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[Bug middle-end/49662] [4.7 Regression] FAIL: gcc.dg/graphite/interchange-XX.c
- From: "spop at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 7 Jul 2011 22:40:59 +0000
- Subject: [Bug middle-end/49662] [4.7 Regression] FAIL: gcc.dg/graphite/interchange-XX.c
- Auto-submitted: auto-generated
- References: <bug-49662-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49662
--- Comment #2 from Sebastian Pop <spop at gcc dot gnu.org> 2011-07-07 22:40:34 UTC ---
The loop nest is not perfect, in interchange-15.c:
for (i = 0; i < N; i++)
for (j = 0; j < N; j++)
x[i] += a[j][i];
used to be perfect nest, now we have x[i] read and written in
the outer loop, enough to confuse loop interchange.
Please XFail the testcases, or change them to only have a
scalar reduction:
for (i = 0; i < N; i++)
for (j = 0; j < N; j++)
x += a[j][i];