[Bug tree-optimization/18892] missed optimization with & and ==

[dnovillo at redhat dot com]

------- Additional Comments From dnovillo at redhat dot com  2004-12-08 20:28 -------
Subject: Re:  New: missed SRA of a block copy

pinskia at gcc dot gnu dot org wrote:
> The following function:
> int f(int a)
> {
>   int i = a & -129;
>   return i == 144;
> }
> Should be compiled to:
> int f1(int a)
> {
>   return (a & -129) == 144; // aka return 0;
> }
> 
> Yes this shows up in real code (gcc), found while testing out my tree combiner.
> 
Hmm?  What does SRA have to do with anything here?


Diego.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18892