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From: Andrew Thomas Pinski <pinskia@gmail.com>
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Subject: Re: [Bug tree-optimization/39455] [4.3/4.4 Regression] ICE : in compare_values_warnv, at tree-vrp.c:1073
Date: Mon, 16 Mar 2009 08:28:00 -0000
Cc: "gcc-bugs@gcc.gnu.org" <gcc-bugs@gcc.gnu.org>
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Sent from my iPhone

On Mar 16, 2009, at 1:15 AM, "jakub at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org 
 > wrote:

>
>
> ------- Comment #7 from jakub at gcc dot gnu dot org  2009-03-16  
> 08:15 -------
> Reduced testcase:
>
> /* { dg-do compile } */
> /* { dg-options "-O2 -fprefetch-loop-arrays" } */
>
> void
> foo (char *x, unsigned long y, unsigned char *z)
> {
>  unsigned int c[256], *d;
>
>  for (d = c + 1; d < c + 256; ++d)
>    *d += d[-1];
>  x[--c[z[y]]] = 0;

Hmm. Could this be the char-- bug? Where the front-end/gimplifier does  
not promote that to int?

Thanks,
Andrew Pinski

>
> }
>
>
> -- 
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39455
>