https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14418
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
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Last reconfirmed|2006-10-22 21:08:49 |2021-7-19
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
-m32:
pushl %esi
pushl %ebx
subl $16, %esp
movl 28(%esp), %ebx
movl 32(%esp), %esi
leal (%ebx,%ebx), %eax
pushl %eax
call bar
movl %esi, 36(%esp)
movl %ebx, 32(%esp)
addl $20, %esp
popl %ebx
popl %esi
jmp quux
-m32 -march=i686:
subl $28, %esp
movl %ebx, 20(%esp)
movl 32(%esp), %ebx
movl %esi, 24(%esp)
movl 36(%esp), %esi
leal (%ebx,%ebx), %eax
movl %eax, (%esp)
call bar
movl %esi, 36(%esp)
movl 24(%esp), %esi
movl %ebx, 32(%esp)
movl 20(%esp), %ebx
addl $28, %esp
jmp quux
So in the non-i686 case, it is doing push/pop's do the same as the mov's.
