x86-64 on i386 (was Re: Promoting i386 version over x86_64?)

Paul Jakma paul at dishone.st
Sun Dec 13 18:34:58 UTC 2009

On Wed, 18 Nov 2009, Roland McGrath wrote:

> x86 is unlike other architectures because 64-bit also has twice as 
> many registers as 32-bit.  So you get to trade off the benefits of 
> register allocation across more registers against the memory/cache 
> footprint of 64-bit pointers.

For what percentage of code is that an appreciable advantage?

Paul Jakma	paul at jakma.org	Key ID: 64A2FF6A
 	"If he learns from his mistakes, pretty soon he'll know everything."

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