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Don't use aarch64 hint for arm targets

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This commit is contained in:
Alejandro Alonso
2024-06-10 09:23:21 -07:00
parent 25830d6bc3
commit e3a53abe13
1 changed files with 20 additions and 0 deletions
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20
stdlib/public/Synchronization/Mutex/SpinLoopHint.swift
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@@ -17,6 +17,8 @@ var _tries: Int {
100
}
#if arch(arm)
// The following are acceptable operands to the aarch64 hint intrinsic from
// 'llvm-project/llvm/lib/Target/ARM/ARMInstrInfo.td':
//
@@ -28,9 +30,27 @@ var _tries: Int {
// `sevl` = 5
//
// There are others, but for the sake of spin loops, we only care about 'wfe'.
@_extern(c, "llvm.arm.hint")
func _hint(_: UInt32)
#else
// The following are acceptable operands to the aarch64 hint intrinsic from
// 'llvm-project/llvm/lib/Target/AArch64/AArch64InstrInfo.td':
//
// `nop` = 0
// `yield` = 1
// `wfe` = 2
// `wfi` = 3
// `sev` = 4
// `sevl` = 5
//
// There are others, but for the sake of spin loops, we only care about 'wfe'.
@_extern(c, "llvm.aarch64.hint")
func _hint(_: UInt32)
#endif
@inline(__always)
func _wfe() {
_hint(2)