Pre set all bits

Greg LaPolla

I am working on migrating some of my objects to spin2. I noticed that ~~ (pre) is no in spin2. I don't see anything that may have replaced it. Did i miss something or is it gone ?

ozpropdev

~~x in Spin1 is sign extend from bit 15.
Use X SIGNX 15 instead.

JonnyMac

From Chip's early document on Spin2

ZEROX		var ZEROX= x	17		x ZEROX y	3		binary		Zero-extend above bit y
SIGNX		var SIGNX= x	17		x SIGNX y	3		binary		Sign-extend from bit y

Peter Jakacki

I thought Greg was talking about x~~ and not ~~x where x~~ is preset to all ones.
But I guess I was wrong
Just having my morning coffee now!

2                        ~~x
Addr : 0018:          66 14  : Variable Operation Local Offset - 1 Assign ~~VAR Sign extend Word
3                        x~~
Addr : 001A:          66 1C  : Variable Operation Local Offset - 1 Assign VAR~~ Post-set
Addr : 001C:             32  : Return