119 lines
3.9 KiB
Plaintext
119 lines
3.9 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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// from Nvidia cuDNN library samples; modified to compile within faiss
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#pragma once
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namespace faiss { namespace gpu {
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/*
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* Copyright 1993-2014 NVIDIA Corporation. All rights reserved.
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*
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* NOTICE TO LICENSEE:
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*
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* This source code and/or documentation ("Licensed Deliverables") are
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* subject to NVIDIA intellectual property rights under U.S. and
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* international Copyright laws.
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*
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* These Licensed Deliverables contained herein is PROPRIETARY and
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* CONFIDENTIAL to NVIDIA and is being provided under the terms and
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* conditions of a form of NVIDIA software license agreement by and
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* between NVIDIA and Licensee ("License Agreement") or electronically
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* accepted by Licensee. Notwithstanding any terms or conditions to
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* the contrary in the License Agreement, reproduction or disclosure
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* of the Licensed Deliverables to any third party without the express
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* written consent of NVIDIA is prohibited.
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*
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* NOTWITHSTANDING ANY TERMS OR CONDITIONS TO THE CONTRARY IN THE
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* LICENSE AGREEMENT, NVIDIA MAKES NO REPRESENTATION ABOUT THE
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* SUITABILITY OF THESE LICENSED DELIVERABLES FOR ANY PURPOSE. IT IS
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* PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY OF ANY KIND.
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* NVIDIA DISCLAIMS ALL WARRANTIES WITH REGARD TO THESE LICENSED
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* DELIVERABLES, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
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* NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE.
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* NOTWITHSTANDING ANY TERMS OR CONDITIONS TO THE CONTRARY IN THE
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* LICENSE AGREEMENT, IN NO EVENT SHALL NVIDIA BE LIABLE FOR ANY
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* SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OR ANY
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* DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THESE LICENSED DELIVERABLES.
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*
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* U.S. Government End Users. These Licensed Deliverables are a
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* "commercial item" as that term is defined at 48 C.F.R. 2.101 (OCT
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* 1995), consisting of "commercial computer software" and "commercial
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* computer software documentation" as such terms are used in 48
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* C.F.R. 12.212 (SEPT 1995) and is provided to the U.S. Government
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* only as a commercial end item. Consistent with 48 C.F.R.12.212 and
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* 48 C.F.R. 227.7202-1 through 227.7202-4 (JUNE 1995), all
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* U.S. Government End Users acquire the Licensed Deliverables with
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* only those rights set forth herein.
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*
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* Any use of the Licensed Deliverables in individual and commercial
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* software must include, in the user documentation and internal
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* comments to the code, the above Disclaimer and U.S. Government End
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* Users Notice.
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*/
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// Conversion from/to 16-bit floating point (half-precision).
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#define HLF_EPSILON 4.887581E-04
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typedef struct __align__(2) {
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unsigned short x;
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} half1;
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half1 cpu_float2half_rn(float f);
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float cpu_half2float(half1 h);
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static __inline__ __device__ __host__ half1 habs(half1 h)
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{
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h.x &= 0x7fffU;
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return h;
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}
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static __inline__ __device__ __host__ half1 hneg(half1 h)
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{
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h.x ^= 0x8000U;
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return h;
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}
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static __inline__ __device__ __host__ int ishnan(half1 h)
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{
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// When input is NaN, exponent is all ones and mantissa is non-zero.
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return (h.x & 0x7c00U) == 0x7c00U && (h.x & 0x03ffU) != 0;
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}
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static __inline__ __device__ __host__ int ishinf(half1 h)
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{
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// When input is +/- inf, exponent is all ones and mantissa is zero.
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return (h.x & 0x7c00U) == 0x7c00U && (h.x & 0x03ffU) == 0;
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}
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static __inline__ __device__ __host__ int ishequ(half1 x, half1 y)
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{
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return ishnan(x) == 0 && ishnan(y) == 0 && x.x == y.x;
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}
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static __inline__ __device__ __host__ half1 hzero()
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{
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half1 ret;
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ret.x = 0x0000U;
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return ret;
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}
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static __inline__ __device__ __host__ half1 hone()
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{
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half1 ret;
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ret.x = 0x3c00U;
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return ret;
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}
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} } // namespace
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