This may be of interest, 32x16 divide in 395 cycles:
http://cablemodem.fibertel.com.ar/at...C%20micros.htm
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This may be of interest, 32x16 divide in 395 cycles:
http://cablemodem.fibertel.com.ar/at...C%20micros.htm
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Aye lad...but alas, those routines are unsigned!Originally Posted by rmteo
This was all mainly an exercise on my part to see how stuff worked...turned out to do other stuff.
Mainly, the routine above was meant to replace the 32/32 signed divide routine in the pbppi18l.lib library. The regular PBP library treats all math as though it were 32 bit, even if the numbers are smaller. You don't gain much by optimizing adds, subtracts, and multiplies, but divides stand to gain quite a bit if the routines can differentiate between different size numbers and just to different, faster routines accordingly. The library adds about 100 bytes to the routine, but it's only 100 bytes once, not for every divide, and it could possibly shave a load of cycles off the routine.
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It was something I stumbled upon while browsing the MC forums. My signed 32x16 divide executes in 19 instruction cycles (what we talked about), hehe.
Ski, BTW, are you located across the pond
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Depends which side of the pond you are on to define if I am across the pond or not...It was something I stumbled upon while browsing the MC forums. My signed 32x16 divide executes in 19 instruction cycles (what we talked about), hehe.
Ski, BTW, are you located across the pond
Minot, N.D.
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Guess we are on the same side of the pond. Longmont, CO.
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