[Bug tree-optimization/27090] FRE does not look past previous type casts

rguenth at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Thu May 4 13:57:00 GMT 2006



------- Comment #10 from rguenth at gcc dot gnu dot org  2006-05-04 13:57 -------
Subject: Bug 27090

Author: rguenth
Date: Thu May  4 13:56:52 2006
New Revision: 113527

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=113527
Log:
2006-05-04  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/14287
        PR tree-optimization/14844
        PR tree-optimization/19792
        PR tree-optimization/21608
        PR tree-optimization/27090
        * tree-ssa-pre.c (try_combine_conversion): New function.
        (compute_avail): After constructing the value-handle
        expression, use try_combine_conversion to combine NOP_EXPRs
        with previous value-handle expressions and use the result if it
        is available.

        * gcc.dg/tree-ssa/ssa-fre-1.c: New testcase.
        * gcc.dg/tree-ssa/ssa-fre-2.c: Likewise.
        * gcc.dg/tree-ssa/ssa-fre-3.c: Likewise.
        * gcc.dg/tree-ssa/ssa-fre-4.c: Likewise.
        * gcc.dg/tree-ssa/ssa-fre-5.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-2.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-3.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-4.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-5.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27090



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