From 43f93dd64b9d3a17e5256f0e90a02cb7699808b9 Mon Sep 17 00:00:00 2001
From: Curtis McEnroe <june@causal.agency>
Date: Fri, 21 Dec 2018 07:01:23 -0500
Subject: Generalize day 19 solution

---
 2018/day19.c | 61 ++++++++++++------------------------------------------------
 1 file changed, 12 insertions(+), 49 deletions(-)

(limited to '2018')

diff --git a/2018/day19.c b/2018/day19.c
index eed25e1..d581f6b 100644
--- a/2018/day19.c
+++ b/2018/day19.c
@@ -111,57 +111,20 @@ int main(void) {
 	}
 	printf("%u\n", cpu.r[0]);
 
-	/*
-	00:	addi	ip	16	ip	goto 17
-	01:	seti	1	_	r5	r5 = 1
-	02:	seti	1	_	r3	r3 = 1
-	03:	mulr	r5	r3	r2	r2 = r5 * r3
-	04:	eqrr	r2	r4	r2	r2 = (r2 == r4)
-	05:	addr	r2	ip	ip	if r2 goto 7 else goto 6
-	06:	addi	ip	1	ip	goto 8
-	07:	addr	r5	r0	r0	r0 += r5
-	08:	addi	r3	1	r3	r3 += 1
-	09:	gtrr	r3	r4	r2	r2 = (r3 > r4)
-	10:	addr	ip	r2	ip	if r2 goto 12 else goto 11
-	11:	seti	2	_	ip	goto 3
-	12:	addi	r5	1	r5	r5 += 1
-	13:	gtrr	r5	r4	r2	r2 = (r5 > r4)
-	14:	addr	r2	ip	ip	if r2 goto 16 else goto 15
-	15:	seti	1	_	ip	goto 2
-	16:	mulr	ip	ip	ip	halt
-	17:	addi	r4	2	r4	r4 += 2
-	18:	mulr	r4	r4	r4	r4 *= r4
-	19:	mulr	ip	r4	r4	r4 *= 19
-	20:	muli	r4	11	r4	r4 *= 11
-	21:	addi	r2	5	r2	r2 += 5
-	22:	mulr	r2	ip	r2	r2 *= 22
-	23:	addi	r2	12	r2	r2 += 12
-	24:	addr	r4	r2	r4	r4 += r2
-	25:	addr	ip	r0	ip	if r0 goto 27 else goto 26
-	26:	seti	0	_	ip	goto 1
-	27:	setr	ip	_	r2	r2 = 27
-	28:	mulr	r2	ip	r2	r2 *= 28
-	29:	addr	ip	r2	r2	r2 += 29
-	30:	mulr	ip	r2	r2	r2 *= 30
-	31:	muli	r2	14	r2	r2 *= 14
-	32:	mulr	r2	ip	r2	r2 *= 32
-	33:	addr	r4	r2	r4	r4 += r2
-	34:	seti	0	_	r0	r0 = 0
-	35:	seti	0	_	ip	goto 1
-	*/
-
-#if 0
-	uint sum = 0;
-	uint big = 10551358;
-	for (uint a = 1; a <= big; a++) {
-		for (uint b = 1; b <= big; b++) {
-			if (a * b == big) sum += a;
-		}
+	cpu = (struct CPU) {
+		.ip = cpu.ip,
+		.r = { 1, 0, 0, 0, 0, 0 },
+	};
+	while (cpu.r[cpu.ip] != 1) {
+		struct Ins ins = prog[cpu.r[cpu.ip]];
+		cpu = Ops[ins.op].fn(cpu, ins.a, ins.b, ins.c);
+		cpu.r[cpu.ip]++;
+	}
+	uint big = 0;
+	for (uint i = 0; i < 6; ++i) {
+		if (cpu.r[i] > big) big = cpu.r[i];
 	}
-	printf("%u\n", r0);
-#endif
 
-	uint big = 10551358;
 	uint sum = 1 + big;
 	for (uint f = 2; big > 1; ++f) {
 		if (big % f) continue;
-- 
cgit 1.4.1