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-rw-r--r--mfbt/tests/TestCountPopulation.cpp30
1 files changed, 30 insertions, 0 deletions
diff --git a/mfbt/tests/TestCountPopulation.cpp b/mfbt/tests/TestCountPopulation.cpp
new file mode 100644
index 0000000000..23234bbe5a
--- /dev/null
+++ b/mfbt/tests/TestCountPopulation.cpp
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/MathAlgorithms.h"
+
+using mozilla::CountPopulation32;
+
+static void TestCountPopulation32() {
+ MOZ_RELEASE_ASSERT(CountPopulation32(0xFFFFFFFF) == 32);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0xF0FF1000) == 13);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x7F8F0001) == 13);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x3FFF0100) == 15);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x1FF50010) == 12);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00800000) == 1);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00400000) == 1);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00008000) == 1);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00004000) == 1);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00000080) == 1);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00000040) == 1);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00000001) == 1);
+ MOZ_RELEASE_ASSERT(CountPopulation32(0x00000000) == 0);
+}
+
+int main() {
+ TestCountPopulation32();
+ return 0;
+}