From owner-freebsd-current@FreeBSD.ORG  Wed Sep 29 19:35:07 2010
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 2ED2F1065672;
	Wed, 29 Sep 2010 19:35:07 +0000 (UTC) (envelope-from dim@FreeBSD.org)
Received: from tensor.andric.com (cl-327.ede-01.nl.sixxs.net
	[IPv6:2001:7b8:2ff:146::2])
	by mx1.freebsd.org (Postfix) with ESMTP id D32248FC08;
	Wed, 29 Sep 2010 19:35:06 +0000 (UTC)
Received: from [IPv6:2001:7b8:3a7:0:20e5:f9f9:5cd3:9694] (unknown
	[IPv6:2001:7b8:3a7:0:20e5:f9f9:5cd3:9694])
	(using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits))
	(No client certificate requested)
	by tensor.andric.com (Postfix) with ESMTPSA id 197145C43;
	Wed, 29 Sep 2010 21:35:06 +0200 (CEST)
Message-ID: <4CA394EB.7090902@FreeBSD.org>
Date: Wed, 29 Sep 2010 21:35:07 +0200
From: Dimitry Andric <dim@FreeBSD.org>
Organization: The FreeBSD Project
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US;
	rv:1.9.2.11pre) Gecko/20100928 Lanikai/3.1.5pre
MIME-Version: 1.0
To: Renato Botelho <rbgarga@gmail.com>
References: <4C99A53E.7060707@FreeBSD.org>
	<AANLkTimYj1VnVQBLROE94rqPYO7pQyHWfpjiYYZ2ORrX@mail.gmail.com>
	<AANLkTikm0FrJbOTiRPQhcqM30N-GyOYRBk_8jR-Gq9jF@mail.gmail.com>
	<20100929002843.GA5001@oriental.arm.org>
	<4CA2E00D.3080102@FreeBSD.org>
	<AANLkTik4k+g8NGwRUp=7bvF2MiHhbBOHmA=Ree_-xRDT@mail.gmail.com>
	<4CA3244D.7030907@FreeBSD.org>
	<20100929155659.GA82433@oriental.arm.org>
	<20100929173158.GA73653@freebsd.org>
	<AANLkTi=6n0+EYsXT5aG_mjFmTK=fUYhwptvW+n4zQMOK@mail.gmail.com>
	<20100929174434.GA75072@freebsd.org>
	<AANLkTikPFi3gjXHGzq3hFBSBzA0j+WsOAHM-d8SYNWuD@mail.gmail.com>
In-Reply-To: <AANLkTikPFi3gjXHGzq3hFBSBzA0j+WsOAHM-d8SYNWuD@mail.gmail.com>
Content-Type: multipart/mixed; boundary="------------090609020204040609070302"
Cc: Roman Divacky <rdivacky@freebsd.org>, Derek Tattersall <dlt@mebtel.net>,
	current@freebsd.org
Subject: Re: Clang now builds world and kernel, on i386 and amd64
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 29 Sep 2010 19:35:07 -0000

This is a multi-part message in MIME format.
--------------090609020204040609070302
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

On 2010-09-29 20:22, Renato Botelho wrote:
> It's using drand48() instead of rand()
...
> GCC libc:
> garga@botelhor:~/testes>  ./test
> random value 0.396465
>
> clang libc:
> garga@botelhor:~/testes>  ./test
> random value -inf

Renato, Derek, could you please apply the attached patch for ldexp,
rebuild your libc (with clang), and run your random test program again?

--------------090609020204040609070302
Content-Type: text/plain;
 name="ldexp-amd64.diff"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="ldexp-amd64.diff"

diff --git a/lib/libc/amd64/gen/ldexp.c b/lib/libc/amd64/gen/ldexp.c
index 43107fc..ecf1ff8 100644
--- a/lib/libc/amd64/gen/ldexp.c
+++ b/lib/libc/amd64/gen/ldexp.c
@@ -36,6 +36,8 @@ static char sccsid[] = "@(#)ldexp.c	8.1 (Berkeley) 6/4/93";
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include <math.h>
+
 /*
  * ldexp(value, exp): return value * (2 ** exp).
  *
@@ -49,12 +51,16 @@ __FBSDID("$FreeBSD$");
 double
 ldexp (double value, int exp)
 {
-	double temp, texp, temp2;
+	double temp, texp;
+#ifdef __clang__
+	volatile
+#endif
+	double temp2;
 	texp = exp;
 #ifdef __GNUC__
 	__asm ("fscale "
-		: "=u" (temp2), "=t" (temp)
-		: "0" (texp), "1" (value));
+		: "=t" (temp), "=u" (temp2)
+		: "0" (value), "1" (texp));
 #else
 #error unknown asm
 #endif

--------------090609020204040609070302--