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Subject: [Bug tree-optimization/55022] New: [4.8 Regression] air.f90 is miscompliled with -m64 -O2 -fgraphite-identity after revision 190619
Date: Mon, 22 Oct 2012 13:53:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55022

             Bug #: 55022
           Summary: [4.8 Regression] air.f90 is miscompliled with -m64 -O2
                    -fgraphite-identity after revision 190619
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: grosser@gcc.gnu.org, rguenth@gcc.gnu.org


The test air.f90 is miscompliled with -m64 -O2 -fgraphite-identity after
revision 190619 (r188694 is OK):

...
  ITERATION#  TIME             FINAL          MASS RESIDUAL
        9    0.000045757110   0.01000000    0.597638
       17    0.000091473627   0.01000000    0.448609
       25    0.000137176442   0.01000000    0.608353
       33    0.000182824593   0.01000000    0.619686
       41    0.000228306169   0.01000000    0.628800
       49    0.000273480245   0.01000000    0.813862
       58    0.000323343055   0.01000000    1.026950
       67    0.000371631805   0.01000000    1.238993
       77    0.000422628642   0.01000000    1.474307
       88    0.000474256730   0.01000000    1.679987
      100    0.000524089193   0.01000000    1.789565
      114    0.000575138355   0.01000000    1.834548
      129    0.000625547555   0.01000000    1.945421
      144    0.000674419139   0.01000000    2.198194
      166    0.000728576510   0.01000000         NaN
      168  100.000735868323   0.01000000         NaN
 deltat, final t, iterations
   100.00000000000000        100.00073586832266              168
           9  0.59763770273003503     
          17  0.44860912267491976     
          25  0.60835306073381645     
          33  0.61968645389575716     
          41  0.62879989012582926     
          49  0.81386186515901682     
          58   1.0269501832675307     
          67   1.2389929088800784     
          77   1.4743070523641029     
          88   1.6799869908106582     
         100   1.7895645561305713     
         114   1.8345478482485826     
         129   1.9454206794378737     
         144   2.1981944269573130     
         166                       NaN
         168                       NaN

The miscompiled subroutines are botwall and topwall.