[Bug tree-optimization/34677] PREs insert_fake_stores is mostly useless

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

------- Comment #6 from rguenth at gcc dot gnu dot org  2008-03-10 17:15 -------
Subject: Bug 34677

Author: rguenth
Date: Mon Mar 10 17:14:45 2008
New Revision: 133081

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=133081
Log:
2008-03-10  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/34677
        * tree-ssa-pre.c (modify_expr_node_pool): Remove.
        (poolify_tree): Likewise.
        (modify_expr_template): Likewise.
        (poolify_modify_stmt): Likewise.
        (insert_fake_stores): Handle all component-ref style stores
        in addition to INDIRECT_REF.  Also handle complex types.
        Do not poolify the inserted load.
        (realify_fake_stores): Do not rebuild the tree but only
        make it a SSA_NAME copy.
        (init_pre): Remove initialzation of modify_expr_template.
        Do not allocate modify_expr_node_pool.
        (fini_pre): Do not free modify_expr_node_pool.

        * gcc.dg/tree-ssa/loadpre23.c: New testcase.
        * gcc.dg/tree-ssa/loadpre24.c: Likewise.
        * gcc.dg/tree-ssa/loadpre25.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/loadpre23.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/loadpre24.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/loadpre25.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34677