[Bug tree-optimization/97139] New: [11 Regression] Miscompare of foreman_test_baseline_encodelog.out in 464.h264ref

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97139

            Bug ID: 97139
           Summary: [11 Regression] Miscompare of
                    foreman_test_baseline_encodelog.out in 464.h264ref
           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
            Blocks: 26163
  Target Milestone: ---

Since r11-3068-gfb51be60c8e7b697 the SPEC 2006 benchmark is miscompiled with:
-Ofast -march=znver2 -g -flto=128:

cat
/home/marxin/Programming/cpu2006/benchspec/CPU2006/464.h264ref/run/run_peak_test_amd64-m64-mine.0004/foreman_test_baseline_encodelog.out.mis
0015:  0000(IDR)   21952 0 28  37.383  41.260  42.850        0       0     FRM 
  99
       0000(IDR)   21960 0 28  37.383  41.260  42.850        0       0     FRM 
  99
                       ^
0046:     149400    21952    21952 
          149400    21960    21960 
                        ^
0047:     186750    21952    21952 
          186750    21960    21960 
                        ^
0048:     224100    21952    21952 
          224100    21960    21960 
                        ^
0049:     261450    21952    21952 
          261450    21960    21960 
                        ^
0050:     298800    21952    21952 
          298800    21960    21960 
                        ^
0051:     336150    21952    21952 
          336150    21960    21960 
                        ^
0052:     373500    21952    21952 
          373500    21960    21960 
                        ^
0053:     410850    21952    21952 
          410850    21960    21960 
                        ^
0076:   Total bits                        : 124680 (I 21952, P 102552, NVB 176) 
        Total bits                        : 124688 (I 21960, P 102552, NVB 176) 
                                                 ^


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)