[Bug target/97873] Failure to optimize abs optimally (at least one completely useless instruction on x86)

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97873

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
gcc-7 goes the x86 abs expander way:

abs:
.LFB0:
        .cfi_startproc
        movl    %edi, %edx
        movl    %edi, %eax
        sarl    $31, %edx
        xorl    %edx, %eax
        subl    %edx, %eax
        ret