1//===-- Benchmark Memory Test ---------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "LibcMemoryBenchmark.h"
10#include "llvm/Support/Alignment.h"
11#include "gmock/gmock.h"
12#include "gtest/gtest.h"
13#include <optional>
14
15using testing::AllOf;
16using testing::AnyOf;
17using testing::ElementsAre;
18using testing::Ge;
19using testing::Gt;
20using testing::Le;
21using testing::Lt;
22
23namespace llvm {
24namespace libc_benchmarks {
25namespace {
26
27TEST(AlignedBuffer, IsAligned) {
28 AlignedBuffer AB(0);
29 EXPECT_TRUE(isAddrAligned(Lhs: Align(AlignedBuffer::Alignment), Addr: AB.begin()));
30}
31
32TEST(AlignedBuffer, Empty) {
33 AlignedBuffer AB(0);
34 EXPECT_EQ(std::distance(first: AB.begin(), last: AB.end()), 0U);
35}
36
37TEST(OffsetDistribution, AlignToBegin) {
38 const size_t BufferSize = 8192;
39 OffsetDistribution OD(BufferSize, 1024, std::nullopt);
40 std::default_random_engine Gen;
41 for (size_t I = 0; I <= 10; ++I)
42 EXPECT_EQ(OD(Gen), 0U);
43}
44
45TEST(OffsetDistribution, NoAlignment) {
46 const size_t BufferSize = 8192;
47 OffsetDistribution OD(BufferSize, 1, Align(1));
48 std::default_random_engine Gen;
49 for (size_t I = 0; I <= 10; ++I)
50 EXPECT_THAT(OD(Gen), AllOf(Ge(0U), Lt(8192U)));
51}
52
53MATCHER_P(IsDivisibleBy, n, "") {
54 *result_listener << "where the remainder is " << (arg % n);
55 return (arg % n) == 0;
56}
57
58TEST(OffsetDistribution, Aligned) {
59 const size_t BufferSize = 8192;
60 OffsetDistribution OD(BufferSize, 1, Align(16));
61 std::default_random_engine Gen;
62 for (size_t I = 0; I <= 10; ++I)
63 EXPECT_THAT(OD(Gen), AllOf(Ge(0U), Lt(8192U), IsDivisibleBy(16U)));
64}
65
66TEST(MismatchOffsetDistribution, EqualBufferDisablesDistribution) {
67 const size_t BufferSize = 8192;
68 const uint32_t MismatchAt = 0; // buffer are equal.
69
70 MismatchOffsetDistribution MOD(BufferSize, 1024, MismatchAt);
71 EXPECT_FALSE(MOD);
72}
73
74TEST(MismatchOffsetDistribution, DifferentBufferDisablesDistribution) {
75 const size_t BufferSize = 8192;
76 const uint32_t MismatchAt = 1; // buffer are different.
77
78 MismatchOffsetDistribution MOD(BufferSize, 1024, MismatchAt);
79 EXPECT_FALSE(MOD);
80}
81
82TEST(MismatchOffsetDistribution, MismatchAt2) {
83 const size_t BufferSize = 16;
84 const uint32_t MismatchAt = 2; // buffer are different at position 2.
85 const uint32_t MaxSize = 4;
86
87 MismatchOffsetDistribution MOD(BufferSize, MaxSize, MismatchAt);
88 EXPECT_TRUE(MOD);
89 // We test equality up to MaxSize (=4) so we need spans of 4 equal bytes
90 // spaced by one mismatch.
91 EXPECT_THAT(MOD.getMismatchIndices(), ElementsAre(5, 9, 13));
92 std::default_random_engine Gen;
93 for (size_t Iterations = 0; Iterations <= 10; ++Iterations) {
94 for (size_t Size = 0; Size <= MaxSize; ++Size) {
95 if (Size >= MismatchAt)
96 EXPECT_THAT(MOD(Gen, Size),
97 AnyOf(5 - MismatchAt, 9 - MismatchAt, 13 - MismatchAt));
98 else
99 EXPECT_THAT(MOD(Gen, Size),
100 AnyOf(5 - Size - 1, 9 - Size - 1, 13 - Size - 1));
101 }
102 }
103}
104
105} // namespace
106} // namespace libc_benchmarks
107} // namespace llvm
108

source code of libc/benchmarks/LibcMemoryBenchmarkTest.cpp