mirror of
https://github.com/encounter/dawn-cmake.git
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86 lines
2.3 KiB
C++
86 lines
2.3 KiB
C++
// Copyright 2017 The NXT Authors
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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 <gtest/gtest.h>
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#include "common/Math.h"
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using namespace backend;
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// Tests for ScanForward
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TEST(Math, ScanForward) {
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// Test extrema
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ASSERT_EQ(ScanForward(1), 0);
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ASSERT_EQ(ScanForward(0x8000000000000000), 63);
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// Test with more than one bit set.
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ASSERT_EQ(ScanForward(256), 8);
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ASSERT_EQ(ScanForward(256 + 32), 5);
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ASSERT_EQ(ScanForward(1024 + 256 + 32), 5);
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}
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// Tests for Log2
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TEST(Math, Log2) {
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// Test extrema
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ASSERT_EQ(Log2(1), 0);
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ASSERT_EQ(Log2(0xFFFFFFFF), 31);
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// Test boundary between two logs
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ASSERT_EQ(Log2(0x80000000), 31);
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ASSERT_EQ(Log2(0x7FFFFFFF), 30);
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ASSERT_EQ(Log2(16), 4);
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ASSERT_EQ(Log2(15), 3);
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}
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// Tests for IsPowerOfTwo
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TEST(Math, IsPowerOfTwo) {
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ASSERT_TRUE(IsPowerOfTwo(1));
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ASSERT_TRUE(IsPowerOfTwo(2));
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ASSERT_FALSE(IsPowerOfTwo(3));
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ASSERT_TRUE(IsPowerOfTwo(0x8000000));
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ASSERT_FALSE(IsPowerOfTwo(0x8000400));
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}
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// Tests for Align
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TEST(Math, Align) {
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constexpr size_t kTestAlignment = 8;
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char buffer[kTestAlignment * 4];
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for (size_t i = 0; i < 2 * kTestAlignment; ++i) {
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char* unaligned = &buffer[i];
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char* aligned = Align(unaligned, kTestAlignment);
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ASSERT_GE(aligned - unaligned, 0);
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ASSERT_LT(aligned - unaligned, kTestAlignment);
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ASSERT_EQ(reinterpret_cast<intptr_t>(aligned) & (kTestAlignment -1), 0);
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}
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}
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// Tests for IsAligned
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TEST(Math, IsAligned) {
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constexpr size_t kTestAlignment = 8;
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char buffer[kTestAlignment * 4];
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for (size_t i = 0; i < 2 * kTestAlignment; ++i) {
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char* unaligned = &buffer[i];
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char* aligned = Align(unaligned, kTestAlignment);
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ASSERT_EQ(IsAligned(unaligned, kTestAlignment), unaligned == aligned);
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}
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}
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