The title says it all. I''m looking for assembler code, preferably using MMX optimisations (but not 3DNow!) that is a FAST SQRT function. Can anybody help? BTW, it doesn''t have to be exact, just very close.

I only know how to do square roots for floating point numbers in asm - however, assuming that you want to do dwords (words & qwords are also okay) , try something like this

  __asm {   fild    DWORD myVar   fsqrt   fistp   DWORD myResult}