[Bug tree-optimization/33291] [4.3 Regression] a+=2; a+=2 not simplified to a+=4; with -O3 (ok with gcc-4.2.1)

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from rguenth at gcc dot gnu dot org  2007-09-04 08:39 -------
Subject: Bug 33291

Author: rguenth
Date: Tue Sep  4 08:38:56 2007
New Revision: 128068

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=128068
Log:
2007-09-04  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/33291
        * tree-pretty-print.c (dump_generic_node): Dump all
        qualifiers for pointer types, not only first.  Dump
        qualifiers for aggregate types as well.
        * tree-ssa-ccp.c (maybe_fold_offset_to_array_ref): Always
        use the canonical type for building ARRAY_REFs.
        * gimplify.c (canonicalize_addr_expr): Clean up.  The
        correct validness check is compatibility of the pointer
        types.  Always use the canonical type for building
        ARRAY_REFs and ADDR_EXPRs.
        * tree-ssa-forwprop.c (forward_propagate_addr_expr): Revert
        change that disabled propagation of ADDR_EXPRs into statements
        with volatile ops.

        * gcc.dg/volatile2.c: New testcase.
        * gcc.dg/pr32721.c: Adjust volatile reference pattern.
        * gcc.dg/tree-ssa/forwprop-1.c: Remove xfail.
        * gcc.dg/tree-ssa/forwprop-2.c: Likewise.
        * gcc.dg/tree-ssa/pr17141-1.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/volatile2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimplify.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/pr32721.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/forwprop-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/forwprop-2.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr17141-1.c
    trunk/gcc/tree-pretty-print.c
    trunk/gcc/tree-ssa-ccp.c
    trunk/gcc/tree-ssa-forwprop.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33291