Author: Rafael Andrist
Date: 12:43:30 06/04/02
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On June 04, 2002 at 15:34:38, Sean Mintz wrote: >I think it'd be interesting to see if any speedup can be achieved by using these >data types. Can anyone run some tests to find out? It would seem to me that if >we can hold 64 bit values (using __m64) then we should see a 2x speedup in some >cases. Hope this helps some people. The problem is the conversion from/to MMX registers, which is unavoidable because several instructions are not available for MMX registers such as the bsf... and MMX instructions take usualy more cycles (at least on the processors I use). Therefor a 2x speedup would only be realistic for true 64bit machines. Rafael B. Andrist
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