linux-kernel - Re: Is there any word about this bug in gcc ?

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Message-Id: <20071119.221710.241875586.davem@davemloft.net>
Date:	Mon, 19 Nov 2007 22:17:10 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	xiyou.wangcong@...il.com
Cc:	hpa@...or.com, goodmenkernel@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: Is there any word about this bug in gcc ?

From: WANG Cong <xiyou.wangcong@...il.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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