[Bug tree-optimization/23286] missed fully redundant expression

["dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From dberlin at gcc dot gnu dot org  2005-08-08 20:29 -------
Subject: Re:  missed fully redundant expression

On Mon, 2005-08-08 at 19:54 +0000, pinskia at gcc dot gnu dot org wrote:
> ------- Additional Comments From pinskia at gcc dot gnu dot org  2005-08-08 19:54 -------
> Here is a stupid testcase which can be sped up by pulling the reduandant expressions up:
> int ii;
> static inline int f(int i, int ii)
> {
>   return i/ ii;
> }
> 
> int h(int) __attribute__((pure,const));
> 
> int g(int i)
> {
>   int j, j1 = i;
>   for (j = 0; j <1000; j++)
>     {
>       int ii1 = ii;
>       if (h(j))
>         i = j1/ii1 + 2;
>       else
>         i = j1/ii1;
>     }
>   return i;
> }
> 

Yes, if we hoisted this, we would then pull it out of the loop.




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23286