77 lines
1.7 KiB
Plaintext
77 lines
1.7 KiB
Plaintext
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <cuda.h>
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#include "../../Index.h"
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#include "Float16.cuh"
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namespace faiss { namespace gpu {
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//
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// Conversion utilities
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//
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struct IntToIdxType {
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inline __device__ faiss::Index::idx_t operator()(int v) const {
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return (faiss::Index::idx_t) v;
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}
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};
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template <typename T>
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struct ConvertTo {
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};
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template <>
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struct ConvertTo<float> {
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static inline __device__ float to(float v) { return v; }
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#ifdef FAISS_USE_FLOAT16
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static inline __device__ float to(half v) { return __half2float(v); }
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#endif
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};
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template <>
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struct ConvertTo<float2> {
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static inline __device__ float2 to(float2 v) { return v; }
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#ifdef FAISS_USE_FLOAT16
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static inline __device__ float2 to(half2 v) { return __half22float2(v); }
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#endif
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};
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template <>
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struct ConvertTo<float4> {
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static inline __device__ float4 to(float4 v) { return v; }
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#ifdef FAISS_USE_FLOAT16
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static inline __device__ float4 to(Half4 v) { return half4ToFloat4(v); }
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#endif
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};
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#ifdef FAISS_USE_FLOAT16
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template <>
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struct ConvertTo<half> {
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static inline __device__ half to(float v) { return __float2half(v); }
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static inline __device__ half to(half v) { return v; }
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};
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template <>
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struct ConvertTo<half2> {
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static inline __device__ half2 to(float2 v) { return __float22half2_rn(v); }
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static inline __device__ half2 to(half2 v) { return v; }
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};
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template <>
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struct ConvertTo<Half4> {
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static inline __device__ Half4 to(float4 v) { return float4ToHalf4(v); }
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static inline __device__ Half4 to(Half4 v) { return v; }
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};
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#endif
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} } // namespace
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