Bug ID: 84201
           Summary: 549.fotonik3d_r from SPEC2017 fails verification with
                    -mprefer-vector-width=256 or 512 on Zen
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot
          Reporter: jamborm at gcc dot
  Target Milestone: ---

I'm not sure if I can post any more details than what the subject
says. On AMD EPYC and Ryzen machines (at least), 549.fotonik3d_r from
SPEC 2017 fails with a verification error when compiled with any of
the following combination of options:

  -Ofast -g -march=native -mtune=native -mprefer-vector-width=256

  -Ofast -g -march=native -mtune=native -mprefer-vector-width=512

Unfortunately, it does not fail the test run but only the reference

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