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39 * Declares `real` and related constants.
42 * \ingroup module_utility
44 #ifndef GMX_UTILITY_REAL_H
45 #define GMX_UTILITY_REAL_H
47 /*! \brief Double precision accuracy */
48 #define GMX_DOUBLE_EPS 2.2204460492503131e-16
50 /*! \brief Maximum double precision value - reduced 1 unit in last digit for MSVC */
51 #define GMX_DOUBLE_MAX 1.7976931348623157e+308
53 /*! \brief Minimum double precision value */
54 #define GMX_DOUBLE_MIN 2.2250738585072014e-308
56 /*! \brief Single precision accuracy */
57 #define GMX_FLOAT_EPS 1.19209290e-07F
59 /*! \brief Maximum single precision value - reduced 1 unit in last digit for MSVC */
60 #define GMX_FLOAT_MAX 3.40282346E+38F
62 /*! \brief Minimum single precision value */
63 #define GMX_FLOAT_MIN 1.175494351E-38F
67 * \brief Precision-dependent \Gromacs floating-point type.
70 * \brief Used to check whether `real` is already defined.
73 * \brief MPI data type for `real`.
76 * \brief Accuracy for `real`.
79 * \brief Smallest non-zero value for `real`.
82 * \brief Largest finite value for `real`.
84 /*! \def gmx_real_fullprecision_pfmt
85 * \brief Format string for full `real` precision.
94 #define GMX_MPI_REAL MPI_DOUBLE
95 #define GMX_REAL_EPS GMX_DOUBLE_EPS
96 #define GMX_REAL_MIN GMX_DOUBLE_MIN
97 #define GMX_REAL_MAX GMX_DOUBLE_MAX
98 #define gmx_real_fullprecision_pfmt "%21.14e"
100 #else /* GMX_DOUBLE */
107 #define GMX_MPI_REAL MPI_FLOAT
108 #define GMX_REAL_EPS GMX_FLOAT_EPS
109 #define GMX_REAL_MIN GMX_FLOAT_MIN
110 #define GMX_REAL_MAX GMX_FLOAT_MAX
111 #define gmx_real_fullprecision_pfmt "%14.7e"
113 #endif /* GMX_DOUBLE */