[Bug target/101908] [12 regression] cray regression with -O2 -ftree-slp-vectorize compared to -O2

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101908

--- Comment #48 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>:

https://gcc.gnu.org/g:e3174d6183e5c042e822d9feabb670235b737441

commit r12-7990-ge3174d6183e5c042e822d9feabb670235b737441
Author: liuhongt <hongtao....@intel.com>
Date:   Wed Mar 30 20:35:55 2022 +0800

    Split vector load from parm_del to elemental loads to avoid STLF stalls.

    Since cfg is freed before machine_reorg, just do a rough calculation
    of the window according to the layout.
    Also according to an experiment on CLX, set window size to 64.

    Currently only handle V2DFmode load since it doesn't need any scratch
    registers, and it's sufficient to recover cray performance for -O2
    compared to GCC11.

    gcc/ChangeLog:

            PR target/101908
            * config/i386/i386.cc (ix86_split_stlf_stall_load): New
            function
            (ix86_reorg): Call ix86_split_stlf_stall_load.
            * config/i386/i386.opt (-param=x86-stlf-window-ninsns=): New
            param.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr101908-1.c: New test.
            * gcc.target/i386/pr101908-2.c: New test.
            * gcc.target/i386/pr101908-3.c: New test.