| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 Intel Corporation |
| ** |
| ** Permission is hereby granted, free of charge, to any person obtaining a copy |
| ** of this software and associated documentation files (the "Software"), to deal |
| ** in the Software without restriction, including without limitation the rights |
| ** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| ** copies of the Software, and to permit persons to whom the Software is |
| ** furnished to do so, subject to the following conditions: |
| ** |
| ** The above copyright notice and this permission notice shall be included in |
| ** all copies or substantial portions of the Software. |
| ** |
| ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| ** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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| ** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| ** THE SOFTWARE. |
| ** |
| ****************************************************************************/ |
| |
| #ifndef MATH_SUPPORT_H |
| #define MATH_SUPPORT_H |
| |
| #include <math.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* this function was copied & adapted from RFC 7049 Appendix D */ |
| static inline double decode_half(unsigned short half) |
| { |
| #ifdef __F16C__ |
| return _cvtsh_ss(half); |
| #else |
| int exp = (half >> 10) & 0x1f; |
| int mant = half & 0x3ff; |
| double val; |
| if (exp == 0) val = ldexp(mant, -24); |
| else if (exp != 31) val = ldexp(mant + 1024, exp - 25); |
| else val = mant == 0 ? INFINITY : NAN; |
| return half & 0x8000 ? -val : val; |
| #endif |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif // MATH_SUPPORT_H |
| |