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Clean up day 16

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Sijmen 2018-12-18 15:07:03 +01:00
parent 1c227f6906
commit 007234f7b2
1 changed files with 42 additions and 33 deletions
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75
Day16/Day16B.c
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@ -16,44 +16,32 @@ typedef struct {
} Sample;
enum {
ADDR, ADDI, MULR, MULI,
BANR, BANI, BORR, BORI,
SETR, SETI, GTIR, GTRI,
GTRR, EQIR, EQRI, EQRR,
ADDR, ADDI, MULR, MULI, BANR, BANI, BORR, BORI,
SETR, SETI, GTIR, GTRI, GTRR, EQIR, EQRI, EQRR,
};
#ifdef DEBUG
const char *names[] = {
"addr", "addi", "mulr", "muli",
"banr", "bani", "borr", "bori",
"setr", "seti", "gtir", "gtri",
"gtrr", "eqir", "eqri", "eqrr",
};
uint16_t table[16] = {
0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
"addr", "addi", "mulr", "muli", "banr", "bani", "borr", "bori",
"setr", "seti", "gtir", "gtri", "gtrr", "eqir", "eqri", "eqrr",
};
#endif
int opcodes[16];
int sample_read(Sample *s, FILE *file) {
int read = 0;
read =
fscanf(file, "Before: [%u, %u, %u, %u]\n",
&s->before[0], &s->before[1], &s->before[2], &s->before[3]);
read = fscanf(file, "Before: [%u, %u, %u, %u]\n",
&s->before[0], &s->before[1], &s->before[2], &s->before[3]);
if (read != 4) return 0;
Instruction *i = &s->instruction;
read = fscanf(file, "%" SCNu8 " %u %u %u\n",
&i->opcode, &i->a, &i->b, &i->c);
read = fscanf(file, "%" SCNu8 " %u %u %u\n", &i->opcode, &i->a, &i->b, &i->c);
if (read != 4) return 0;
read =
fscanf(file, "After: [%u, %u, %u, %u]\n\n",
&s->after[0], &s->after[1], &s->after[2], &s->after[3]);
read = fscanf(file, "After: [%u, %u, %u, %u]\n\n",
&s->after[0], &s->after[1], &s->after[2], &s->after[3]);
if (read != 4) return 0;
return 1;
@ -63,25 +51,32 @@ uint16_t sample_possible_opcodes(const Sample s) {
uint16_t possible_opcodes = 0;
Instruction i = s.instruction;
// Addition
if (s.after[i.c] == s.before[i.a] + s.before[i.b]) possible_opcodes |= 1 << ADDR;
if (s.after[i.c] == s.before[i.a] + i.b) possible_opcodes |= 1 << ADDI;
// Multiplication
if (s.after[i.c] == s.before[i.a] * s.before[i.b]) possible_opcodes |= 1 << MULR;
if (s.after[i.c] == s.before[i.a] * i.b) possible_opcodes |= 1 << MULI;
// Bitwise AND
if (s.after[i.c] == (s.before[i.a] & s.before[i.b])) possible_opcodes |= 1 << BANR;
if (s.after[i.c] == (s.before[i.a] & i.b)) possible_opcodes |= 1 << BANI;
// Bitwise OR
if (s.after[i.c] == (s.before[i.a] | s.before[i.b])) possible_opcodes |= 1 << BORR;
if (s.after[i.c] == (s.before[i.a] | i.b)) possible_opcodes |= 1 << BORI;
// Assignment
if (s.after[i.c] == s.before[i.a]) possible_opcodes |= 1 << SETR;
if (s.after[i.c] == i.a) possible_opcodes |= 1 << SETI;
// Greater-than testing
if (s.after[i.c] == (i.a > s.before[i.b])) possible_opcodes |= 1 << GTIR;
if (s.after[i.c] == (s.before[i.a] > i.b)) possible_opcodes |= 1 << GTRI;
if (s.after[i.c] == (s.before[i.a] > s.before[i.b])) possible_opcodes |= 1 << GTRR;
// Equality testing
if (s.after[i.c] == (i.a == s.before[i.b])) possible_opcodes |= 1 << EQIR;
if (s.after[i.c] == (s.before[i.a] == i.b)) possible_opcodes |= 1 << EQRI;
@ -101,8 +96,19 @@ int bits_set(uint16_t n) {
return bit;
}
void find_opcodes() {
void find_opcodes(FILE *file) {
int unknown = 16;
uint16_t table[16] = {
0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF,
};
Sample sample;
while (sample_read(&sample, file)) {
uint16_t possible_opcodes = sample_possible_opcodes(sample);
table[sample.instruction.opcode] &= possible_opcodes;
}
while (unknown > 0) {
for (int opcode = 0; opcode < 16; opcode++) {
int bit = bits_set(table[opcode]);
@ -117,9 +123,10 @@ void find_opcodes() {
}
}
for (int i = 0; i < 16; i++) {
#ifdef DEBUG
for (int i = 0; i < 16; i++)
printf("%d: %s\n", i, names[opcodes[i]]);
}
#endif
}
int instruction_read(Instruction *i, FILE *file) {
@ -170,25 +177,27 @@ int main(int argc, char **argv) {
}
FILE *file = fopen(argv[1], "r");
Sample sample = {0};
while (sample_read(&sample, file)) {
uint16_t possible_opcodes = sample_possible_opcodes(sample);
table[sample.instruction.opcode] &= possible_opcodes;
}
find_opcodes();
find_opcodes(file);
uint32_t registers[4] = {0};
Instruction instruction = {0};
while (instruction_read(&instruction, file)) {
#ifdef DEBUG
const char *name = names[opcodes[instruction.opcode]];
printf("opcode: %2d (%s), a: %d, b: %d, c: %d\n", instruction.opcode,
name, instruction.a, instruction.b, instruction.c);
#endif
instruction_execute(&instruction, registers);
#ifdef DEBUG
printf("registers: %d %d %d %d\n", registers[0], registers[1],
registers[2], registers[3]);
#endif
}
fclose(file);
printf("%d\n", registers[0]);
return EXIT_SUCCESS;
}