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Subject: [Bug rtl-optimization/100328] IRA doesn't model matching constraint
 well
Date: Tue, 06 Jul 2021 02:35:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100328

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:

https://gcc.gnu.org/g:c64d15224c6dc4dc3b6b3c2c6b6fd5c7e0e9c072

commit r12-2046-gc64d15224c6dc4dc3b6b3c2c6b6fd5c7e0e9c072
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Mon Jul 5 20:54:16 2021 -0500

    i386: Disable param ira-consider-dup-in-all-alts [PR100328]

    With Hongtao's SPEC2017 performance evaluation result here:
    https://gcc.gnu.org/pipermail/gcc-patches/2021-June/573986.html
    this new parameter ira-consider-dup-in-all-alts has negative
    effects on i386, this patch is to disable it explicitly on
    i386.

    Bootstrapped & regtested on x86_64-redhat-linux.

    gcc/ChangeLog:

            PR rtl-optimization/100328
            * config/i386/i386-options.c (ix86_option_override_internal):
            Set param_ira_consider_dup_in_all_alts to 0.=