[444] | 1 | /* Configuration for math routines. |
---|
| 2 | Copyright (c) 2017 ARM Ltd. All rights reserved. |
---|
| 3 | |
---|
| 4 | Redistribution and use in source and binary forms, with or without |
---|
| 5 | modification, are permitted provided that the following conditions |
---|
| 6 | are met: |
---|
| 7 | 1. Redistributions of source code must retain the above copyright |
---|
| 8 | notice, this list of conditions and the following disclaimer. |
---|
| 9 | 2. Redistributions in binary form must reproduce the above copyright |
---|
| 10 | notice, this list of conditions and the following disclaimer in the |
---|
| 11 | documentation and/or other materials provided with the distribution. |
---|
| 12 | 3. The name of the company may not be used to endorse or promote |
---|
| 13 | products derived from this software without specific prior written |
---|
| 14 | permission. |
---|
| 15 | |
---|
| 16 | THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS AND ANY EXPRESS OR IMPLIED |
---|
| 17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
---|
| 18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
---|
| 19 | IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
---|
| 20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
---|
| 21 | TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
---|
| 22 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
---|
| 23 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
---|
| 24 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
---|
| 25 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
---|
| 26 | |
---|
| 27 | #ifndef _MATH_CONFIG_H |
---|
| 28 | #define _MATH_CONFIG_H |
---|
| 29 | |
---|
| 30 | #include <math.h> |
---|
| 31 | #include <stdint.h> |
---|
| 32 | |
---|
| 33 | #ifndef WANT_ROUNDING |
---|
| 34 | /* Correct special case results in non-nearest rounding modes. */ |
---|
| 35 | # define WANT_ROUNDING 1 |
---|
| 36 | #endif |
---|
| 37 | #ifndef WANT_ERRNO |
---|
| 38 | /* Set errno according to ISO C with (math_errhandling & MATH_ERRNO) != 0. */ |
---|
| 39 | # define WANT_ERRNO 1 |
---|
| 40 | #endif |
---|
| 41 | #ifndef WANT_ERRNO_UFLOW |
---|
| 42 | /* Set errno to ERANGE if result underflows to 0 (in all rounding modes). */ |
---|
| 43 | # define WANT_ERRNO_UFLOW (WANT_ROUNDING && WANT_ERRNO) |
---|
| 44 | #endif |
---|
| 45 | |
---|
| 46 | #ifndef TOINT_INTRINSICS |
---|
| 47 | # define TOINT_INTRINSICS 0 |
---|
| 48 | #endif |
---|
| 49 | #ifndef TOINT_RINT |
---|
| 50 | # define TOINT_RINT 0 |
---|
| 51 | #endif |
---|
| 52 | #ifndef TOINT_SHIFT |
---|
| 53 | # define TOINT_SHIFT 1 |
---|
| 54 | #endif |
---|
| 55 | |
---|
| 56 | static inline uint32_t |
---|
| 57 | asuint (float f) |
---|
| 58 | { |
---|
| 59 | union |
---|
| 60 | { |
---|
| 61 | float f; |
---|
| 62 | uint32_t i; |
---|
| 63 | } u = {f}; |
---|
| 64 | return u.i; |
---|
| 65 | } |
---|
| 66 | |
---|
| 67 | static inline float |
---|
| 68 | asfloat (uint32_t i) |
---|
| 69 | { |
---|
| 70 | union |
---|
| 71 | { |
---|
| 72 | uint32_t i; |
---|
| 73 | float f; |
---|
| 74 | } u = {i}; |
---|
| 75 | return u.f; |
---|
| 76 | } |
---|
| 77 | |
---|
| 78 | static inline uint64_t |
---|
| 79 | asuint64 (double f) |
---|
| 80 | { |
---|
| 81 | union |
---|
| 82 | { |
---|
| 83 | double f; |
---|
| 84 | uint64_t i; |
---|
| 85 | } u = {f}; |
---|
| 86 | return u.i; |
---|
| 87 | } |
---|
| 88 | |
---|
| 89 | static inline double |
---|
| 90 | asdouble (uint64_t i) |
---|
| 91 | { |
---|
| 92 | union |
---|
| 93 | { |
---|
| 94 | uint64_t i; |
---|
| 95 | double f; |
---|
| 96 | } u = {i}; |
---|
| 97 | return u.f; |
---|
| 98 | } |
---|
| 99 | |
---|
| 100 | #ifndef IEEE_754_2008_SNAN |
---|
| 101 | # define IEEE_754_2008_SNAN 1 |
---|
| 102 | #endif |
---|
| 103 | static inline int |
---|
| 104 | issignalingf_inline (float x) |
---|
| 105 | { |
---|
| 106 | uint32_t ix = asuint (x); |
---|
| 107 | if (!IEEE_754_2008_SNAN) |
---|
| 108 | return (ix & 0x7fc00000) == 0x7fc00000; |
---|
| 109 | return 2 * (ix ^ 0x00400000) > 2u * 0x7fc00000; |
---|
| 110 | } |
---|
| 111 | |
---|
| 112 | #ifdef __GNUC__ |
---|
| 113 | # define HIDDEN __attribute__ ((__visibility__ ("hidden"))) |
---|
| 114 | # define NOINLINE __attribute__ ((noinline)) |
---|
| 115 | #else |
---|
| 116 | # define HIDDEN |
---|
| 117 | # define NOINLINE |
---|
| 118 | #endif |
---|
| 119 | |
---|
| 120 | HIDDEN float __math_oflowf (unsigned long); |
---|
| 121 | HIDDEN float __math_uflowf (unsigned long); |
---|
| 122 | HIDDEN float __math_may_uflowf (unsigned long); |
---|
| 123 | HIDDEN float __math_divzerof (unsigned long); |
---|
| 124 | HIDDEN float __math_invalidf (float); |
---|
| 125 | |
---|
| 126 | /* Shared between expf, exp2f and powf. */ |
---|
| 127 | #define EXP2F_TABLE_BITS 5 |
---|
| 128 | #define EXP2F_POLY_ORDER 3 |
---|
| 129 | extern const struct exp2f_data |
---|
| 130 | { |
---|
| 131 | uint64_t tab[1 << EXP2F_TABLE_BITS]; |
---|
| 132 | double shift_scaled; |
---|
| 133 | double poly[EXP2F_POLY_ORDER]; |
---|
| 134 | double shift; |
---|
| 135 | double invln2_scaled; |
---|
| 136 | double poly_scaled[EXP2F_POLY_ORDER]; |
---|
| 137 | } __exp2f_data HIDDEN; |
---|
| 138 | |
---|
| 139 | #define LOGF_TABLE_BITS 4 |
---|
| 140 | #define LOGF_POLY_ORDER 4 |
---|
| 141 | extern const struct logf_data |
---|
| 142 | { |
---|
| 143 | struct |
---|
| 144 | { |
---|
| 145 | double invc, logc; |
---|
| 146 | } tab[1 << LOGF_TABLE_BITS]; |
---|
| 147 | double ln2; |
---|
| 148 | double poly[LOGF_POLY_ORDER - 1]; /* First order coefficient is 1. */ |
---|
| 149 | } __logf_data HIDDEN; |
---|
| 150 | |
---|
| 151 | #define LOG2F_TABLE_BITS 4 |
---|
| 152 | #define LOG2F_POLY_ORDER 4 |
---|
| 153 | extern const struct log2f_data |
---|
| 154 | { |
---|
| 155 | struct |
---|
| 156 | { |
---|
| 157 | double invc, logc; |
---|
| 158 | } tab[1 << LOG2F_TABLE_BITS]; |
---|
| 159 | double poly[LOG2F_POLY_ORDER]; |
---|
| 160 | } __log2f_data HIDDEN; |
---|
| 161 | |
---|
| 162 | #define POWF_LOG2_TABLE_BITS 4 |
---|
| 163 | #define POWF_LOG2_POLY_ORDER 5 |
---|
| 164 | #if TOINT_INTRINSICS |
---|
| 165 | # define POWF_SCALE_BITS EXP2F_TABLE_BITS |
---|
| 166 | #else |
---|
| 167 | # define POWF_SCALE_BITS 0 |
---|
| 168 | #endif |
---|
| 169 | #define POWF_SCALE ((double) (1 << POWF_SCALE_BITS)) |
---|
| 170 | extern const struct powf_log2_data |
---|
| 171 | { |
---|
| 172 | struct |
---|
| 173 | { |
---|
| 174 | double invc, logc; |
---|
| 175 | } tab[1 << POWF_LOG2_TABLE_BITS]; |
---|
| 176 | double poly[POWF_LOG2_POLY_ORDER]; |
---|
| 177 | } __powf_log2_data HIDDEN; |
---|
| 178 | |
---|
| 179 | #endif |
---|