Bitshift has unwanted sign extension

[quickbeam]

The BitShift funtion apparently does sign extension for 32-bit numbers if the MSb is set.  Is there any way to turn that off and do real (C style) bit shifts?

 

[jchd]

BitShift in AutoIt is an arithmetic bit shift, not a logical operation. Help file should really say so and warn that BitShift may produce surprising result to unsuspecting users, e.g.:

Local $i = 0xA0000000
Local $iSAR_1 = BitShift($i, -1)
ConsoleWrite($i & @TAB & Hex($i) & @LF & $iSAR_1 & @TAB & Hex($iSAR_1) & @LF)

 

[quickbeam]

Okay, thanks.  I guess arithmetic and logical are better terms to describe it.  I can see the value of both methods, but it did cause some debugging time. I guess I should have been tipped off when it said each bit shift is equivalent to doubling or halving the value.

I'm going to write my own, hopefully that won't take too long.

Edited July 12, 2017 by quickbeam
Add sentence to first paragraph

[junkew]

Maybe with clr.au3 you can create objects like System.Numerics.BigInteger and on those you can do shift or you make a small c# class and compile that on the fly with clr.au3