Segona part del puzzle

aoc_25_1_1/src/count.s

@@ -3,7 +3,7 @@
     .p2align   4
 
 count:
-    cmp w1, #0
+    cmp w1, wzr
     b.eq count1
     b finish
 count1:

aoc_25_1_1/src/right.s

@@ -12,7 +12,7 @@ right1:
     b.eq finish
     b right
 loop0:
-    mov w0, #0
+    mov w0, wzr
     b right1
 finish:
     ret

aoc_25_1_2/Makefile

@@ -0,0 +1,2 @@
+build:
+	gcc -g src/aoc25.c src/*.s -o out_a64

aoc_25_1_2/src/aoc25.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <string.h>
+
+extern int left(unsigned long* drp);
+extern int right(unsigned long* drp);
+
+int main(void) {
+    char direction[2];
+    unsigned long drp[] = {50, 0, 0}; /* dial - rotation - password */
+    int retval;
+
+    FILE *fptr = fopen("aoc25_1_2.txt", "r");
+
+    if (fptr == NULL) {
+        printf("Error, puzzle input aoc25_1_2.txt not found\n");
+        return (1);
+    }
+
+    printf("DIAL starts at %d\n", drp[0]);
+
+    while (fscanf(fptr, "%s %d", direction, &drp[1]) == 2) {
+        printf("DIRECTION %s ROTATION %d\n", direction, drp[1]);
+
+        if (strcmp(direction, "L") == 0) {
+            retval = left(drp);
+            printf("DIAL is now %ld\n", drp[0]);
+            printf("PASSWORD is now %ld\n", drp[2]);
+        }
+
+        if (strcmp(direction, "R") == 0) {
+            retval = right(drp);
+            printf("DIAL is now %ld\n", drp[0]);
+            printf("PASSWORD is now %ld\n", drp[2]);
+        }
+    }
+
+    fclose(fptr);
+
+    return (0);
+}

aoc_25_1_2/src/left.s

@@ -0,0 +1,29 @@
+    .global    left
+    .type      left, "function"
+    .p2align   4
+
+left:
+    ldr x1, [x0]
+    ldr x2, [x0, #8]
+    ldr x3, [x0, #16]
+    b left1
+left1:
+    subs x1, x1, #1
+    b.eq pass0
+    b.lt loop99
+    b rotate
+pass0:
+    add x3, x3, #1
+    b rotate
+loop99:
+    mov x1, #99
+    b rotate
+rotate:
+    subs x2, x2, #1
+    b.eq finish
+    b left1
+finish:
+    str x1, [x0]
+    str x3, [x0, #16]
+    mov x0, xzr
+    ret

aoc_25_1_2/src/right.s

@@ -0,0 +1,27 @@
+    .global    right
+    .type      right, "function"
+    .p2align   4
+
+right:
+    ldr x1, [x0]
+    ldr x2, [x0, #8]
+    ldr x3, [x0, #16]
+    b right1
+right1:
+    adds x1, x1, #1
+    cmp x1, #99
+    b.gt loop0
+    b rotate
+loop0:
+    mov x1, xzr
+    add x3, x3, #1
+    b rotate
+rotate:
+    subs x2, x2, #1
+    b.eq finish
+    b right1
+finish:
+    str x1, [x0]
+    str x3, [x0, #16]
+    mov x0, xzr
+    ret