🚀 go-pugleaf

In article <4451@cbnewsl.ATT.COM> afg@cbnewsl.ATT.COM (andrew.goldberg) writes:
>In article <6933@ucdavis.ucdavis.edu>, vmrad@pollux (Bernard Littau) writes:
>> In article <MARK.90Mar2090318@acsdev.uucp> mark@acsdev.uucp (Mark Grand) writes:
>> +In article <505@bilver.UUCP> alex@bilver.UUCP (Alex Matulich) writes:
>> +
>> +   Naturally, I wanted more speed, so I ported the program to an AT&T 386WGS
>> +   at work, which is a 25 MHz 80386 IBM compatible.  I compiled it using
>> +   Turbo C 2.0, large memory model.  Then I watched in chagrined disbelief as
>> +   that number-crunching section still took about a minute to execute --
>> +   actually a few seconds longer than my Amiga....
>
> Actually, to me it sounds like you need a 32-bit compiler for
> your 386. You are comparing an Amiga compiler that gets the most
> out of the 68000 with a PC compiler that was not intended for
> the 386. I use Microway's C compiler and see about a factor of
> two improvement.

There is also the Metaware HighC compilers which generate very
good FP code. Using Microway or Metaware on highly intensive math
stuff will generate much better speeds (even using the FP
emulator).

>
>	If you want more speed buy a Weitek chip, which the 
>	AT&T 6386/25 will accept.  The 25 MHz Weitek goes for about
>	$1300 and will give you another factor of 5 or so, if
>	you do not use transcendental functions.  The Microway
>	C compiler, among others, supports the Weitek.

Thanks for the mention Andy. BTW if anybody reading this is developing
commercial products, call Weitek for information regarding our developer
program. It offers significant discounts on products. {end of commercial}

Again, don't forget Metaware... >>

>> single to double, doing the calculation in double, and converting back
>> to single.  
>
>		?huh? While your comments about single vs. double are
>		right on the money, what's all this about C being a "poor

Wellll.... except that both Microway and Metaware give you ways to 
prohibit the float promotion or use the ANSI control of what gets
promoted to doubles. Most of the CAD/CAM people in the DOS world are
now using one of these two compilers.


>
>		Andy Goldberg


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