| /* Configuration for math routines. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library 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 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _MATH_CONFIG_H |
| #define _MATH_CONFIG_H |
| |
| #include <math.h> |
| #include <math_private.h> |
| #include <nan-high-order-bit.h> |
| #include <stdint.h> |
| |
| #ifndef WANT_ROUNDING |
| /* Correct special case results in non-nearest rounding modes. */ |
| # define WANT_ROUNDING 1 |
| #endif |
| #ifndef WANT_ERRNO |
| /* Set errno according to ISO C with (math_errhandling & MATH_ERRNO) != 0. */ |
| # define WANT_ERRNO 1 |
| #endif |
| #ifndef WANT_ERRNO_UFLOW |
| /* Set errno to ERANGE if result underflows to 0 (in all rounding modes). */ |
| # define WANT_ERRNO_UFLOW (WANT_ROUNDING && WANT_ERRNO) |
| #endif |
| |
| #ifndef TOINT_INTRINSICS |
| # define TOINT_INTRINSICS 0 |
| #endif |
| #ifndef TOINT_RINT |
| # define TOINT_RINT 0 |
| #endif |
| #ifndef TOINT_SHIFT |
| # define TOINT_SHIFT 1 |
| #endif |
| |
| static inline uint32_t |
| asuint (float f) |
| { |
| union |
| { |
| float f; |
| uint32_t i; |
| } u = {f}; |
| return u.i; |
| } |
| |
| static inline float |
| asfloat (uint32_t i) |
| { |
| union |
| { |
| uint32_t i; |
| float f; |
| } u = {i}; |
| return u.f; |
| } |
| |
| static inline uint64_t |
| asuint64 (double f) |
| { |
| union |
| { |
| double f; |
| uint64_t i; |
| } u = {f}; |
| return u.i; |
| } |
| |
| static inline double |
| asdouble (uint64_t i) |
| { |
| union |
| { |
| uint64_t i; |
| double f; |
| } u = {i}; |
| return u.f; |
| } |
| |
| static inline int |
| issignalingf_inline (float x) |
| { |
| uint32_t ix = asuint (x); |
| if (HIGH_ORDER_BIT_IS_SET_FOR_SNAN) |
| return (ix & 0x7fc00000) == 0x7fc00000; |
| return 2 * (ix ^ 0x00400000) > 2u * 0x7fc00000; |
| } |
| |
| #define NOINLINE __attribute__ ((noinline)) |
| |
| attribute_hidden float __math_oflowf (unsigned long); |
| attribute_hidden float __math_uflowf (unsigned long); |
| attribute_hidden float __math_may_uflowf (unsigned long); |
| attribute_hidden float __math_divzerof (unsigned long); |
| attribute_hidden float __math_invalidf (float); |
| |
| /* Shared between expf, exp2f and powf. */ |
| #define EXP2F_TABLE_BITS 5 |
| #define EXP2F_POLY_ORDER 3 |
| extern const struct exp2f_data |
| { |
| uint64_t tab[1 << EXP2F_TABLE_BITS]; |
| double shift_scaled; |
| double poly[EXP2F_POLY_ORDER]; |
| double shift; |
| double invln2_scaled; |
| double poly_scaled[EXP2F_POLY_ORDER]; |
| } __exp2f_data attribute_hidden; |
| |
| #define LOGF_TABLE_BITS 4 |
| #define LOGF_POLY_ORDER 4 |
| extern const struct logf_data |
| { |
| struct |
| { |
| double invc, logc; |
| } tab[1 << LOGF_TABLE_BITS]; |
| double ln2; |
| double poly[LOGF_POLY_ORDER - 1]; /* First order coefficient is 1. */ |
| } __logf_data attribute_hidden; |
| |
| #define LOG2F_TABLE_BITS 4 |
| #define LOG2F_POLY_ORDER 4 |
| extern const struct log2f_data |
| { |
| struct |
| { |
| double invc, logc; |
| } tab[1 << LOG2F_TABLE_BITS]; |
| double poly[LOG2F_POLY_ORDER]; |
| } __log2f_data attribute_hidden; |
| |
| #define POWF_LOG2_TABLE_BITS 4 |
| #define POWF_LOG2_POLY_ORDER 5 |
| #if TOINT_INTRINSICS |
| # define POWF_SCALE_BITS EXP2F_TABLE_BITS |
| #else |
| # define POWF_SCALE_BITS 0 |
| #endif |
| #define POWF_SCALE ((double) (1 << POWF_SCALE_BITS)) |
| extern const struct powf_log2_data |
| { |
| struct |
| { |
| double invc, logc; |
| } tab[1 << POWF_LOG2_TABLE_BITS]; |
| double poly[POWF_LOG2_POLY_ORDER]; |
| } __powf_log2_data attribute_hidden; |
| |
| #endif |