[Bug tree-optimization/38885] missed FRE with BIT_FIELD_REF and vectors

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38885

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-10-05 
14:35:22 UTC ---
Author: rguenth
Date: Wed Oct  5 14:35:15 2011
New Revision: 179556

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179556
Log:
2011-10-05  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/38885
    * tree-ssa-sccvn.c (vn_reference_lookup_3): Handle partial reads
    from constants.

    * gcc.dg/tree-ssa/ssa-fre-33.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-33.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c