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



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?

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


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