| Issue |
135829
|
| Summary |
two-instruction pass actually worsens codegen
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
AZero13
|
https://godbolt.org/z/vrexqnWoe
There is nothing wrong with:
add edi, esi
mov eax, edi
sub edi, edx
cmovnc eax, edi
ret
But the two-address pass makes it:
lea eax, [rdi + rsi]
xor ecx, ecx
cmp eax, edx
cmovae ecx, edx
sub eax, ecx
ret
which is actually less optimal.
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