}
-// Copies data from |src| to |dst|. No restrictions.
-template <typename T>
-inline void MoveBytes(T* dst, const T* src, size_t num_bytes) {
- STATIC_ASSERT(sizeof(T) == 1);
- switch (num_bytes) {
- case 0: return;
- case 1:
- *dst = *src;
- return;
-#ifdef V8_HOST_CAN_READ_UNALIGNED
- case 2:
- *reinterpret_cast<uint16_t*>(dst) = *reinterpret_cast<const uint16_t*>(src);
- return;
- case 3: {
- uint16_t part1 = *reinterpret_cast<const uint16_t*>(src);
- byte part2 = *(src + 2);
- *reinterpret_cast<uint16_t*>(dst) = part1;
- *(dst + 2) = part2;
- return;
- }
- case 4:
- *reinterpret_cast<uint32_t*>(dst) = *reinterpret_cast<const uint32_t*>(src);
- return;
- case 5:
- case 6:
- case 7:
- case 8: {
- uint32_t part1 = *reinterpret_cast<const uint32_t*>(src);
- uint32_t part2 = *reinterpret_cast<const uint32_t*>(src + num_bytes - 4);
- *reinterpret_cast<uint32_t*>(dst) = part1;
- *reinterpret_cast<uint32_t*>(dst + num_bytes - 4) = part2;
- return;
- }
- case 9:
- case 10:
- case 11:
- case 12:
- case 13:
- case 14:
- case 15:
- case 16: {
- double part1 = *reinterpret_cast<const double*>(src);
- double part2 = *reinterpret_cast<const double*>(src + num_bytes - 8);
- *reinterpret_cast<double*>(dst) = part1;
- *reinterpret_cast<double*>(dst + num_bytes - 8) = part2;
- return;
- }
-#endif
- default:
- OS::MemMove(dst, src, num_bytes);
- return;
- }
-}
-
-
template <typename T, typename U>
inline void MemsetPointer(T** dest, U* value, int counter) {
#ifdef DEBUG
void TestMemMove(byte* area1,
byte* area2,
- byte* area3,
int src_offset,
int dest_offset,
int length) {
for (int i = 0; i < kAreaSize; i++) {
area1[i] = i & 0xFF;
area2[i] = i & 0xFF;
- area3[i] = i & 0xFF;
}
OS::MemMove(area1 + dest_offset, area1 + src_offset, length);
- MoveBytes(area2 + dest_offset, area2 + src_offset, length);
- memmove(area3 + dest_offset, area3 + src_offset, length);
- if (memcmp(area1, area3, kAreaSize) != 0) {
+ memmove(area2 + dest_offset, area2 + src_offset, length);
+ if (memcmp(area1, area2, kAreaSize) != 0) {
printf("OS::MemMove(): src_offset: %d, dest_offset: %d, length: %d\n",
src_offset, dest_offset, length);
for (int i = 0; i < kAreaSize; i++) {
- if (area1[i] == area3[i]) continue;
+ if (area1[i] == area2[i]) continue;
printf("diff at offset %d (%p): is %d, should be %d\n",
- i, reinterpret_cast<void*>(area1 + i), area1[i], area3[i]);
- }
- CHECK(false);
- }
- if (memcmp(area2, area3, kAreaSize) != 0) {
- printf("MoveBytes(): src_offset: %d, dest_offset: %d, length: %d\n",
- src_offset, dest_offset, length);
- for (int i = 0; i < kAreaSize; i++) {
- if (area2[i] == area3[i]) continue;
- printf("diff at offset %d (%p): is %d, should be %d\n",
- i, reinterpret_cast<void*>(area2 + i), area2[i], area3[i]);
+ i, reinterpret_cast<void*>(area1 + i), area1[i], area2[i]);
}
CHECK(false);
}
v8::V8::Initialize();
byte* area1 = new byte[kAreaSize];
byte* area2 = new byte[kAreaSize];
- byte* area3 = new byte[kAreaSize];
static const int kMinOffset = 32;
static const int kMaxOffset = 64;
for (int src_offset = kMinOffset; src_offset <= kMaxOffset; src_offset++) {
for (int dst_offset = kMinOffset; dst_offset <= kMaxOffset; dst_offset++) {
for (int length = 0; length <= kMaxLength; length++) {
- TestMemMove(area1, area2, area3, src_offset, dst_offset, length);
+ TestMemMove(area1, area2, src_offset, dst_offset, length);
}
}
}
delete[] area1;
delete[] area2;
- delete[] area3;
}