[Bug tree-optimization/87895] [7/8 Regression] ICE in purge_dead_edges, at cfgrtl.c:3246

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87895

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Jan  8 09:54:36 2019
New Revision: 267684

URL: https://gcc.gnu.org/viewcvs?rev=267684&root=gcc&view=rev
Log:
        Backported from mainline
        2018-11-20  Jakub Jelinek  <jakub@redhat.com>

        PR tree-optimization/87895
        * omp-simd-clone.c (ipa_simd_modify_function_body): When removing
        or replacing GIMPLE_RETURN, set EDGE_FALLTHRU on the edge to EXIT.
        (simd_clone_adjust): Don't set EDGE_FALLTHRU here. In a loop that
        redirects edges to EXIT to edges to incr_bb, iterate while EXIT
        has any preds and always use EDGE_PRED (, 0).

        * gcc.dg/gomp/pr87895-1.c: New test.
        * gcc.dg/gomp/pr87895-2.c: New test.
        * gcc.dg/gomp/pr87895-3.c: New test.

Added:
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/gomp/pr87895-1.c
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/gomp/pr87895-2.c
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/gomp/pr87895-3.c
Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/omp-simd-clone.c
    branches/gcc-8-branch/gcc/testsuite/ChangeLog