https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97743
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-11-06
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Component|tree-optimization |middle-end
Target| |x86_64-*-*
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
But is it really faster?
movzbl %dil, %eax
imull $743, %eax, %eax
vs.
negb %dil
sbbl %eax, %eax
andl $743, %eax
clang9 produces
testl %edi, %edi
movl $743, %eax # imm = 0x2E7
cmovel %edi, %eax
more like a middle-end/RTL expansion transform, target dependent.
