[Bug target/96891] [AVX512] For vector compare to dest vector, avx512 vector compare could be lowered to avx version

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96891

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:

https://gcc.gnu.org/g:ee78c20e74d30284fee36e22a64e86e45e676029

commit r11-6849-gee78c20e74d30284fee36e22a64e86e45e676029
Author: liuhongt <hongtao.liu@intel.com>
Date:   Fri Dec 18 15:56:06 2020 +0800

    Lower AVX512 vector comparison to AVX version when dest is vector.

    gcc/ChangeLog:

            PR target/96891
            PR target/98348
            * config/i386/sse.md (VI_128_256): New mode iterator.
            (*avx_cmp<mode>3_1, *avx_cmp<mode>3_2, *avx_cmp<mode>3_3,
             *avx_cmp<mode>3_4, *avx2_eq<mode>3, *avx2_pcmp<mode>3_1,
             *avx2_pcmp<mode>3_2, *avx2_gt<mode>3): New
            define_insn_and_split to lower avx512 vector comparison to avx
            version when dest is vector.
            (*<avx512>_cmp<mode>3,*<avx512>_cmp<mode>3,*<avx512>_ucmp<mode>3):
            define_insn_and_split for negating the comparison result.
            * config/i386/predicates.md (float_vector_all_ones_operand):
            New predicate.
            * config/i386/i386-expand.c (ix86_expand_sse_movcc): Use
            general NOT operator without UNSPEC_MASKOP.

    gcc/testsuite/ChangeLog:

            PR target/96891
            PR target/98348
            * gcc.target/i386/avx512bw-pr96891-1.c: New test.
            * gcc.target/i386/avx512f-pr96891-1.c: New test.
            * gcc.target/i386/avx512f-pr96891-2.c: New test.
            * gcc.target/i386/avx512f-pr96891-3.c: New test.
            * g++.target/i386/avx512f-pr96891-1.C: New test.
            * gcc.target/i386/bitwise_mask_op-3.c: Adjust testcase.