Addpocalypse

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Addpocalypse is a simplification of Brainpocalypse II by User:Pro465. The author hopes, but does not, at the time of writing, know if it's TC.

Operation

Instruction	Meaning
n+	increments value in register #n
n?	jumps to start of program if value in register #n != value in register #0

(Whitespace is ignored.)

Since 0? is a nop, its syntax can be further simplified to only lists of integers, where a negative value -n denotes n? and nonnegative value n denotes n+

Sample program

input: x in register #1 (x != 0)

output: 3x in register #2

0+
2+2+2+
1?