linux-kernel - Re: [PATCH 11/23] make atomic_read() and atomic

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Message-ID: <20267.1187901648@turing-police.cc.vt.edu>
Date:	Thu, 23 Aug 2007 16:40:48 -0400
From:	Valdis.Kletnieks@...edu
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	"Robert P. J. Day" <rpjday@...dspring.com>,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	"Luck, Tony" <tony.luck@...el.com>, akpm@...ux-foundation.org,
	linux-arch@...r.kernel.org, Chris Snook <csnook@...hat.com>,
	Chris Friesen <cfriesen@...tel.com>
Subject: Re: [PATCH 11/23] make atomic_read() and atomic_set() behavior consistent on m32r

On Thu, 23 Aug 2007 21:29:41 +0200, Segher Boessenkool said:
> int f(atomic_t *x)
> {
>         return atomic_read(x) + atomic_read(x);
> }

>          ld r0,@r0
>          slli r0,#1
>          jmp lr

Looks like peephole optimization at work.

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