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Compile spin_loop_hint as pause on x86 even without sse2 enabled #101495

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merged 1 commit into from
Sep 9, 2022
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Compile spin_loop_hint as pause on x86 even without sse2 enabled #101495

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19 changes: 8 additions & 11 deletions library/core/src/hint.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -160,19 +160,16 @@ pub const unsafe fn unreachable_unchecked() -> ! {
#[inline]
#[stable(feature = "renamed_spin_loop", since = "1.49.0")]
pub fn spin_loop() {
#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "sse2"))]
#[cfg(target_arch = "x86")]
{
#[cfg(target_arch = "x86")]
{
// SAFETY: the `cfg` attr ensures that we only execute this on x86 targets.
unsafe { crate::arch::x86::_mm_pause() };
}
// SAFETY: the `cfg` attr ensures that we only execute this on x86 targets.
unsafe { crate::arch::x86::_mm_pause() };
}

#[cfg(target_arch = "x86_64")]
{
// SAFETY: the `cfg` attr ensures that we only execute this on x86_64 targets.
unsafe { crate::arch::x86_64::_mm_pause() };
}
#[cfg(target_arch = "x86_64")]
{
// SAFETY: the `cfg` attr ensures that we only execute this on x86_64 targets.
unsafe { crate::arch::x86_64::_mm_pause() };
}

// RISC-V platform spin loop hint implementation
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