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