From: Max Filippov <jcmvbkbc@gmail.com>
To: "Takayuki 'January June' Suwa" <jjsuwa_sys3175@yahoo.co.jp>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH 4/4] xtensa: Add clrsbsi2 insn pattern
Date: Thu, 9 Jun 2022 15:13:25 -0700 [thread overview]
Message-ID: <CAMo8BfJcb4uK3RD3Bqh2qhXwBQjwyXYDoSw_rmNLAL0VVycEzA@mail.gmail.com> (raw)
In-Reply-To: <0d69cc30-47f6-0bbd-c482-5a5c60a37252@yahoo.co.jp>
On Sun, May 29, 2022 at 4:00 AM Takayuki 'January June' Suwa
<jjsuwa_sys3175@yahoo.co.jp> wrote:
>
> > (clrsb:m x)
> > Represents the number of redundant leading sign bits in x, represented
> > as an integer of mode m, starting at the most significant bit position.
>
> This explanation is just what the NSA instruction (not ever emitted before)
> calculates in Xtensa ISA.
>
> gcc/ChangeLog:
>
> * config/xtensa/xtensa.md (clrsbsi2): New insn pattern.
>
> libgcc/ChangeLog:
>
> * config/xtensa/lib1funcs.S (__clrsbsi2): New function.
> * config/xtensa/t-xtensa (LIB1ASMFUNCS): Add _clrsbsi2.
> ---
> gcc/config/xtensa/xtensa.md | 12 +++++++++++-
> libgcc/config/xtensa/lib1funcs.S | 23 +++++++++++++++++++++++
> libgcc/config/xtensa/t-xtensa | 2 +-
> 3 files changed, 35 insertions(+), 2 deletions(-)
Regtested for target=xtensa-linux-uclibc, no new regressions.
Committed to master.
--
Thanks.
-- Max
prev parent reply other threads:[~2022-06-09 22:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-29 10:57 Takayuki 'January June' Suwa
2022-06-09 22:13 ` Max Filippov [this message]
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