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Eliminate repetition macros.
This commit is contained in:
Thomas Harte
parent
cc635fd3ea
commit
980ccbd45b
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@ -120,6 +120,109 @@ template < class T,
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}
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};
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/// Performs the repeat step of LDIR, LDDR, etc that either:
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/// * repeats this instruction if test is true, updating MEMPTR appropriately; or
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/// * moves to the next operation otherwise.
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const auto repeat_mem = [&](bool test) {
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if(test) {
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pc_.full -= 2;
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memptr_.full = pc_.full + 1;
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} else {
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advance_operation();
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}
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};
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/// Performs the repeat step of INIR, OTIR, etc that either:
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/// * repeats this instruction if test is true; or
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/// * moves to the next operation otherwise.
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/// Unlike repeat_memptr, this does not affect MEMPTR.
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const auto repeat_io = [&](bool test) {
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if(test) {
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pc_.full -= 2;
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} else {
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advance_operation();
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}
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};
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/// Performs a single instance of LDD/LDI/LDDR/LDIR, setting flags appropriately.
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const auto LDxR = [&](int direction) {
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--bc_.full;
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de_.full += direction;
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hl_.full += direction;
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const uint8_t sum = a_ + temp8_;
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bit53_result_ = uint8_t((sum&0x8) | ((sum & 0x02) << 4));
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subtract_flag_ = 0;
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half_carry_result_ = 0;
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parity_overflow_result_ = bc_.full ? Flag::Parity : 0;
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set_did_compute_flags();
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};
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/// Performs a single instance of CPD/CPI/CPDR/CPIR, setting flags appropriately.
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const auto CPxR = [&](int direction) {
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--bc_.full;
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hl_.full += direction;
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memptr_.full += direction;
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uint8_t result = a_ - temp8_;
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const uint8_t halfResult = (a_&0xf) - (temp8_&0xf);
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parity_overflow_result_ = bc_.full ? Flag::Parity : 0;
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half_carry_result_ = halfResult;
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subtract_flag_ = Flag::Subtract;
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sign_result_ = zero_result_ = result;
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result -= (halfResult >> 4)&1;
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bit53_result_ = uint8_t((result&0x8) | ((result&0x2) << 4));
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set_did_compute_flags();
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};
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/// Performs a single instance of IND/INI/INDR/INIR, setting flags appropriately.
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const auto INxR = [&](int direction) {
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memptr_.full = uint16_t(bc_.full + direction);
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--bc_.halves.high;
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hl_.full += direction;
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sign_result_ = zero_result_ = bit53_result_ = bc_.halves.high;
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subtract_flag_ = (temp8_ >> 6) & Flag::Subtract;
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const int next_bc = bc_.halves.low + direction;
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int summation = temp8_ + (next_bc&0xff);
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if(summation > 0xff) {
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carry_result_ = Flag::Carry;
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half_carry_result_ = Flag::HalfCarry;
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} else {
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carry_result_ = 0;
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half_carry_result_ = 0;
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}
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summation = (summation&7) ^ bc_.halves.high;
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set_parity(uint8_t(summation));
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set_did_compute_flags();
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};
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/// Performs a single instance of OTD/OTI/OTDR/OTIR, setting flags appropriately.
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const auto OUTxR = [&](int direction) {
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--bc_.halves.high;
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memptr_.full = uint16_t(bc_.full + direction);
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hl_.full += direction;
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sign_result_ = zero_result_ = bit53_result_ = bc_.halves.high;
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subtract_flag_ = (temp8_ >> 6) & Flag::Subtract;
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int summation = temp8_ + hl_.halves.low;
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if(summation > 0xff) {
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carry_result_ = Flag::Carry;
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half_carry_result_ = Flag::HalfCarry;
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} else {
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carry_result_ = half_carry_result_ = 0;
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}
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summation = (summation&7) ^ bc_.halves.high;
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set_parity(uint8_t(summation));
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set_did_compute_flags();
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};
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number_of_cycles_ += cycles;
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if(!scheduled_program_counter_) {
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@ -510,166 +613,48 @@ template < class T,
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// MARK: - Repetition
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#define REPEAT(test) \
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if(test) { \
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pc_.full -= 2; \
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memptr_.full = pc_.full + 1; \
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} else { \
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advance_operation(); \
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}
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#define LDxR_STEP(dir) \
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bc_.full--; \
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de_.full += dir; \
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hl_.full += dir; \
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const uint8_t sum = a_ + temp8_; \
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bit53_result_ = uint8_t((sum&0x8) | ((sum & 0x02) << 4)); \
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subtract_flag_ = 0; \
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half_carry_result_ = 0; \
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parity_overflow_result_ = bc_.full ? Flag::Parity : 0; \
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set_did_compute_flags();
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case MicroOp::LDDR: {
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LDxR_STEP(-1);
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REPEAT(bc_.full);
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} break;
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case MicroOp::LDIR: {
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LDxR_STEP(1);
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REPEAT(bc_.full);
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} break;
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case MicroOp::LDD: {
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LDxR_STEP(-1);
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} break;
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case MicroOp::LDI: {
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LDxR_STEP(1);
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} break;
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#undef LDxR_STEP
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#define CPxR_STEP(dir) \
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hl_.full += dir; \
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memptr_.full += dir; \
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bc_.full--; \
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\
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uint8_t result = a_ - temp8_; \
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const uint8_t halfResult = (a_&0xf) - (temp8_&0xf); \
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\
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parity_overflow_result_ = bc_.full ? Flag::Parity : 0; \
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half_carry_result_ = halfResult; \
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subtract_flag_ = Flag::Subtract; \
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sign_result_ = zero_result_ = result; \
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\
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result -= (halfResult >> 4)&1; \
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bit53_result_ = uint8_t((result&0x8) | ((result&0x2) << 4)); \
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set_did_compute_flags();
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case MicroOp::CPDR: {
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CPxR_STEP(-1);
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REPEAT(bc_.full && sign_result_);
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} break;
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case MicroOp::CPIR: {
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CPxR_STEP(1);
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REPEAT(bc_.full && sign_result_);
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} break;
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case MicroOp::CPD: {
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CPxR_STEP(-1);
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} break;
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case MicroOp::CPI: {
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CPxR_STEP(1);
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} break;
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#undef CPxR_STEP
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#undef REPEAT
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#define REPEAT(test) \
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if(test) { \
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pc_.full -= 2; \
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} else { \
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advance_operation(); \
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}
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#define INxR_STEP(dir) \
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memptr_.full = uint16_t(bc_.full + dir); \
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bc_.halves.high--; \
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hl_.full += dir; \
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\
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sign_result_ = zero_result_ = bit53_result_ = bc_.halves.high; \
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subtract_flag_ = (temp8_ >> 6) & Flag::Subtract; \
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\
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const int next_bc = bc_.halves.low + dir; \
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int summation = temp8_ + (next_bc&0xff); \
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\
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if(summation > 0xff) { \
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carry_result_ = Flag::Carry; \
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half_carry_result_ = Flag::HalfCarry; \
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} else { \
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carry_result_ = 0; \
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half_carry_result_ = 0; \
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} \
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\
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summation = (summation&7) ^ bc_.halves.high; \
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set_parity(summation); \
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set_did_compute_flags();
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case MicroOp::INDR: {
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INxR_STEP(-1);
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REPEAT(bc_.halves.high);
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} break;
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case MicroOp::INIR: {
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INxR_STEP(1);
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REPEAT(bc_.halves.high);
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} break;
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case MicroOp::IND: {
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INxR_STEP(-1);
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} break;
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case MicroOp::INI: {
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INxR_STEP(1);
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} break;
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#undef INxR_STEP
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#define OUTxR_STEP(dir) \
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bc_.halves.high--; \
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memptr_.full = uint16_t(bc_.full + dir); \
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hl_.full += dir; \
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\
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sign_result_ = zero_result_ = bit53_result_ = bc_.halves.high; \
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subtract_flag_ = (temp8_ >> 6) & Flag::Subtract; \
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\
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int summation = temp8_ + hl_.halves.low; \
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if(summation > 0xff) { \
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carry_result_ = Flag::Carry; \
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half_carry_result_ = Flag::HalfCarry; \
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} else { \
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carry_result_ = half_carry_result_ = 0; \
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} \
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\
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summation = (summation&7) ^ bc_.halves.high; \
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set_parity(summation); \
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set_did_compute_flags();
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case MicroOp::OUT_R:
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REPEAT(bc_.halves.high);
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case MicroOp::LDDR:
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LDxR(-1);
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repeat_mem(bc_.full);
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break;
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case MicroOp::OUTD: {
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OUTxR_STEP(-1);
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} break;
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case MicroOp::LDIR:
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LDxR(1);
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repeat_mem(bc_.full);
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break;
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case MicroOp::OUTI: {
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OUTxR_STEP(1);
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} break;
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case MicroOp::CPDR:
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CPxR(-1);
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repeat_mem(bc_.full && sign_result_);
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break;
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#undef OUTxR_STEP
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case MicroOp::CPIR:
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CPxR(1);
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repeat_mem(bc_.full && sign_result_);
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break;
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case MicroOp::INDR:
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INxR(-1);
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repeat_io(bc_.halves.high);
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break;
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case MicroOp::INIR:
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INxR(1);
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repeat_io(bc_.halves.high);
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break;
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case MicroOp::OUT_R:
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repeat_io(bc_.halves.high);
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break;
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case MicroOp::LDD: LDxR(-1); break;
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case MicroOp::CPD: CPxR(-1); break;
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case MicroOp::IND: INxR(-1); break;
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case MicroOp::OUTD: OUTxR(-1); break;
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case MicroOp::LDI: LDxR(1); break;
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case MicroOp::CPI: CPxR(1); break;
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case MicroOp::INI: INxR(1); break;
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case MicroOp::OUTI: OUTxR(1); break;
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// MARK: - Bit Manipulation
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