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does ASHC clear carry when shift number is 0?

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folkert van heusden 2022-03-20 20:58:32 +01:00
parent ef73495a58
commit ca213298bb
1 changed files with 20 additions and 16 deletions
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36
cpu.cpp
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@ -434,8 +434,8 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
switch(operation) {
case 0: { // MUL
uint16_t R = getRegister(reg);
int32_t result = R * getGAM(dst_mode, dst_reg, true, false);
uint16_t R = getRegister(reg);
int32_t result = R * getGAM(dst_mode, dst_reg, true, false);
if (reg & 1)
setRegister(reg, result >> 16);
@ -451,7 +451,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
}
case 1: { // DIV
int32_t R0R1 = (getRegister(reg) << 16) | getRegister(reg + 1);
int32_t R0R1 = (getRegister(reg) << 16) | getRegister(reg + 1);
int32_t divider = getGAM(dst_mode, dst_reg, true, false);
if (divider == 0) {
@ -508,7 +508,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
}
case 3: { // ASHC
uint32_t R0R1 = (getRegister(reg) << 16) | getRegister(reg + 1);
uint32_t R0R1 = (getRegister(reg) << 16) | getRegister(reg + 1);
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
int16_t shift = b->read(a, false);
@ -522,6 +522,9 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
setPSW_c(R0R1 & 1);
R0R1 >>= 1;
}
else {
setPSW_c(false);
}
setRegister(reg, R0R1 & 65535);
setRegister(reg + 1, R0R1 >> 16);
@ -533,7 +536,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
}
case 4: { // XOR (word only)
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
uint16_t vl = b->read(a, false) ^ getRegister(reg);
if (dst_mode == 0)
@ -549,20 +552,21 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
}
case 7: { // SOB
uint16_t oldPC = getPC();
uint16_t oldPC = getPC();
if (reg == 7)
addRegister(reg, false, -2);
else
addRegister(reg, false, -1);
if (reg == 7)
addRegister(reg, false, -2);
else
addRegister(reg, false, -1);
if (getRegister(reg, false)) {
uint16_t newPC = oldPC - dst * 2;
setPC(newPC);
if (getRegister(reg, false)) {
uint16_t newPC = oldPC - dst * 2;
setPC(newPC);
}
return true;
}
return true;
}
}
return false;