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#ifndef THC_ATOMICS_INC
#define THC_ATOMICS_INC
#include "THCHalf.h"
#include "THCNumerics.cuh"
template <typename T, size_t n>
struct AtomicAddIntegerImpl;
template<typename T>
struct AtomicAddIntegerImpl<T, 1> {
inline __device__ void operator()(T *address, T val) {
unsigned int * address_as_ui =
(unsigned int *) (address - ((size_t)address & 3));
unsigned int old = *address_as_ui;
unsigned int shift = (((size_t)address & 3) * 8);
unsigned int sum;
unsigned int assumed;
do {
assumed = old;
sum = val + T((old >> shift) & 0xff);
old = (old & ~(0x000000ff << shift)) | (sum << shift);
old = atomicCAS(address_as_ui, assumed, old);
} while (assumed != old);
}
};
template<typename T>
struct AtomicAddIntegerImpl<T, 2> {
inline __device__ void operator()(T *address, T val) {
unsigned int * address_as_ui =
(unsigned int *) ((char *)address - ((size_t)address & 2));
unsigned int old = *address_as_ui;
unsigned int sum;
unsigned int newval;
unsigned int assumed;
do {
assumed = old;
sum = val + (size_t)address & 2 ? T(old >> 16) : T(old & 0xffff);
newval = (size_t)address & 2 ? (old & 0xffff) | (sum << 16) : (old & 0xffff0000) | sum;
old = atomicCAS(address_as_ui, assumed, newval);
} while (assumed != old);
}
};
template<typename T>
struct AtomicAddIntegerImpl<T, 4> {
inline __device__ void operator()(T *address, T val) {
unsigned int * address_as_ui = (unsigned int *) (address);
unsigned int old = *address_as_ui;
unsigned int newval;
unsigned int assumed;
do {
assumed = old;
newval = val + (T)old;
old = atomicCAS(address_as_ui, assumed, newval);
} while (assumed != old);
}
};
template<typename T>
struct AtomicAddIntegerImpl<T, 8> {
inline __device__ void operator()(T *address, T val) {
unsigned long long * address_as_ui = (unsigned long long *) (address);
unsigned long long old = *address_as_ui;
unsigned long long newval;
unsigned long long assumed;
do {
assumed = old;
newval = val + (T)old;
old = atomicCAS(address_as_ui, assumed, newval);
} while (assumed != old);
}
};
static inline __device__ void atomicAdd(unsigned char *address, unsigned char val) {
AtomicAddIntegerImpl<unsigned char, sizeof(unsigned char)>()(address, val);
}
static inline __device__ void atomicAdd(char *address, char val) {
AtomicAddIntegerImpl<char, sizeof(char)>()(address, val);
}
static inline __device__ void atomicAdd(short *address, short val) {
AtomicAddIntegerImpl<short, sizeof(short)>()(address, val);
}
static inline __device__ void atomicAdd(long *address, long val) {
AtomicAddIntegerImpl<long, sizeof(long)>()(address, val);
}
#ifdef CUDA_HALF_TENSOR
static inline __device__ void atomicAdd(half *address, half val) {
unsigned int * address_as_ui =
(unsigned int *) ((char *)address - ((size_t)address & 2));
unsigned int old = *address_as_ui;
unsigned int assumed;
do {
assumed = old;
#if CUDA_VERSION < 9000
half hsum;
hsum.x = (size_t)address & 2 ? (old >> 16) : (old & 0xffff);
hsum = THCNumerics<half>::add(hsum, val);
#else
__half_raw hsum;
hsum.x = (size_t)address & 2 ? (old >> 16) : (old & 0xffff);
half tmpres = THCNumerics<half>::add(hsum, val);
hsum = __half_raw(tmpres);
#endif
old = (size_t)address & 2 ? (old & 0xffff) | (hsum.x << 16) : (old & 0xffff0000) | hsum.x;
old = atomicCAS(address_as_ui, assumed, old);
} while (assumed != old);
}
#endif
#if defined(__CUDA_ARCH__) && (__CUDA_ARCH__ < 600 || CUDA_VERSION < 8000)
// from CUDA C Programmic Guide
static inline __device__ void atomicAdd(double *address, double val) {
unsigned long long int* address_as_ull = (unsigned long long int*)address;
unsigned long long int old = *address_as_ull;
unsigned long long int assumed;
do {
assumed = old;
old = atomicCAS(address_as_ull, assumed,
__double_as_longlong(val +
__longlong_as_double(assumed)));
// Note: uses integer comparison to avoid hang in case of NaN (since NaN != NaN)
} while (assumed != old);
}
#elif !defined(__CUDA_ARCH__) && (CUDA_VERSION < 8000)
// This needs to be defined for the host side pass
static inline __device__ void atomicAdd(double *address, double val) { }
#endif
#endif // THC_ATOMICS_INC
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