Rollup merge of #114230 - workingjubilee:codegen-tests-that-nest, r=Mark-Simulacrum

Nest other codegen test topics

This PR is like rust-lang/rust#114229 in that it mostly pushes codegen tests around, shoving them into their own directories, but because all of the changes are very simple cleanups I pulled them into a separate PR. The other PR might involve actually evaluating the correctness of the test after changes, but here it is mostly a matter of taste. The only "functional" change is deleting a few tests that... hinge on a version of LLVM that we don't support (as of rust-lang/rust#114148 anyways).

I considered a few different ways to group other topics but I feel the question of whether `tests/codegen/{vec,array,slice}` should exist is more subtle than these choices, as it might be better to group such related tests by other topics like bounds check elision, thus I avoided making it.

tests/codegen/box-maybe-uninit-llvm14.rs

@@ -1,34 +0,0 @@
-// compile-flags: -O
-
-// Once we're done with llvm 14 and earlier, this test can be deleted.
-
-#![crate_type = "lib"]
-
-use std::mem::MaybeUninit;
-
-// Boxing a `MaybeUninit` value should not copy junk from the stack
-#[no_mangle]
-pub fn box_uninitialized() -> Box<MaybeUninit<usize>> {
-    // CHECK-LABEL: @box_uninitialized
-    // CHECK-NOT: store
-    // CHECK-NOT: alloca
-    // CHECK-NOT: memcpy
-    // CHECK-NOT: memset
-    Box::new(MaybeUninit::uninit())
-}
-
-// https://github.com/rust-lang/rust/issues/58201
-#[no_mangle]
-pub fn box_uninitialized2() -> Box<MaybeUninit<[usize; 1024 * 1024]>> {
-    // CHECK-LABEL: @box_uninitialized2
-    // CHECK-NOT: store
-    // CHECK-NOT: alloca
-    // CHECK-NOT: memcpy
-    // CHECK-NOT: memset
-    Box::new(MaybeUninit::uninit())
-}
-
-// Hide the LLVM 15+ `allocalign` attribute in the declaration of __rust_alloc
-// from the CHECK-NOT above. We don't check the attributes here because we can't rely
-// on all of them being set until LLVM 15.
-// CHECK: declare {{(dso_local )?}}noalias{{.*}} @__rust_alloc(i{{[0-9]+}} noundef, i{{[0-9]+.*}} noundef)

tests/codegen/vec-calloc-llvm14.rs

@@ -1,144 +0,0 @@
-// compile-flags: -O
-// only-x86_64
-// ignore-debug
-
-#![crate_type = "lib"]
-
-// CHECK-LABEL: @vec_zero_bytes
-#[no_mangle]
-pub fn vec_zero_bytes(n: usize) -> Vec<u8> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-    // CHECK-NOT: call {{.*}}llvm.memset
-
-    // CHECK: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-    // CHECK-NOT: call {{.*}}llvm.memset
-
-    // CHECK: ret void
-    vec![0; n]
-}
-
-// CHECK-LABEL: @vec_one_bytes
-#[no_mangle]
-pub fn vec_one_bytes(n: usize) -> Vec<u8> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK: call {{.*}}__rust_alloc(
-    // CHECK: call {{.*}}llvm.memset
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK: ret void
-    vec![1; n]
-}
-
-// CHECK-LABEL: @vec_zero_scalar
-#[no_mangle]
-pub fn vec_zero_scalar(n: usize) -> Vec<i32> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: ret void
-    vec![0; n]
-}
-
-// CHECK-LABEL: @vec_one_scalar
-#[no_mangle]
-pub fn vec_one_scalar(n: usize) -> Vec<i32> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK: call {{.*}}__rust_alloc(
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK: ret void
-    vec![1; n]
-}
-
-// CHECK-LABEL: @vec_zero_rgb48
-#[no_mangle]
-pub fn vec_zero_rgb48(n: usize) -> Vec<[u16; 3]> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: ret void
-    vec![[0, 0, 0]; n]
-}
-
-// CHECK-LABEL: @vec_zero_array_16
-#[no_mangle]
-pub fn vec_zero_array_16(n: usize) -> Vec<[i64; 16]> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: ret void
-    vec![[0_i64; 16]; n]
-}
-
-// CHECK-LABEL: @vec_zero_tuple
-#[no_mangle]
-pub fn vec_zero_tuple(n: usize) -> Vec<(i16, u8, char)> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc(
-
-    // CHECK: ret void
-    vec![(0, 0, '\0'); n]
-}
-
-// CHECK-LABEL: @vec_non_zero_tuple
-#[no_mangle]
-pub fn vec_non_zero_tuple(n: usize) -> Vec<(i16, u8, char)> {
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK: call {{.*}}__rust_alloc(
-
-    // CHECK-NOT: call {{.*}}alloc::vec::from_elem
-    // CHECK-NOT: call {{.*}}reserve
-    // CHECK-NOT: call {{.*}}__rust_alloc_zeroed(
-
-    // CHECK: ret void
-    vec![(0, 0, 'A'); n]
-}