[Bug middle-end/38533] [4.2/4.3/4.4 regression] tree-ssa-reassoc.c increases register pressure several times

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

------- Comment #7 from jakub at gcc dot gnu dot org  2008-12-18 07:56 -------
Subject: Bug 38533

Author: jakub
Date: Thu Dec 18 07:54:43 2008
New Revision: 142807

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=142807
Log:
        PR middle-end/38533
        * tree-ssa-reassoc.c (remove_visited_stmt_chain): New function.
        (rewrite_expr_tree): Add moved argument, move stmts together if
        needed.  Call remove_visited_stmt_chain.
        (linearize_expr_tree): Don't move stmts here.
        (reassociate_bb): Call remove_visited_stmt_chain if num ops is 1.
        Adjust rewrite_expr_tree caller.

        * gcc.dg/tree-ssa/pr38533.c: New test.
        * gcc.c-torture/execute/pr38533.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr38533.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr38533.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-reassoc.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38533