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Subject: [Bug tree-optimization/45970] tree DSE misses many obvious dead stores
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45970

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-10-13 13:03:37 UTC ---
Author: rguenth
Date: Wed Oct 13 13:03:31 2010
New Revision: 165422

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=165422
Log:
2010-10-13  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/45970
    * tree-ssa-alias.h (stmt_kills_ref_p): Declare.
    * tree-ssa-alias.c (stmt_kills_ref_p_1): New function.
    (stmt_kills_ref_p): Likewise.
    * tree-ssa-dse.c (dse_optimize_stmt): Use it.

    * gcc.dg/tree-ssa/ssa-dse-13.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-13.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-alias.h
    trunk/gcc/tree-ssa-dse.c