[Bug middle-end/32492] [4.3 Regression] attribute always_inline -> sorry, unimplemented: recursive inlining

[pinskia at gmail dot com]

------- Comment #13 from pinskia at gmail dot com  2007-06-26 21:59 -------
Subject: Re:  [4.3 Regression] attribute always_inline -> sorry, unimplemented:
recursive inlining

On 26 Jun 2007 21:55:34 -0000, rguenther at suse dot de
<gcc-bugzilla@gcc.gnu.org> wrote:
> I have a hard time deciding if 3.4 or 4.1 is better:
>
> 3.4:
>
> f:
>         pushl   %ebp
>         movl    %esp, %ebp
>         movl    8(%ebp), %edx
>         movzbl  12(%ebp), %eax
>         testl   %edx, %edx
>         je      .L2
>         movb    $1, %al
> .L2:
>         movsbl  %al,%eax
<---- unconditional movsbl.
>         movl    %eax, 8(%ebp)
>         popl    %ebp
>         jmp     g
>
> 4.1 (same as 4.2):
>
> f:
>         pushl   %ebp
>         movl    $1, %edx
>         movl    %esp, %ebp
>         movl    8(%ebp), %ecx
>         movzbl  12(%ebp), %eax
>         testl   %ecx, %ecx
>         je      .L7
>         movl    %edx, 8(%ebp)
>         popl    %ebp
>         jmp     g
>         .p2align 4,,7
> .L7:
>         movsbl  %al,%edx
// <--- condtional movsbl
>         movl    %edx, 8(%ebp)
>         popl    %ebp
>         jmp     g

It is easier to see the diference between 3.4 and the trunk where we
don't duplicate the tail call to g.

Thanks,
Andrew Pinski


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32492