Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755911AbZADCjw (ORCPT ); Sat, 3 Jan 2009 21:39:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751793AbZADCjm (ORCPT ); Sat, 3 Jan 2009 21:39:42 -0500 Received: from terminus.zytor.com ([198.137.202.10]:38701 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750870AbZADCjl (ORCPT ); Sat, 3 Jan 2009 21:39:41 -0500 Message-ID: <4960215F.8040804@zytor.com> Date: Sat, 03 Jan 2009 18:39:27 -0800 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Jamie Lokier CC: Rob Landley , Leon Woestenberg , Embedded Linux mailing list , linux-kernel@vger.kernel.org, Andrew Morton , Sam Ravnborg Subject: Re: PATCH [0/3]: Simplify the kernel build by removing perl. References: <200901020207.30359.rob@landley.net> <495FEEAF.5020005@zytor.com> <200901032006.47652.rob@landley.net> <20090104023609.GA20929@shareable.org> In-Reply-To: <20090104023609.GA20929@shareable.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1123 Lines: 32 Jamie Lokier wrote: > > Related query: > > Does the Perl script being replaced use 64-bit arithmetic? Because > many Perl installations only do 32-bit arithmetic. > > If the Perl version works in 32-bit arithmetic, why does the shell > version not do the same thing? > The Perl version uses Math::BigInt, a Perl standard module (with a canned-values fallback for ancient or minimal Perl installations) to do arbitrary precision arithmetic. The original version also produced constants that could be used with 64-bit values, but since gcc doesn't support 128-bit arithmetic on 32-bit platforms (gcc *does* support 128-bit arithmetic on 64-bit platforms) we didn't end up using it and removed them, although the code to generate them can still be activated. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/