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Correct for CF not being the first bit of the flags register (why!!!!)

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Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon 2017-07-19 23:16:17 +01:00
parent 36fbee35fb
commit 9c240b7ea8
1 changed files with 8 additions and 6 deletions
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14
LR35902/src/LR35902.cpp
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@ -136,7 +136,8 @@ void EightBit::LR35902::sbc(uint8_t& f, register16_t& operand, register16_t valu
auto before = operand;
auto result = before.word - value.word - (f & CF);
auto carry = (f & CF) >> 4;
auto result = before.word - value.word - carry;
operand.word = result;
clearFlag(f, ZF, operand.word);
@ -149,7 +150,8 @@ void EightBit::LR35902::adc(uint8_t& f, register16_t& operand, register16_t valu
auto before = operand;
auto result = before.word + value.word + (f & CF);
auto carry = (f & CF) >> 4;
auto result = before.word + value.word + carry;
operand.word = result;
clearFlag(f, ZF, result);
@ -190,7 +192,7 @@ void EightBit::LR35902::add(uint8_t& f, uint8_t& operand, uint8_t value, int car
}
void EightBit::LR35902::adc(uint8_t& f, uint8_t& operand, uint8_t value) {
add(operand, value, f & CF);
add(operand, value, (f & CF) >> 4);
}
void EightBit::LR35902::subtract(uint8_t& f, uint8_t& operand, uint8_t value, int carry) {
@ -208,7 +210,7 @@ void EightBit::LR35902::subtract(uint8_t& f, uint8_t& operand, uint8_t value, in
}
void EightBit::LR35902::sbc(uint8_t& f, uint8_t& operand, uint8_t value) {
subtract(operand, value, f & CF);
subtract(operand, value, (f & CF) >> 4);
}
void EightBit::LR35902::andr(uint8_t& f, uint8_t& operand, uint8_t value) {
@ -254,7 +256,7 @@ void EightBit::LR35902::rrc(uint8_t& f, uint8_t& operand) {
void EightBit::LR35902::rl(uint8_t& f, uint8_t& operand) {
clearFlag(f, NF | HC);
const auto carry = f & CF;
const auto carry = (f & CF) >> 4;
setFlag(f, CF, operand & Bit7);
operand = (operand << 1) | carry;
adjustZero<LR35902>(f, operand);
@ -262,7 +264,7 @@ void EightBit::LR35902::rl(uint8_t& f, uint8_t& operand) {
void EightBit::LR35902::rr(uint8_t& f, uint8_t& operand) {
clearFlag(f, NF | HC);
const auto carry = f & CF;
const auto carry = (f & CF) >> 4;
setFlag(f, CF, operand & Bit0);
operand = (operand >> 1) | (carry << 7);
adjustZero<LR35902>(f, operand);