dummy eval func (pieces + square control), bit ops, shorter int types

2021-11-09 20:57:18 +01:00
parent e55c2e9cbe
commit 5623dc78a5
11 changed files with 386 additions and 29 deletions
--- a/src/bits.c
+++ b/src/bits.c
@@ -0,0 +1,81 @@
+/* bits.c - bits.h tests
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.htmlL>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include "bits.h"
+
+#ifdef BIN_bits
+#include <stdio.h>
+#include <stdlib.h>
+
+static inline int _popcount64(u64 n)
+{
+    int count = 0;
+    while (n) {
+        count++;
+        n &= (n - 1);
+    }
+    return count;
+}
+
+static inline int _ctz64(u64 n)
+{
+    return _popcount64((n & -n) - 1);
+}
+
+static inline int _clz64(u64 n)
+{
+    u64 r, q;
+
+    r = (n > 0xFFFFFFFF) << 5; n >>= r;
+    q = (n > 0xFFFF)     << 4; n >>= q; r |= q;
+    q = (n > 0xFF  )     << 3; n >>= q; r |= q;
+    q = (n > 0xF   )     << 2; n >>= q; r |= q;
+    q = (n > 0x3   )     << 1; n >>= q; r |= q;
+    r |= (n >> 1);
+   return __WORDSIZE - r - 1;
+}
+
+static inline int _ffs64(u64 n)
+{
+    if (n == 0)
+        return (0);
+
+    return _popcount64(n ^ ~-n);
+}
+
+
+int main(int ac, char **av)
+{
+    u64 u = 123, _tmp;
+    int curbit;
+    int base = 10;
+    debug_init(0);
+    if (ac > 2)
+        base = atoi(*(av+2));
+    if (ac > 1) {
+        u = strtoul(*(av+1), NULL, base);
+        printf("base=%d input=%#lx\n", base, u);
+        printf("popcount64(%lu) = %d/%d\n", u, popcount64(u), _popcount64(u));
+        printf("ctz64(%lu) = %d/%d\n", u, ctz64(u), _ctz64(u));
+        printf("clz64(%lu) = %d/%d\n", u, clz64(u), _clz64(u));
+        printf("ffs64(%lu) = %d/%d\n", u, ffs64(u), _ffs64(u));
+        printf("\n");
+
+        bit_for_each64(curbit, _tmp, u) {
+            printf("loop: curbit=%d\n", curbit);
+        }
+
+    }
+    return 0;
+}
+#endif  /* BIN_bits */