372 lines
14 KiB
Rust
372 lines
14 KiB
Rust
|
#[macro_use]
|
||
|
|
extern crate log;
|
||
|
|
extern crate pretty_env_logger;
|
||
|
|
|
||
|
|
use std::collections::{HashMap, HashSet};
|
||
|
|
use std::fs::File;
|
||
|
|
use std::io::{BufRead, BufReader};
|
||
|
|
|
||
|
|
type Registers = [u64; 4];
|
||
|
|
type Instruction = [u64; 4];
|
||
|
|
type DecodeTable = HashMap<u64, String>;
|
||
|
|
|
||
|
|
struct OpSample {
|
||
|
|
before: Registers,
|
||
|
|
instruction: Instruction,
|
||
|
|
after: Registers,
|
||
|
|
}
|
||
|
|
|
||
|
|
fn extract_values_from_line(line: String) -> Registers {
|
||
|
|
let reg_chars = line.as_str();
|
||
|
|
let (_, second) = reg_chars.split_at(9);
|
||
|
|
let third = second.replace(",", "").replace("]", "");
|
||
|
|
iter_to_registers(third.split_whitespace())
|
||
|
|
}
|
||
|
|
|
||
|
|
fn iter_to_registers(iter: std::str::SplitWhitespace) -> Registers {
|
||
|
|
let mut results: Registers = [0u64; 4];
|
||
|
|
for (index, r) in iter.enumerate() {
|
||
|
|
results[index] = r.parse::<u64>().unwrap();
|
||
|
|
}
|
||
|
|
results
|
||
|
|
}
|
||
|
|
|
||
|
|
fn read_samples_from_file(filename: &str) -> Vec<OpSample> {
|
||
|
|
let mut lines: Vec<String> = BufReader::new(File::open(filename).unwrap())
|
||
|
|
.lines()
|
||
|
|
.map(|line| line.unwrap())
|
||
|
|
.collect();
|
||
|
|
let mut samples: Vec<OpSample> = vec![];
|
||
|
|
while !lines.is_empty() {
|
||
|
|
let before = extract_values_from_line(lines.remove(0));
|
||
|
|
let instruction = iter_to_registers(lines.remove(0).split_whitespace());
|
||
|
|
let after = extract_values_from_line(lines.remove(0));
|
||
|
|
lines.remove(0);
|
||
|
|
samples.push(OpSample {
|
||
|
|
before,
|
||
|
|
instruction,
|
||
|
|
after
|
||
|
|
});
|
||
|
|
}
|
||
|
|
samples
|
||
|
|
}
|
||
|
|
|
||
|
|
fn read_instructions_from_file(filename: &str) -> Vec<Instruction> {
|
||
|
|
let lines: Vec<Instruction> = BufReader::new(File::open(filename).unwrap())
|
||
|
|
.lines()
|
||
|
|
.map(|line| iter_to_registers(line.unwrap().split_whitespace()))
|
||
|
|
.collect();
|
||
|
|
lines
|
||
|
|
}
|
||
|
|
|
||
|
|
fn addr(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] + input_registers[instruction[2] as usize];
|
||
|
|
debug!("addr: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn addi(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] + instruction[2];
|
||
|
|
debug!("addi: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn mulr(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] * input_registers[instruction[2] as usize];
|
||
|
|
debug!("mulr: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn muli(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] * instruction[2];
|
||
|
|
debug!("muli: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn banr(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] & input_registers[instruction[2] as usize];
|
||
|
|
debug!("banr: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn bani(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] & instruction[2];
|
||
|
|
debug!("bani: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn borr(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] | input_registers[instruction[2] as usize];
|
||
|
|
debug!("borr: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn bori(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize] | instruction[2];
|
||
|
|
debug!("bori: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn setr(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = input_registers[instruction[1] as usize];
|
||
|
|
debug!("setr: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn seti(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
output_registers[instruction[3] as usize] = instruction[1];
|
||
|
|
debug!("seti: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn gtir(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
if instruction[1] > input_registers[instruction[2] as usize] {
|
||
|
|
output_registers[instruction[3] as usize] = 1;
|
||
|
|
} else {
|
||
|
|
output_registers[instruction[3] as usize] = 0;
|
||
|
|
}
|
||
|
|
debug!("gtir: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn gtri(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
if input_registers[instruction[1] as usize] > instruction[2] {
|
||
|
|
output_registers[instruction[3] as usize] = 1;
|
||
|
|
} else {
|
||
|
|
output_registers[instruction[3] as usize] = 0;
|
||
|
|
}
|
||
|
|
debug!("gtri: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn gtrr(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
if input_registers[instruction[1] as usize] > input_registers[instruction[2] as usize] {
|
||
|
|
output_registers[instruction[3] as usize] = 1;
|
||
|
|
} else {
|
||
|
|
output_registers[instruction[3] as usize] = 0;
|
||
|
|
}
|
||
|
|
debug!("gtrr: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn eqir(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
if instruction[1] == input_registers[instruction[2] as usize] {
|
||
|
|
output_registers[instruction[3] as usize] = 1;
|
||
|
|
} else {
|
||
|
|
output_registers[instruction[3] as usize] = 0;
|
||
|
|
}
|
||
|
|
debug!("eqir: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn eqri(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
if input_registers[instruction[1] as usize] == instruction[2] {
|
||
|
|
output_registers[instruction[3] as usize] = 1;
|
||
|
|
} else {
|
||
|
|
output_registers[instruction[3] as usize] = 0;
|
||
|
|
}
|
||
|
|
debug!("eqri: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn eqrr(input_registers: Registers, instruction: Instruction) -> Registers {
|
||
|
|
let mut output_registers = input_registers.clone();
|
||
|
|
if input_registers[instruction[1] as usize] == input_registers[instruction[2] as usize] {
|
||
|
|
output_registers[instruction[3] as usize] = 1;
|
||
|
|
} else {
|
||
|
|
output_registers[instruction[3] as usize] = 0;
|
||
|
|
}
|
||
|
|
debug!("eqrr: input {:?} output {:?}", input_registers, output_registers);
|
||
|
|
output_registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn matching_opcodes(i: &OpSample) -> Vec<&str> {
|
||
|
|
let mut m: Vec<&str> = Vec::with_capacity(16);
|
||
|
|
if addr(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches addr", i.instruction);
|
||
|
|
m.push("addr");
|
||
|
|
}
|
||
|
|
if addi(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches addi", i.instruction);
|
||
|
|
m.push("addi");
|
||
|
|
}
|
||
|
|
if mulr(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches mulr", i.instruction);
|
||
|
|
m.push("mulr");
|
||
|
|
}
|
||
|
|
if muli(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches muli", i.instruction);
|
||
|
|
m.push("muli");
|
||
|
|
}
|
||
|
|
if banr(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches banr", i.instruction);
|
||
|
|
m.push("banr");
|
||
|
|
}
|
||
|
|
if bani(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches bani", i.instruction);
|
||
|
|
m.push("bani");
|
||
|
|
}
|
||
|
|
if borr(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches borr", i.instruction);
|
||
|
|
m.push("borr");
|
||
|
|
}
|
||
|
|
if bori(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches bori", i.instruction);
|
||
|
|
m.push("bori");
|
||
|
|
}
|
||
|
|
if setr(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches setr", i.instruction);
|
||
|
|
m.push("setr");
|
||
|
|
}
|
||
|
|
if seti(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches seti", i.instruction);
|
||
|
|
m.push("seti");
|
||
|
|
}
|
||
|
|
if gtir(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches gtir", i.instruction);
|
||
|
|
m.push("gtir");
|
||
|
|
}
|
||
|
|
if gtri(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches gtri", i.instruction);
|
||
|
|
m.push("gtri");
|
||
|
|
}
|
||
|
|
if gtrr(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches gtrr", i.instruction);
|
||
|
|
m.push("gtrr");
|
||
|
|
}
|
||
|
|
if eqir(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches eqir", i.instruction);
|
||
|
|
m.push("eqir");
|
||
|
|
}
|
||
|
|
if eqri(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches eqri", i.instruction);
|
||
|
|
m.push("eqri");
|
||
|
|
}
|
||
|
|
if eqrr(i.before, i.instruction) == i.after {
|
||
|
|
debug!("{:?} matches eqrr", i.instruction);
|
||
|
|
m.push("eqrr");
|
||
|
|
}
|
||
|
|
m
|
||
|
|
}
|
||
|
|
|
||
|
|
fn reduce_decode_map(map: &mut HashMap<u64, HashSet<&str>>) -> DecodeTable {
|
||
|
|
let mut results: DecodeTable = HashMap::new();
|
||
|
|
let mut removed_one = true;
|
||
|
|
while !map.is_empty() && removed_one {
|
||
|
|
removed_one = false;
|
||
|
|
let mut this_pass_found_opcodes: HashSet<u64> = HashSet::new();
|
||
|
|
let mut this_pass_found_instr: HashSet<&str> = HashSet::new();
|
||
|
|
for (confirmed_op, confirmed_instructions) in map.iter() {
|
||
|
|
if confirmed_instructions.len() > 1 {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
removed_one = true;
|
||
|
|
let confirmed_instruction = confirmed_instructions.iter().nth(0).unwrap();
|
||
|
|
results.entry(*confirmed_op).or_insert(confirmed_instruction.to_string());
|
||
|
|
this_pass_found_opcodes.insert(*confirmed_op);
|
||
|
|
this_pass_found_instr.insert(*confirmed_instruction);
|
||
|
|
}
|
||
|
|
for op in this_pass_found_opcodes.iter() {
|
||
|
|
map.retain(|k,_| k != op);
|
||
|
|
}
|
||
|
|
for instr in this_pass_found_instr.iter() {
|
||
|
|
for (_k,v) in map.iter_mut() {
|
||
|
|
v.retain(|i| i != instr);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
results
|
||
|
|
}
|
||
|
|
|
||
|
|
fn opcodes_part_one(samples: &Vec<OpSample>) -> (u16, DecodeTable) {
|
||
|
|
let mut i: u16 = 0;
|
||
|
|
let mut decode_map: HashMap<u64, HashSet<&str>> = HashMap::new();
|
||
|
|
for sample in samples.iter() {
|
||
|
|
let matched_ops = matching_opcodes(&sample);
|
||
|
|
if matched_ops.len() >= 3 {
|
||
|
|
i += 1;
|
||
|
|
}
|
||
|
|
debug!("{:?} matches {} opcodes", sample.instruction, matched_ops.len());
|
||
|
|
let instruction = sample.instruction[0];
|
||
|
|
for op in matched_ops.iter() {
|
||
|
|
decode_map.entry(instruction).and_modify(|m| {
|
||
|
|
m.insert(op);
|
||
|
|
}).or_insert(HashSet::<&str>::new());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
let final_decode_map = reduce_decode_map(&mut decode_map);
|
||
|
|
for (op, instr) in final_decode_map.iter() {
|
||
|
|
debug!("final decode of {} into {}", op, instr);
|
||
|
|
}
|
||
|
|
(i, final_decode_map)
|
||
|
|
}
|
||
|
|
|
||
|
|
fn execute_program(decode_table: &DecodeTable, instructions: &Vec<Instruction>) -> Registers {
|
||
|
|
let mut registers: Registers = [0u64; 4];
|
||
|
|
for instruction in instructions.iter() {
|
||
|
|
debug!("{:?}", instruction);
|
||
|
|
registers = match decode_table.get(&instruction[0]) {
|
||
|
|
Some(x) => {
|
||
|
|
match x.as_str() {
|
||
|
|
"addr" => addr(registers, *instruction),
|
||
|
|
"addi" => addi(registers, *instruction),
|
||
|
|
"mulr" => mulr(registers, *instruction),
|
||
|
|
"muli" => muli(registers, *instruction),
|
||
|
|
"banr" => banr(registers, *instruction),
|
||
|
|
"bani" => bani(registers, *instruction),
|
||
|
|
"borr" => borr(registers, *instruction),
|
||
|
|
"bori" => bori(registers, *instruction),
|
||
|
|
"setr" => setr(registers, *instruction),
|
||
|
|
"seti" => seti(registers, *instruction),
|
||
|
|
"gtir" => gtir(registers, *instruction),
|
||
|
|
"gtri" => gtri(registers, *instruction),
|
||
|
|
"gtrr" => gtrr(registers, *instruction),
|
||
|
|
"eqir" => eqir(registers, *instruction),
|
||
|
|
"eqri" => eqri(registers, *instruction),
|
||
|
|
"eqrr" => eqrr(registers, *instruction),
|
||
|
|
_ => panic!("No decoded instruction available for {}", x),
|
||
|
|
}
|
||
|
|
},
|
||
|
|
None => panic!("Unmapped instruction!"),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
registers
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
pretty_env_logger::init();
|
||
|
|
let samples = read_samples_from_file("input-part-1");
|
||
|
|
debug!("samples len is {}", samples.len());
|
||
|
|
let (part1, decode_table) = opcodes_part_one(&samples);
|
||
|
|
println!("samples matching 3 or more opcodes: {}", part1);
|
||
|
|
let program = read_instructions_from_file("input-part-2");
|
||
|
|
let registers: Registers = execute_program(&decode_table, &program);
|
||
|
|
println!("final registers: {:?}", registers);
|
||
|
|
}
|
||
|
|
|
||
|
|
#[cfg(test)]
|
||
|
|
mod tests {
|
||
|
|
use super::*;
|
||
|
|
|
||
|
|
#[test]
|
||
|
|
fn test_sample_one() {
|
||
|
|
let samples = read_samples_from_file("test-input");
|
||
|
|
assert_eq!(matching_opcodes(&samples[0]), 3);
|
||
|
|
}
|
||
|
|
}
|