add env script, and (stupid) draft tests

test/bitops-test.c

@@ -0,0 +1,46 @@
+/* bits.c - bitops testing.
+ *
+ * Copyright (C) 2024 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.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "br.h"
+#include "bitops.h"
+// #include "cutest/CuTest.h"
+
+static void test_popcount()
+{
+    u32 t32[] = { 0x0,   0x88000101,           0xffffffff           };
+    u64 t64[] = { 0x0ll, 0x8880000000000101LL, 0xffffffffffffffffll };
+
+    for (uint i = 0; i < sizeof(t32); ++i) {
+        printf("popcount 32 (%#x): ", t32[i]);
+#       ifdef ___popcount32_native
+        printf("native:%d ", ___popcount32_native(t32[i]));
+#       endif
+        printf("emulated:%d\n", ___popcount_emulated(t32[i]));
+    }
+    for (uint i = 0; i < sizeof(t64); ++i) {
+        printf("popcount 64 (%#lx): ", t64[i]);
+#       ifdef ___popcount64_native
+        printf("native:%d ", ___popcount64_native(t64[i]));
+#       endif
+        printf("emulated:%d\n", ___popcount_emulated(t64[i]));
+    }
+}
+
+int main()
+{
+    test_popcount();
+    exit(0);
+}