Author: Brian Richardson
Date: 07:00:47 09/17/99
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On September 16, 1999 at 17:07:08, J. Wesley Cleveland wrote: >On September 15, 1999 at 16:57:30, Brian Richardson wrote: > >>I have looked at Intel's IA64 architecture guide and can't find these >>instructions, although there is a popcnt. Am I missing something? > >There is a Compute Zero Index, which would allow you to do it in 3 instructions. I saw the czx instructions, but they find the first zero byte (or 2 bytes). How would you use czx to find the first non-zero element? Also, seems like table lookup would still be needed to find the first/last bit set?
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