mfbt/tests/TestCountPopulation.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/MathAlgorithms.h"
   8
   9 using mozilla::CountPopulation32;
  10
  11 static void TestCountPopulation32() {
  12   MOZ_RELEASE_ASSERT(CountPopulation32(0xFFFFFFFF) == 32);
  13   MOZ_RELEASE_ASSERT(CountPopulation32(0xF0FF1000) == 13);
  14   MOZ_RELEASE_ASSERT(CountPopulation32(0x7F8F0001) == 13);
  15   MOZ_RELEASE_ASSERT(CountPopulation32(0x3FFF0100) == 15);
  16   MOZ_RELEASE_ASSERT(CountPopulation32(0x1FF50010) == 12);
  17   MOZ_RELEASE_ASSERT(CountPopulation32(0x00800000) == 1);
  18   MOZ_RELEASE_ASSERT(CountPopulation32(0x00400000) == 1);
  19   MOZ_RELEASE_ASSERT(CountPopulation32(0x00008000) == 1);
  20   MOZ_RELEASE_ASSERT(CountPopulation32(0x00004000) == 1);
  21   MOZ_RELEASE_ASSERT(CountPopulation32(0x00000080) == 1);
  22   MOZ_RELEASE_ASSERT(CountPopulation32(0x00000040) == 1);
  23   MOZ_RELEASE_ASSERT(CountPopulation32(0x00000001) == 1);
  24   MOZ_RELEASE_ASSERT(CountPopulation32(0x00000000) == 0);
  25 }
  26
  27 int main() {
  28   TestCountPopulation32();
  29   return 0;
  30 }