1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 /******************************************************************************* * This file is part of SWIFT. * Copyright (c) 2016 Matthieu Schaller (matthieu.schaller@durham.ac.uk). * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see . * ******************************************************************************/  Matthieu Schaller committed Jul 13, 2016 19 20 #ifndef SWIFT_ADIABATIC_INDEX_H #define SWIFT_ADIABATIC_INDEX_H  21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106  /* Config parameters. */ #include "../config.h" /* Some standard headers. */ #include /* Local headers. */ #include "const.h" #include "debug.h" #include "inline.h" /* First define some constants */ #if defined(HYDRO_GAMMA_5_3) #define hydro_gamma 1.66666666666666667f #define hydro_gamma_minus_one 0.66666666666666667f #elif defined(HYDRO_GAMMA_4_3) #define hydro_gamma 1.33333333333333333f #define hydro_gamma_minus_one 0.33333333333333333f #elif defined(HYDRO_GAMMA_2_1) #define hydro_gamma 2.f #define hydro_gamma_minus_one 1.f #endif /** * @brief Returns the argument to the power given by the adiabatic index * * Computes $x^\gamma$. */ __attribute__((always_inline)) INLINE static float pow_gamma(float x) { #if defined(HYDRO_GAMMA_5_3) const float x2 = x * x; const float x5 = x2 * x2 * x; return cbrtf(x5); #elif defined(HYDRO_GAMMA_4_3) const float x2 = x * x; const float x4 = x2 * x2; return cbrtf(x4); #elif defined(HYDRO_GAMMA_2_1) return x * x; #else error("The adiabatic index is not defined !"); return 0.f; #endif } /** * @brief Returns one over the argument to the power given by the adiabatic * index minus one * * Computes $x^{-(\gamma - 1)}$. */ __attribute__((always_inline)) INLINE static float pow_minus_gamma_minus_one( float x) { #if defined(HYDRO_GAMMA_5_3) return 1.f / cbrtf(x * x); #elif defined(HYDRO_GAMMA_4_3) return 1.f / cbrtf(x); #elif defined(HYDRO_GAMMA_2_1) return 1.f / x; #else error("The adiabatic index is not defined !"); return 0.f; #endif }  Matthieu Schaller committed Jul 13, 2016 107 #endif /* SWIFT_ADIABATIC_INDEX_H */