[Bug target/104686] New: [12 Regression] Huge compile-time regression building SPEC 2017 538.imagick_r with -march=skylake

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104686

            Bug ID: 104686
           Summary: [12 Regression] Huge compile-time regression building
                    SPEC 2017 538.imagick_r with -march=skylake
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

We see a recent compile-time regression on 538.imagick_r for intel
architectures
(not reproducible with -march=znver2):

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=32.507.8

it happens on the magick/enhance.c file when building with -Ofast
-march=skylake

I will attach preprocessed source.