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