// Copyright 2017 Google Inc. // // 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 (size_t i = 0; i < 32; ++i) { EXPECT_EQ(IsBitSet(value, i), i == bit_set); } } // testing 0, all bits should be 0. for (size_t i = 0; i < 32; ++i) { EXPECT_FALSE(IsBitSet(0, i)); } // testing ~0, all bits should be 1. for (size_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