linux-kernel - Re: PATCH [0/3]: Simplify the kernel build by removing perl.

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Date:	Sat, 03 Jan 2009 18:39:27 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jamie Lokier <jamie@...reable.org>
CC:	Rob Landley <rob@...dley.net>,
	Leon Woestenberg <leon.woestenberg@...il.com>,
	Embedded Linux mailing list <linux-embedded@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: PATCH [0/3]: Simplify the kernel build by removing perl.

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.

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