Add integer and bit math utilities

1 files changed, 64 insertions, 0 deletions

diff --git a/tests/int_math_test.c b/tests/int_math_test.c
new file mode 100644
index 00000000..188559eb
--- /dev/null
+++ b/tests/int_math_test.c
@@ -0,0 +1,64 @@
+/*
+  Copyright 2019-2020 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#undef NDEBUG
+
+#include "../src/int_math.h"
+
+#include <assert.h>
+
+static void
+test_clz32(void)
+{
+	for (unsigned i = 0; i < 32; ++i) {
+		assert(serd_clz32(1u << i) == 32u - i - 1u);
+	}
+}
+
+static void
+test_clz64(void)
+{
+	for (unsigned i = 0; i < 64; ++i) {
+		assert(serd_clz64(1ull << i) == 64u - i - 1u);
+	}
+}
+
+static void
+test_ilog2(void)
+{
+	for (unsigned i = 0; i < 64; ++i) {
+		assert(serd_ilog2(1ull << i) == i);
+	}
+}
+
+static void
+test_ilog10(void)
+{
+	uint64_t power = 1;
+	for (unsigned i = 0; i < 20; ++i, power *= 10) {
+		assert(serd_ilog10(power) == i);
+	}
+}
+
+int
+main(void)
+{
+	test_clz32();
+	test_clz64();
+	test_ilog2();
+	test_ilog10();
+	return 0;
+}