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https://github.com/MoleskiCoder/EightBit.git
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d8977d32d3
This time to avoid temporary variables, in a similar manner to Z80 hardware. Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
42 lines
732 B
C++
42 lines
732 B
C++
#include "stdafx.h"
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#include "Processor.h"
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EightBit::Processor::Processor(Memory& memory)
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: m_memory(memory),
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cycles(0),
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m_halted(false) {
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sp.word = 0xffff;
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pc.word = 0;
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}
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void EightBit::Processor::reset() {
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pc.word = 0;
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}
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void EightBit::Processor::initialise() {
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sp.word = 0xffff;
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reset();
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}
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void EightBit::Processor::push(uint8_t value) {
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sp.word--;
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m_memory.ADDRESS() = sp;
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m_memory.reference() = value;
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}
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void EightBit::Processor::pushWord(register16_t value) {
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push(value.high);
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push(value.low);
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}
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uint8_t EightBit::Processor::pop() {
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m_memory.ADDRESS() = sp;
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sp.word++;
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return m_memory.reference();
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}
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void EightBit::Processor::popWord(register16_t& output) {
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output.low = pop();
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output.high = pop();
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}
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