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From: Ian Collins <ian-news@hotmail.com>
Newsgroups: comp.programming
Subject: Re: 64 bit code
Date: Thu, 11 Oct 2012 10:50:11 +1300
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On 10/11/12 09:52, BartC wrote:
>
> With the x86-64, it seems to be all or nothing: either run everything as
> 64-bits, or run in compatible 32-bit mode, where you don't have access to
> the extra, wider registers, nor to 64-bit arithmetic.

Which equates to a net loss of nothing and net gain of the 64 bit mode!

Now you have the ability to build and test 32 and 64 bit versions of 
your code to see which performs best.

-- 
Ian Collins