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Simplify core::hint::spin_loop

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This commit is contained in:
Maybe Waffle 2023-09-04 19:53:40 +00:00
parent bf1e3f31f9
commit 1811fe6af0
1 changed files with 17 additions and 24 deletions
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41
library/core/src/hint.rs
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@ -175,34 +175,27 @@ pub fn spin_loop() {
unsafe { crate::arch::x86_64::_mm_pause() };
}
// RISC-V platform spin loop hint implementation
#[cfg(target_arch = "riscv32")]
{
// RISC-V RV32 and RV64 share the same PAUSE instruction, but they are located in different
// modules in `core::arch`.
// In this case, here we call `pause` function in each core arch module.
#[cfg(target_arch = "riscv32")]
{
crate::arch::riscv32::pause();
}
#[cfg(target_arch = "riscv64")]
{
crate::arch::riscv64::pause();
}
crate::arch::riscv32::pause();
}
#[cfg(any(target_arch = "aarch64", all(target_arch = "arm", target_feature = "v6")))]
#[cfg(target_arch = "riscv64")]
{
#[cfg(target_arch = "aarch64")]
{
// SAFETY: the `cfg` attr ensures that we only execute this on aarch64 targets.
unsafe { crate::arch::aarch64::__isb(crate::arch::aarch64::SY) };
}
#[cfg(target_arch = "arm")]
{
// SAFETY: the `cfg` attr ensures that we only execute this on arm targets
// with support for the v6 feature.
unsafe { crate::arch::arm::__yield() };
}
crate::arch::riscv64::pause();
}
#[cfg(target_arch = "aarch64")]
{
// SAFETY: the `cfg` attr ensures that we only execute this on aarch64 targets.
unsafe { crate::arch::aarch64::__isb(crate::arch::aarch64::SY) };
}
#[cfg(all(target_arch = "arm", target_feature = "v6"))]
{
// SAFETY: the `cfg` attr ensures that we only execute this on arm targets
// with support for the v6 feature.
unsafe { crate::arch::arm::__yield() };
}
}