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// Copyright 2022 The Abseil Authors
//
// 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
//
// https://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 "absl/crc/internal/non_temporal_memcpy.h"
#include <algorithm>
#include <cstdint>
#include <iostream>
#include <vector>
#include "gtest/gtest.h"
namespace {
struct TestParam {
size_t copy_size;
uint32_t src_offset;
uint32_t dst_offset;
};
class NonTemporalMemcpyTest : public testing::TestWithParam<TestParam> {
protected:
void SetUp() override {
// Make buf_size multiple of 16 bytes.
size_t buf_size = ((std::max(GetParam().src_offset, GetParam().dst_offset) +
GetParam().copy_size) +
15) /
16 * 16;
a_.resize(buf_size);
b_.resize(buf_size);
for (size_t i = 0; i < buf_size; i++) {
a_[i] = i % 256;
b_[i] = ~a_[i];
}
}
std::vector<uint8_t> a_, b_;
};
TEST_P(NonTemporalMemcpyTest, SSEEquality) {
uint8_t *src = a_.data() + GetParam().src_offset;
uint8_t *dst = b_.data() + GetParam().dst_offset;
absl::crc_internal::non_temporal_store_memcpy(dst, src, GetParam().copy_size);
for (size_t i = 0; i < GetParam().copy_size; i++) {
EXPECT_EQ(src[i], dst[i]);
}
}
TEST_P(NonTemporalMemcpyTest, AVXEquality) {
uint8_t* src = a_.data() + GetParam().src_offset;
uint8_t* dst = b_.data() + GetParam().dst_offset;
absl::crc_internal::non_temporal_store_memcpy_avx(dst, src,
GetParam().copy_size);
for (size_t i = 0; i < GetParam().copy_size; i++) {
EXPECT_EQ(src[i], dst[i]);
}
}
// 63B is smaller than one cacheline operation thus the non-temporal routine
// will not be called.
// 4352B is sufficient for testing 4092B data copy with room for offsets.
constexpr TestParam params[] = {
{63, 0, 0}, {58, 5, 5}, {61, 2, 0}, {61, 0, 2},
{58, 5, 2}, {4096, 0, 0}, {4096, 0, 1}, {4096, 0, 2},
{4096, 0, 3}, {4096, 0, 4}, {4096, 0, 5}, {4096, 0, 6},
{4096, 0, 7}, {4096, 0, 8}, {4096, 0, 9}, {4096, 0, 10},
{4096, 0, 11}, {4096, 0, 12}, {4096, 0, 13}, {4096, 0, 14},
{4096, 0, 15}, {4096, 7, 7}, {4096, 3, 0}, {4096, 1, 0},
{4096, 9, 3}, {4096, 9, 11}, {8192, 0, 0}, {8192, 5, 2},
{1024768, 7, 11}, {1, 0, 0}, {1, 0, 1}, {1, 1, 0},
{1, 1, 1}};
INSTANTIATE_TEST_SUITE_P(ParameterizedNonTemporalMemcpyTest,
NonTemporalMemcpyTest, testing::ValuesIn(params));
} // namespace
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