mirror of https://github.com/rust-lang/rust
30 lines
981 B
Rust
30 lines
981 B
Rust
//@ revisions: x86_64 aarch64
|
|
//@ assembly-output: emit-asm
|
|
//@ compile-flags: --crate-type=lib -O
|
|
//@[aarch64] only-aarch64
|
|
//@[x86_64] only-x86_64
|
|
//@[x86_64] compile-flags: -Ctarget-feature=+sse3
|
|
#![feature(portable_simd)]
|
|
#![feature(core_intrinsics)]
|
|
use std::intrinsics::simd as intrinsics;
|
|
use std::simd::*;
|
|
// Regression test for https://github.com/rust-lang/rust/issues/130028
|
|
// This intrinsic produces much worse code if you use +0.0 instead of -0.0 because
|
|
// +0.0 isn't as easy to algebraically reassociate, even using LLVM's reassoc attribute!
|
|
// It would emit about an extra fadd, depending on the architecture.
|
|
|
|
// CHECK-LABEL: reduce_fadd_negative_zero
|
|
pub unsafe fn reduce_fadd_negative_zero(v: f32x4) -> f32 {
|
|
// x86_64: addps
|
|
// x86_64-NEXT: movshdup
|
|
// x86_64-NEXT: addss
|
|
// x86_64-NOT: xorps
|
|
|
|
// aarch64: faddp
|
|
// aarch64-NEXT: faddp
|
|
|
|
// CHECK-NOT: {{f?}}add{{p?s*}}
|
|
// CHECK: ret
|
|
intrinsics::simd_reduce_add_unordered(v)
|
|
}
|