[Bug middle-end/118691] New: [15 Regression] gcc_r in SPECCPU 2017 miscompare with PGO + LTO

[tnfchris at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118691

            Bug ID: 118691
           Summary: [15 Regression] gcc_r in SPECCPU 2017 miscompare with
                    PGO + LTO
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tnfchris at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64*

During the training part the run fails with:

200.c: In function 'htls_.clone.35':
200.c:26853:7: benchmark internal error: in ?, at fold-const.c:2677

during fdo1 with -mcpu=neoverse-v1 -Ofast -flto=auto

I'll bisect and reduce but this is a preliminary submission

This reappeared somewhere between
6e0b048fb5bc0809048ef8f487830ad26f4b87cf..9a4bb95a4e68b6f90a16f337b0b4cdb9af957ab1

But could have just been temporarily hidden.  Before that it was also failing
between
a7ae0c31245a7db7abf2e80d0016510afe9c8ad0..979ca3ba366da7177f427e049f67673ec3e35442