[Bug rtl-optimization/40838] gcc shouldn't assume that the stack is aligned

[hjl dot tools at gmail dot com]

------- Comment #24 from hjl dot tools at gmail dot com  2009-08-16 17:37 -------
(In reply to comment #23)
> (In reply to comment #21)
> 
> Unfortunatelly, that patch is wrong. It aligns when there is some vector type
> in the function but it doesn't align if the autovectorizer creates SSE
> instructions. Try that obstack example in comment #12 and you see that the
> function my_alloc uses 16-byte sse instructions on stack and it doesn't have
> aligned stack with the patch.
>

I got

my_alloc:
        pushl   %ebp
        movl    $.LC0, %edx
        movl    %esp, %ebp
        andl    $-16, %esp
        pushl   %ebx

It looks OK to me.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838