DOS ain't dead

Assembler optimisation - variant 3, sbb (Developers)

posted by ecm  , Düsseldorf, Germany, 14.05.2012, 18:22

> VARIANT 3:
> sub edx,ecx
> sbb eax,eax
> and eax,edx
> add ecx,eax

Oh yeah, I forgot about sbb for that.

> Difference between V2 and V3 is only borderly significant, maybe V3 is
> sligtly faster but measurement would be must done in pure DOS, not in Win98
> I am running just now.

Hmm, even if variant 3 is only a little faster or about equally fast, it's less code and makes the source easier to understand.

---
l

Complete thread:

• Assembler optimalisation - how to avoid a jump? - Laaca, 13.05.2012, 20:38 (Developers)
  • Assembler optimalisation - how to avoid a jump? - Rugxulo, 13.05.2012, 21:10
    • Assembler optimalisation - how to avoid a jump? - Laaca, 13.05.2012, 22:15
      • Assembler optimalisation - how to avoid a jump? - marcov, 13.05.2012, 23:22
  • Assembler optimisation - how to avoid a jump? - ecm, 13.05.2012, 23:32
    • Assembler optimisation - how to avoid a jump? - Laaca, 14.05.2012, 18:15
      • Assembler optimisation - variant 3, sbb - ecm, 14.05.2012, 18:22
      • Assembler optimisation - how to avoid a jump? - Rugxulo, 16.05.2012, 10:34
        • Assembler optimisation - how to avoid a jump? - bretjohn, 16.05.2012, 16:42
          • Assembler optimisation - speed, size, etc - ecm, 16.05.2012, 16:59