RPL second impressions (HP 28)

[Thomas Klemm]

(06-29-2018 07:35 PM)Gerson W. Barbosa Wrote:  This means my stack handling is not efficient. When properly done it should be faster than using local variables.

Don't consider me an expert so I could be totally wrong, but I would recommend:

• Avoid global variables in a program.
• Use local variables for immutable values to reduce the amount of objects on the stack.
• Use only the simplest stack-manipulating commands as DUP, SWAP, OVER or ROT.
  

I could imagine that creating a context for local variables is somewhat expensive. So don't do that within a tight loop. But accessing local variables should be fast. Similar to something like DUP or +.

In UserRPL the overhead for each command is big compared to actually doing it.
Thus reducing the amount of commands within a loop helps.
Just by counting the commands in the DO-loop we can see that their ratio 11 ÷ 12 is close to the ratio of durations: 201 ÷ 214.

Use SysRPL if time really matters.

Cheers
Thomas