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Fast pure VB Random numbers, and Shift and Rotate 32 and 64 bit

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Submitted on: 4/16/2020 8:14:54 AM
By: Rde 
Level: Intermediate
User Rating: By 2 Users
Compatibility: VB 5.0, VB 6.0
Views: 7364
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Powerful Pure VB Technique

Sorry, second bug fix update April 16, 2020

This is 4 small VB modules that demonstrate a
rarely used but very powerful technique that
allow easy and fast multi-data-type transfers.

By using some simple UDT declarations you can
copy different data types from one to another
with no overhead and lightning fast too!

The secret is no secret at all, but is so rarely
seen you would think it was a secret - LSet.

This code demonstrates copying a Long to Currency
to allow unsigned arithmetic with no worries about
overflow or signed Long integer trouble. It then
copies the data back just as quickly and easily.

The most code efficient VB unsigned arithmetic ever!
This module now includes more detailed explanation.

A second small module demonstrates shifting bits.
Bit shifting is not a built-in operation in VB,
requiring multiplication, division and masking to
get the job done. This is now so fast and easy.

These techniques are demonstrated in another module
that performs Random Number Generation based on the
Mother Of All algorithm created by George Marsaglia.

This algo is truly fast with unbeatable output.

See Changes.txt.

This post now includes Fast pure VB Shift and Rotate 32-bit and 64-bit

Traditional shifting in VB requires quite convoluted conditionals, multiplication and masking to accomplish what is a simple operation in most other languages. The downside is these operations are relatively slow.

Until now! These pure VB routines are fast!


 
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Other User Comments

12/16/2016 1:53:43 PMRobert Dee

Rde, this is interesting. I was most interested in the bit shifting module but it seems to be missing - or I just can't see it. Thanks for your efforts.
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12/17/2016 2:51:35 AMRde

Hi Rob
Thanks for your interest in
my bit-shifting submission.
I realize I didn't give much
explanation on this technique
so I have added much needed
comments and more code, plus
an extra module to demo these
techniques.
Hope this helps and thanks :)

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12/18/2016 8:33:09 AMRde

Known bug
RandomRange can only handle positive values
between 1 and 2147483647
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12/19/2016 2:09:52 PMRde

Bug mentioned above is now fixed
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4/15/2020 7:29:22 AMRde

This update is very much a collaboration with Kenneth Ives
64-bit shift and rotate easy to add
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4/22/2020 5:42:10 PMPaul Bahlawan

Just .bas files? No demo project?
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4/22/2020 7:57:08 PMRde

hi Paul

I could probably get a demo of some sort for you

A silly dice rolling demo using random number generator

Or perhaps CRC 32 using bit shifting, no probs

Enter a number and use bit shift to display the binary zeroes and ones?

Or something more practical and useful, something you need?

Let me know any suggestions welcome

Happy coding
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4/23/2020 1:13:46 PMPaul Bahlawan

Lol rde! Your codes are often advanced beyond my comprehension, so some blinking lights would entertain me :)
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