Clean up day 16
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1c227f6906
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007234f7b2
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@ -16,44 +16,32 @@ typedef struct {
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} Sample;
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enum {
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ADDR, ADDI, MULR, MULI,
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BANR, BANI, BORR, BORI,
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SETR, SETI, GTIR, GTRI,
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GTRR, EQIR, EQRI, EQRR,
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ADDR, ADDI, MULR, MULI, BANR, BANI, BORR, BORI,
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SETR, SETI, GTIR, GTRI, GTRR, EQIR, EQRI, EQRR,
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};
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#ifdef DEBUG
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const char *names[] = {
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"addr", "addi", "mulr", "muli",
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"banr", "bani", "borr", "bori",
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"setr", "seti", "gtir", "gtri",
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"gtrr", "eqir", "eqri", "eqrr",
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};
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uint16_t table[16] = {
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0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
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0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
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0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
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0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
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"addr", "addi", "mulr", "muli", "banr", "bani", "borr", "bori",
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"setr", "seti", "gtir", "gtri", "gtrr", "eqir", "eqri", "eqrr",
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};
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#endif
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int opcodes[16];
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int sample_read(Sample *s, FILE *file) {
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int read = 0;
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read =
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fscanf(file, "Before: [%u, %u, %u, %u]\n",
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&s->before[0], &s->before[1], &s->before[2], &s->before[3]);
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read = fscanf(file, "Before: [%u, %u, %u, %u]\n",
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&s->before[0], &s->before[1], &s->before[2], &s->before[3]);
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if (read != 4) return 0;
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Instruction *i = &s->instruction;
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read = fscanf(file, "%" SCNu8 " %u %u %u\n",
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&i->opcode, &i->a, &i->b, &i->c);
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read = fscanf(file, "%" SCNu8 " %u %u %u\n", &i->opcode, &i->a, &i->b, &i->c);
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if (read != 4) return 0;
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read =
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fscanf(file, "After: [%u, %u, %u, %u]\n\n",
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&s->after[0], &s->after[1], &s->after[2], &s->after[3]);
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read = fscanf(file, "After: [%u, %u, %u, %u]\n\n",
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&s->after[0], &s->after[1], &s->after[2], &s->after[3]);
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if (read != 4) return 0;
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return 1;
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@ -63,25 +51,32 @@ uint16_t sample_possible_opcodes(const Sample s) {
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uint16_t possible_opcodes = 0;
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Instruction i = s.instruction;
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// Addition
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if (s.after[i.c] == s.before[i.a] + s.before[i.b]) possible_opcodes |= 1 << ADDR;
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if (s.after[i.c] == s.before[i.a] + i.b) possible_opcodes |= 1 << ADDI;
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// Multiplication
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if (s.after[i.c] == s.before[i.a] * s.before[i.b]) possible_opcodes |= 1 << MULR;
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if (s.after[i.c] == s.before[i.a] * i.b) possible_opcodes |= 1 << MULI;
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// Bitwise AND
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if (s.after[i.c] == (s.before[i.a] & s.before[i.b])) possible_opcodes |= 1 << BANR;
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if (s.after[i.c] == (s.before[i.a] & i.b)) possible_opcodes |= 1 << BANI;
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// Bitwise OR
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if (s.after[i.c] == (s.before[i.a] | s.before[i.b])) possible_opcodes |= 1 << BORR;
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if (s.after[i.c] == (s.before[i.a] | i.b)) possible_opcodes |= 1 << BORI;
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// Assignment
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if (s.after[i.c] == s.before[i.a]) possible_opcodes |= 1 << SETR;
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if (s.after[i.c] == i.a) possible_opcodes |= 1 << SETI;
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// Greater-than testing
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if (s.after[i.c] == (i.a > s.before[i.b])) possible_opcodes |= 1 << GTIR;
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if (s.after[i.c] == (s.before[i.a] > i.b)) possible_opcodes |= 1 << GTRI;
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if (s.after[i.c] == (s.before[i.a] > s.before[i.b])) possible_opcodes |= 1 << GTRR;
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// Equality testing
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if (s.after[i.c] == (i.a == s.before[i.b])) possible_opcodes |= 1 << EQIR;
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if (s.after[i.c] == (s.before[i.a] == i.b)) possible_opcodes |= 1 << EQRI;
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@ -101,8 +96,19 @@ int bits_set(uint16_t n) {
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return bit;
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}
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void find_opcodes() {
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void find_opcodes(FILE *file) {
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int unknown = 16;
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uint16_t table[16] = {
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0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
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0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
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};
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Sample sample;
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while (sample_read(&sample, file)) {
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uint16_t possible_opcodes = sample_possible_opcodes(sample);
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table[sample.instruction.opcode] &= possible_opcodes;
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}
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while (unknown > 0) {
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for (int opcode = 0; opcode < 16; opcode++) {
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int bit = bits_set(table[opcode]);
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@ -117,9 +123,10 @@ void find_opcodes() {
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}
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}
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for (int i = 0; i < 16; i++) {
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#ifdef DEBUG
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for (int i = 0; i < 16; i++)
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printf("%d: %s\n", i, names[opcodes[i]]);
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}
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#endif
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}
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int instruction_read(Instruction *i, FILE *file) {
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@ -170,25 +177,27 @@ int main(int argc, char **argv) {
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}
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FILE *file = fopen(argv[1], "r");
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Sample sample = {0};
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while (sample_read(&sample, file)) {
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uint16_t possible_opcodes = sample_possible_opcodes(sample);
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table[sample.instruction.opcode] &= possible_opcodes;
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}
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find_opcodes();
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find_opcodes(file);
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uint32_t registers[4] = {0};
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Instruction instruction = {0};
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while (instruction_read(&instruction, file)) {
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#ifdef DEBUG
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const char *name = names[opcodes[instruction.opcode]];
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printf("opcode: %2d (%s), a: %d, b: %d, c: %d\n", instruction.opcode,
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name, instruction.a, instruction.b, instruction.c);
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#endif
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instruction_execute(&instruction, registers);
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#ifdef DEBUG
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printf("registers: %d %d %d %d\n", registers[0], registers[1],
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registers[2], registers[3]);
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#endif
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}
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fclose(file);
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printf("%d\n", registers[0]);
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return EXIT_SUCCESS;
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}
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