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Extract bit operators.

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This commit is contained in:
Thomas Harte
2025-10-23 20:47:55 -04:00
parent d42f005e17
commit e5f09002e9
1 changed files with 38 additions and 23 deletions
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Processors/6502Mk2/Perform.hpp
+38 -23
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@@ -232,6 +232,38 @@ void compare(RegistersT &registers, const uint8_t lhs, const uint8_t rhs) {
registers.flags.set_nz(lhs - rhs);
}
template <typename RegistersT>
void bit(RegistersT &registers, const uint8_t operand) {
registers.flags.zero_result = operand & registers.a;
registers.flags.negative_result = operand;
registers.flags.overflow = operand & Flag::Overflow;
}
template <typename RegistersT>
void bit_no_nv(RegistersT &registers, const uint8_t operand) {
registers.flags.zero_result = operand & registers.a;
}
template <typename RegistersT>
void trb(RegistersT &registers, uint8_t &operand) {
registers.flags.zero_result = operand & registers.a;
operand &= ~registers.a;
}
template <typename RegistersT>
void tsb(RegistersT &registers, uint8_t &operand) {
registers.flags.zero_result = operand & registers.a;
operand |= registers.a;
}
inline void rmb(uint8_t &operand, const uint8_t opcode) {
operand &= ~(1 << (opcode >> 4));
}
inline void smb(uint8_t &operand, const uint8_t opcode) {
operand |= 1 << ((opcode >> 4)&7);
}
}
template <typename RegistersT>
@@ -339,28 +371,12 @@ void perform(
// MARK: - Bit logic.
case Operation::BIT:
registers.flags.zero_result = operand & registers.a;
registers.flags.negative_result = operand;
registers.flags.overflow = operand & Flag::Overflow;
break;
case Operation::BITNoNV:
registers.flags.zero_result = operand & registers.a;
break;
case Operation::TRB:
registers.flags.zero_result = operand & registers.a;
operand &= ~registers.a;
break;
case Operation::TSB:
registers.flags.zero_result = operand & registers.a;
operand |= registers.a;
break;
case Operation::RMB:
operand &= ~(1 << (opcode >> 4));
break;
case Operation::SMB:
operand |= 1 << ((opcode >> 4)&7);
break;
case Operation::BIT: Operations::bit(registers, operand); break;
case Operation::BITNoNV: Operations::bit_no_nv(registers, operand); break;
case Operation::TRB: Operations::trb(registers, operand); break;
case Operation::TSB: Operations::tsb(registers, operand); break;
case Operation::RMB: Operations::rmb(operand, opcode); break;
case Operation::SMB: Operations::smb(operand, opcode); break;
// MARK: - Compare
@@ -378,7 +394,6 @@ void perform(
++operand;
Operations::sbc<model>(registers, operand);
break;
case Operation::SBC: Operations::sbc<model>(registers, operand); break;
case Operation::ADC: Operations::adc<model>(registers, operand); break;
case Operation::ARR: Operations::arr<model>(registers, operand); break;