[Bug rtl-optimization/84872] [8 Regression] ICE in create_preheader, at cfgloopmanip.c:1536

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84872

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Apr  6 17:28:02 2018
New Revision: 259182

URL: https://gcc.gnu.org/viewcvs?rev=259182&root=gcc&view=rev
Log:
        PR rtl-optimization/84872
        * cfgloopmanip.c (create_preheader): Use make_forwarder_block even if
        nentry == 1 when CP_FALLTHRU_PREHEADERS and single_entry is
        EDGE_CROSSING edge.

        * gcc.dg/graphite/pr84872.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/graphite/pr84872.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfgloopmanip.c
    trunk/gcc/testsuite/ChangeLog