Emulating a hardware signed multiplier

Torbjorn Granlund tg at gmplib.org
Sun Oct 25 10:52:01 CET 2009

Børge Strand-Bergesen <borge.strand at gmail.com> writes:

  Hi Torbjörn,
  I came to the same conclusion. I'll have a go at it after our
  one-year-old is put to bed tonight :-)
  I'll use GMP for other purposes than this, so I guess I'll rather
  spend time tweaking it than learning the correct X86 assembly
  instructions and their interface. Not state of the art programming, I
  know, but it's probably what gets me there in the least (human) time.
Also, the 64 x 64 -> 128 bit multiply is not available under Windos XP,
I think.  You need a 64-bit OS that puts the processor in 64-bit mode to
use that.


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