| // Copyright 2017 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "internal/bit_utils.h" |
| |
| #include "gtest/gtest.h" |
| |
| namespace cpu_features { |
| namespace { |
| |
| TEST(UtilsTest, IsBitSet) { |
| for (size_t bit_set = 0; bit_set < 32; ++bit_set) { |
| const uint32_t value = 1UL << bit_set; |
| for (uint32_t i = 0; i < 32; ++i) { |
| EXPECT_EQ(IsBitSet(value, i), i == bit_set); |
| } |
| } |
| |
| // testing 0, all bits should be 0. |
| for (uint32_t i = 0; i < 32; ++i) { |
| EXPECT_FALSE(IsBitSet(0, i)); |
| } |
| |
| // testing ~0, all bits should be 1. |
| for (uint32_t i = 0; i < 32; ++i) { |
| EXPECT_TRUE(IsBitSet(-1, i)); |
| } |
| } |
| |
| TEST(UtilsTest, ExtractBitRange) { |
| // Extracting all bits gives the same number. |
| EXPECT_EQ(ExtractBitRange(123, 31, 0), 123); |
| // Extracting 1 bit gives parity. |
| EXPECT_EQ(ExtractBitRange(123, 0, 0), 1); |
| EXPECT_EQ(ExtractBitRange(122, 0, 0), 0); |
| |
| EXPECT_EQ(ExtractBitRange(0xF0, 7, 4), 0xF); |
| EXPECT_EQ(ExtractBitRange(0x42 << 2, 10, 2), 0x42); |
| } |
| |
| } // namespace |
| } // namespace cpu_features |