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Subject: [Bug target/98694] [11 Regression] GCC produces incorrect code for
 loops with -O3 for skylake-avx512 and icelake-server
Date: Thu, 21 Jan 2021 05:30:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98694

--- Comment #8 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:e711b67a9081ae84c66174a50705dc98ba993a43

commit r11-6828-ge711b67a9081ae84c66174a50705dc98ba993a43
Author: liuhongt <hongtao.liu@intel.com>
Date:   Mon Jan 18 16:55:32 2021 +0800

    Fix incorrect optimization by cprop_hardreg.

    If SRC had been assigned a mode narrower than the copy, we can't
    always link DEST into the chain even they have same
    hard_regno_nregs(i.e. HImode/SImode in i386 backend).

    i.e
            kmovw   %k0, %edi
            vmovd   %edi, %xmm2
            vpshuflw        $0, %xmm2, %xmm0
            kmovw   %k0, %r8d
            kmovd   %k0, %r9d
    ...
    -        movl %r9d, %r11d
    +        vmovd %xmm2, %r11d

    gcc/ChangeLog:

            PR rtl-optimization/98694
            * regcprop.c (copy_value): If SRC had been assigned a mode
            narrower than the copy, we can't link DEST into the chain even
            they have same hard_regno_nregs(i.e. HImode/SImode in i386
            backend).

    gcc/testsuite/ChangeLog:

            PR rtl-optimization/98694
            * gcc.target/i386/pr98694.c: New test.=