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ConversionOperators.cuh
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the CC-by-NC license found in the
* LICENSE file in the root directory of this source tree.
*/
// Copyright 2004-present Facebook. All Rights Reserved.
#pragma once
#include <cuda.h>
#include "Float16.cuh"
namespace faiss { namespace gpu {
//
// Conversion utilities
//
template <typename T>
struct ConvertTo {
};
template <>
struct ConvertTo<float> {
static inline __device__ float to(float v) { return v; }
#ifdef FAISS_USE_FLOAT16
static inline __device__ float to(half v) { return __half2float(v); }
#endif
};
template <>
struct ConvertTo<float2> {
static inline __device__ float2 to(float2 v) { return v; }
#ifdef FAISS_USE_FLOAT16
static inline __device__ float2 to(half2 v) { return __half22float2(v); }
#endif
};
template <>
struct ConvertTo<float4> {
static inline __device__ float4 to(float4 v) { return v; }
#ifdef FAISS_USE_FLOAT16
static inline __device__ float4 to(Half4 v) { return half4ToFloat4(v); }
#endif
};
#ifdef FAISS_USE_FLOAT16
template <>
struct ConvertTo<half> {
static inline __device__ half to(float v) { return __float2half(v); }
static inline __device__ half to(half v) { return v; }
};
template <>
struct ConvertTo<half2> {
static inline __device__ half2 to(float2 v) { return __float22half2_rn(v); }
static inline __device__ half2 to(half2 v) { return v; }
};
template <>
struct ConvertTo<Half4> {
static inline __device__ Half4 to(float4 v) { return float4ToHalf4(v); }
static inline __device__ Half4 to(Half4 v) { return v; }
};
#endif
} } // namespace
faiss::gpu::ConvertTo
Definition: ConversionOperators.cuh:23