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Posted: 06:04am 10 Oct 2024 Copy link to clipboard	Volhout Guru

Wauw,

I once did a project in F84 (Forth for the PIC16F84).
It ended up being a real nice working product, and actually the development time was not bad (given that I did not have any knowledge about Forth when I started).

But, same as above, the code is hard to understand. I really have to take out my HP11C calculator, make a few calculations, to get back into RPN (Forth is RPN) and go from there.

Volhout

Posted: 07:28am 10 Oct 2024 Copy link to clipboard	PhenixRising Guru

Volhout said Wauw,

I once did a project in F84 (Forth for the PIC16F84).
It ended up being a real nice working product, and actually the development time was not bad (given that I did not have any knowledge about Forth when I started).

But, same as above, the code is hard to understand. I really have to take out my HP11C calculator, make a few calculations, to get back into RPN (Forth is RPN) and go from there.

Volhout

Often referred to as a write-only language

Posted: 01:24pm 26 Apr 2025 Copy link to clipboard	zeitfest Guru

I have translated the benchmark into a little f77 and run it, but the pico seems disappointingly slow, especially so with double precision.

Looking at the Basic benchmark parts 7 and 8

Print "Benchmark 7"
Timer = 0
j = 0
dim ray2(5)
BM7:
j = j+1
m = j/2*3+4-5
Gosub 4000
For q = 1 TO 5
ray2(q) = m
Next q
If j < 1000 GoTo BM7
Print Timer / 1000
Print " "

Print "Benchmark 8"
Timer = 0
j = 0
BM8:
j = j+1
m = j^2
blog = LOG(j)
csin = SIN(j)
If j < 1000 GoTo BM8
Print Timer / 1000

I guess j/2*3+4-5 is using single prec floating point, but are LOG(j)
and SIN(j) assuming input j is an integer ? Some math routines are much faster
using integers as input, so that may be a factor.

Posted: 02:32pm 26 Apr 2025 Copy link to clipboard	JohnS Guru

zeitfest said I guess j/2*3+4-5 is using single prec floating point,

Looks like double in Picomite MMBasic.

zeitfest said but are LOG(j)
and SIN(j) assuming input j is an integer ?

Not by the looks of the source code.

It gets linked with the SDK's C library routines and I don't know whether they do some sort of tests for doubles which happen to be integers. (You could find out with some fairly simple code and timing loops I suppose.)

John

Posted: 02:38pm 26 Apr 2025 Copy link to clipboard	PhenixRising Guru

zeitfest said
Some math routines are much faster
using integers as input, so that may be a factor.

I was recently testing this, expecting integers to be faster but I found it not to be the case.
Can you give an example, please?

Posted: 11:57pm 26 Apr 2025 Copy link to clipboard	zeitfest Guru

I think many systems had a LOG (x) function where if x is an integer, some math tricks were used to simplify and speed it up, I will try to dig up some detail.

BTW This is the benchmark (with the lines and structure kept as original as practical including go to-s) as approximated using f77ish interpreter. [I added a MILLI function.] The output times are in milliseconds. Running on a standard pico with sdcard and i2c keypad and lcd interface running. It is a bit slow but it has debugging etc stuff to clean up yet.

Running

PROGRAM benchmarkdev
INTEGER*4 j, a, q, ray(5)
INTEGER*4 now, last, span
DOUBLE b, c, d
d = 1.123
C Benchmark 1
last = MILLI 1
DO 10 j = 1, 1000
10 CONTINUE
now = MILLI 1
span = now - last
PRINT *, "Benchmark 1 ", span
C Benchmark 2
last = MILLI 1
j = 0
20 j = j + 1
IF ( j < 1000 ) GO TO 20
now = MILLI 1
span = now - last
PRINT "Benchmark 2 ", span
C Benchmark 3
last = MILLI 1
j = 0
30 j = j + 1
a = j/j*j+j-j
IF ( j < 1000 ) GO TO 30
now = MILLI 1
span = now - last
PRINT "Benchmark 3 ", span
C Benchmark 4
last = MILLI 1
j = 0
40 j = j + 1
a = j/2*3+4-5
IF ( j < 1000 ) GO TO 40
now = MILLI 1
span = now - last
PRINT "Benchmark 4 ", span
C Benchmark 5
last = MILLI 1
j = 0
50 j = j + 1
a = j/2*3+4-5
CALL thesub ( )
IF ( j < 1000 ) GO TO 50
now = MILLI 1
span = now - last
PRINT "Benchmark 5 ", span
C Benchmark 6
last = MILLI 1
j = 0
60 j = j + 1
a = j/2*3+4-5
CALL thesub ( )
DO 65 q = 1, 5
65 CONTINUE
IF ( j < 1000 ) GO TO 60
now = MILLI 1
span = now - last
PRINT "Benchmark 6 ", span
C Benchmark 7
last = MILLI 1
j = 0
70 j = j + 1
a = j/2*3+4-5
CALL thesub ( )
DO 75 q = 1, 5
ray(q) = a
75 CONTINUE
IF ( j < 1000 ) GO TO 70
now = MILLI 1
span = now - last
PRINT "Benchmark 7 ", span
C Benchmark 8
last = MILLI 1
j = 0
80 j = j + 1
a = j ** 2
b = LOG (d)
c = SIN (d)
IF ( j < 1000 ) GO TO 80
now = MILLI 1
span = now - last
PRINT "Benchmark 8 ", span
END
C
C
SUBROUTINE thesub ( )
RETURN
END
\

Benchmark 1 24
Benchmark 2 214
Benchmark 3 373
Benchmark 4 374
Benchmark 5 455
Benchmark 6 680
Benchmark 7 1111
Benchmark 8 610

OK

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