Author: Ivan Tirado
Date: 09:52:15 05/17/98
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On May 17, 1998 at 06:11:31, Bo Persson wrote: [snip] >The problem with using MMX instructions is that they are not >yet supported by the compiler optimizer. I have tried using >inlined asm MMX-instructions with MSVC. The result was that >although the bitmap ops ran faster, the other instructions were >less well optimized by the compiler. Particularly register >allocations were a lot more conservative. This led to additional >load/store of variables, negating the effect of the MMX ops. > > >Bo Persson >bo.persson@mbox3.swipnet.se I see then. So, basically MMX becomes a liability because of poor/none compiler support. That's too bad, although I thought intel had provided an MMX compiler to promote its use. I just hope MSVC's next versions provides the necessary support, because, as I see it, this would be very significant in terms of speed. I think it would be very interesting to compare a P233MMX against a P2-233 using MMX in a chess program. How would they compare?
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