[Bug tree-optimization/91144] New: [10 regiression] 176.gcc miscompare after r273294

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91144

            Bug ID: 91144
           Summary: [10 regiression] 176.gcc miscompare after r273294
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wilco at gcc dot gnu.org
  Target Milestone: ---

Since r273294 SPEC2000 176.gcc fails with -O3 -DSPEC_CPU2000_LP64
-DSPEC_CPU2000_LINUX -std=gnu89: 

Running Benchmarks
  Running 176.gcc ref base ab default

*** Miscompare of scilab.s, see
/spec2000/benchspec/CINT2000/176.gcc/run/00000002/scilab.s.mis
*** Miscompare of 200.s, see
/spec2000/benchspec/CINT2000/176.gcc/run/00000002/200.s.mis
Error: 1x176.gcc

It passes when built with -O2 or with -fno-strict-aliasing.