enc

Dave Hein

The name "enc" is a reserved word in the Prop tool. If I try to use it the Prop tool complains that I need to define a unique name. If I use it in a DAT section the Prop tool will highlight it as if it is a PASM opcode. In fact, it treats it as an opcode. The following program generates an instruction value of $18FC0240.

pub dummy

dat
              org       0
              enc       temp1,#4
temp1         long      0

I believe enc is supposed to work like the Spin encode operator ">|". Has anybody tried this on the Prop? Does it work?

I am guessing that it was intended to work like the >| operation, but there is a problem with it. I can't find a reference to it in the Prop manual. Are there any other undocumented instructions like this?

Dave

localroger

According to the data sheet ENC, MUL, MULS, and ONES are the instructions that were planned but not implemented. If it were implemented it would be "Encode magnitude of S into D, result = 0..31"

Dave Hein

Thanks. It's interesting that the Prop tool contains these as reserved words, even though they can't be used for anything. I suppose it was done to prevent people from using these words so that their programs could be compiled to work on new versions that did support the instructions.

kuroneko

Not implemented, IIRC dst is cleared regardless of src.