[Bug tree-optimization/50769] [4.7 Regression] ICE: in phi_alternatives_equal, at tree-cfgcleanup.c:355 with -O2 -fno-delete-null-pointer-checks -fno-guess-branch-probability -fipa-pta

[vries at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50769

--- Comment #4 from vries at gcc dot gnu.org 2011-10-19 16:29:52 UTC ---
Author: vries
Date: Wed Oct 19 16:29:42 2011
New Revision: 180197

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180197
Log:
2011-10-19  Tom de Vries  <tom@codesourcery.com>

    PR tree-optimization/50769
    * tree-ssa-tail-merge.c (replace_block_by): Calculate phi_vuse2
    unconditionally.  Handle case that phi_vuse2 is not an SSA_NAME.  Add
    dummy argument .MEM to phi when increasing number of arguments of phi by
    redirecting edges to the block with phi.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-tail-merge.c