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Subject: [Bug target/103772] [12 Regression] wrong code with -mavx512fp16
 since r12-5700-g7eb961d83b0eda53
Date: Mon, 20 Dec 2021 20:16:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103772

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Uros Bizjak <uros@gcc.gnu.org>:

https://gcc.gnu.org/g:72c68d7ad90221075102f08f22256d0b4a7631b3

commit r12-6081-g72c68d7ad90221075102f08f22256d0b4a7631b3
Author: Uros Bizjak <ubizjak@gmail.com>
Date:   Mon Dec 20 21:15:50 2021 +0100

    i386: Fix <sse2p4_1>_pinsr<ssemodesuffix> and its splitters [PR103772]

    The clever trick to duplicate the value of the input operand into itself
    proved not so clever after all.  The splitter should not clobber the in=
put
    operand in any case, since the register can hold the value outside the
HImode
    lowpart when accessed as subreg.  Use the standard earlyclobber approach
    instead.

    The testcase fails with avx2 ISA, but I was not able to create the test=
case
    that wouldn't require -mavx512fp16 compile flag.

    2021-12-20  Uro=C3=85=C2=A1 Bizjak  <ubizjak@gmail.com>

    gcc/ChangeLog:

            PR target/103772
            * config/i386/sse.md (<sse2p4_1>_pinsr<ssemodesuffix>): Add
            earlyclobber to (x,x,x,i) alternative.
            (<sse2p4_1>_pinsr<ssemodesuffix> peephole2): Remove.
            (<sse2p4_1>_pinsr<ssemodesuffix> splitter): Use output
            operand as a temporary register.  Split after reload_completed.=