https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110479
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #1)
> (In reply to Thomas Koenig from comment #0)
>
> > movl %edi, %ecx
>
> This one? It is needed because SAL wants its count argument in %cl and first
> argument is passed in %edi (mandated by x86_64 ABI).
>
> With -mbmi2, one gets:
>
> shrl $10, %edi
> movl $1, %eax
> andl $3, %edi
> addl $3, %edi
> shlx %edi, %eax, %eax
> ret
Hm, you're right. The intricacies of x86...
Closing.
