linux-kernel - Re: [PATCH] TRACING: Fix a copmile warning

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Message-ID: <1311642766.3526.60.camel@gandalf.stny.rr.com>
Date:	Mon, 25 Jul 2011 21:12:46 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arnaud Lacombe <lacombar@...il.com>
Cc:	Ian Lance Taylor <iant@...gle.com>, gcc-help@....gnu.org,
	stufever@...il.com, linux-kernel@...r.kernel.org,
	Wang Shaoyan <wangshaoyan.pt@...bao.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] TRACING: Fix a copmile warning

On Mon, 2011-07-25 at 21:08 -0400, Arnaud Lacombe wrote:
> Hi,
> 

> but the code generated seem to test %esi (`b', potentially
> uninitialized) before %ebx (`a'). Am I still missing something ?

But it tests 'a' again afterward. If 'a' is 0, it doesn't matter what
'b' was. So the uninitialized test is a wash. No harm done, except for
some wasted CPU cycles.

-- Steve


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