dotnet/runtime
Unnecessary sign-extension for some never-negative expressions
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#119,680 创建于 2025年9月13日
area-CodeGen-coreclrhelp wanted
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描述
nint M1(uint mask) {
return BitOperations.TrailingZeroCount(mask) / sizeof(ushort);
}
nint M2(uint mask) {
return (nint)(uint.TrailingZeroCount(mask) / sizeof(ushort));
}
C:M1(uint):nint:this (FullOpts):
xor eax, eax
tzcnt eax, esi
shr eax, 1
cdqe
ret
C:M2(uint):nint:this (FullOpts):
xor eax, eax
tzcnt eax, esi
shr eax, 1
ret