Author: Sune Fischer
Date: 12:57:51 09/13/02
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On September 13, 2002 at 14:36:21, Gerd Isenberg wrote: >On September 13, 2002 at 04:07:55, Sune Fischer wrote: > >>On September 12, 2002 at 21:19:08, Gerd Isenberg wrote: >> >>>Hi all, >>> >>>My first MMX-Routine (MSC inline asm) that gains considerable performance! >> >>Wow, that's great. How much faster do think it is? >> > >A loop of 100,000,000 * 2 calls with the two sample pathes take (XP2.1): > >C-Version with inlined shift 80 seconds >shlightly improved mmx version 56 seconds >10fold unrolled boolean mmx 35 seconds > >I find with paddb a nice replacement for left shift one (board right) with no >need to mask for byte-wraps. I notice you do a lookup into the table scBBOfBit. I found that doing the shift on the fly was a tiny bit faster, I imagine with MMX that the gain would be even larger, have you tried it? -S.
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