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Subject: [Bug tree-optimization/54717] New: Runtime regression: polyhedron test "rnflow" degraded
Date: Wed, 26 Sep 2012 12:54:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54717

             Bug #: 54717
           Summary: Runtime regression: polyhedron test "rnflow" degraded
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sergos.gnu@gmail.com


commit 024fee2c369096e6fe6cde620243df5843893004
Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Sep 13 12:43:58 2012 +0000

    2012-09-13  Richard Guenther  <rguenther@suse.de>

        * tree-ssa-sccvn.h (enum vn_kind): New.
        (vn_get_stmt_kind): Likewise.
        * tree-ssa-sccvn.c (vn_get_stmt_kind): New function, adjust
        ADDR_EXPR handling.
        (visit_use): Use it.
        * tree-ssa-pre.c (compute_avail): Likewise, simplify further.

        * gcc.dg/tree-ssa/ssa-fre-37.c: New testcase.


    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191253
138bc75d-0d04-0410-961f-82ee72b054a4

caused a 20% degradation on polyhedron's "rnflow"

commit 780bedc1ccae5ae85fb99afed8a1ac1cc598121b
Geometric Mean Execution Time =      18.28 seconds

commit 024fee2c369096e6fe6cde620243df5843893004
Geometric Mean Execution Time =      24.82 seconds


compilation options used:
gfortran -march=native -ffast-math -funroll-loops -O3 -ftree-vectorize %n.f90
-static -o %n