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