linux-kernel - Re: [PATCH v5 1/3] powerpc/bitops: Use immediate operand when possible

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Message-Id: <163888362384.3690807.10443788415015128934.b4-ty@ellerman.id.au>
Date:   Wed, 08 Dec 2021 00:27:03 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Segher Boessenkool <segher@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/3] powerpc/bitops: Use immediate operand when possible

On Tue, 21 Sep 2021 17:09:47 +0200, Christophe Leroy wrote:
> Today we get the following code generation for bitops like
> set or clear bit:
> 
> 	c0009fe0:	39 40 08 00 	li      r10,2048
> 	c0009fe4:	7c e0 40 28 	lwarx   r7,0,r8
> 	c0009fe8:	7c e7 53 78 	or      r7,r7,r10
> 	c0009fec:	7c e0 41 2d 	stwcx.  r7,0,r8
> 
> [...]

Applied to powerpc/next.

[1/3] powerpc/bitops: Use immediate operand when possible
      https://git.kernel.org/powerpc/c/fb350784d8d17952afa93383bb47aaa6b715c459
[2/3] powerpc/atomics: Use immediate operand when possible
      https://git.kernel.org/powerpc/c/41d65207de9fbff58acd8937a7c3f8940c186a87
[3/3] powerpc/atomics: Remove atomic_inc()/atomic_dec() and friends
      https://git.kernel.org/powerpc/c/f05cab0034babaa9b3dfaf6003ee6493496a8180

cheers