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113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
/*
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* By downloading, copying, installing or using the software you agree to this license.
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* If you do not agree to this license, do not download, install,
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* copy or use the software.
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*
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*
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* License Agreement
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* For Open Source Computer Vision Library
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* (3-clause BSD License)
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*
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* Copyright (C) 2014, NVIDIA Corporation, all rights reserved.
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* Third party copyrights are property of their respective owners.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the names of the copyright holders nor the names of the contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* This software is provided by the copyright holders and contributors "as is" and
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* any express or implied warranties, including, but not limited to, the implied
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* warranties of merchantability and fitness for a particular purpose are disclaimed.
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* In no event shall copyright holders or contributors be liable for any direct,
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* indirect, incidental, special, exemplary, or consequential damages
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* (including, but not limited to, procurement of substitute goods or services;
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* loss of use, data, or profits; or business interruption) however caused
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* and on any theory of liability, whether in contract, strict liability,
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* or tort (including negligence or otherwise) arising in any way out of
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* the use of this software, even if advised of the possibility of such damage.
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*/
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#ifndef CAROTENE_INTRINSICS_HPP
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#define CAROTENE_INTRINSICS_HPP
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#include <carotene/definitions.hpp>
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#include <arm_neon.h>
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namespace CAROTENE_NS { namespace internal {
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/////////////// Custom NEON intrinsics ///////////////////
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// calculate reciprocal value
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inline float32x4_t vrecpq_f32(float32x4_t val)
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{
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float32x4_t reciprocal = vrecpeq_f32(val);
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reciprocal = vmulq_f32(vrecpsq_f32(val, reciprocal), reciprocal);
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reciprocal = vmulq_f32(vrecpsq_f32(val, reciprocal), reciprocal);
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return reciprocal;
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}
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inline float32x2_t vrecp_f32(float32x2_t val)
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{
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float32x2_t reciprocal = vrecpe_f32(val);
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reciprocal = vmul_f32(vrecps_f32(val, reciprocal), reciprocal);
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reciprocal = vmul_f32(vrecps_f32(val, reciprocal), reciprocal);
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return reciprocal;
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}
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// caclulate sqrt value
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inline float32x4_t vrsqrtq_f32(float32x4_t val)
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{
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float32x4_t e = vrsqrteq_f32(val);
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e = vmulq_f32(vrsqrtsq_f32(vmulq_f32(e, e), val), e);
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e = vmulq_f32(vrsqrtsq_f32(vmulq_f32(e, e), val), e);
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return e;
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}
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inline float32x2_t vrsqrt_f32(float32x2_t val)
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{
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float32x2_t e = vrsqrte_f32(val);
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e = vmul_f32(vrsqrts_f32(vmul_f32(e, e), val), e);
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e = vmul_f32(vrsqrts_f32(vmul_f32(e, e), val), e);
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return e;
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}
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inline float32x4_t vsqrtq_f32(float32x4_t val)
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{
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return vrecpq_f32(vrsqrtq_f32(val));
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}
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inline float32x2_t vsqrt_f32(float32x2_t val)
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{
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return vrecp_f32(vrsqrt_f32(val));
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}
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// table lookup with the table in a 128-bit register
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inline uint8x8_t vqtbl1_u8 (uint8x16_t a, uint8x8_t b)
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{
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#ifdef __aarch64__
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// AArch64 supports this natively
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return ::vqtbl1_u8(a, b);
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#else
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union { uint8x16_t v; uint8x8x2_t w; } u = { a };
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return vtbl2_u8(u.w, b);
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#endif
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}
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} }
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#endif
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