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Re: your mail

To: linux-mips@linux-mips.org
Subject: Re: your mail
From: Greg Lindahl <lindahl@keyresearch.com>
Date: Thu, 17 Apr 2003 13:15:03 -0700
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On Thu, Apr 17, 2003 at 11:17:10AM -0700, Jun Sun wrote:

> It really depends on the applications.  The biggest gain from 64bit,
> other than the obviously bigger address space, is 64bit data
> manipulation.  A single 64bit instruction (add/sub/...) is carried
> out by several instructions in 32bit.

A big gain is the increased # of registers and better calling
sequence. Everyone sees that, not just people who want to use 64-bit
integers. At the moment you need to run the 64-bit kernel -- and the
new binutils & glibc -- in order to get n32 programs to work.

-- greg


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