[Bug target/116940] [15 Regression] wrong code with -O -mavx512vl and vector compare and negation since r15-1742

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116940

--- Comment #4 from GCC 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:21e2cd65add9070292313f8e12e8731d0aa2c869

commit r15-4400-g21e2cd65add9070292313f8e12e8731d0aa2c869
Author: liuhongt <hongtao....@intel.com>
Date:   Tue Oct 8 16:18:31 2024 +0800

    Don't lower vpcmpu to pcmpgt since the latter is for signed comparison.

    r15-1737-gb06a108f0fbffe lower AVX512 kmask comparison to AVX2 ones,
    but wrong lowered unsigned comparison to signed ones, for unsigned
    comparison, only EQ/NEQ can be lowered.

    The commit fix that.

    gcc/ChangeLog:

            PR target/116940
            * config/i386/sse.md (*avx2_pcmp<mode>3_7): Change
            UNSPEC_PCMP_ITER to UNSPEC_PCMP.
            (*avx2_pcmp<mode>3_8): New pre_reload
            define_insn_and_splitter.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr116940.c: New test.