121 lines
3.2 KiB
Plaintext
121 lines
3.2 KiB
Plaintext
/**
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
|
|
|
|
#pragma once
|
|
|
|
#include <cuda.h>
|
|
#include "DeviceDefs.cuh"
|
|
#include "Float16.cuh"
|
|
|
|
namespace faiss { namespace gpu {
|
|
|
|
template <typename T>
|
|
inline __device__ T shfl(const T val,
|
|
int srcLane, int width = kWarpSize) {
|
|
#if CUDA_VERSION >= 9000
|
|
return __shfl_sync(0xffffffff, val, srcLane, width);
|
|
#else
|
|
return __shfl(val, srcLane, width);
|
|
#endif
|
|
}
|
|
|
|
// CUDA SDK does not provide specializations for T*
|
|
template <typename T>
|
|
inline __device__ T* shfl(T* const val,
|
|
int srcLane, int width = kWarpSize) {
|
|
static_assert(sizeof(T*) == sizeof(long long), "pointer size");
|
|
long long v = (long long) val;
|
|
|
|
return (T*) shfl(v, srcLane, width);
|
|
}
|
|
|
|
template <typename T>
|
|
inline __device__ T shfl_up(const T val,
|
|
unsigned int delta, int width = kWarpSize) {
|
|
#if CUDA_VERSION >= 9000
|
|
return __shfl_up_sync(0xffffffff, val, delta, width);
|
|
#else
|
|
return __shfl_up(val, delta, width);
|
|
#endif
|
|
}
|
|
|
|
// CUDA SDK does not provide specializations for T*
|
|
template <typename T>
|
|
inline __device__ T* shfl_up(T* const val,
|
|
unsigned int delta, int width = kWarpSize) {
|
|
static_assert(sizeof(T*) == sizeof(long long), "pointer size");
|
|
long long v = (long long) val;
|
|
|
|
return (T*) shfl_up(v, delta, width);
|
|
}
|
|
|
|
template <typename T>
|
|
inline __device__ T shfl_down(const T val,
|
|
unsigned int delta, int width = kWarpSize) {
|
|
#if CUDA_VERSION >= 9000
|
|
return __shfl_down_sync(0xffffffff, val, delta, width);
|
|
#else
|
|
return __shfl_down(val, delta, width);
|
|
#endif
|
|
}
|
|
|
|
// CUDA SDK does not provide specializations for T*
|
|
template <typename T>
|
|
inline __device__ T* shfl_down(T* const val,
|
|
unsigned int delta, int width = kWarpSize) {
|
|
static_assert(sizeof(T*) == sizeof(long long), "pointer size");
|
|
long long v = (long long) val;
|
|
return (T*) shfl_down(v, delta, width);
|
|
}
|
|
|
|
template <typename T>
|
|
inline __device__ T shfl_xor(const T val,
|
|
int laneMask, int width = kWarpSize) {
|
|
#if CUDA_VERSION >= 9000
|
|
return __shfl_xor_sync(0xffffffff, val, laneMask, width);
|
|
#else
|
|
return __shfl_xor(val, laneMask, width);
|
|
#endif
|
|
}
|
|
|
|
// CUDA SDK does not provide specializations for T*
|
|
template <typename T>
|
|
inline __device__ T* shfl_xor(T* const val,
|
|
int laneMask, int width = kWarpSize) {
|
|
static_assert(sizeof(T*) == sizeof(long long), "pointer size");
|
|
long long v = (long long) val;
|
|
return (T*) shfl_xor(v, laneMask, width);
|
|
}
|
|
|
|
#ifdef FAISS_USE_FLOAT16
|
|
// CUDA 9.0 has half shuffle
|
|
#if CUDA_VERSION < 9000
|
|
inline __device__ half shfl(half v,
|
|
int srcLane, int width = kWarpSize) {
|
|
unsigned int vu = v.x;
|
|
vu = __shfl(vu, srcLane, width);
|
|
|
|
half h;
|
|
h.x = (unsigned short) vu;
|
|
return h;
|
|
}
|
|
|
|
inline __device__ half shfl_xor(half v,
|
|
int laneMask, int width = kWarpSize) {
|
|
unsigned int vu = v.x;
|
|
vu = __shfl_xor(vu, laneMask, width);
|
|
|
|
half h;
|
|
h.x = (unsigned short) vu;
|
|
return h;
|
|
}
|
|
#endif // CUDA_VERSION
|
|
#endif // FAISS_USE_FLOAT16
|
|
|
|
} } // namespace
|