mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-01 06:51:58 +00:00
43 lines
1.3 KiB
Rust
43 lines
1.3 KiB
Rust
// assembly-output: emit-asm
|
|
// needs-llvm-components: x86
|
|
// revisions: TWOFLAGS SINGLEFLAG
|
|
// compile-flags: --target=x86_64-unknown-linux-gnu
|
|
// [TWOFLAGS] compile-flags: -C target-feature=+rdrnd -C target-feature=+rdseed
|
|
// [SINGLEFLAG] compile-flags: -C target-feature=+rdrnd,+rdseed
|
|
|
|
// Target features set via flags aren't necessarily reflected in the IR, so the only way to test
|
|
// them is to build code that requires the features to be enabled to work.
|
|
//
|
|
// In this particular test if `rdrnd,rdseed` somehow didn't make it to LLVM, the instruction
|
|
// selection should crash.
|
|
//
|
|
// > LLVM ERROR: Cannot select: 0x7f00f400c010: i32,i32,ch = X86ISD::RDSEED 0x7f00f400bfa8:2
|
|
// > In function: foo
|
|
//
|
|
// See also tests/codegen/target-feature-overrides.rs
|
|
#![feature(no_core, lang_items, link_llvm_intrinsics, abi_unadjusted)]
|
|
#![crate_type = "lib"]
|
|
#![no_core]
|
|
|
|
#[lang = "sized"]
|
|
trait Sized {}
|
|
#[lang = "copy"]
|
|
trait Copy {}
|
|
impl Copy for u32 {}
|
|
|
|
// Use of these requires target features to be enabled
|
|
extern "unadjusted" {
|
|
#[link_name = "llvm.x86.rdrand.32"]
|
|
fn x86_rdrand32_step() -> (u32, i32);
|
|
#[link_name = "llvm.x86.rdseed.32"]
|
|
fn x86_rdseed32_step() -> (u32, i32);
|
|
}
|
|
|
|
#[no_mangle]
|
|
pub unsafe fn foo() -> (u32, u32) {
|
|
// CHECK-LABEL: foo:
|
|
// CHECK: rdrand
|
|
// CHECK: rdseed
|
|
(x86_rdrand32_step().0, x86_rdseed32_step().0)
|
|
}
|