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DEC/INC don't adjust carry flags

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2018-10-14 21:19:37 +01:00
parent 0c07d39250
commit 9d71c78338
1 changed files with 11 additions and 2 deletions
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13
MC6809/src/mc6809.cpp
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@ -837,7 +837,11 @@ uint8_t EightBit::mc6809::da(uint8_t operand) {
}
uint8_t EightBit::mc6809::dec(const uint8_t operand) {
return sub(operand, 1);
const register16_t subtraction = operand - 1;
const auto result = subtraction.low;
adjustNZ(result);
adjustOverflow(operand, 1, subtraction);
return result;
}
uint8_t EightBit::mc6809::eor(uint8_t operand, const uint8_t data) {
@ -895,7 +899,12 @@ void EightBit::mc6809::exg(const uint8_t data) {
}
uint8_t EightBit::mc6809::inc(uint8_t operand) {
return add(operand, 1);
const register16_t addition = operand + 1;
const auto result = addition.low;
adjustNZ(result);
adjustOverflow(operand, 1, addition);
adjustHalfCarry(operand, 1, result);
return result;
}
void EightBit::mc6809::jsr(const register16_t address) {