[Bug tree-optimization/51683] [4.7 Regression] __builtin_memcpy etc. with constant first argument optimized away by ccp

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51683

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-12-31 
23:54:00 UTC ---
Author: jakub
Date: Sat Dec 31 23:53:57 2011
New Revision: 182761

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182761
Log:
    PR tree-optimization/51683
    * tree-ssa-propagate.c (substitute_and_fold): Don't optimize away
    calls with side-effects.
    * tree-ssa-ccp.c (ccp_fold_stmt): Likewise.

    * gcc.dg/pr51683.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr51683.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c
    trunk/gcc/tree-ssa-propagate.c