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72aa6233 | 1 | /* Configuration for math routines. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
72aa6233 SN |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef _MATH_CONFIG_H | |
20 | #define _MATH_CONFIG_H | |
21 | ||
22 | #include <math.h> | |
23 | #include <math_private.h> | |
4ea49f4c | 24 | #include <nan-high-order-bit.h> |
72aa6233 SN |
25 | #include <stdint.h> |
26 | ||
27 | #ifndef WANT_ROUNDING | |
28 | /* Correct special case results in non-nearest rounding modes. */ | |
29 | # define WANT_ROUNDING 1 | |
30 | #endif | |
31 | #ifndef WANT_ERRNO | |
32 | /* Set errno according to ISO C with (math_errhandling & MATH_ERRNO) != 0. */ | |
33 | # define WANT_ERRNO 1 | |
34 | #endif | |
35 | #ifndef WANT_ERRNO_UFLOW | |
36 | /* Set errno to ERANGE if result underflows to 0 (in all rounding modes). */ | |
37 | # define WANT_ERRNO_UFLOW (WANT_ROUNDING && WANT_ERRNO) | |
38 | #endif | |
39 | ||
40 | #ifndef TOINT_INTRINSICS | |
43cfdf8f SN |
41 | /* When set, the roundtoint and converttoint functions are provided with |
42 | the semantics documented below. */ | |
72aa6233 SN |
43 | # define TOINT_INTRINSICS 0 |
44 | #endif | |
43cfdf8f SN |
45 | |
46 | #if TOINT_INTRINSICS | |
47 | /* Round x to nearest int in all rounding modes, ties have to be rounded | |
48 | consistently with converttoint so the results match. If the result | |
49 | would be outside of [-2^31, 2^31-1] then the semantics is unspecified. */ | |
50 | static inline double_t | |
51 | roundtoint (double_t x); | |
52 | ||
53 | /* Convert x to nearest int in all rounding modes, ties have to be rounded | |
54 | consistently with roundtoint. If the result is not representible in an | |
55 | int32_t then the semantics is unspecified. */ | |
56 | static inline int32_t | |
57 | converttoint (double_t x); | |
72aa6233 SN |
58 | #endif |
59 | ||
60 | static inline uint32_t | |
61 | asuint (float f) | |
62 | { | |
63 | union | |
64 | { | |
65 | float f; | |
66 | uint32_t i; | |
67 | } u = {f}; | |
68 | return u.i; | |
69 | } | |
70 | ||
71 | static inline float | |
72 | asfloat (uint32_t i) | |
73 | { | |
74 | union | |
75 | { | |
76 | uint32_t i; | |
77 | float f; | |
78 | } u = {i}; | |
79 | return u.f; | |
80 | } | |
81 | ||
82 | static inline uint64_t | |
83 | asuint64 (double f) | |
84 | { | |
85 | union | |
86 | { | |
87 | double f; | |
88 | uint64_t i; | |
89 | } u = {f}; | |
90 | return u.i; | |
91 | } | |
92 | ||
93 | static inline double | |
94 | asdouble (uint64_t i) | |
95 | { | |
96 | union | |
97 | { | |
98 | uint64_t i; | |
99 | double f; | |
100 | } u = {i}; | |
101 | return u.f; | |
102 | } | |
103 | ||
4ea49f4c SN |
104 | static inline int |
105 | issignalingf_inline (float x) | |
106 | { | |
107 | uint32_t ix = asuint (x); | |
108 | if (HIGH_ORDER_BIT_IS_SET_FOR_SNAN) | |
109 | return (ix & 0x7fc00000) == 0x7fc00000; | |
110 | return 2 * (ix ^ 0x00400000) > 2u * 0x7fc00000; | |
111 | } | |
112 | ||
72aa6233 SN |
113 | #define NOINLINE __attribute__ ((noinline)) |
114 | ||
2b445206 SN |
115 | attribute_hidden float __math_oflowf (uint32_t); |
116 | attribute_hidden float __math_uflowf (uint32_t); | |
117 | attribute_hidden float __math_may_uflowf (uint32_t); | |
118 | attribute_hidden float __math_divzerof (uint32_t); | |
72aa6233 SN |
119 | attribute_hidden float __math_invalidf (float); |
120 | ||
121 | /* Shared between expf, exp2f and powf. */ | |
122 | #define EXP2F_TABLE_BITS 5 | |
123 | #define EXP2F_POLY_ORDER 3 | |
124 | extern const struct exp2f_data | |
125 | { | |
126 | uint64_t tab[1 << EXP2F_TABLE_BITS]; | |
127 | double shift_scaled; | |
128 | double poly[EXP2F_POLY_ORDER]; | |
129 | double shift; | |
130 | double invln2_scaled; | |
131 | double poly_scaled[EXP2F_POLY_ORDER]; | |
132 | } __exp2f_data attribute_hidden; | |
133 | ||
bf27d397 SN |
134 | #define LOGF_TABLE_BITS 4 |
135 | #define LOGF_POLY_ORDER 4 | |
136 | extern const struct logf_data | |
137 | { | |
138 | struct | |
139 | { | |
140 | double invc, logc; | |
141 | } tab[1 << LOGF_TABLE_BITS]; | |
142 | double ln2; | |
143 | double poly[LOGF_POLY_ORDER - 1]; /* First order coefficient is 1. */ | |
144 | } __logf_data attribute_hidden; | |
145 | ||
875c76c7 SN |
146 | #define LOG2F_TABLE_BITS 4 |
147 | #define LOG2F_POLY_ORDER 4 | |
148 | extern const struct log2f_data | |
149 | { | |
150 | struct | |
151 | { | |
152 | double invc, logc; | |
153 | } tab[1 << LOG2F_TABLE_BITS]; | |
154 | double poly[LOG2F_POLY_ORDER]; | |
155 | } __log2f_data attribute_hidden; | |
156 | ||
4ea49f4c SN |
157 | #define POWF_LOG2_TABLE_BITS 4 |
158 | #define POWF_LOG2_POLY_ORDER 5 | |
159 | #if TOINT_INTRINSICS | |
160 | # define POWF_SCALE_BITS EXP2F_TABLE_BITS | |
161 | #else | |
162 | # define POWF_SCALE_BITS 0 | |
163 | #endif | |
164 | #define POWF_SCALE ((double) (1 << POWF_SCALE_BITS)) | |
165 | extern const struct powf_log2_data | |
166 | { | |
167 | struct | |
168 | { | |
169 | double invc, logc; | |
170 | } tab[1 << POWF_LOG2_TABLE_BITS]; | |
171 | double poly[POWF_LOG2_POLY_ORDER]; | |
172 | } __powf_log2_data attribute_hidden; | |
173 | ||
72aa6233 | 174 | #endif |