Author: Larry Griffiths
Date: 20:29:42 01/15/01
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On January 15, 2001 at 20:15:17, Ralf Elvsén wrote: >I looked ay the instruction set for the Itanium processor. >As far as I could see there was no instruction to get the first/last >bit set. > >Can someone with insight in processor design describe the >considerations done by the designers when they decide to >include or to not include such an instruction? (Assuming they >are not chess programmers :) > >Is it possible to quantify how the "trouble" to include >it scales with the number of bits? I.e. is it even less likely >to be found in an 128-bit processor? > >Ralf I asked this question a while back. I think IA32 instructions might still be supported and maybe the BSF BSR instructions are still available. Maybe you can verify this. Larry.
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