[Bug target/39821] 120% slowdown with vectorizer

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39821

--- Comment #10 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:231bcc77b953406b8381c7f55a3ec181da67d1e7

commit r12-2586-g231bcc77b953406b8381c7f55a3ec181da67d1e7
Author: liuhongt <hongtao....@intel.com>
Date:   Wed Jul 28 16:24:52 2021 +0800

    Add a separate function to calculate cost for WIDEN_MULT_EXPR.

    gcc/ChangeLog:

            PR target/39821
            * config/i386/i386.c (ix86_widen_mult_cost): New function.
            (ix86_add_stmt_cost): Use ix86_widen_mult_cost for
            WIDEN_MULT_EXPR.

    gcc/testsuite/ChangeLog:

            PR target/39821
            * gcc.target/i386/sse2-pr39821.c: New test.
            * gcc.target/i386/sse4-pr39821.c: New test.