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] xtensa: Optimize "bitwise AND NOT with imm" followed by "branch if (not) equal to zero"
Date: Fri, 22 Jul 2022 12:29:18 -0700 [thread overview]
Message-ID: <CAMo8BfJVFx6ALvaXqRq5_eNb21oJXonv0y3MXK+7QUarbYpfrQ@mail.gmail.com> (raw)
In-Reply-To: <7b69b20d-784a-925c-52f4-32c2a6b18ab1@yahoo.co.jp>
On Fri, Jul 22, 2022 at 4:18 AM Takayuki 'January June' Suwa
<jjsuwa_sys3175@yahoo.co.jp> wrote:
>
> The RTL combiner will transform "if ((x & C) == C) goto label;"
> into "if ((~x & C) == 0) goto label;" and will try to match it with
> the insn patterns.
...
> gcc/ChangeLog:
>
> * config/xtensa/xtensa.md (*masktrue_const_bitcmpl):
> Add a new insn_and_split pattern, and a few split patterns for
> spacial cases.
> ---
> gcc/config/xtensa/xtensa.md | 84 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 84 insertions(+)
Regtested for target=xtensa-linux-uclibc, no new regressions.
Committed to master.
--
Thanks.
-- Max
prev parent reply other threads:[~2022-07-22 19:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-22 11:15 Takayuki 'January June' Suwa
2022-07-22 19:29 ` Max Filippov [this message]
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