New Saturn asm "add loop" benchmark for the HP48G

[Jonathan Busby]

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WARNING : The first attachment, addloop-0.01b.zip, has a bugged ISR
in addloop and corrupts system time. These problems have been
corrected in version 0.02a . If you run 0.01b, it won't crash your calc ( at
least I don't think ), but it *can* generate bogus results.
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Please reference this thread for a list of other implementations.

I just recently wrote a new implementation of pier4r's "add loop" benchmark for the HP48G series.

The code overrides the interrupt system, sets TIMER2 for a 60-second countdown, and then executes :

( The following further optimized add loop was provided by Werner )

Code:

        P=      5
        C=0     W
l1      C=C+1   A
        GONC    l1
        C=C+1   P
        GONC    l1

The count I get is :

4383185

Not as much of a speedup as I had thought previous to coding this benchmark.

Note that the code, just due to my laziness, *cannot* be run on an HP48GX with a merged RAM card -- this limitation can be fixed with a =MOVEDOWN to ADISP. Also, and this is very important :

**Due to the nature of how the code reconfigures IRAM, this code is only known to work on HP48G/GX/G+ version R ROM models**

Have fun!

Jonathan

EDIT #1 : Corrected funky grammar-typo...

EDIT #2 : I just noticed, that due to a minor mistake in the omission of a "P= 7" instruction, my code corrupts the system time. I'll upload a fixed version tomorrow...

EDIT #3 : Version 0.02a hopefully corrects the aforementioned "P= 7" mistake and the bug(s) in the ISR... Credit goes to Werner for the improved inner add loop...

EDIT #4 : Added latest version as attachment with none, 4x and 8x inner add loop unrolling...