[Bug tree-optimization/101936] New: 538.imagick_r -Ofast regression Kabylake

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101936

            Bug ID: 101936
           Summary: 538.imagick_r -Ofast regression Kabylake
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          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: ---

When compiling with -Ofast -march=native, the benchmark is ~27% slower on
-march=skylake machine:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=32.507.0

I'm bisecting that right now on a Znver1 machine with -march=skylake set.


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)