[Bug tree-optimization/35518] [4.4 Regression] FAIL: gcc.c-torture/execute/20040709-1.c execution at -O2 and above

["rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #14 from rguenther at suse dot de  2008-06-22 21:13 -------
Subject: Re:  [4.4 Regression] FAIL:
 gcc.c-torture/execute/20040709-1.c execution at -O2 and above

On Sun, 22 Jun 2008, danglin at gcc dot gnu dot org wrote:

> ------- Comment #13 from danglin at gcc dot gnu dot org  2008-06-22 20:44 -------
> retmeK (struct K x)
> {
>   <unnamed-unsigned:10> SR.14;
>   <unnamed-unsigned:15> SR.13;
>   <unnamed-unsigned:7> SR.12;
>   <unnamed-unsigned:10> SR.11;
>   <unnamed-unsigned:15> SR.10;
>   <unnamed-unsigned:15> x$i;
>   <unnamed-unsigned:10> x$j;
>   <unnamed-unsigned:7> x$B0F7;
>   struct K D.1258;
> 
> <bb 2>:
>   x$B0F7_1 = 0;
>   x$j_2 = 0;
>   x$i_3 = 0;
>   SR.13_4 = x.i;
>   x$i_5 = SR.13_4;
>   SR.14_6 = x.j;
>   x$j_7 = SR.14_6;
>   x$B0F7_8 = BIT_FIELD_REF <x, 7, 0>;
>   D.1258.i ={v} x$i_5;
>   D.1258.j ={v} x$j_7;
>   SR.12_9 = x$B0F7_8 >> 1;
>   BIT_FIELD_REF <D.1258, 7, 0> ={v} SR.12_9;
>   return D.1258;
> 
> }
> 
> Don't understand...
> 
> At -O0, we just have
> 
> retmeK (struct K x)
> {
>   struct K D.1260;
> 
> <bb 2>:
>   D.1260 = x;
>   return D.1260;
> 
> }
> 
> and it works.

Well, SRA is broken (cost-wise at least) since lxos changes.

Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35518