linux-kernel - Re: [PATCH] drivers/video/fbdev/sis/sis_main.c: avoid repeated strlen() calls

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Message-ID: <557AA816.4060102@ti.com>
Date:	Fri, 12 Jun 2015 12:36:22 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Thomas Winischhofer <thomas@...ischhofer.net>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
CC:	<linux-fbdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/video/fbdev/sis/sis_main.c: avoid repeated strlen()
 calls



On 09/06/15 16:04, Rasmus Villemoes wrote:
> gcc is not smart enough to realize that strlen(strbuf1) cannot be
> changed by the loop body, so it is forced to recompute it, at least in
> the branch containing the assignment. Avoid this by using an
> equivalent stopping condition.

Does it matter? Is sisfb calling sisfb_search_mode thousands of times?

 Tomi


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