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  New VM performance improvements  (Read 15173 times)
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Offline Raghar

Junior Devvie




Ue ni taete 'ru hitomi ni kono mi wa dou utsuru


« Reply #90 - Posted 2005-02-05 22:25:28 »


I found this.
http://www.virtualdub.org/blog/pivot/entry.php?id=21

Of course Prescotts differs from previou CPUs be increased heat, and somewhat rewamped ALUs.


Bad latencies between SSE2 and rest of the CPU could make some algorithms faster on "general" purpose registers. Of course you could say this doesn't matter they will repair it in next generation, and add a lot of other problems.
Offline mumart

Junior Devvie


Medals: 1
Projects: 1


IBXM Java Music Player


« Reply #91 - Posted 2005-02-05 23:25:39 »

Quote
Operations on streams can be very cool too ( and subject to massive optimizations using MMX, 3DNow, SSE, SSE2, SSE3, etc ).

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void add( int value, int[] stream, int offset, int length );
void mul( float factor, float[] stream, int offset, int length );
void xor( short mask, short[] stream, int offset, int length );
void lshift( int amount, int[] stream, int offset, int length );
void clamp( byte lbound, byte ubound, byte[] stream, int offset, int length );
...


Ah yes, the wonderful MMX, where 1*1 = 0.5

I would love to be able to use SIMD from java, though.

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