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 2/2] xtensa: constantsynth: Add new 2-insns synthesis pattern
Date: Sun, 18 Jun 2023 21:21:33 -0700 [thread overview]
Message-ID: <CAMo8BfJaCHCvUVgO=j2FM5L9gQWMyJu4froMnaCQenP2_8vZXg@mail.gmail.com> (raw)
In-Reply-To: <cfbb27df-1afd-2dbc-ffc5-a5143f6ccd2d@yahoo.co.jp>
On Sun, Jun 18, 2023 at 12:10 AM Takayuki 'January June' Suwa
<jjsuwa_sys3175@yahoo.co.jp> wrote:
>
> This patch adds a new 2-instructions constant synthesis pattern:
>
> - A non-negative square value that root can fit into a signed 12-bit:
> => "MOVI(.N) Ax, simm12" + "MULL Ax, Ax, Ax"
>
> Due to the execution cost of the integer multiply instruction (MULL), this
> synthesis works only when the 32-bit Integer Multiply Option is configured
> and optimize for size is specified.
>
> gcc/ChangeLog:
>
> * config/xtensa/xtensa.cc (xtensa_constantsynth_2insn):
> Add new pattern for the abovementioned case.
> ---
> gcc/config/xtensa/xtensa.cc | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
Regtested for target=xtensa-linux-uclibc, no new regressions.
Committed to master.
--
Thanks.
-- Max
prev parent reply other threads:[~2023-06-19 4:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cfbb27df-1afd-2dbc-ffc5-a5143f6ccd2d.ref@yahoo.co.jp>
2023-06-18 7:09 ` Takayuki 'January June' Suwa
2023-06-19 4:21 ` Max Filippov [this message]
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