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From: minforth@gmx.net (minforth)
Newsgroups: comp.lang.forth
Subject: Re: Avoid treating the stack as an array [Re: "Back & Forth" is back!]
Date: Sun, 15 Sep 2024 06:17:18 +0000
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On Sat, 14 Sep 2024 19:19:25 +0000, Ahmed wrote:
> You are right.
> I find with gforth:
>
> : go 0 do -0.1e neg_big fdrop loop ;
>
> without locals:
> utime 100000000 go utime d>f d>f f- 1e-8 f* f. 0.06762074 us  ok for 1e8
> times: (67.62 ns)
>
> and with locals:
> utime 100000000 go utime d>f d>f f- 1e-8 f* f.   0.09961387 us  ok for
> 1e8 times: (99.61 ns)
>
> I missused the timing in the previous post.
> Thanks for the correction.

So with gforth it's about 30 nanosecs runtime disadvantage.
IOW if you run the code 3*10^7 times it adds up to 1 sec disadvantage.

While the locals version was easy to code, pretty straightforward and
probably bug-free out of the box, how long did it take to code and debug
the stack juggling version?

Say 10 minutes longer. Break-even point would be around 2*10^10 runs,
and the dubious assumption that CPU time is as valuable as human time.