[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010 --- Comment #7 from Richard Biener rguenth at gcc dot gnu.org --- Author: rguenth Date: Fri Aug 30 07:47:54 2013 New Revision: 202095 URL: http://gcc.gnu.org/viewcvs?rev=202095root=gccview=rev Log: 2013-08-30 Richard Biener rguent...@suse.de PR tree-optimization/58010 * tree-vect-loop.c (vect_create_epilog_for_reduction): Remove assert that we have a loop-closed PHI. * gcc.dg/pr58010.c: New testcase. Added: trunk/gcc/testsuite/gcc.dg/pr58010.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-vect-loop.c
[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010 Richard Biener rguenth at gcc dot gnu.org changed: What|Removed |Added Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org --- Comment #5 from Richard Biener rguenth at gcc dot gnu.org --- Mine.
[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010 --- Comment #6 from Richard Biener rguenth at gcc dot gnu.org --- In the loop in question we have a dead scalar cycle for which we do not insert loop-closed PHI nodes. Hm. The correct fix looks easy though - simply remove the assert. We'll vectorize dead code, but who cares. Testing that.
[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010 Jakub Jelinek jakub at gcc dot gnu.org changed: What|Removed |Added CC||jakub at gcc dot gnu.org --- Comment #4 from Jakub Jelinek jakub at gcc dot gnu.org --- With -O2 -funswitch-loops -fvectorize -fno-vect-const-model it started with r178728 . Richard, when you are back, can you please look at this?
[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010 Marek Polacek mpolacek at gcc dot gnu.org changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed||2013-08-02 CC||mpolacek at gcc dot gnu.org Known to work||4.7.3 Target Milestone|--- |4.8.2 Summary|ICE in |[4.8/4.9 Regression] ICE in |vect_create_epilog_for_redu |vect_create_epilog_for_redu |ction, at |ction, at |tree-vect-loop.c:4378 |tree-vect-loop.c:4378 Ever confirmed|0 |1 Known to fail||4.8.1, 4.9.0 --- Comment #1 from Marek Polacek mpolacek at gcc dot gnu.org --- Confirmed.
[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010 Marek Polacek mpolacek at gcc dot gnu.org changed: What|Removed |Added CC||wschmidt at gcc dot gnu.org --- Comment #2 from Marek Polacek mpolacek at gcc dot gnu.org --- Started with http://gcc.gnu.org/r189527
[Bug tree-optimization/58010] [4.8/4.9 Regression] ICE in vect_create_epilog_for_reduction, at tree-vect-loop.c:4378
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58010 --- Comment #3 from Bill Schmidt wschmidt at gcc dot gnu.org --- r189527 is probably a red herring. That just changed the cost model to be turned on by default at -O3. Somebody who's actively working on the vectorizer should probably have a look at this. If you want to narrow it down further, try turning on -fvect-cost-model and bisecting. The problem will probably show up as being introduced further back if you do this. This also suggests a workaround for the OP of using -fno-vect-cost-model, if a workaround is needed.
