[Bug tree-optimization/51760] [4.7 Regression] ICE in set_lattice_value, at tree-ssa-ccp.c:456

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51760

--- Comment #8 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-05 13:41:38 UTC ---
Author: rguenth
Date: Thu Jan  5 13:41:34 2012
New Revision: 182909

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182909
Log:
2012-01-05  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/51760
    * tree-ssa-ccp.c (likely_value): Drop UNDEFINED to CONSTANT,
    not VARYING.
    (bit_value_unop): Handle UNDEFINED operands.
    (bit_value_binop): Likewise.

    * gcc.dg/torture/pr51760.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr51760.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c