/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* 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
*
* http://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 <stdlib.h>
#include <cstddef>
#include <folly/FollyMemset.h>
#include <folly/portability/GTest.h>
constexpr size_t kPageSize = 4096;
constexpr uint8_t kBufEnd = 0xDB;
// memset implementation test with 0xFF pattern
// buf must have an extra byte to be filled with magic constant
void testMemsetImpl(uint8_t* buf, size_t maxLen) {
for (size_t len = 0; len < maxLen; len++) {
for (size_t i = 0; i < maxLen; i++) {
buf[i] = 0x0;
}
buf[len] = kBufEnd;
auto* p = folly::__folly_memset(buf, 0xFF, len);
EXPECT_EQ(buf, reinterpret_cast<uint8_t*>(p));
bool isEq = true;
for (size_t i = 0; i < len; i++) {
isEq &= buf[i] == 0xFF;
}
EXPECT_TRUE(isEq);
EXPECT_EQ(buf[len], kBufEnd);
}
}
TEST(MemsetAsmTest, alignedBuffer) {
constexpr size_t kMaxSize = 2 * kPageSize;
uint8_t* buf = reinterpret_cast<uint8_t*>(
aligned_alloc(kPageSize, kMaxSize + 2 * kPageSize));
// Get buffer aligned power of 2 from 16 all the way up to a page size
for (size_t alignment = 16; alignment <= kPageSize; alignment <<= 1) {
testMemsetImpl(buf + (alignment % kPageSize), kMaxSize);
}
free(buf);
}
TEST(MemsetAsmTest, unalignedBuffer) {
uint8_t* buf =
reinterpret_cast<uint8_t*>(aligned_alloc(kPageSize, 2 * kPageSize));
for (size_t alignment = 1; alignment <= 192; alignment++) {
testMemsetImpl(buf + alignment, 256);
}
free(buf);
}