Date: Mon, 19 Nov 2007 22:17:10 -0800 (PST)
Message-Id: <20071119.221710.241875586.davem@davemloft.net>
To: xiyou.wangcong@gmail.com
Cc: hpa@zytor.com, goodmenkernel@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: Is there any word about this bug in gcc ?
From: David Miller <davem@davemloft.net>
In-Reply-To: <20071120053904.GG2472@hacking>
References: <20071120041600.GC2472@hacking>
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	<20071120053904.GG2472@hacking>
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From: WANG Cong <xiyou.wangcong@gmail.com>
Date: Tue, 20 Nov 2007 13:39:05 +0800

> And you mean abs() is not in glibc, then where is it? Built in gcc?
> And what's more, why not put it in glibc?

Because the compiler knows things about the inputs and can
thus apply optimizations that a static implementation in glibc
that has to handle all forms of inputs cannot.
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