Re: [PATCH 3/4] xtensa: Make use of BALL/BNALL instructions

[Max Filippov <jcmvbkbc@gmail.com>]

On Sat, Jun 11, 2022 at 11:43 PM Takayuki 'January June' Suwa
<jjsuwa_sys3175@yahoo.co.jp> wrote:
>
> In Xtensa ISA, there is no single machine instruction that calculates unary
> bitwise negation, but a few similar fused instructions are exist:
>
>    "BALL  Ax, Ay, label"  // if ((~Ax & Ay) == 0) goto label;
>    "BNALL Ax, Ay, label"  // if ((~Ax & Ay) != 0) goto label;
>
> These instructions have never been emitted before, but it seems no
> reason not
> to make use of them.
>
> gcc/ChangeLog:
>
>         * config/xtensa/xtensa.md (*masktrue_bitcmpl): New insn pattern.
>
> gcc/testsuite/ChangeLog:
>
>         * gcc.target/xtensa/BALL-BNALL.c: New.
> ---
>   gcc/config/xtensa/xtensa.md                  | 21 +++++++++++++
>   gcc/testsuite/gcc.target/xtensa/BALL-BNALL.c | 33 ++++++++++++++++++++
>   2 files changed, 54 insertions(+)
>   create mode 100644 gcc/testsuite/gcc.target/xtensa/BALL-BNALL.c

Regtested for target=xtensa-linux-uclibc, no new regressions.
Committed to master.

-- 
Thanks.
-- Max