108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
//===-- Benchmark Memory Test ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "LibcMemoryBenchmark.h"
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#include "llvm/Support/Alignment.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include <optional>
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using testing::AllOf;
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using testing::AnyOf;
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using testing::ElementsAre;
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using testing::Ge;
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using testing::Gt;
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using testing::Le;
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using testing::Lt;
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namespace llvm {
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namespace libc_benchmarks {
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namespace {
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TEST(AlignedBuffer, IsAligned) {
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AlignedBuffer AB(0);
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EXPECT_TRUE(isAddrAligned(Align(AlignedBuffer::Alignment), AB.begin()));
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}
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TEST(AlignedBuffer, Empty) {
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AlignedBuffer AB(0);
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EXPECT_EQ(std::distance(AB.begin(), AB.end()), 0U);
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}
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TEST(OffsetDistribution, AlignToBegin) {
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const size_t BufferSize = 8192;
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OffsetDistribution OD(BufferSize, 1024, std::nullopt);
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std::default_random_engine Gen;
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for (size_t I = 0; I <= 10; ++I)
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EXPECT_EQ(OD(Gen), 0U);
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}
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TEST(OffsetDistribution, NoAlignment) {
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const size_t BufferSize = 8192;
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OffsetDistribution OD(BufferSize, 1, Align(1));
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std::default_random_engine Gen;
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for (size_t I = 0; I <= 10; ++I)
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EXPECT_THAT(OD(Gen), AllOf(Ge(0U), Lt(8192U)));
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}
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MATCHER_P(IsDivisibleBy, n, "") {
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*result_listener << "where the remainder is " << (arg % n);
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return (arg % n) == 0;
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}
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TEST(OffsetDistribution, Aligned) {
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const size_t BufferSize = 8192;
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OffsetDistribution OD(BufferSize, 1, Align(16));
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std::default_random_engine Gen;
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for (size_t I = 0; I <= 10; ++I)
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EXPECT_THAT(OD(Gen), AllOf(Ge(0U), Lt(8192U), IsDivisibleBy(16U)));
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}
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TEST(MismatchOffsetDistribution, EqualBufferDisablesDistribution) {
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const size_t BufferSize = 8192;
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const uint32_t MismatchAt = 0; // buffer are equal.
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MismatchOffsetDistribution MOD(BufferSize, 1024, MismatchAt);
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EXPECT_FALSE(MOD);
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}
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TEST(MismatchOffsetDistribution, DifferentBufferDisablesDistribution) {
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const size_t BufferSize = 8192;
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const uint32_t MismatchAt = 1; // buffer are different.
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MismatchOffsetDistribution MOD(BufferSize, 1024, MismatchAt);
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EXPECT_FALSE(MOD);
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}
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TEST(MismatchOffsetDistribution, MismatchAt2) {
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const size_t BufferSize = 16;
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const uint32_t MismatchAt = 2; // buffer are different at position 2.
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const uint32_t MaxSize = 4;
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MismatchOffsetDistribution MOD(BufferSize, MaxSize, MismatchAt);
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EXPECT_TRUE(MOD);
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// We test equality up to MaxSize (=4) so we need spans of 4 equal bytes
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// spaced by one mismatch.
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EXPECT_THAT(MOD.getMismatchIndices(), ElementsAre(5, 9, 13));
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std::default_random_engine Gen;
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for (size_t Iterations = 0; Iterations <= 10; ++Iterations) {
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for (size_t Size = 0; Size <= MaxSize; ++Size) {
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if (Size >= MismatchAt)
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EXPECT_THAT(MOD(Gen, Size),
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AnyOf(5 - MismatchAt, 9 - MismatchAt, 13 - MismatchAt));
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else
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EXPECT_THAT(MOD(Gen, Size),
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AnyOf(5 - Size - 1, 9 - Size - 1, 13 - Size - 1));
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}
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}
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}
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} // namespace
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} // namespace libc_benchmarks
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} // namespace llvm
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