[Bug tree-optimization/68976] [6 Regression] ICE w/ -O2 (and above) -fgraphite-identity (or -floop-nest-optimize)

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68976

--- Comment #15 from vries at gcc dot gnu.org ---
https://gcc.gnu.org/ml/gcc-cvs/2016-01/msg00644.html :

Author: spop
Date: Thu Jan 21 02:13:52 2016
New Revision: 232658

URL: https://gcc.gnu.org/viewcvs?rev=232658&root=gcc&view=rev
Log:
fix PR68976: only add loop close phi for names defined in loop

        * graphite-isl-ast-to-gimple.c: Fix comment.
        * graphite-scop-detection.c (defined_in_loop_p): New.
        (canonicalize_loop_closed_ssa): Do not add close phi nodes for SSA
        names defined in loop.

gcc/testsuite

        * gcc.dg/graphite/pr68976.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/graphite/pr68976.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/graphite-isl-ast-to-gimple.c
    trunk/gcc/graphite-scop-detection.c
    trunk/gcc/testsuite/ChangeLog