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b57a946f6a
@ -157,6 +157,12 @@ impl Machine {
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self.branch_if_minus(addr);
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self.branch_if_minus(addr);
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}
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}
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(instruction::BPL, instruction::UseRelative(rel)) => {
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let addr = self.registers.program_counter
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+ AddressDiff(rel as i32);
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self.branch_if_positive(addr);
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}
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(instruction::CLC, instruction::UseImplied) => {
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(instruction::CLC, instruction::UseImplied) => {
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self.registers.status.and(!PS_CARRY);
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self.registers.status.and(!PS_CARRY);
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}
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}
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@ -583,6 +589,12 @@ impl Machine {
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}
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}
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}
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}
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fn branch_if_positive(&mut self, addr: Address) {
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if !self.registers.status.contains(PS_NEGATIVE) {
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self.registers.program_counter = addr;
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}
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}
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fn push_on_stack(&mut self, val: u8) {
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fn push_on_stack(&mut self, val: u8) {
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let addr = self.registers.stack_pointer.to_address();
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let addr = self.registers.stack_pointer.to_address();
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self.memory.set_byte(addr, val);
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self.memory.set_byte(addr, val);
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@ -956,3 +968,16 @@ fn branch_if_minus_test() {
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assert_eq!(machine.registers.program_counter, Address(0xABCD));
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assert_eq!(machine.registers.program_counter, Address(0xABCD));
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}
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}
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}
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}
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#[test]
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fn branch_if_positive_test() {
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let mut machine = Machine::new();
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machine.registers.status.insert(PS_NEGATIVE);
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machine.branch_if_positive(Address(0xABCD));
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assert_eq!(machine.registers.program_counter, Address(0));
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machine.registers.status.remove(PS_NEGATIVE);
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machine.branch_if_positive(Address(0xABCD));
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assert_eq!(machine.registers.program_counter, Address(0xABCD));
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}
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