mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-30 10:45:18 +00:00
39 lines
987 B
Rust
39 lines
987 B
Rust
//@ run-pass
|
|
//@ only-x86_64
|
|
//@ compile-flags: -C opt-level=3
|
|
|
|
// Regression test for issue #79865.
|
|
// The assertion will fail when compiled with Rust 1.56..=1.59
|
|
// due to an LLVM miscompilation.
|
|
|
|
use std::arch::x86_64::*;
|
|
|
|
fn main() {
|
|
if is_x86_feature_detected!("avx") {
|
|
let res: [f64; 4] = unsafe { std::mem::transmute::<_, _>(first()) };
|
|
assert_eq!(res, [22.0, 44.0, 66.0, 88.0]);
|
|
}
|
|
}
|
|
|
|
#[target_feature(enable = "avx")]
|
|
unsafe fn first() -> __m256d {
|
|
second()
|
|
}
|
|
|
|
unsafe fn second() -> __m256d {
|
|
let v0 = _mm256_setr_pd(1.0, 2.0, 3.0, 4.0);
|
|
let v1 = _mm256_setr_pd(10.0, 20.0, 30.0, 40.0);
|
|
|
|
// needs to be called twice to hit the miscompilation
|
|
let (add, _) = add_sub(v0, v1);
|
|
let (add, _) = add_sub(add, add);
|
|
add
|
|
}
|
|
|
|
#[inline(never)] // needed to hit the miscompilation
|
|
unsafe fn add_sub(v1: __m256d, v0: __m256d) -> (__m256d, __m256d) {
|
|
let add = _mm256_add_pd(v0, v1);
|
|
let sub = _mm256_sub_pd(v0, v1);
|
|
(add, sub)
|
|
}
|