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Add branch_if_positive().

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This commit is contained in:
Andrew Keeton 2014-11-06 20:02:40 -05:00
parent eb27595cd5
commit f3160e1bcc
1 changed files with 6 additions and 0 deletions
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6
src/machine.rs
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@ -583,6 +583,12 @@ impl Machine {
} }
} }
fn branch_if_positive(&mut self, addr: Address) {
if !self.registers.status.contains(PS_NEGATIVE) {
self.registers.program_counter = addr;
}
}
fn push_on_stack(&mut self, val: u8) { fn push_on_stack(&mut self, val: u8) {
let addr = self.registers.stack_pointer.to_address(); let addr = self.registers.stack_pointer.to_address();
self.memory.set_byte(addr, val); self.memory.set_byte(addr, val);