------- Comment #3 from pluto at agmk dot net 2006-09-05 21:35 -------
(In reply to comment #1)
> -funswitch-loops fixes the loops.
i don't think it is fixed. imho this is only a partial fix.
> For the first function, we get:
> .L4:
> movl %ebx, (%esp)
> call *%esi
> jmp .L4
>
> and:
> .L3:
> movl (%ebx), %eax <=== [1]
> movl %ebx, (%esp)
> call *-1(%eax,%edi) <=== [1]
> .p2align 4,,4
> jmp .L3
[1] is still less effective than optimized_loop.
movl 12(%ebp), %eax # f, f
movl 8(%ebp), %esi # a, a
movl 16(%ebp), %edx # f, f
testb $1, %al #, f$__pfn
movl %eax, %ebx # f, f$__pfn
je .L13
movl (%esi,%edx), %eax #* f$__delta, tmp65
movl -1(%eax,%ebx), %ebx #, f$__pfn
.L13:
movl %esi, (%esp) # a,
call *%ebx # f$__pfn
jmp .L13
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28957
