https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65056
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |10.0
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC 8+ gets rid of the compare for andq and GCC produces:
.L11:
movq %r8, %rcx
andq (%rdi,%rdx,8), %rcx
movq %r9, %r8
jne .L10
.L3:
subq $1, %rdx
cmpq $-1, %rdx
jne .L11
This was fixed by r8-3869.
GCC 10+ gets rid of the compare for the subq and GCC produces:
.L11:
andq (%rdi,%rax,8), %rdx
movq %rdx, %rcx
movq $-1, %rdx
jne .L10
.L3:
subq $1, %rax
jnb .L11
There was a lot of carry improvements for GCC 10 and that fixed that one.
