1 files changed, 97 insertions, 0 deletions
diff --git a/subprojects/exess/test/test_int_math.c b/subprojects/exess/test/test_int_math.c
new file mode 100644
index 00000000..8ab3f63f
--- /dev/null
+++ b/subprojects/exess/test/test_int_math.c
@@ -0,0 +1,97 @@
+/*
+  Copyright 2019-2021 David Robillard <d@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 "attributes.h"
+#include "int_math.h"
+
+#include <assert.h>
+#include <stdint.h>
+
+static void
+test_clz32(void)
+{
+  for (unsigned i = 0; i < 32; ++i) {
+    assert(exess_clz32(1u << i) == 32u - i - 1u);
+  }
+}
+
+static void
+test_clz64(void)
+{
+  for (unsigned i = 0; i < 64; ++i) {
+    assert(exess_clz64(1ull << i) == 64u - i - 1u);
+  }
+}
+
+static void
+test_ilog2(void)
+{
+  for (unsigned i = 0; i < 64; ++i) {
+    assert(exess_ilog2(1ull << i) == i);
+  }
+}
+
+static void
+test_ilog10(void)
+{
+  uint64_t power = 1;
+  for (unsigned i = 0; i < 20; ++i, power *= 10) {
+    assert(exess_ilog10(power) == i);
+  }
+}
+
+static void
+test_num_digits(void)
+{
+  assert(1 == exess_num_digits(0));
+  assert(1 == exess_num_digits(1));
+  assert(1 == exess_num_digits(9));
+  assert(2 == exess_num_digits(10));
+  assert(2 == exess_num_digits(99ull));
+  assert(3 == exess_num_digits(999ull));
+  assert(4 == exess_num_digits(9999ull));
+  assert(5 == exess_num_digits(99999ull));
+  assert(6 == exess_num_digits(999999ull));
+  assert(7 == exess_num_digits(9999999ull));
+  assert(8 == exess_num_digits(99999999ull));
+  assert(9 == exess_num_digits(999999999ull));
+  assert(10 == exess_num_digits(9999999999ull));
+  assert(11 == exess_num_digits(99999999999ull));
+  assert(12 == exess_num_digits(999999999999ull));
+  assert(13 == exess_num_digits(9999999999999ull));
+  assert(14 == exess_num_digits(99999999999999ull));
+  assert(15 == exess_num_digits(999999999999999ull));
+  assert(16 == exess_num_digits(9999999999999999ull));
+  assert(17 == exess_num_digits(99999999999999999ull));
+  assert(18 == exess_num_digits(999999999999999999ull));
+  assert(19 == exess_num_digits(9999999999999999999ull));
+  assert(20 == exess_num_digits(18446744073709551615ull));
+}
+
+EXESS_I_PURE_FUNC
+int
+main(void)
+{
+  test_clz32();
+  test_clz64();
+  test_ilog2();
+  test_ilog10();
+  test_num_digits();
+
+  return 0;
+}