void execALU(){ switch(controle_alu.op_code){ case 1: add(); break; case 2: addinc(); break; case 3: and(); break; case 4: andnota(); break; case 5: asl(); break; case 6: asr(); break; case 7: deca(); break; case 8: inca(); break; case 9: j(); break; case 10: jal(); break; case 11: jf(); break; case 12: jr(); break; case 13: jt(); break; case 14: lch(); break; case 15: lcl(); break; case 16: load(); break; case 17: loadlit(); break; case 18: lsl(); break; case 19: lsr(); break; case 20: nand(); break; case 21: nor(); break; case 22: ones(); break; case 23: or(); break; case 24: ornotb(); break; case 25: passa(); break; case 26: passnota(); break; case 27: store(); break; case 28: sub(); break; case 29: subdec(); break; case 30: xnor(); break; case 31: xor(); break; case 32: zeros(); break; } }
/* finds the value of every led saves it in data structure and in Array (used for drawing screen) */ void findOutput(){ int i, n1, n2, value; output * optr; node * nptr; for(i = 0; i < c.li; i++) { init(&s); MakeStack(i); while(!empty(&s)) { nptr = pop(&s); switch(nptr->type) { case INPUT : PutValue(nptr, value); break; case OUTPUT : GetInputs(&n1, &n2, nptr->ptr); /* Calculating Output */ optr = nptr->ptr; switch(optr->type) { case NAND : value = nand(n1, n2); break; case XNOR : value = xnor(n1, n2); break; case NOR : value = nor(n1, n2); break; case AND : value = and(n1, n2); break; case OR : value = or(n1, n2); break; case XOR : value = xor(n1, n2); break; case NOT : value = not(n1); break; default : break; PutValue(nptr, value); } break; case SWITCH : value = GetValue(nptr->ptr); break; case LED : PutValue(nptr, value); break; } } } ChangeOnscreen(); }
//Perform the operation given by the CPU void ALU::operation(int code, Register a, Register b) { //Reset all flags that aren't required m_flags[1] = 0; m_flags[2] = 0; m_flags[3] = 0; //Check if unary operation if(!(code==0||code==1||code==4||code==9||code==13||code==16||code==17||code==18||code==19||code==20)) { //Compare a and b if possible and set flags if(a.getValue()>b.getValue()) { m_flags[1] = 1; } else if(a.getValue()==b.getValue()) { m_flags[2] = 1; } } //Perform operation based on code (sets carry flag to 0 if it isn't set in the operation) if(code==0) { zero(a); m_flags[0] = 0; } else if(code==1) { one(a); m_flags[0] = 0; } else if(code==2) { add(a,b); } else if(code==3) { addc(a,b); } else if(code==4) { inc(a); } else if(code==5) { sub(a,b); } else if(code==6) { subc(a,b); } else if(code==7) { rsub(a,b); } else if(code==8) { rsubc(a,b); } else if(code==9) { dec(a); } else if(code==10) { mul(a,b); } else if(code==11) { random(a); m_flags[0] = 0; } else if(code==16) { shl(a); } else if(code==17) { shlc(a); } else if(code==18) { shr(a); } else if(code==19) { shrc(a); } else if(code==20) { not(a); m_flags[0] = 0; } else if(code==21) { and(a,b); m_flags[0] = 0; } else if(code==22) { nand(a,b); m_flags[0] = 0; } else if(code==23) { or(a,b); m_flags[0] = 0; } else if(code==24) { nor(a,b); m_flags[0] = 0; } else if(code==25) { xor(a,b); m_flags[0] = 0; } else if(code==26) { xnor(a,b); m_flags[0] = 0; } else if(code==27) { bclr(a,b); m_flags[0] = 0; } else if(code==31) { m_flags[0] = 0; } //Check if output is 0 and set flag accordingly if(a.getValue()) { m_flags[3]=1; } }