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[Bug tree-optimization/66652] try_transform_to_exit_first_loop_alt generates incorrect loop
- From: "vries at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 25 Jun 2015 12:37:04 +0000
- Subject: [Bug tree-optimization/66652] try_transform_to_exit_first_loop_alt generates incorrect loop
- Auto-submitted: auto-generated
- References: <bug-66652-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66652
--- Comment #1 from vries at gcc dot gnu.org ---
Created attachment 35853
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35853&action=edit
demonstrator patch
This patch fixes the correctness issue, but it fails to do
transform_to_exit_first_loop_alt for unsigned loop counters:
...
PASS: gcc.dg/parloops-exit-first-loop-alt-2.c (test for excess errors)
PASS: gcc.dg/parloops-exit-first-loop-alt-2.c scan-tree-dump-times parloops
"(?n)\\[i" 9
PASS: gcc.dg/parloops-exit-first-loop-alt-3.c (test for excess errors)
FAIL: gcc.dg/parloops-exit-first-loop-alt-3.c scan-tree-dump-times parloops
"(?n)\\* 4" 3
PASS: gcc.dg/parloops-exit-first-loop-alt-4.c (test for excess errors)
PASS: gcc.dg/parloops-exit-first-loop-alt-4.c scan-tree-dump-times parloops
"(?n)\\* 4" 3
PASS: gcc.dg/parloops-exit-first-loop-alt-5.c (test for excess errors)
PASS: gcc.dg/parloops-exit-first-loop-alt-5.c scan-tree-dump-times parloops
"(?n)% 13" 4
PASS: gcc.dg/parloops-exit-first-loop-alt-6.c (test for excess errors)
FAIL: gcc.dg/parloops-exit-first-loop-alt-6.c scan-tree-dump-times parloops
"(?n)\\[i" 9
PASS: gcc.dg/parloops-exit-first-loop-alt-7.c (test for excess errors)
FAIL: gcc.dg/parloops-exit-first-loop-alt-7.c scan-tree-dump-times parloops
"(?n)\\[i" 9
PASS: gcc.dg/parloops-exit-first-loop-alt-8.c (test for excess errors)
FAIL: gcc.dg/parloops-exit-first-loop-alt-8.c scan-tree-dump-times parloops
"(?n)\\[i" 9
PASS: gcc.dg/parloops-exit-first-loop-alt.c (test for excess errors)
FAIL: gcc.dg/parloops-exit-first-loop-alt.c scan-tree-dump-times parloops
"(?n)\\[i" 9
...