linux-kernel - Re: [RFC] div64

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Message-ID: <20070306222435.cbpv63ltximq6lrf@m.safari.iki.fi>
Date:	Wed, 7 Mar 2007 00:24:35 +0200
From:	Sami Farin <7atbggg02@...akemail.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC] div64_64 support

On Tue, Mar 06, 2007 at 23:53:49 +0200, Sami Farin wrote:
...
> And I found bug in gcc-4.1.2, it gave 0 for ncubic results
> when doing 1000 loops test... gcc-4.0.3 works.

Found it.

--- cbrt-test.c~	2007-03-07 00:20:54.735248105 +0200
+++ cbrt-test.c	2007-03-07 00:21:03.964864343 +0200
@@ -209,7 +209,7 @@
 
 	__asm__("bsrl %1,%0\n\t"
 		"cmovzl %2,%0"
-		: "=&r" (r) : "rm" (x), "rm" (-1));
+		: "=&r" (r) : "rm" (x), "rm" (-1) : "memory");
 	return r+1;
 }
 
Now Linux 2.6 does not have "memory" in fls, maybe it causes
some gcc funnies some people are seeing.

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