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[arm] fix aarch64 cls intrinsic

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gnzlbg 2017-09-28 11:29:53 +02:00 • committed by Andrew Gallant
parent e0176b278f
commit ffc69c752e
1 changed files with 4 additions and 6 deletions
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10
library/stdarch/src/arm/v8.rs
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@ -39,10 +39,9 @@ pub unsafe fn _rbit_u64(x: u64) -> u64 {
/// When all bits of the operand are set it returns the size of the operand in
/// bits.
#[inline(always)]
// LLVM Bug (should be cls): https://bugs.llvm.org/show_bug.cgi?id=31802
#[cfg_attr(test, assert_instr(clz))]
#[cfg_attr(test, assert_instr(cls))]
pub unsafe fn _cls_u32(x: u32) -> u32 {
u32::leading_zeros(!x) as u32
u32::leading_zeros(((((((x as i32) >> 31) as u32) ^ x) << 1) | 1)) as u32
}
/// Counts the leading most significant bits set.
@ -50,8 +49,7 @@ pub unsafe fn _cls_u32(x: u32) -> u32 {
/// When all bits of the operand are set it returns the size of the operand in
/// bits.
#[inline(always)]
// LLVM Bug (should be cls): https://bugs.llvm.org/show_bug.cgi?id=31802
#[cfg_attr(test, assert_instr(clz))]
#[cfg_attr(test, assert_instr(cls))]
pub unsafe fn _cls_u64(x: u64) -> u64 {
u64::leading_zeros(!x) as u64
u64::leading_zeros(((((((x as i64) >> 63) as u64) ^ x) << 1) | 1)) as u64
}