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Subject: [Bug middle-end/103641] [11 regression] Severe compile time
 regression in SLP vectorize step
Date: Wed, 16 Mar 2022 08:22:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103641

--- Comment #35 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:b6950623cd13c98354b105d7210cc1cf6a284f3a

commit r11-9656-gb6950623cd13c98354b105d7210cc1cf6a284f3a
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Feb 4 09:26:57 2022 +0100

    tree-optimization/103641 - improve vect_synth_mult_by_constant

    The following happens to improve compile-time of the PR103641
    testcase on aarch64 significantly.  I did not investigate the
    effect on the generated code but at least in theory
    choose_mult_variant should do a better job when we tell it
    the actual mode we are going to use for the operations it
    synthesizes.

    2022-02-04  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/103641
            * tree-vect-patterns.c (vect_synth_mult_by_constant):
            Pass the vector mode to choose_mult_variant.

    (cherry picked from commit 876e70d4681332a600492173af0c7259e5a438c6)=