Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software

Jim Leonard trixter at oldskool.org
Mon Dec 12 17:40:58 CST 2005


Eric J Korpela wrote:
>>I was always a little disappointed that the 8087 didn't speed up integer
>>math
>>any (FDIV was at least 193 cycles, whereas DIV is never more than 162)...
>>I
>>could have really used that.
> 
> It speeds up 32 bit and 64 bit integer math.....

On 8088, not 32-bit; see my previous message for timings.  64-bit, yes.

> Even on newer processors it was floating point was useful for many non-FP
> things.  Desipte intel's documentation to the contrary, the fastest block
> transfer loop on the (pre-MMX) Pentium was done using FILDQ-FISTPQ.

Ah yes, I almost crapped a brick when I found that out!
-- 
Jim Leonard (trixter at oldskool.org)                    http://www.oldskool.org/
Want to help an ambitious games project?             http://www.mobygames.com/
Or check out some trippy MindCandy at             http://www.mindcandydvd.com/



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