Re: ****Re: ****Re: ****Re: ****What's up with 64 bit Linux

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Author: Jon M. Hanson
Date:  
To: Main PLUG discussion list
Subject: Re: ****Re: ****Re: ****Re: ****What's up with 64 bit Linux
Chris Gehlker wrote:
> In the Intel world, the data path isn't wider between i386 and
> ix86-64. There are more registers, but compilers haven't really been
> optimized to use them yet. But even when they are, one cache miss will
> wipe out the gains from running hundreds of instructions with more
> registers.
>

This isn't true at all. If you're running in x86-64 and something has
been compiled as x86-64 you will absolutely use the additional
registers. Compilers (at least GCC and Intel's compiler, I can't speak
for Microsoft's) have supported x86-64 for quite a while now.

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