163 lines
6.3 KiB
C++
163 lines
6.3 KiB
C++
/*
|
|
* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
#include "precompiled.hpp"
|
|
|
|
#include "utilities/globalDefinitions.hpp"
|
|
#include "utilities/powerOfTwo.hpp"
|
|
#include "unittest.hpp"
|
|
|
|
template <typename T> T max_pow2() {
|
|
T max_val = max_value<T>();
|
|
return max_val - (max_val >> 1);
|
|
}
|
|
|
|
template <typename T> void round_up_power_of_2() {
|
|
EXPECT_EQ(round_up_power_of_2(T(1)), T(1)) << "value = " << T(1);
|
|
EXPECT_EQ(round_up_power_of_2(T(2)), T(2)) << "value = " << T(2);
|
|
EXPECT_EQ(round_up_power_of_2(T(3)), T(4)) << "value = " << T(3);
|
|
EXPECT_EQ(round_up_power_of_2(T(4)), T(4)) << "value = " << T(4);
|
|
EXPECT_EQ(round_up_power_of_2(T(5)), T(8)) << "value = " << T(5);
|
|
EXPECT_EQ(round_up_power_of_2(T(6)), T(8)) << "value = " << T(6);
|
|
EXPECT_EQ(round_up_power_of_2(T(7)), T(8)) << "value = " << T(7);
|
|
EXPECT_EQ(round_up_power_of_2(T(8)), T(8)) << "value = " << T(8);
|
|
EXPECT_EQ(round_up_power_of_2(T(9)), T(16)) << "value = " << T(9);
|
|
EXPECT_EQ(round_up_power_of_2(T(10)), T(16)) << "value = " << T(10);
|
|
|
|
T t_max_pow2 = max_pow2<T>();
|
|
|
|
// round_up(any power of two) should return input
|
|
for (T pow2 = T(1); pow2 < t_max_pow2; pow2 *= 2) {
|
|
EXPECT_EQ(pow2, round_up_power_of_2(pow2))
|
|
<< "value = " << pow2;
|
|
}
|
|
EXPECT_EQ(round_up_power_of_2(t_max_pow2), t_max_pow2)
|
|
<< "value = " << (t_max_pow2);
|
|
|
|
// For each pow2 gt 2, round_up(pow2 - 1) should return pow2
|
|
for (T pow2 = T(4); pow2 < t_max_pow2; pow2 *= 2) {
|
|
EXPECT_EQ(pow2, round_up_power_of_2(pow2 - 1))
|
|
<< "value = " << pow2;
|
|
}
|
|
EXPECT_EQ(round_up_power_of_2(t_max_pow2 - 1), t_max_pow2)
|
|
<< "value = " << (t_max_pow2 - 1);
|
|
|
|
}
|
|
|
|
TEST(power_of_2, round_up_power_of_2) {
|
|
round_up_power_of_2<int8_t>();
|
|
round_up_power_of_2<int16_t>();
|
|
round_up_power_of_2<int32_t>();
|
|
round_up_power_of_2<int64_t>();
|
|
round_up_power_of_2<uint8_t>();
|
|
round_up_power_of_2<uint16_t>();
|
|
round_up_power_of_2<uint32_t>();
|
|
round_up_power_of_2<uint64_t>();
|
|
}
|
|
|
|
template <typename T> void round_down_power_of_2() {
|
|
EXPECT_EQ(round_down_power_of_2(T(1)), T(1)) << "value = " << T(1);
|
|
EXPECT_EQ(round_down_power_of_2(T(2)), T(2)) << "value = " << T(2);
|
|
EXPECT_EQ(round_down_power_of_2(T(3)), T(2)) << "value = " << T(3);
|
|
EXPECT_EQ(round_down_power_of_2(T(4)), T(4)) << "value = " << T(4);
|
|
EXPECT_EQ(round_down_power_of_2(T(5)), T(4)) << "value = " << T(5);
|
|
EXPECT_EQ(round_down_power_of_2(T(6)), T(4)) << "value = " << T(6);
|
|
EXPECT_EQ(round_down_power_of_2(T(7)), T(4)) << "value = " << T(7);
|
|
EXPECT_EQ(round_down_power_of_2(T(8)), T(8)) << "value = " << T(8);
|
|
EXPECT_EQ(round_down_power_of_2(T(9)), T(8)) << "value = " << T(9);
|
|
EXPECT_EQ(round_down_power_of_2(T(10)), T(8)) << "value = " << T(10);
|
|
|
|
T t_max_pow2 = max_pow2<T>();
|
|
|
|
// For each pow2 >= 2:
|
|
// - round_down(pow2) should return pow2
|
|
// - round_down(pow2 + 1) should return pow2
|
|
// - round_down(pow2 - 1) should return pow2 / 2
|
|
for (T pow2 = T(2); pow2 < t_max_pow2; pow2 = pow2 * 2) {
|
|
EXPECT_EQ(pow2, round_down_power_of_2(pow2))
|
|
<< "value = " << pow2;
|
|
EXPECT_EQ(pow2, round_down_power_of_2(pow2 + 1))
|
|
<< "value = " << pow2;
|
|
EXPECT_EQ(pow2 / 2, round_down_power_of_2(pow2 - 1))
|
|
<< "value = " << (pow2 / 2);
|
|
}
|
|
EXPECT_EQ(round_down_power_of_2(t_max_pow2), t_max_pow2)
|
|
<< "value = " << (t_max_pow2);
|
|
EXPECT_EQ(round_down_power_of_2(t_max_pow2 + 1), t_max_pow2)
|
|
<< "value = " << (t_max_pow2 + 1);
|
|
EXPECT_EQ(round_down_power_of_2(t_max_pow2 - 1), t_max_pow2 / 2)
|
|
<< "value = " << (t_max_pow2 - 1);
|
|
}
|
|
|
|
TEST(power_of_2, round_down_power_of_2) {
|
|
round_down_power_of_2<int8_t>();
|
|
round_down_power_of_2<int16_t>();
|
|
round_down_power_of_2<int32_t>();
|
|
round_down_power_of_2<int64_t>();
|
|
round_down_power_of_2<uint8_t>();
|
|
round_down_power_of_2<uint16_t>();
|
|
round_down_power_of_2<uint32_t>();
|
|
round_down_power_of_2<uint64_t>();
|
|
}
|
|
|
|
template <typename T> void next_power_of_2() {
|
|
EXPECT_EQ(next_power_of_2(T(0)), T(1)) << "value = " << T(0);
|
|
EXPECT_EQ(next_power_of_2(T(1)), T(2)) << "value = " << T(1);
|
|
EXPECT_EQ(next_power_of_2(T(2)), T(4)) << "value = " << T(2);
|
|
EXPECT_EQ(next_power_of_2(T(3)), T(4)) << "value = " << T(3);
|
|
EXPECT_EQ(next_power_of_2(T(4)), T(8)) << "value = " << T(4);
|
|
EXPECT_EQ(next_power_of_2(T(5)), T(8)) << "value = " << T(5);
|
|
EXPECT_EQ(next_power_of_2(T(6)), T(8)) << "value = " << T(6);
|
|
EXPECT_EQ(next_power_of_2(T(7)), T(8)) << "value = " << T(7);
|
|
EXPECT_EQ(next_power_of_2(T(8)), T(16)) << "value = " << T(8);
|
|
EXPECT_EQ(next_power_of_2(T(9)), T(16)) << "value = " << T(9);
|
|
EXPECT_EQ(next_power_of_2(T(10)), T(16)) << "value = " << T(10);
|
|
|
|
T t_max_pow2 = max_pow2<T>();
|
|
|
|
// next(pow2 - 1) should return pow2
|
|
for (T pow2 = T(1); pow2 < t_max_pow2; pow2 = pow2 * 2) {
|
|
EXPECT_EQ(pow2, next_power_of_2(pow2 - 1))
|
|
<< "value = " << pow2 - 1;
|
|
}
|
|
EXPECT_EQ(next_power_of_2(t_max_pow2 - 1), t_max_pow2)
|
|
<< "value = " << (t_max_pow2 - 1);
|
|
|
|
// next(pow2) should return pow2 * 2
|
|
for (T pow2 = T(1); pow2 < t_max_pow2 / 2; pow2 = pow2 * 2) {
|
|
EXPECT_EQ(pow2 * 2, next_power_of_2(pow2))
|
|
<< "value = " << pow2;
|
|
}
|
|
}
|
|
|
|
TEST(power_of_2, next_power_of_2) {
|
|
next_power_of_2<int8_t>();
|
|
next_power_of_2<int16_t>();
|
|
next_power_of_2<int32_t>();
|
|
next_power_of_2<int64_t>();
|
|
next_power_of_2<uint8_t>();
|
|
next_power_of_2<uint16_t>();
|
|
next_power_of_2<uint32_t>();
|
|
next_power_of_2<uint64_t>();
|
|
}
|