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Old 2007-10-25, 13:56   #1
Cruelty
 
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Default LLR performance on Core1 / Pentium M

I have just noticed that running LLR on Core1 / Pentium M hardware is more efficient with CpuSupportsSSE2=0 than with default SSE2 enabled. In my particular example for k*2^n-1, where k<300 and n~600000 time to complete every candidate is 1730s (SSE2) vs. 1580s (no SSE2) - 8,7% improvement.
I wonder if the same rule applies to A64 architecture?
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Old 2007-10-25, 14:28   #2
axn
 
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Perhaps this thread might give you a clue. That testing was done only for the non-base-2 generic FFTs -- not the IBDWT that LLR uses for k*2^n-1 numbers. However, I suspect that the results might follow the same pattern for that also.
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Old 2007-10-25, 15:08   #3
Cruelty
 
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So it works only on Core1 and Pentium M I guess

Last fiddled with by Cruelty on 2007-10-25 at 15:08
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