1 // Copyright 2018 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include "src/base/math_utils.h"
16
17 #include <gtest/gtest.h>
18
19 namespace astc_codec {
20 namespace base {
21
TEST(MathUtils,Log2Floor)22 TEST(MathUtils, Log2Floor) {
23 EXPECT_EQ(-1, Log2Floor(0));
24
25 for (int i = 0; i < 32; i++) {
26 uint32_t n = 1U << i;
27 EXPECT_EQ(i, Log2Floor(n));
28 if (n > 2) {
29 EXPECT_EQ(i - 1, Log2Floor(n - 1));
30 EXPECT_EQ(i, Log2Floor(n + 1));
31 }
32 }
33 }
34
TEST(MathUtils,CountOnes)35 TEST(MathUtils, CountOnes) {
36 EXPECT_EQ(0, CountOnes(0));
37 EXPECT_EQ(1, CountOnes(1));
38 EXPECT_EQ(32, CountOnes(static_cast<uint32_t>(~0U)));
39 EXPECT_EQ(1, CountOnes(0x8000000));
40
41 for (int i = 0; i < 32; i++) {
42 EXPECT_EQ(1, CountOnes(1U << i));
43 EXPECT_EQ(31, CountOnes(static_cast<uint32_t>(~0U) ^ (1U << i)));
44 }
45 }
46
TEST(MathUtils,ReverseBits)47 TEST(MathUtils, ReverseBits) {
48 EXPECT_EQ(ReverseBits(0u), 0u);
49 EXPECT_EQ(ReverseBits(1u), 1u << 31);
50 EXPECT_EQ(ReverseBits(0xffffffff), 0xffffffff);
51 EXPECT_EQ(ReverseBits(0x00000001), 0x80000000);
52 EXPECT_EQ(ReverseBits(0x80000000), 0x00000001);
53 EXPECT_EQ(ReverseBits(0xaaaaaaaa), 0x55555555);
54 EXPECT_EQ(ReverseBits(0x55555555), 0xaaaaaaaa);
55 EXPECT_EQ(ReverseBits(0x7d5d7f53), 0xcafebabe);
56 EXPECT_EQ(ReverseBits(0xcafebabe), 0x7d5d7f53);
57 }
58
TEST(MathUtils,GetBits)59 TEST(MathUtils, GetBits) {
60 EXPECT_EQ(GetBits(0u, 0, 1), 0u);
61 EXPECT_EQ(GetBits(0u, 0, 32), 0u);
62 EXPECT_EQ(GetBits(0x00000001u, 0, 1), 0x00000001);
63 EXPECT_EQ(GetBits(0x00000001u, 0, 32), 0x00000001);
64 EXPECT_EQ(GetBits(0x00000001u, 1, 31), 0x00000000);
65 EXPECT_EQ(GetBits(0x00000001u, 31, 1), 0x00000000);
66
67 EXPECT_DEBUG_DEATH(GetBits(0x00000000u, 1, 32), "");
68 EXPECT_DEBUG_DEATH(GetBits(0x00000000u, 32, 0), "");
69 EXPECT_DEBUG_DEATH(GetBits(0x00000000u, 32, 1), "");
70
71 EXPECT_EQ(GetBits(0XFFFFFFFFu, 0, 4), 0x0000000F);
72 EXPECT_EQ(GetBits(0XFFFFFFFFu, 16, 16), 0xFFFF);
73 EXPECT_EQ(GetBits(0x80000000u, 31, 1), 1);
74 EXPECT_EQ(GetBits(0xCAFEBABEu, 24, 8), 0xCA);
75 }
76
77 } // namespace base
78 } // namespace astc_codec
79