New HP 15c CE speed tests

[J-F Garnier]

(05-05-2023 05:27 PM)Gene Wrote:  On the original 15c, the Cy,x of 320,160 takes about 36 seconds as I just timed it.
On the 15c CE, simply dividing the loop of the calculation which took 18 seconds by 50, you get 0.36 seconds (humorous!)

So on this, the 15c CE is approximately 100X as fast as the original 15C.
Speed varies on different functions of course.

On many emulators, the speed ratio doesn't depend much on the type of operations, and we can estimate the speed ratio with any operation, such as a counting loop.

But the Coconut CPU is a special case, because the original CPU is a bit-serial processor that fetches and executes an instruction every 56-clock cycle (1 word time).
It doesn't depend if the instruction is simple, such as setting a CPU flag, or complex such as adding two 56-bit BCD numbers.
If the emulator is designed for maximum speed efficiency and doesn't try to mimic the CPU word time, it will execute simple instructions much faster than the complex ones.

So benchmarks that involve a lot of BCD math will have a lower speed ratio than others that are, for instance, just moving data around.

J-F