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scmp: Fix unreliable order of execution in JMP instruction

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AJR 2022-11-27 11:16:52 -05:00
parent 9d9d9685af
commit fe734f440d
1 changed files with 2 additions and 1 deletions
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3
src/devices/cpu/scmp/scmp.cpp
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@ -269,7 +269,8 @@ void scmp_device::execute_one(int opcode)
// Transfer Instructions
case 0x90 : case 0x91 : case 0x92 : case 0x93 :// JMP
m_icount -= 11;
m_PC.w.l = ADD12(GET_PTR_REG(ptr)->w.l,(int8_t)ARG());
tmp = ARG(); // PC must be updated before the destination address is calculated
m_PC.w.l = ADD12(GET_PTR_REG(ptr)->w.l,(int8_t)tmp);
break;
case 0x94 : case 0x95 : case 0x96 : case 0x97 :
// JP