[Bug tree-optimization/91071] New: [10 Regression] Miscompare of 410.bwaves since r272644

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91071

            Bug ID: 91071
           Summary: [10 Regression] Miscompare of 410.bwaves since r272644
           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
  Target Milestone: ---

Following is causing a problem:

$ runspec --config=spec2006 --size=train --iterations=1  --no-reportable
--action run --tune=peak 410.bwaves
(with -Ofast -march=skylake -g -flto=16 -fprofile-generate)

*** Miscompare of bwaves2.out; for details see
   
/home/marxin/Programming/cpu2006/benchspec/CPU2006/410.bwaves/run/run_peak_train_amd64-m64-mine.0000/bwaves2.out.mis

$ cat
/home/marxin/Programming/cpu2006/benchspec/CPU2006/410.bwaves/run/run_peak_train_amd64-m64-mine.0000/bwaves2.out.mis
0001:   294
                289
                  ^