size: u64 = fx.layout_of(elem_ty).size.bytes();
             assert_eq!(args.len(), 3);
             let byte_amount = if elem_size != 1 {
@@ -510,7 +376,8 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             }
         };
         // NOTE: the volatile variants have src and dst swapped
-        volatile_copy_memory | volatile_copy_nonoverlapping_memory, <elem_ty> (v dst, v src, v count) {
+        volatile_copy_memory | volatile_copy_nonoverlapping_memory, (v dst, v src, v count) {
+            let elem_ty = substs.type_at(0);
             let elem_size: u64 = fx.layout_of(elem_ty).size.bytes();
             assert_eq!(args.len(), 3);
             let byte_amount = if elem_size != 1 {
@@ -528,8 +395,8 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
                 fx.bcx.call_memmove(fx.target_config, dst, src, byte_amount);
             }
         };
-        size_of_val, <T> (c ptr) {
-            let layout = fx.layout_of(T);
+        size_of_val, (c ptr) {
+            let layout = fx.layout_of(substs.type_at(0));
             let size = if layout.is_unsized() {
                 let (_ptr, info) = ptr.load_scalar_pair(fx);
                 let (size, _align) = crate::unsize::size_and_align_of_dst(fx, layout, info);
@@ -542,8 +409,8 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             };
             ret.write_cvalue(fx, CValue::by_val(size, usize_layout));
         };
-        min_align_of_val, <T> (c ptr) {
-            let layout = fx.layout_of(T);
+        min_align_of_val, (c ptr) {
+            let layout = fx.layout_of(substs.type_at(0));
             let align = if layout.is_unsized() {
                 let (_ptr, info) = ptr.load_scalar_pair(fx);
                 let (_size, align) = crate::unsize::size_and_align_of_dst(fx, layout, info);
@@ -557,12 +424,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             ret.write_cvalue(fx, CValue::by_val(align, usize_layout));
         };
 
-        unchecked_add | unchecked_sub | unchecked_div | exact_div | unchecked_rem
+        unchecked_add | unchecked_sub | unchecked_mul | unchecked_div | exact_div | unchecked_rem
         | unchecked_shl | unchecked_shr, (c x, c y) {
             // FIXME trap on overflow
             let bin_op = match intrinsic {
                 sym::unchecked_add => BinOp::Add,
                 sym::unchecked_sub => BinOp::Sub,
+                sym::unchecked_mul => BinOp::Mul,
                 sym::unchecked_div | sym::exact_div => BinOp::Div,
                 sym::unchecked_rem => BinOp::Rem,
                 sym::unchecked_shl => BinOp::Shl,
@@ -589,7 +457,7 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             );
             ret.write_cvalue(fx, res);
         };
-        saturating_add | saturating_sub, <T> (c lhs, c rhs) {
+        saturating_add | saturating_sub, (c lhs, c rhs) {
             assert_eq!(lhs.layout().ty, rhs.layout().ty);
             let bin_op = match intrinsic {
                 sym::saturating_add => BinOp::Add,
@@ -597,7 +465,7 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
                 _ => unreachable!(),
             };
 
-            let signed = type_sign(T);
+            let signed = type_sign(lhs.layout().ty);
 
             let checked_res = crate::num::codegen_checked_int_binop(
                 fx,
@@ -607,7 +475,7 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             );
 
             let (val, has_overflow) = checked_res.load_scalar_pair(fx);
-            let clif_ty = fx.clif_type(T).unwrap();
+            let clif_ty = fx.clif_type(lhs.layout().ty).unwrap();
 
             let (min, max) = type_min_max_value(&mut fx.bcx, clif_ty, signed);
 
@@ -629,17 +497,19 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
                 _ => unreachable!(),
             };
 
-            let res = CValue::by_val(val, fx.layout_of(T));
+            let res = CValue::by_val(val, lhs.layout());
 
             ret.write_cvalue(fx, res);
         };
-        rotate_left, <T>(v x, v y) {
-            let layout = fx.layout_of(T);
+        rotate_left, (c x, v y) {
+            let layout = x.layout();
+            let x = x.load_scalar(fx);
             let res = fx.bcx.ins().rotl(x, y);
             ret.write_cvalue(fx, CValue::by_val(res, layout));
         };
-        rotate_right, <T>(v x, v y) {
-            let layout = fx.layout_of(T);
+        rotate_right, (c x, v y) {
+            let layout = x.layout();
+            let x = x.load_scalar(fx);
             let res = fx.bcx.ins().rotr(x, y);
             ret.write_cvalue(fx, CValue::by_val(res, layout));
         };
@@ -675,29 +545,33 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             // FIXME use emit_small_memset
             fx.bcx.call_memset(fx.target_config, dst_ptr, val, count);
         };
-        ctlz | ctlz_nonzero, <T> (v arg) {
+        ctlz | ctlz_nonzero, (c arg) {
+            let val = arg.load_scalar(fx);
             // FIXME trap on `ctlz_nonzero` with zero arg.
-            let res = fx.bcx.ins().clz(arg);
-            let res = CValue::by_val(res, fx.layout_of(T));
+            let res = fx.bcx.ins().clz(val);
+            let res = CValue::by_val(res, arg.layout());
             ret.write_cvalue(fx, res);
         };
-        cttz | cttz_nonzero, <T> (v arg) {
+        cttz | cttz_nonzero, (c arg) {
+            let val = arg.load_scalar(fx);
             // FIXME trap on `cttz_nonzero` with zero arg.
-            let res = fx.bcx.ins().ctz(arg);
-            let res = CValue::by_val(res, fx.layout_of(T));
+            let res = fx.bcx.ins().ctz(val);
+            let res = CValue::by_val(res, arg.layout());
             ret.write_cvalue(fx, res);
         };
-        ctpop, <T> (v arg) {
-            let res = fx.bcx.ins().popcnt(arg);
-            let res = CValue::by_val(res, fx.layout_of(T));
+        ctpop, (c arg) {
+            let val = arg.load_scalar(fx);
+            let res = fx.bcx.ins().popcnt(val);
+            let res = CValue::by_val(res, arg.layout());
             ret.write_cvalue(fx, res);
         };
-        bitreverse, <T> (v arg) {
-            let res = fx.bcx.ins().bitrev(arg);
-            let res = CValue::by_val(res, fx.layout_of(T));
+        bitreverse, (c arg) {
+            let val = arg.load_scalar(fx);
+            let res = fx.bcx.ins().bitrev(val);
+            let res = CValue::by_val(res, arg.layout());
             ret.write_cvalue(fx, res);
         };
-        bswap, <T> (v arg) {
+        bswap, (c arg) {
             // FIXME(CraneStation/cranelift#794) add bswap instruction to cranelift
             fn swap(bcx: &mut FunctionBuilder<'_>, v: Value) -> Value {
                 match bcx.func.dfg.value_type(v) {
@@ -773,16 +647,17 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
                     ty => unreachable!("bswap {}", ty),
                 }
             }
-            let res = CValue::by_val(swap(&mut fx.bcx, arg), fx.layout_of(T));
+            let val = arg.load_scalar(fx);
+            let res = CValue::by_val(swap(&mut fx.bcx, val), arg.layout());
             ret.write_cvalue(fx, res);
         };
-        assert_inhabited | assert_zero_valid | assert_uninit_valid, <T> () {
-            let layout = fx.layout_of(T);
+        assert_inhabited | assert_zero_valid | assert_uninit_valid, () {
+            let layout = fx.layout_of(substs.type_at(0));
             if layout.abi.is_uninhabited() {
                 with_no_trimmed_paths!({
                     crate::base::codegen_panic(
                         fx,
-                        &format!("attempted to instantiate uninhabited type `{}`", T),
+                        &format!("attempted to instantiate uninhabited type `{}`", layout.ty),
                         span,
                     )
                 });
@@ -793,7 +668,7 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
                 with_no_trimmed_paths!({
                     crate::base::codegen_panic(
                         fx,
-                        &format!("attempted to zero-initialize type `{}`, which is invalid", T),
+                        &format!("attempted to zero-initialize type `{}`, which is invalid", layout.ty),
                         span,
                     );
                 });
@@ -804,7 +679,7 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
                 with_no_trimmed_paths!({
                     crate::base::codegen_panic(
                         fx,
-                        &format!("attempted to leave type `{}` uninitialized, which is invalid", T),
+                        &format!("attempted to leave type `{}` uninitialized, which is invalid", layout.ty),
                         span,
                     )
                 });
@@ -838,10 +713,11 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             ret.write_cvalue(fx, val);
         };
 
-        ptr_offset_from, <T> (v ptr, v base) {
+        ptr_offset_from, (v ptr, v base) {
+            let ty = substs.type_at(0);
             let isize_layout = fx.layout_of(fx.tcx.types.isize);
 
-            let pointee_size: u64 = fx.layout_of(T).size.bytes();
+            let pointee_size: u64 = fx.layout_of(ty).size.bytes();
             let diff = fx.bcx.ins().isub(ptr, base);
             // FIXME this can be an exact division.
             let val = CValue::by_val(fx.bcx.ins().sdiv_imm(diff, pointee_size as i64), isize_layout);
@@ -870,17 +746,31 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             // FIXME use a compiler fence once Cranelift supports it
             fx.bcx.ins().fence();
         };
-        _ if intrinsic.as_str().starts_with("atomic_load"), <T> (v ptr) {
-            validate_atomic_type!(fx, intrinsic, span, T);
-            let ty = fx.clif_type(T).unwrap();
+        _ if intrinsic.as_str().starts_with("atomic_load"), (v ptr) {
+            let ty = substs.type_at(0);
+            match ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, ty);
+                    return;
+                }
+            }
+            let clif_ty = fx.clif_type(ty).unwrap();
 
-            let val = fx.bcx.ins().atomic_load(ty, MemFlags::trusted(), ptr);
+            let val = fx.bcx.ins().atomic_load(clif_ty, MemFlags::trusted(), ptr);
 
-            let val = CValue::by_val(val, fx.layout_of(T));
+            let val = CValue::by_val(val, fx.layout_of(ty));
             ret.write_cvalue(fx, val);
         };
         _ if intrinsic.as_str().starts_with("atomic_store"), (v ptr, c val) {
-            validate_atomic_type!(fx, intrinsic, span, val.layout().ty);
+            let ty = substs.type_at(0);
+            match ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, ty);
+                    return;
+                }
+            }
 
             let val = val.load_scalar(fx);
 
@@ -888,7 +778,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_xchg"), (v ptr, c new) {
             let layout = new.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let new = new.load_scalar(fx);
@@ -900,7 +796,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_cxchg"), (v ptr, c test_old, c new) { // both atomic_cxchg_* and atomic_cxchgweak_*
             let layout = new.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
 
             let test_old = test_old.load_scalar(fx);
             let new = new.load_scalar(fx);
@@ -914,7 +816,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
 
         _ if intrinsic.as_str().starts_with("atomic_xadd"), (v ptr, c amount) {
             let layout = amount.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let amount = amount.load_scalar(fx);
@@ -926,7 +834,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_xsub"), (v ptr, c amount) {
             let layout = amount.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let amount = amount.load_scalar(fx);
@@ -938,7 +852,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_and"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -950,7 +870,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_or"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -962,7 +888,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_xor"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -974,7 +906,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_nand"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -986,7 +924,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_max"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -998,7 +942,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_umax"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -1010,7 +960,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_min"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -1022,7 +978,13 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
         };
         _ if intrinsic.as_str().starts_with("atomic_umin"), (v ptr, c src) {
             let layout = src.layout();
-            validate_atomic_type!(fx, intrinsic, span, layout.ty);
+            match layout.ty.kind() {
+                ty::Uint(_) | ty::Int(_) | ty::RawPtr(..) => {}
+                _ => {
+                    report_atomic_type_validation_error(fx, intrinsic, span, layout.ty);
+                    return;
+                }
+            }
             let ty = fx.clif_type(layout.ty).unwrap();
 
             let src = src.load_scalar(fx);
@@ -1107,18 +1069,14 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             ret.write_cvalue(fx, CValue::by_val(res, ret.layout()));
         };
 
-        raw_eq, <T>(v lhs_ref, v rhs_ref) {
-            fn type_by_size(size: Size) -> Option<Type> {
-                Type::int(size.bits().try_into().ok()?)
-            }
-
-            let size = fx.layout_of(T).layout.size;
+        raw_eq, (v lhs_ref, v rhs_ref) {
+            let size = fx.layout_of(substs.type_at(0)).layout.size;
             // FIXME add and use emit_small_memcmp
             let is_eq_value =
                 if size == Size::ZERO {
                     // No bytes means they're trivially equal
                     fx.bcx.ins().iconst(types::I8, 1)
-                } else if let Some(clty) = type_by_size(size) {
+                } else if let Some(clty) = size.bits().try_into().ok().and_then(Type::int) {
                     // Can't use `trusted` for these loads; they could be unaligned.
                     let mut flags = MemFlags::new();
                     flags.set_notrap();
@@ -1141,6 +1099,16 @@ pub(crate) fn codegen_intrinsic_call<'tcx>(
             ret.write_cvalue(fx, CValue::by_val(is_eq_value, ret.layout()));
         };
 
+        const_allocate, (c _size, c _align) {
+            // returns a null pointer at runtime.
+            let null = fx.bcx.ins().iconst(fx.pointer_type, 0);
+            ret.write_cvalue(fx, CValue::by_val(null, ret.layout()));
+        };
+
+        const_deallocate, (c _ptr, c _size, c _align) {
+            // nop at runtime.
+        };
+
         black_box, (c a) {
             // FIXME implement black_box semantics
             ret.write_cvalue(fx, a);
diff --git a/src/intrinsics/simd.rs b/src/intrinsics/simd.rs
index 6c0631d9ecb..4153bc08e8a 100644
--- a/src/intrinsics/simd.rs
+++ b/src/intrinsics/simd.rs
@@ -1,71 +1,116 @@
 //! Codegen `extern "platform-intrinsic"` intrinsics.
 
+use rustc_middle::ty::subst::SubstsRef;
+use rustc_span::Symbol;
+
 use super::*;
 use crate::prelude::*;
 
+fn report_simd_type_validation_error(
+    fx: &mut FunctionCx<'_, '_, '_>,
+    intrinsic: Symbol,
+    span: Span,
+    ty: Ty<'_>,
+) {
+    fx.tcx.sess.span_err(span, &format!("invalid monomorphization of `{}` intrinsic: expected SIMD input type, found non-SIMD `{}`", intrinsic, ty));
+    // Prevent verifier error
+    crate::trap::trap_unreachable(fx, "compilation should not have succeeded");
+}
+
 pub(super) fn codegen_simd_intrinsic_call<'tcx>(
     fx: &mut FunctionCx<'_, '_, 'tcx>,
-    instance: Instance<'tcx>,
+    intrinsic: Symbol,
+    _substs: SubstsRef<'tcx>,
     args: &[mir::Operand<'tcx>],
     ret: CPlace<'tcx>,
     span: Span,
 ) {
-    let def_id = instance.def_id();
-    let substs = instance.substs;
-
-    let intrinsic = fx.tcx.item_name(def_id);
-
     intrinsic_match! {
-        fx, intrinsic, substs, args,
+        fx, intrinsic, args,
         _ => {
             fx.tcx.sess.span_fatal(span, &format!("Unknown SIMD intrinsic {}", intrinsic));
         };
 
         simd_cast, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, lane_layout, ret_lane_layout, lane| {
-                let ret_lane_ty = fx.clif_type(ret_lane_layout.ty).unwrap();
+            if !a.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
+                return;
+            }
 
-                let from_signed = type_sign(lane_layout.ty);
-                let to_signed = type_sign(ret_lane_layout.ty);
+            simd_for_each_lane(fx, a, ret, &|fx, lane_ty, ret_lane_ty, lane| {
+                let ret_lane_clif_ty = fx.clif_type(ret_lane_ty).unwrap();
 
-                let ret_lane = clif_int_or_float_cast(fx, lane, from_signed, ret_lane_ty, to_signed);
-                CValue::by_val(ret_lane, ret_lane_layout)
+                let from_signed = type_sign(lane_ty);
+                let to_signed = type_sign(ret_lane_ty);
+
+                clif_int_or_float_cast(fx, lane, from_signed, ret_lane_clif_ty, to_signed)
             });
         };
 
-        simd_eq, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_cmp!(fx, Equal|Equal(x, y) -> ret);
-        };
-        simd_ne, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_cmp!(fx, NotEqual|NotEqual(x, y) -> ret);
-        };
-        simd_lt, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_cmp!(fx, UnsignedLessThan|SignedLessThan|LessThan(x, y) -> ret);
-        };
-        simd_le, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_cmp!(fx, UnsignedLessThanOrEqual|SignedLessThanOrEqual|LessThanOrEqual(x, y) -> ret);
-        };
-        simd_gt, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_cmp!(fx, UnsignedGreaterThan|SignedGreaterThan|GreaterThan(x, y) -> ret);
-        };
-        simd_ge, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_cmp!(
-                fx,
-                UnsignedGreaterThanOrEqual|SignedGreaterThanOrEqual|GreaterThanOrEqual
-                (x, y) -> ret
-            );
+        simd_eq | simd_ne | simd_lt | simd_le | simd_gt | simd_ge, (c x, c y) {
+            if !x.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, x.layout().ty);
+                return;
+            }
+
+            // FIXME use vector instructions when possible
+            simd_pair_for_each_lane(fx, x, y, ret, &|fx, lane_ty, res_lane_ty, x_lane, y_lane| {
+                let res_lane = match (lane_ty.kind(), intrinsic) {
+                    (ty::Uint(_), sym::simd_eq) => fx.bcx.ins().icmp(IntCC::Equal, x_lane, y_lane),
+                    (ty::Uint(_), sym::simd_ne) => fx.bcx.ins().icmp(IntCC::NotEqual, x_lane, y_lane),
+                    (ty::Uint(_), sym::simd_lt) => {
+                        fx.bcx.ins().icmp(IntCC::UnsignedLessThan, x_lane, y_lane)
+                    }
+                    (ty::Uint(_), sym::simd_le) => {
+                        fx.bcx.ins().icmp(IntCC::UnsignedLessThanOrEqual, x_lane, y_lane)
+                    }
+                    (ty::Uint(_), sym::simd_gt) => {
+                        fx.bcx.ins().icmp(IntCC::UnsignedGreaterThan, x_lane, y_lane)
+                    }
+                    (ty::Uint(_), sym::simd_ge) => {
+                        fx.bcx.ins().icmp(IntCC::UnsignedGreaterThanOrEqual, x_lane, y_lane)
+                    }
+
+                    (ty::Int(_), sym::simd_eq) => fx.bcx.ins().icmp(IntCC::Equal, x_lane, y_lane),
+                    (ty::Int(_), sym::simd_ne) => fx.bcx.ins().icmp(IntCC::NotEqual, x_lane, y_lane),
+                    (ty::Int(_), sym::simd_lt) => fx.bcx.ins().icmp(IntCC::SignedLessThan, x_lane, y_lane),
+                    (ty::Int(_), sym::simd_le) => {
+                        fx.bcx.ins().icmp(IntCC::SignedLessThanOrEqual, x_lane, y_lane)
+                    }
+                    (ty::Int(_), sym::simd_gt) => {
+                        fx.bcx.ins().icmp(IntCC::SignedGreaterThan, x_lane, y_lane)
+                    }
+                    (ty::Int(_), sym::simd_ge) => {
+                        fx.bcx.ins().icmp(IntCC::SignedGreaterThanOrEqual, x_lane, y_lane)
+                    }
+
+                    (ty::Float(_), sym::simd_eq) => fx.bcx.ins().fcmp(FloatCC::Equal, x_lane, y_lane),
+                    (ty::Float(_), sym::simd_ne) => fx.bcx.ins().fcmp(FloatCC::NotEqual, x_lane, y_lane),
+                    (ty::Float(_), sym::simd_lt) => fx.bcx.ins().fcmp(FloatCC::LessThan, x_lane, y_lane),
+                    (ty::Float(_), sym::simd_le) => {
+                        fx.bcx.ins().fcmp(FloatCC::LessThanOrEqual, x_lane, y_lane)
+                    }
+                    (ty::Float(_), sym::simd_gt) => fx.bcx.ins().fcmp(FloatCC::GreaterThan, x_lane, y_lane),
+                    (ty::Float(_), sym::simd_ge) => {
+                        fx.bcx.ins().fcmp(FloatCC::GreaterThanOrEqual, x_lane, y_lane)
+                    }
+
+                    _ => unreachable!(),
+                };
+
+                let ty = fx.clif_type(res_lane_ty).unwrap();
+
+                let res_lane = fx.bcx.ins().bint(ty, res_lane);
+                fx.bcx.ins().ineg(res_lane)
+            });
         };
 
         // simd_shuffle32<T, U>(x: T, y: T, idx: [u32; 32]) -> U
         _ if intrinsic.as_str().starts_with("simd_shuffle"), (c x, c y, o idx) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
+            if !x.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, x.layout().ty);
+                return;
+            }
 
             // If this intrinsic is the older "simd_shuffleN" form, simply parse the integer.
             // If there is no suffix, use the index array length.
@@ -167,7 +212,11 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         };
 
         simd_extract, (c v, o idx) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
             let idx_const = if let Some(idx_const) = crate::constant::mir_operand_get_const_val(fx, idx) {
                 idx_const
             } else {
@@ -195,95 +244,82 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         };
 
         simd_neg, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, lane_layout, ret_lane_layout, lane| {
-                let ret_lane = match lane_layout.ty.kind() {
+            if !a.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
+                return;
+            }
+
+            simd_for_each_lane(fx, a, ret, &|fx, lane_ty, _ret_lane_ty, lane| {
+                match lane_ty.kind() {
                     ty::Int(_) => fx.bcx.ins().ineg(lane),
                     ty::Float(_) => fx.bcx.ins().fneg(lane),
                     _ => unreachable!(),
-                };
-                CValue::by_val(ret_lane, ret_lane_layout)
+                }
             });
         };
 
-        simd_fabs, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, _lane_layout, ret_lane_layout, lane| {
-                let ret_lane = fx.bcx.ins().fabs(lane);
-                CValue::by_val(ret_lane, ret_lane_layout)
-            });
-        };
+        simd_add | simd_sub | simd_mul | simd_div | simd_rem
+        | simd_shl | simd_shr | simd_and | simd_or | simd_xor, (c x, c y) {
+            if !x.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, x.layout().ty);
+                return;
+            }
 
-        simd_fsqrt, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, _lane_layout, ret_lane_layout, lane| {
-                let ret_lane = fx.bcx.ins().sqrt(lane);
-                CValue::by_val(ret_lane, ret_lane_layout)
-            });
-        };
+            // FIXME use vector instructions when possible
+            simd_pair_for_each_lane(fx, x, y, ret, &|fx, lane_ty, _ret_lane_ty, x_lane, y_lane| match (
+                lane_ty.kind(),
+                intrinsic,
+            ) {
+                (ty::Uint(_), sym::simd_add) => fx.bcx.ins().iadd(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_sub) => fx.bcx.ins().isub(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_mul) => fx.bcx.ins().imul(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_div) => fx.bcx.ins().udiv(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_rem) => fx.bcx.ins().urem(x_lane, y_lane),
 
-        simd_add, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_flt_binop!(fx, iadd|fadd(x, y) -> ret);
-        };
-        simd_sub, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_flt_binop!(fx, isub|fsub(x, y) -> ret);
-        };
-        simd_mul, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_flt_binop!(fx, imul|fmul(x, y) -> ret);
-        };
-        simd_div, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_flt_binop!(fx, udiv|sdiv|fdiv(x, y) -> ret);
-        };
-        simd_rem, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_pair_for_each_lane(fx, x, y, ret, |fx, lane_layout, ret_lane_layout, x_lane, y_lane| {
-                let res_lane = match lane_layout.ty.kind() {
-                    ty::Uint(_) => fx.bcx.ins().urem(x_lane, y_lane),
-                    ty::Int(_) => fx.bcx.ins().srem(x_lane, y_lane),
-                    ty::Float(FloatTy::F32) => fx.lib_call(
-                        "fmodf",
-                        vec![AbiParam::new(types::F32), AbiParam::new(types::F32)],
-                        vec![AbiParam::new(types::F32)],
-                        &[x_lane, y_lane],
-                    )[0],
-                    ty::Float(FloatTy::F64) => fx.lib_call(
-                        "fmod",
-                        vec![AbiParam::new(types::F64), AbiParam::new(types::F64)],
-                        vec![AbiParam::new(types::F64)],
-                        &[x_lane, y_lane],
-                    )[0],
-                    _ => unreachable!("{:?}", lane_layout.ty),
-                };
-                CValue::by_val(res_lane, ret_lane_layout)
+                (ty::Int(_), sym::simd_add) => fx.bcx.ins().iadd(x_lane, y_lane),
+                (ty::Int(_), sym::simd_sub) => fx.bcx.ins().isub(x_lane, y_lane),
+                (ty::Int(_), sym::simd_mul) => fx.bcx.ins().imul(x_lane, y_lane),
+                (ty::Int(_), sym::simd_div) => fx.bcx.ins().sdiv(x_lane, y_lane),
+                (ty::Int(_), sym::simd_rem) => fx.bcx.ins().srem(x_lane, y_lane),
+
+                (ty::Float(_), sym::simd_add) => fx.bcx.ins().fadd(x_lane, y_lane),
+                (ty::Float(_), sym::simd_sub) => fx.bcx.ins().fsub(x_lane, y_lane),
+                (ty::Float(_), sym::simd_mul) => fx.bcx.ins().fmul(x_lane, y_lane),
+                (ty::Float(_), sym::simd_div) => fx.bcx.ins().fdiv(x_lane, y_lane),
+                (ty::Float(FloatTy::F32), sym::simd_rem) => fx.lib_call(
+                    "fmodf",
+                    vec![AbiParam::new(types::F32), AbiParam::new(types::F32)],
+                    vec![AbiParam::new(types::F32)],
+                    &[x_lane, y_lane],
+                )[0],
+                (ty::Float(FloatTy::F64), sym::simd_rem) => fx.lib_call(
+                    "fmod",
+                    vec![AbiParam::new(types::F64), AbiParam::new(types::F64)],
+                    vec![AbiParam::new(types::F64)],
+                    &[x_lane, y_lane],
+                )[0],
+
+                (ty::Uint(_), sym::simd_shl) => fx.bcx.ins().ishl(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_shr) => fx.bcx.ins().ushr(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_and) => fx.bcx.ins().band(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_or) => fx.bcx.ins().bor(x_lane, y_lane),
+                (ty::Uint(_), sym::simd_xor) => fx.bcx.ins().bxor(x_lane, y_lane),
+
+                (ty::Int(_), sym::simd_shl) => fx.bcx.ins().ishl(x_lane, y_lane),
+                (ty::Int(_), sym::simd_shr) => fx.bcx.ins().sshr(x_lane, y_lane),
+                (ty::Int(_), sym::simd_and) => fx.bcx.ins().band(x_lane, y_lane),
+                (ty::Int(_), sym::simd_or) => fx.bcx.ins().bor(x_lane, y_lane),
+                (ty::Int(_), sym::simd_xor) => fx.bcx.ins().bxor(x_lane, y_lane),
+
+                _ => unreachable!(),
             });
         };
-        simd_shl, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_binop!(fx, ishl(x, y) -> ret);
-        };
-        simd_shr, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_binop!(fx, ushr|sshr(x, y) -> ret);
-        };
-        simd_and, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_binop!(fx, band(x, y) -> ret);
-        };
-        simd_or, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_binop!(fx, bor(x, y) -> ret);
-        };
-        simd_xor, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_int_binop!(fx, bxor(x, y) -> ret);
-        };
 
         simd_fma, (c a, c b, c c) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
+            if !a.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
+                return;
+            }
             assert_eq!(a.layout(), b.layout());
             assert_eq!(a.layout(), c.layout());
             let layout = a.layout();
@@ -305,19 +341,34 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
             }
         };
 
-        simd_fmin, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_flt_binop!(fx, fmin(x, y) -> ret);
-        };
-        simd_fmax, (c x, c y) {
-            validate_simd_type!(fx, intrinsic, span, x.layout().ty);
-            simd_flt_binop!(fx, fmax(x, y) -> ret);
+        simd_fmin | simd_fmax, (c x, c y) {
+            if !x.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, x.layout().ty);
+                return;
+            }
+
+            // FIXME use vector instructions when possible
+            simd_pair_for_each_lane(fx, x, y, ret, &|fx, lane_ty, _ret_lane_ty, x_lane, y_lane| {
+                match lane_ty.kind() {
+                    ty::Float(_) => {},
+                    _ => unreachable!("{:?}", lane_ty),
+                }
+                match intrinsic {
+                    sym::simd_fmin => fx.bcx.ins().fmin(x_lane, y_lane),
+                    sym::simd_fmax => fx.bcx.ins().fmax(x_lane, y_lane),
+                    _ => unreachable!(),
+                }
+            });
         };
 
         simd_round, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, lane_layout, ret_lane_layout, lane| {
-                let res_lane = match lane_layout.ty.kind() {
+            if !a.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
+                return;
+            }
+
+            simd_for_each_lane(fx, a, ret, &|fx, lane_ty, _ret_lane_ty, lane| {
+                match lane_ty.kind() {
                     ty::Float(FloatTy::F32) => fx.lib_call(
                         "roundf",
                         vec![AbiParam::new(types::F32)],
@@ -330,37 +381,41 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                         vec![AbiParam::new(types::F64)],
                         &[lane],
                     )[0],
-                    _ => unreachable!("{:?}", lane_layout.ty),
-                };
-                CValue::by_val(res_lane, ret_lane_layout)
+                    _ => unreachable!("{:?}", lane_ty),
+                }
             });
         };
-        simd_ceil, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, _lane_layout, ret_lane_layout, lane| {
-                let ret_lane = fx.bcx.ins().ceil(lane);
-                CValue::by_val(ret_lane, ret_lane_layout)
-            });
-        };
-        simd_floor, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, _lane_layout, ret_lane_layout, lane| {
-                let ret_lane = fx.bcx.ins().floor(lane);
-                CValue::by_val(ret_lane, ret_lane_layout)
-            });
-        };
-        simd_trunc, (c a) {
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
-            simd_for_each_lane(fx, a, ret, |fx, _lane_layout, ret_lane_layout, lane| {
-                let ret_lane = fx.bcx.ins().trunc(lane);
-                CValue::by_val(ret_lane, ret_lane_layout)
+
+        simd_fabs | simd_fsqrt | simd_ceil | simd_floor | simd_trunc, (c a) {
+            if !a.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
+                return;
+            }
+
+            simd_for_each_lane(fx, a, ret, &|fx, lane_ty, _ret_lane_ty, lane| {
+                match lane_ty.kind() {
+                    ty::Float(_) => {},
+                    _ => unreachable!("{:?}", lane_ty),
+                }
+                match intrinsic {
+                    sym::simd_fabs => fx.bcx.ins().fabs(lane),
+                    sym::simd_fsqrt => fx.bcx.ins().sqrt(lane),
+                    sym::simd_ceil => fx.bcx.ins().ceil(lane),
+                    sym::simd_floor => fx.bcx.ins().floor(lane),
+                    sym::simd_trunc => fx.bcx.ins().trunc(lane),
+                    _ => unreachable!(),
+                }
             });
         };
 
         simd_reduce_add_ordered | simd_reduce_add_unordered, (c v, v acc) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce(fx, v, Some(acc), ret, |fx, lane_layout, a, b| {
-                if lane_layout.ty.is_floating_point() {
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce(fx, v, Some(acc), ret, &|fx, lane_ty, a, b| {
+                if lane_ty.is_floating_point() {
                     fx.bcx.ins().fadd(a, b)
                 } else {
                     fx.bcx.ins().iadd(a, b)
@@ -369,9 +424,13 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         };
 
         simd_reduce_mul_ordered | simd_reduce_mul_unordered, (c v, v acc) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce(fx, v, Some(acc), ret, |fx, lane_layout, a, b| {
-                if lane_layout.ty.is_floating_point() {
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce(fx, v, Some(acc), ret, &|fx, lane_ty, a, b| {
+                if lane_ty.is_floating_point() {
                     fx.bcx.ins().fmul(a, b)
                 } else {
                     fx.bcx.ins().imul(a, b)
@@ -380,34 +439,58 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         };
 
         simd_reduce_all, (c v) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce_bool(fx, v, ret, |fx, a, b| fx.bcx.ins().band(a, b));
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce_bool(fx, v, ret, &|fx, a, b| fx.bcx.ins().band(a, b));
         };
 
         simd_reduce_any, (c v) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce_bool(fx, v, ret, |fx, a, b| fx.bcx.ins().bor(a, b));
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce_bool(fx, v, ret, &|fx, a, b| fx.bcx.ins().bor(a, b));
         };
 
         simd_reduce_and, (c v) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce(fx, v, None, ret, |fx, _layout, a, b| fx.bcx.ins().band(a, b));
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce(fx, v, None, ret, &|fx, _ty, a, b| fx.bcx.ins().band(a, b));
         };
 
         simd_reduce_or, (c v) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce(fx, v, None, ret, |fx, _layout, a, b| fx.bcx.ins().bor(a, b));
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce(fx, v, None, ret, &|fx, _ty, a, b| fx.bcx.ins().bor(a, b));
         };
 
         simd_reduce_xor, (c v) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce(fx, v, None, ret, |fx, _layout, a, b| fx.bcx.ins().bxor(a, b));
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce(fx, v, None, ret, &|fx, _ty, a, b| fx.bcx.ins().bxor(a, b));
         };
 
         simd_reduce_min, (c v) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce(fx, v, None, ret, |fx, layout, a, b| {
-                let lt = match layout.ty.kind() {
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce(fx, v, None, ret, &|fx, ty, a, b| {
+                let lt = match ty.kind() {
                     ty::Int(_) => fx.bcx.ins().icmp(IntCC::SignedLessThan, a, b),
                     ty::Uint(_) => fx.bcx.ins().icmp(IntCC::UnsignedLessThan, a, b),
                     ty::Float(_) => fx.bcx.ins().fcmp(FloatCC::LessThan, a, b),
@@ -418,9 +501,13 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         };
 
         simd_reduce_max, (c v) {
-            validate_simd_type!(fx, intrinsic, span, v.layout().ty);
-            simd_reduce(fx, v, None, ret, |fx, layout, a, b| {
-                let gt = match layout.ty.kind() {
+            if !v.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
+                return;
+            }
+
+            simd_reduce(fx, v, None, ret, &|fx, ty, a, b| {
+                let gt = match ty.kind() {
                     ty::Int(_) => fx.bcx.ins().icmp(IntCC::SignedGreaterThan, a, b),
                     ty::Uint(_) => fx.bcx.ins().icmp(IntCC::UnsignedGreaterThan, a, b),
                     ty::Float(_) => fx.bcx.ins().fcmp(FloatCC::GreaterThan, a, b),
@@ -431,8 +518,14 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
         };
 
         simd_select, (c m, c a, c b) {
-            validate_simd_type!(fx, intrinsic, span, m.layout().ty);
-            validate_simd_type!(fx, intrinsic, span, a.layout().ty);
+            if !m.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, m.layout().ty);
+                return;
+            }
+            if !a.layout().ty.is_simd() {
+                report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
+                return;
+            }
             assert_eq!(a.layout(), b.layout());
 
             let (lane_count, lane_ty) = a.layout().ty.simd_size_and_type(fx.tcx);
diff --git a/src/main_shim.rs b/src/main_shim.rs
index 8fd1e4f5811..9ce727279c2 100644
--- a/src/main_shim.rs
+++ b/src/main_shim.rs
@@ -1,4 +1,3 @@
-use cranelift_codegen::binemit::{NullStackMapSink, NullTrapSink};
 use rustc_hir::LangItem;
 use rustc_middle::ty::subst::GenericArg;
 use rustc_middle::ty::AssocKind;
@@ -152,8 +151,7 @@ pub(crate) fn maybe_create_entry_wrapper(
             bcx.seal_all_blocks();
             bcx.finalize();
         }
-        m.define_function(cmain_func_id, &mut ctx, &mut NullTrapSink {}, &mut NullStackMapSink {})
-            .unwrap();
+        m.define_function(cmain_func_id, &mut ctx).unwrap();
         unwind_context.add_function(cmain_func_id, &ctx, m.isa());
     }
 }
diff --git a/src/optimize/mod.rs b/src/optimize/mod.rs
index 61033d85a12..d1f89adb3bb 100644
--- a/src/optimize/mod.rs
+++ b/src/optimize/mod.rs
@@ -15,6 +15,6 @@ pub(crate) fn optimize_function<'tcx>(
 ) {
     // FIXME classify optimizations over opt levels once we have more
 
-    crate::pretty_clif::write_clif_file(tcx, "preopt", isa, instance, &ctx, &*clif_comments);
+    crate::pretty_clif::write_clif_file(tcx, "preopt", isa, instance, &ctx.func, &*clif_comments);
     crate::base::verify_func(tcx, &*clif_comments, &ctx.func);
 }
diff --git a/src/pretty_clif.rs b/src/pretty_clif.rs
index 4dffb89e105..ca7116b887d 100644
--- a/src/pretty_clif.rs
+++ b/src/pretty_clif.rs
@@ -234,7 +234,7 @@ pub(crate) fn write_clif_file<'tcx>(
     postfix: &str,
     isa: &dyn cranelift_codegen::isa::TargetIsa,
     instance: Instance<'tcx>,
-    context: &cranelift_codegen::Context,
+    func: &cranelift_codegen::ir::Function,
     mut clif_comments: &CommentWriter,
 ) {
     write_ir_file(
@@ -242,12 +242,8 @@ pub(crate) fn write_clif_file<'tcx>(
         || format!("{}.{}.clif", tcx.symbol_name(instance).name, postfix),
         |file| {
             let mut clif = String::new();
-            cranelift_codegen::write::decorate_function(
-                &mut clif_comments,
-                &mut clif,
-                &context.func,
-            )
-            .unwrap();
+            cranelift_codegen::write::decorate_function(&mut clif_comments, &mut clif, func)
+                .unwrap();
 
             for flag in isa.flags().iter() {
                 writeln!(file, "set {}", flag)?;
diff --git a/y.rs b/y.rs
index 98b114de910..18528d54297 100755
--- a/y.rs
+++ b/y.rs
@@ -23,136 +23,9 @@ exec ${0/.rs/.bin} $@
 //!
 //! The name `y.rs` was chosen to not conflict with rustc's `x.py`.
 
-use std::env;
-use std::path::PathBuf;
-use std::process;
-
-#[path = "build_system/build_backend.rs"]
-mod build_backend;
-#[path = "build_system/build_sysroot.rs"]
-mod build_sysroot;
-#[path = "build_system/config.rs"]
-mod config;
-#[path = "build_system/prepare.rs"]
-mod prepare;
-#[path = "build_system/rustc_info.rs"]
-mod rustc_info;
-#[path = "build_system/utils.rs"]
-mod utils;
-
-fn usage() {
-    eprintln!("Usage:");
-    eprintln!("  ./y.rs prepare");
-    eprintln!(
-        "  ./y.rs build [--debug] [--sysroot none|clif|llvm] [--target-dir DIR] [--no-unstable-features]"
-    );
-}
-
-macro_rules! arg_error {
-    ($($err:tt)*) => {{
-        eprintln!($($err)*);
-        usage();
-        std::process::exit(1);
-    }};
-}
-
-enum Command {
-    Build,
-}
-
-#[derive(Copy, Clone)]
-enum SysrootKind {
-    None,
-    Clif,
-    Llvm,
-}
+#[path = "build_system/mod.rs"]
+mod build_system;
 
 fn main() {
-    env::set_var("CG_CLIF_DISPLAY_CG_TIME", "1");
-    env::set_var("CG_CLIF_DISABLE_INCR_CACHE", "1");
-    // The target dir is expected in the default location. Guard against the user changing it.
-    env::set_var("CARGO_TARGET_DIR", "target");
-
-    let mut args = env::args().skip(1);
-    let command = match args.next().as_deref() {
-        Some("prepare") => {
-            if args.next().is_some() {
-                arg_error!("./x.rs prepare doesn't expect arguments");
-            }
-            prepare::prepare();
-            process::exit(0);
-        }
-        Some("build") => Command::Build,
-        Some(flag) if flag.starts_with('-') => arg_error!("Expected command found flag {}", flag),
-        Some(command) => arg_error!("Unknown command {}", command),
-        None => {
-            usage();
-            process::exit(0);
-        }
-    };
-
-    let mut target_dir = PathBuf::from("build");
-    let mut channel = "release";
-    let mut sysroot_kind = SysrootKind::Clif;
-    let mut use_unstable_features = true;
-    while let Some(arg) = args.next().as_deref() {
-        match arg {
-            "--target-dir" => {
-                target_dir = PathBuf::from(args.next().unwrap_or_else(|| {
-                    arg_error!("--target-dir requires argument");
-                }))
-            }
-            "--debug" => channel = "debug",
-            "--sysroot" => {
-                sysroot_kind = match args.next().as_deref() {
-                    Some("none") => SysrootKind::None,
-                    Some("clif") => SysrootKind::Clif,
-                    Some("llvm") => SysrootKind::Llvm,
-                    Some(arg) => arg_error!("Unknown sysroot kind {}", arg),
-                    None => arg_error!("--sysroot requires argument"),
-                }
-            }
-            "--no-unstable-features" => use_unstable_features = false,
-            flag if flag.starts_with("-") => arg_error!("Unknown flag {}", flag),
-            arg => arg_error!("Unexpected argument {}", arg),
-        }
-    }
-
-    let host_triple = if let Ok(host_triple) = std::env::var("HOST_TRIPLE") {
-        host_triple
-    } else if let Some(host_triple) = crate::config::get_value("host") {
-        host_triple
-    } else {
-        rustc_info::get_host_triple()
-    };
-    let target_triple = if let Ok(target_triple) = std::env::var("TARGET_TRIPLE") {
-        if target_triple != "" {
-            target_triple
-        } else {
-            host_triple.clone() // Empty target triple can happen on GHA
-        }
-    } else if let Some(target_triple) = crate::config::get_value("target") {
-        target_triple
-    } else {
-        host_triple.clone()
-    };
-
-    if target_triple.ends_with("-msvc") {
-        eprintln!("The MSVC toolchain is not yet supported by rustc_codegen_cranelift.");
-        eprintln!("Switch to the MinGW toolchain for Windows support.");
-        eprintln!("Hint: You can use `rustup set default-host x86_64-pc-windows-gnu` to");
-        eprintln!("set the global default target to MinGW");
-        process::exit(1);
-    }
-
-    let cg_clif_build_dir =
-        build_backend::build_backend(channel, &host_triple, use_unstable_features);
-    build_sysroot::build_sysroot(
-        channel,
-        sysroot_kind,
-        &target_dir,
-        cg_clif_build_dir,
-        &host_triple,
-        &target_triple,
-    );
+    build_system::main();
 }