Re: Sizeof long and int for 64 bit OS
From: Måns Rullgård (mru_at_inprovide.com)
Date: 05/20/05
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Date: Fri, 20 May 2005 16:03:36 +0200
Mikko Rauhala <mjr@iki.fi> writes:
> On Fri, 20 May 2005 12:56:48 +0000 (UTC), Victor Wagner <vitus@45.free.net>
> wrote:
>> Not only. Typically, on most modern architectures most utilities run a
>> bit faster an consume less memory if compiled 32-bit.
>
> Yep, this is true. However, as the architecture is quickly gaining
> popularity, I deem it useful to add that on amd64 spesifically this
> isn't generally quite true (well, for the speed part anyway).
>
> Of course, this is mostly due to there being more general purpose
> registers available in 64-bit mode on that architecture and not any
> "64-bit magic" which seems to govern marketing.
The amd64 32-bit mode is an emulation of an old 32-bit x86 CPU,
including all its deficiencies. The 32-bit mode available on some
other machines is only limiting the address space, while still
providing full 64-bit math etc.
-- Måns Rullgård mru@inprovide.com
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