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Subject: [Bug middle-end/101596] vect_recog_mulhs_pattern could use incorrect
 precision to check shift count
Date: Wed, 28 Jul 2021 03:40:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101596

--- Comment #4 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:89b3c97eed75c1e7c492bc727e0016003c5809cc

commit r12-2550-g89b3c97eed75c1e7c492bc727e0016003c5809cc
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Tue Jul 27 22:04:22 2021 -0500

    vect: Fix wrong check in vect_recog_mulhs_pattern [PR101596]

    As PR101596 showed, vect_recog_mulhs_pattern uses target_precision to
    check the scale_term is expected or not, it could be wrong when the
    precision of the actual used new_type larger than target_precision as
    shown by the example.

    This patch is to use precision of new_type instead of target_precision
    for the scale_term matching check.

    Bootstrapped & regtested on powerpc64le-linux-gnu P10,
    powerpc64-linux-gnu P8, x86_64-redhat-linux and aarch64-linux-gnu.

    gcc/ChangeLog:

            PR tree-optimization/101596
            * tree-vect-patterns.c (vect_recog_mulhs_pattern): Fix wrong ch=
eck
            by using new_type's precision instead.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/101596
            * gcc.target/powerpc/pr101596-1.c: New test.
            * gcc.target/powerpc/pr101596-2.c: Likewise.
            * gcc.target/powerpc/pr101596-3.c: Likewise.=