https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94795
--- Comment #2 from Gabriel Ravier <gabravier at gmail dot com> ---
Also, I can also provide this a very similar function for which such an
optimization could be helpful :
int f(int x)
{
return -(x == 0);
}
LLVM optimises that function to this :
f(int):
cmp edi, 1
sbb eax, eax
ret
Whereas GCC currently does
f(int):
xor eax, eax
test edi, edi
sete al
neg eax
ret
instead (see also https://godbolt.org/z/5_bRCR)
