[Bug tree-optimization/92558] New: [10 Regression] Miscompare of 554.roms_r with -Ofast -march=znver2 -flto since r278289

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92558

            Bug ID: 92558
           Summary: [10 Regression] Miscompare of 554.roms_r with -Ofast
                    -march=znver2 -flto since r278289
           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: ---

I see the following miscompare with test size:

Error with '/home/marxin/Programming/cpu2017/bin/specinvoke -d
/home/marxin/Programming/cpu2017/benchspec/CPU/554.roms_r/run/run_peak_test_gcc7-m64.0000
-f compare.cmd -E -e compare.err -o compare.stdout'; no non-empty output files
exist
  Command returned exit code 1
*** Miscompare of ocean_benchmark0.log; for details see
   
/home/marxin/Programming/cpu2017/benchspec/CPU/554.roms_r/run/run_peak_test_gcc7-m64.0000/ocean_benchmark0.log.mis
Error: 1x554.roms_r
Producing Raw Reports
 label: gcc7-m64
  workload: test
   metric: SPECrate2017_fp_peak
    format: raw ->
/home/marxin/Programming/cpu2017/result/CPU2017.023.fprate.test.rsf

I'm going to isolate that more..


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)