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Subject: [Bug tree-optimization/104582] [11/12 Regression] Unoptimal code for
 __negdi2 (and others) from libgcc2 due to unwanted vectorization
Date: Tue, 22 Feb 2022 07:59:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104582

--- Comment #21 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:90d693bdc9d71841f51d68826ffa5bd685d7f0bc

commit r12-7319-g90d693bdc9d71841f51d68826ffa5bd685d7f0bc
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Feb 18 14:32:14 2022 +0100

    target/99881 - x86 vector cost of CTOR from integer regs

    This uses the now passed SLP node to the vectorizer costing hook
    to adjust vector construction costs for the cost of moving an
    integer component from a GPR to a vector register when that's
    required for building a vector from components.  A cruical difference
    here is whether the component is loaded from memory or extracted
    from a vector register as in those cases no intermediate GPR is involve=
d.

    The pr99881.c testcase can be Un-XFAILed with this patch, the
    pr91446.c testcase now produces scalar code which looks superior
    to me so I've adjusted it as well.

    2022-02-18  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/104582
            PR target/99881
            * config/i386/i386.cc (ix86_vector_costs::add_stmt_cost):
            Cost GPR to vector register moves for integer vector constructi=
on.

            * gcc.dg/vect/costmodel/x86_64/costmodel-pr104582-1.c: New.
            * gcc.dg/vect/costmodel/x86_64/costmodel-pr104582-2.c: Likewise.
            * gcc.dg/vect/costmodel/x86_64/costmodel-pr104582-3.c: Likewise.
            * gcc.dg/vect/costmodel/x86_64/costmodel-pr104582-4.c: Likewise.
            * gcc.target/i386/pr99881.c: Un-XFAIL.
            * gcc.target/i386/pr91446.c: Adjust to not expect vectorization=
.=