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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102058] 450.soplex regressed on x86_64 with
 -Ofast -march=generic (by 8-15%)
Date: Wed, 25 Aug 2021 10:00:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102058

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 51355
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51355&action=3Dedit
patch to add --param vect-emulated-gather for debugging

When using attached patch then 0 vs. 1 on zen2 indeed reproduces

                                  Estimated                       Estimated
                Base     Base       Base        Peak     Peak       Peak
Benchmarks      Ref.   Run Time     Ratio       Ref.   Run Time     Ratio
-------------- ------  ---------  ---------    ------  ---------  ---------
450.soplex       8340        120       69.5 *    8340        136       61.4=
 *=20=20

trying to nail it down now.=