[Bug tree-optimization/121372] New: miscompilation in OpenBLAS since PR79958

Sat, 02 Aug 2025 03:42:17 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121372

            Bug ID: 121372
           Summary: miscompilation in OpenBLAS since PR79958
           Product: gcc
           Version: 15.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dan at danny dot cz
  Target Milestone: ---

We have noticed a test failure in OpenBLAS on ppc64le (originally in Fedora)
after switching to gcc 15. It has been tracked down to
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=1e0ae1f52741f7e0133661659ed2d210f939a398
and incorrect DSE in
https://github.com/OpenMathLib/OpenBLAS/blob/develop/kernel/power/dgemv_n.c

Please see full details in https://github.com/OpenMathLib/OpenBLAS/issues/5372

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