[Bug tree-optimization/92283] New: [10 Regression] 454.calculix miscomparison since r276645 with -O2 -march=znver2

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92283

            Bug ID: 92283
           Summary: [10 Regression] 454.calculix miscomparison since
                    r276645 with -O2 -march=znver2
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---

Happens probably also on -march=znver1. The miscomparison looks as follows:

*** Miscompare of hyperviscoplastic.dat; for details see
   
/home/marxin/Programming/cpu2006/benchspec/CPU2006/454.calculix/run/run_peak_ref_amd64-m64-mine.0002/hyperviscoplastic.dat.mis
0004:      1  4.8405E-02  3.2704E-03 -9.0528E-02
           1  4.8406E-02  3.2744E-03 -9.0528E-02
                                   ^
0005:      2  4.7540E-02  4.7758E-03 -9.0477E-02
           2  4.7541E-02  4.7797E-03 -9.0476E-02
                                   ^
0006:      3  5.7701E-02  1.7385E-02 -8.9680E-02
           3  5.7701E-02  1.7389E-02 -8.9679E-02
                                   ^
0007:      4  5.8515E-02  1.6408E-02 -8.9846E-02
           4  5.8515E-02  1.6412E-02 -8.9845E-02
                                   ^
0008:      5  4.9013E-02  4.4863E-03 -7.1472E-02
           5  4.9013E-02  4.4890E-03 -7.1472E-02
                                   ^
0009:      6  4.8327E-02  6.3389E-03 -7.1369E-02
           6  4.8327E-02  6.3416E-03 -7.1368E-02
                                   ^
0010:      7  5.8090E-02  1.5335E-02 -6.9866E-02
           7  5.8091E-02  1.5337E-02 -6.9866E-02
                                   ^
0011:      8  5.8660E-02  1.4022E-02 -7.0121E-02
           8  5.8661E-02  1.4024E-02 -7.0120E-02
                                   ^
0012:      9  4.7972E-02  4.0228E-03 -9.0502E-02
           9  4.7973E-02  4.0267E-03 -9.0501E-02
                                   ^
0013:     10  5.2460E-02  1.1227E-02 -9.0329E-02
          10  5.2461E-02  1.1232E-02 -9.0328E-02
                                   ^


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)