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Small performance change to 8080 reserved flags.

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Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon 2017-06-16 13:35:08 +01:00
parent dc1f7ad1d5
commit c52f0a36aa
1 changed files with 11 additions and 7 deletions
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18
Intel8080/inc/Intel8080.h
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@ -38,12 +38,7 @@ namespace EightBit {
const std::array<Instruction, 0x100>& getInstructions() const { return instructions; }
register16_t& AF() {
af.low &= ~(Bit5 | Bit3);
af.low |= Bit1;
return af;
}
register16_t& AF() { return af; }
uint8_t& A() { return AF().high; }
uint8_t& F() { return AF().low; }
@ -105,6 +100,11 @@ namespace EightBit {
return cycles + instruction.count;
}
void adjustReservedFlags() {
AF().low &= ~(Bit5 | Bit3);
AF().low |= Bit1;
}
void adjustSign(uint8_t value) { setFlag(SF, value & SF); }
void adjustZero(uint8_t value) { clearFlag(ZF, value);}
@ -343,7 +343,11 @@ namespace EightBit {
void pop_b() { popWord(BC()); }
void pop_d() { popWord(DE()); }
void pop_h() { popWord(HL()); }
void pop_psw() { popWord(AF()); }
void pop_psw() {
popWord(AF());
adjustReservedFlags();
}
void xhtl() {
auto tos = m_memory.getWord(sp.word);