gcc4.0 autovect-branch

Daniel Berlin dberlin@dberlin.org
Fri Dec 17 17:04:00 GMT 2004


On Fri, 2004-12-17 at 17:47 +0100, Villemin Ryusuke wrote:
> Hi,
> 
> I might be missing something simple and obvious, but I can't find out what :
> I picked up gcc4.0 in the autovect-branch, compiled it successfully but can t make it vectorize anything.
> 
> int a[256], b[256], c[256];
> 
> foo () {
>   int i;
>   for (i=0; i<256; i++){
>     a[i] = b[i] + c[i];
>   }
> }
> 
> compiled with :
> "gcc -O2 -msse2 -ftree-vectorize -fdump-tree-vect-stats vecto.c".
> 
> I expect to see a "LOOP VECTORIZED." (or at least "not vectorized:"), but I have nothing...
> 
> Any ideas ?
> 
I get

;; Function foo (foo)


loop at /home/dberlin/vect.c:7: if (ivtmp.23_38 < 64) goto <L5>; else
goto <L2>;
loop at /home/dberlin/vect.c:7: LOOP VECTORIZED.



in the dump file for the vectorizer.

What do you see?




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