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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/
// This file contains the unit tests for the bit utilities.
#include "base/cross/bits.h"
#include "tests/common/win/testing_common.h"
namespace o3d {
namespace base {
namespace bits {
TEST(Bits, TestLog2Floor) {
EXPECT_EQ(-1, Log2Floor(0));
EXPECT_EQ(0, Log2Floor(1));
EXPECT_EQ(1, Log2Floor(2));
EXPECT_EQ(1, Log2Floor(3));
EXPECT_EQ(2, Log2Floor(4));
for (unsigned int i = 3; i < 31; ++i) {
unsigned int value = 1U << i;
EXPECT_EQ(i, Log2Floor(value));
EXPECT_EQ(i, Log2Floor(value + 1));
EXPECT_EQ(i, Log2Floor(value + 2));
EXPECT_EQ(i - 1, Log2Floor(value - 1));
EXPECT_EQ(i - 1, Log2Floor(value - 2));
}
EXPECT_EQ(31, Log2Floor(0xffffffffU));
}
TEST(Bits, TestLog2Ceiling) {
EXPECT_EQ(-1, Log2Ceiling(0));
EXPECT_EQ(0, Log2Ceiling(1));
EXPECT_EQ(1, Log2Ceiling(2));
EXPECT_EQ(2, Log2Ceiling(3));
EXPECT_EQ(2, Log2Ceiling(4));
for (unsigned int i = 3; i < 31; ++i) {
unsigned int value = 1U << i;
EXPECT_EQ(i, Log2Ceiling(value));
EXPECT_EQ(i + 1, Log2Ceiling(value + 1));
EXPECT_EQ(i + 1, Log2Ceiling(value + 2));
EXPECT_EQ(i, Log2Ceiling(value - 1));
EXPECT_EQ(i, Log2Ceiling(value - 2));
}
EXPECT_EQ(32, Log2Ceiling(0xffffffffU));
}
} // namespace bits
} // namespace base
} // namespace o3d