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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/110625] [AArch64] Vect: SLP fails to vectorize a loop as
 the reduction_latency calculated by new costs is too large
Date: Mon, 31 Jul 2023 12:56:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110625

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Hao Liu <hliu@gcc.gnu.org>:

https://gcc.gnu.org/g:bf67bf4880ce5be0b6e48c7c35828528b7be12ed

commit r14-2877-gbf67bf4880ce5be0b6e48c7c35828528b7be12ed
Author: Hao Liu <hliu@os.amperecomputing.com>
Date:   Mon Jul 31 20:53:37 2023 +0800

    AArch64: Do not increase the vect reduction latency by multiplying count
[PR110625]

    The new costs should only count reduction latency by multiplying count =
for
    single_defuse_cycle.  For other situations, this will increase the
reduction
    latency a lot and miss vectorization opportunities.

    Tested on aarch64-linux-gnu.

    gcc/ChangeLog:

            PR target/110625
            * config/aarch64/aarch64.cc (count_ops): Only '* count' for
            single_defuse_cycle while counting reduction_latency.

    gcc/testsuite/ChangeLog:

            * gcc.target/aarch64/pr110625_1.c: New testcase.
            * gcc.target/aarch64/pr110625_2.c: New testcase.=