------- Comment #4 from sebpop at gmail dot com 2009-10-23 19:54 -------
Subject: Re: graphite miscompiles 454.calculix
of the SPEC 2k6
On Fri, Oct 23, 2009 at 14:46, spop at gcc dot gnu dot org
<gcc-bugzi...@gcc.gnu.org> wrote:
> and the code generated by CLooG for the interchange looks like this:
>
> for (scat_1=0;scat_1<=2;scat_1++) {
> Â for (scat_3=0;scat_3<=2;scat_3++) {
> Â Â S4(scat_1,scat_3) ;
> Â Â for (scat_5=0;scat_5<=2;scat_5++) {
> Â Â Â S5(scat_1,scat_5,scat_3) ;
> Â Â }
> Â Â S7(scat_1,scat_3) ;
> Â Â S18(scat_1,scat_3) ;
> Â }
S7 and S18 should not be generated before S5 finishes to execute over
all the iterations of the original innermost loop (do k=1,20).
S7 and S18 contain the end of the reduction and the write in the array
xs(i,j) that is independent of the k loop.
> Â for (scat_3=3;scat_3<=19;scat_3++) {
> Â Â for (scat_5=0;scat_5<=2;scat_5++) {
> Â Â Â S5(scat_1,scat_5,scat_3) ;
> Â Â }
> Â }
> }
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41811
