rep

snes-core/src/cpu/instructionstemp/mod.rs

@@ -58,6 +58,7 @@ pub mod pld;
 pub mod plp;
 pub mod plx;
 pub mod ply;
+pub mod rep;
 pub mod bit_common;
 pub mod dec_common;
 pub mod decoder_common;

snes-core/src/cpu/instructionstemp/rep.rs

@@ -0,0 +1,46 @@
+use crate::cpu::{bus::Bus, registers::Registers};
+
+use crate::cpu::cycles;
+use crate::utils::addressing::AddressingMode;
+use super::{CPUInstruction, Decode, read_8bit_from_address};
+use super::decoder_common;
+
+static INSTR_NAME: &'static str = "REP";
+
+pub struct REP {}
+
+impl CPUInstruction for REP {
+    fn execute(&self, registers: &mut Registers, bus: &mut Bus) {
+        let byte = read_8bit_from_address(registers, bus, AddressingMode::Immediate);
+        registers.reset_rep_byte(byte);
+        let (bytes, cycles) = cycles::increment_cycles_rep();
+        registers.increment_pc(bytes); registers.cycles += cycles;
+    }
+}
+
+impl Decode for REP {
+    fn mnemonic(&self, registers: &Registers, bus: &Bus, opcode: u8) -> String {
+        decoder_common::mnemonic_8bit_immediate(opcode, INSTR_NAME, registers, bus)
+    }
+}
+
+
+#[cfg(test)]
+mod cpu_instructions_tests {
+    use super::*;
+
+    #[test]
+    fn test() {
+        let mut registers = Registers::new();
+        let mut bus = Bus::new();
+        registers.emulation_mode = false;
+        registers.pc  = 0x0000;
+        registers.p  = 0xFF;
+        bus.write(0x0001, 0xFF);
+        let instruction = REP{};
+        instruction.execute(&mut registers, &mut bus);
+        assert_eq!(registers.p, 0x00);
+        assert_eq!(registers.pc, 0x0002);
+        assert_eq!(registers.cycles, 3);
+    }
+}