[Bug tree-optimization/72772] Missed SCEV after pass reordering@236440

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72772

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Aug 11 09:02:04 2016
New Revision: 239357

URL: https://gcc.gnu.org/viewcvs?rev=239357&root=gcc&view=rev
Log:
2016-08-11  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/72772
        * cfgloopmanip.c (create_preheader): Use split_edge if there
        is a single loop entry, avoiding degenerate PHIs.

        * gcc.dg/graphite/pr35356-1.c: Adjust.
        * gcc.dg/tree-ssa/pr59597.c: Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfgloopmanip.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/graphite/pr35356-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr59597.c