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#include <torch/csrc/utils/byte_order.h>
#include <c10/util/BFloat16.h>
#include <cstring>
#include <vector>
#if defined(_MSC_VER)
#include <stdlib.h>
#endif
namespace {
static inline void swapBytes16(void *ptr)
{
uint16_t output;
memcpy(&output, ptr, sizeof(uint16_t));
#if defined(_MSC_VER) && !defined(_DEBUG)
output = _byteswap_ushort(output);
#elif defined(__llvm__) || defined(__GNUC__) && !defined(__ICC)
output = __builtin_bswap16(output);
#else
uint16_t Hi = output >> 8;
uint16_t Lo = output << 8;
output = Hi | Lo;
#endif
memcpy(ptr, &output, sizeof(uint16_t));
}
static inline void swapBytes32(void *ptr)
{
uint32_t output;
memcpy(&output, ptr, sizeof(uint32_t));
#if defined(_MSC_VER) && !defined(_DEBUG)
output = _byteswap_ulong(output);
#elif defined(__llvm__) || defined(__GNUC__) && !defined(__ICC)
output = __builtin_bswap32(output);
#else
uint32_t Byte0 = output & 0x000000FF;
uint32_t Byte1 = output & 0x0000FF00;
uint32_t Byte2 = output & 0x00FF0000;
uint32_t Byte3 = output & 0xFF000000;
output = (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
#endif
memcpy(ptr, &output, sizeof(uint32_t));
}
static inline void swapBytes64(void *ptr)
{
uint64_t output;
memcpy(&output, ptr, sizeof(uint64_t));
#if defined(_MSC_VER)
output = _byteswap_uint64(output);
#elif defined(__llvm__) || defined(__GNUC__) && !defined(__ICC)
output = __builtin_bswap64(output);
#else
uint64_t Byte0 = output & 0x00000000000000FF;
uint64_t Byte1 = output & 0x000000000000FF00;
uint64_t Byte2 = output & 0x0000000000FF0000;
uint64_t Byte3 = output & 0x00000000FF000000;
uint64_t Byte4 = output & 0x000000FF00000000;
uint64_t Byte5 = output & 0x0000FF0000000000;
uint64_t Byte6 = output & 0x00FF000000000000;
uint64_t Byte7 = output & 0xFF00000000000000;
output = (Byte0 << (7*8)) | (Byte1 << (5*8)) | (Byte2 << (3*8)) | (Byte3 << (1*8)) |
(Byte7 >> (7*8)) | (Byte6 >> (5*8)) | (Byte5 >> (3*8)) | (Byte4 >> (1*8));
#endif
memcpy(ptr, &output, sizeof(uint64_t));
}
static inline uint16_t decodeUInt16LE(const uint8_t *data) {
uint16_t output;
memcpy(&output, data, sizeof(uint16_t));
return output;
}
static inline uint16_t decodeUInt16BE(const uint8_t *data) {
uint16_t output = decodeUInt16LE(data);
swapBytes16(&output);
return output;
}
static inline uint32_t decodeUInt32LE(const uint8_t *data) {
uint32_t output;
memcpy(&output, data, sizeof(uint32_t));
return output;
}
static inline uint32_t decodeUInt32BE(const uint8_t *data) {
uint32_t output = decodeUInt32LE(data);
swapBytes32(&output);
return output;
}
static inline uint64_t decodeUInt64LE(const uint8_t *data) {
uint64_t output;
memcpy(&output, data, sizeof(uint64_t));
return output;
}
static inline uint64_t decodeUInt64BE(const uint8_t *data) {
uint64_t output = decodeUInt64LE(data);
swapBytes64(&output);
return output;
}
} // anonymous namespace
namespace torch {
namespace utils {
THPByteOrder THP_nativeByteOrder()
{
uint32_t x = 1;
return *(uint8_t*)&x ? THP_LITTLE_ENDIAN : THP_BIG_ENDIAN;
}
void THP_decodeInt16Buffer(int16_t* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
dst[i] = (int16_t)(
order == THP_BIG_ENDIAN ? decodeUInt16BE(src) : decodeUInt16LE(src));
src += sizeof(int16_t);
}
}
void THP_decodeInt32Buffer(int32_t* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
dst[i] = (int32_t)(
order == THP_BIG_ENDIAN ? decodeUInt32BE(src) : decodeUInt32LE(src));
src += sizeof(int32_t);
}
}
void THP_decodeInt64Buffer(int64_t* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
dst[i] = (int64_t)(
order == THP_BIG_ENDIAN ? decodeUInt64BE(src) : decodeUInt64LE(src));
src += sizeof(int64_t);
}
}
void THP_decodeHalfBuffer(THHalf* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
union { uint16_t x; THHalf f; };
x = (order == THP_BIG_ENDIAN ? decodeUInt16BE(src) : decodeUInt16LE(src));
dst[i] = f;
src += sizeof(uint16_t);
}
}
void THP_decodeBFloat16Buffer(at::BFloat16* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
uint16_t x =
(order == THP_BIG_ENDIAN ? decodeUInt16BE(src) : decodeUInt16LE(src));
std::memcpy(&dst[i], &x, sizeof(dst[i]));
src += sizeof(uint16_t);
}
}
void THP_decodeBoolBuffer(bool* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
dst[i] = (int)src[i] != 0 ? true : false;
}
}
void THP_decodeFloatBuffer(float* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
union { uint32_t x; float f; };
x = (order == THP_BIG_ENDIAN ? decodeUInt32BE(src) : decodeUInt32LE(src));
dst[i] = f;
src += sizeof(float);
}
}
void THP_decodeDoubleBuffer(double* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
union { uint64_t x; double d; };
x = (order == THP_BIG_ENDIAN ? decodeUInt64BE(src) : decodeUInt64LE(src));
dst[i] = d;
src += sizeof(double);
}
}
void THP_decodeComplexFloatBuffer(c10::complex<float>* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
union { uint32_t x; float re; };
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
union { uint32_t y; float im; };
x = (order == THP_BIG_ENDIAN ? decodeUInt32BE(src) : decodeUInt32LE(src));
src += sizeof(float);
y = (order == THP_BIG_ENDIAN ? decodeUInt32BE(src) : decodeUInt32LE(src));
src += sizeof(float);
dst[i] = c10::complex<float>(re, im);
}
}
void THP_decodeComplexDoubleBuffer(c10::complex<double>* dst, const uint8_t* src, THPByteOrder order, size_t len)
{
for (size_t i = 0; i < len; i++) {
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
union { uint32_t x; double re; };
// NOLINTNEXTLINE(cppcoreguidelines-pro-type-member-init)
union { uint32_t y; double im; };
x = (order == THP_BIG_ENDIAN ? decodeUInt64BE(src) : decodeUInt64LE(src));
src += sizeof(double);
y = (order == THP_BIG_ENDIAN ? decodeUInt64BE(src) : decodeUInt64LE(src));
src += sizeof(double);
dst[i] = c10::complex<double>(re, im);
}
}
void THP_encodeInt16Buffer(uint8_t* dst, const int16_t* src, THPByteOrder order, size_t len)
{
memcpy(dst, src, sizeof(int16_t) * len);
if (order != THP_nativeByteOrder()) {
for (size_t i = 0; i < len; i++) {
swapBytes16(dst);
dst += sizeof(int16_t);
}
}
}
void THP_encodeInt32Buffer(uint8_t* dst, const int32_t* src, THPByteOrder order, size_t len)
{
memcpy(dst, src, sizeof(int32_t) * len);
if (order != THP_nativeByteOrder()) {
for (size_t i = 0; i < len; i++) {
swapBytes32(dst);
dst += sizeof(int32_t);
}
}
}
void THP_encodeInt64Buffer(uint8_t* dst, const int64_t* src, THPByteOrder order, size_t len)
{
memcpy(dst, src, sizeof(int64_t) * len);
if (order != THP_nativeByteOrder()) {
for (size_t i = 0; i < len; i++) {
swapBytes64(dst);
dst += sizeof(int64_t);
}
}
}
void THP_encodeFloatBuffer(uint8_t* dst, const float* src, THPByteOrder order, size_t len)
{
memcpy(dst, src, sizeof(float) * len);
if (order != THP_nativeByteOrder()) {
for (size_t i = 0; i < len; i++) {
swapBytes32(dst);
dst += sizeof(float);
}
}
}
void THP_encodeDoubleBuffer(uint8_t* dst, const double* src, THPByteOrder order, size_t len)
{
memcpy(dst, src, sizeof(double) * len);
if (order != THP_nativeByteOrder()) {
for (size_t i = 0; i < len; i++) {
swapBytes64(dst);
dst += sizeof(double);
}
}
}
template <typename T>
std::vector<T> complex_to_float(const c10::complex<T>* src, size_t len) {
std::vector<T> new_src;
new_src.reserve(2 * len);
for (size_t i = 0; i < len; i++) {
auto elem = src[i];
new_src.emplace_back(elem.real());
new_src.emplace_back(elem.imag());
}
return new_src;
}
void THP_encodeComplexFloatBuffer(uint8_t* dst, const c10::complex<float>* src, THPByteOrder order, size_t len)
{
auto new_src = complex_to_float(src, len);
memcpy(dst, static_cast<void*>(&new_src), 2 * sizeof(float) * len);
if (order != THP_nativeByteOrder()) {
for (size_t i = 0; i < (2 * len); i++) {
swapBytes32(dst);
dst += sizeof(float);
}
}
}
void THP_encodeCompelxDoubleBuffer(uint8_t* dst, const c10::complex<double>* src, THPByteOrder order, size_t len)
{
auto new_src = complex_to_float(src, len);
memcpy(dst, static_cast<void*>(&new_src), 2 * sizeof(double) * len);
if (order != THP_nativeByteOrder()) {
for (size_t i = 0; i < (2 * len); i++) {
swapBytes64(dst);
dst += sizeof(double);
}
}
}
} // namespace utils
} // namespace torch
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