[Bug middle-end/81832] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2273
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81832 amker at gcc dot gnu.org changed: What|Removed |Added Status|NEW |RESOLVED CC||amker at gcc dot gnu.org Resolution|--- |FIXED --- Comment #4 from amker at gcc dot gnu.org --- fixed.
[Bug middle-end/81832] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2273
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81832 --- Comment #3 from Aldy Hernandez --- Author: aldyh Date: Wed Sep 13 17:01:56 2017 New Revision: 252444 URL: https://gcc.gnu.org/viewcvs?rev=252444=gcc=rev Log: PR tree-optimization/81832 * tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Don't copy loop header which has IFN_LOOP_DIST_ALIAS call. gcc/testsuite * gcc.dg/tree-ssa/pr81832.c: New test. Added: branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr81832.c Modified: branches/range-gen2/gcc/ChangeLog branches/range-gen2/gcc/testsuite/ChangeLog branches/range-gen2/gcc/tree-ssa-loop-ch.c
[Bug middle-end/81832] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2273
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81832 --- Comment #2 from amker at gcc dot gnu.org --- Author: amker Date: Wed Aug 16 15:02:03 2017 New Revision: 251123 URL: https://gcc.gnu.org/viewcvs?rev=251123=gcc=rev Log: PR tree-optimization/81832 * tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Don't copy loop header which has IFN_LOOP_DIST_ALIAS call. gcc/testsuite * gcc.dg/tree-ssa/pr81832.c: New test. Added: trunk/gcc/testsuite/gcc.dg/tree-ssa/pr81832.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-loop-ch.c
[Bug middle-end/81832] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2273
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81832 --- Comment #4 from amker at gcc dot gnu.org --- Testing a patch.
[Bug middle-end/81832] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2273
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81832 --- Comment #3 from Martin Liška --- > I think this is a general and latent problem with the interaction between > the copy-header pass, and the loop distribution pass. Tracing back further I > see this start with r249994 . Yes, sorry for not tracking precisely, r249994 is the first one ICEing.
[Bug middle-end/81832] [8 Regression] ICE in expand_LOOP_DIST_ALIAS, at internal-fn.c:2273
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81832 James Greenhalgh changed: What|Removed |Added CC||amker at gcc dot gnu.org --- Comment #2 from James Greenhalgh --- (In reply to Martin Liška from comment #1) > Confirmed, started with r250619. Interesting. That commit seems unlikely to have broken anything (if it does, the bug would be latent and would have been possible to trigger using the revision prior). My bisect points to r250959 , which seems much more likely, given the backtrace. What I imagine you've done with your bisect is continued back through the revisions with -ftree-loop-distribute set, that does get you to r250619, but as this is also really just a change to default "options", you should continue going back with -ftree-vectorize to find the real culprit. For example, r250617 will also ICE with -O3 -ftree-loop-distribute -ftree-vectorize . I think this is a general and latent problem with the interaction between the copy-header pass, and the loop distribution pass. Tracing back further I see this start with r249994 .
