[Bug tree-optimization/30930] [4.3/4.4 Regression] vector can cause to create an extra variable, DECL_GIMPLE_REG_P not recomputed

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

------- Comment #12 from rguenther at suse dot de  2008-09-18 08:23 -------
Subject: Re:  [4.3/4.4 Regression] vector can
 cause to create an extra variable, DECL_GIMPLE_REG_P not recomputed

On Wed, 17 Sep 2008, pinskia at gcc dot gnu dot org wrote:

> ------- Comment #10 from pinskia at gcc dot gnu dot org  2008-09-17 22:50 -------
> Here is a testcase where we were missing an optimization at the tree level
> because of DECL_GIMPLE_REG_P:
> #define vector __attribute__(( vector_size(16) ))
> 
> float f(vector float a, int b, vector float c)
> {
>   vector float dd = c*a;
>   a = (vector float){0,0,0,0};
>   c = (vector float){0,0,0,0};
>   {
>    float d = ((float*)&a)[0];
>    float d1 = ((float*)&c)[0];
>    return d*d1;
>   }
> }

I wonder why we not just can add both, TREE_ADDRESSABLE and
DECL_GIMPLE_REG_P ...

Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30930