Counter Machine Instructions
The various Counter machine instruction sets are like "ultra-RISC instruction sets". And, as is the case for different RISC machine builders, even for very similar machines, different authors have used different instruction sets. The "basic instructions" are used map these differences on the relevant Counter machine variant models.
|Emulated instruction||Implementation (script)||Comments|
||Go to i (unconditional jump); register #0 must contain 0.|
||IF rX=0 THEN i1 ELSE i2|
||Test r=0; if r = 0 then DEC|
||INC and J.|
||If r=0 goto *+3; if not then DEC and goto *-2|
|MOV(rX,rY)||1 CLR(rY) 2 JZ (rX,*+4) 3 INC(rY) 4 DEC(rX) 5 J (*-4) 6 CONTINUE||Move rX to rY, clearing contents of rX.|
|CPY(rX,rY)||1 CLR(rY) 9 JZ (rW,13) 2 CLR(rW) 10 INC(rX) 3 JZ (rX,8) 11 DEC(rW) 4 INC(rY) 12 J (9) 5 INC(rW) 13 CONTINUE 6 DEC(rX) 7 J (3) 8 ??||Copy rX into rY, rW must be free (at end rW=0).|
||Immediate (explicit) copy constant k from instructions into R: Clear R and ( INC(r) )1 ,..., ( INC(r) )k i.e. do k times. Alternatively: put constant in register #K: CPY (K, r1)|
|CMP(rX,rY,r)||1 CPY(rX,r) 6 JZ(r0,3) 2 CPY(rY,rW) 7 JZ(rW,9) 3 JZ(r,7) 8 INC(r) 4 DEC(r) 9 CONTINUE 5 DEC(rW)||Compare rX with rY and returns on r (r=0 if rX equal rY).|
|ADD(rX,rX,r)||... in terms of JZ, DEC, J, CLR, INC, CPY.||r=rX+rY; perhaps preserving the contents of rX and rY.|
|MUL(rX,rY,r)||... in terms of JZ, DEC, J, CLR, INC, CPY, ADD.||MULtiply, r=rX*rY; perhaps preserving the contents of rX and rY.|
|SUB(rX,rY,r)||... in terms of ...||SUBtract, r=rX-rY; perhaps preserving the contents of rX and rY.|
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