DB48X: HP48-like RPL implementation for DM42

[c3d]

(11-05-2024 06:18 PM)raprism Wrote:  

(11-05-2024 01:05 AM)LinusSch Wrote:  Early versions used the Intel decimal floating point library, current versions use a custom floating point library that saves a lot of code space as compared to the Intel one and provides arbitrary precision. If you set your precision low enough the current versions should be able to go faster than the early versions, but I do not know how low you'd need to set it for which cases.

Good hint. I remember that this was changed to get the envisaged functionality implemented on DM42.

To reduce the processing time to bit less than 1/2 minute for 10k loops, I have to set the precision to the minimum value of 3 (standard is 24). Any other means (without code optimizations) to increase the speed?

1) Use hardware floating point (enable HwFP and set precision to 7 or 16). That should run 10k loops in about 6.8s (32-bit FP, precision 7) or 8.9s (64-bit FP, precision 16).

2) Run it on an iPhone. On my iPhone 12, I run 10k loops at 36-digit in 4.3s with 0.8.3. It should be about 20% faster with 0.8.4.