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Subject: [Bug target/104698] Inefficient code for DI to TI sign extend on
 power10
Date: Sat, 05 Mar 2022 05:03:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104698

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Michael Meissner <meissner@gcc.gnu.or=
g>:

https://gcc.gnu.org/g:1301d7f647c7ac40da7f910aa6e790205e34bb8b

commit r12-7501-g1301d7f647c7ac40da7f910aa6e790205e34bb8b
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Sat Mar 5 00:01:52 2022 -0500

    Optimize signed DImode -> TImode on power10.

    On power10, GCC tries to optimize the signed conversion from DImode to
    TImode by using the vextsd2q instruction.  However to generate this
    instruction, it would have to generate 3 direct moves (1 from the GPR
    registers to the altivec registers, and 2 from the altivec registers to
    the GPR register).

    This patch generates the shift right immediate instruction to do the
    conversion if the target/source registers ares GPR registers like it do=
es
    on earlier systems.  If the target/source registers are Altivec registe=
rs,
    it will generate the vextsd2q instruction.

    2022-03-05   Michael Meissner  <meissner@linux.ibm.com>

    gcc/
            PR target/104698
            * config/rs6000/vsx.md (UNSPEC_MTVSRD_DITI_W1): Delete.
            (mtvsrdd_diti_w1): Delete.
            (extendditi2): Convert from define_expand to
            define_insn_and_split.  Replace with code to deal with both GPR
            registers and with altivec registers.

    gcc/testsuite/
            PR target/104698
            * gcc.target/powerpc/pr104698-1.c: New test.
            * gcc.target/powerpc/pr104698-2.c: New test.=