[Bug tree-optimization/48702] [4.6/4.7 Regression] optimization regression with gcc-4.6 on x86_64-unknown-linux-gnu

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48702

--- Comment #27 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-26 
13:01:50 UTC ---
Author: rguenth
Date: Thu May 26 13:01:48 2011
New Revision: 174282

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=174282
Log:
2011-05-26  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/48702
    * tree-ssa-address.c (create_mem_ref_raw): Create MEM_REFs
    only when we know the base address is within bounds.
    * tree-ssa-alias.c (indirect_ref_may_alias_decl_p): Do not
    assume the base address of TARGET_MEM_REFs is in bounds.

    * gcc.dg/torture/pr48702.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr48702.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-address.c
    trunk/gcc/tree-ssa-alias.c