1/* Helper macros for type generic function implementations within libm.
2 Copyright (C) 2016-2021 Free Software Foundation, Inc.
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 <https://www.gnu.org/licenses/>. */
18
19#ifndef _MATH_TYPE_MACROS
20#define _MATH_TYPE_MACROS
21
22/* Each type imports a header which is expected to
23 define:
24
25 M_LIT(x) - Paste the type specific suffix onto the constant x.
26 M_MLIT(x) - Paste the type specific suffix used by the macro
27 constants in math.h, i.e M_PI or M_PIl.
28 M_PFX - The prefixed used by float.h macros like FLT_MANT_DIG.
29 M_SUF(x) - Paste the the type specific suffix used by functions
30 i.e expf expl exp.
31 FLOAT - Resolves to the C typename of M_TYPE.
32 CFLOAT - Resolves to the complex typename of M_TYPE.
33 M_STRTO_NAN - Resolves to the internal libc function which
34 converts a string into the appropriate FLOAT nan
35 value.
36
37 declare_mgen_alias(from,to)
38 This exposes the appropriate symbol(s) for a
39 function f of type FLOAT.
40
41 declare_mgen_alias_r(from,to)
42 This exposes the appropriate symbol(s) for a
43 function f_r of type FLOAT.
44
45 SET_NAN_PAYLOAD(flt, mant)
46 Set the NaN payload bits of the variable FLT of type FLOAT to
47 the mantissa MANT. */
48
49#ifndef M_PFX
50# error "M_PFX must be defined."
51#endif
52#ifndef M_LIT
53# error "M_LIT must be defined."
54#endif
55#ifndef M_MLIT
56# error "M_MLIT must be defined."
57#endif
58#ifndef M_SUF
59# error "M_SUF must be defined."
60#endif
61#ifndef FLOAT
62# error "FLOAT must be defined."
63#endif
64#ifndef CFLOAT
65# error "CFLOAT must be defined."
66#endif
67#ifndef declare_mgen_alias
68# error "declare_mgen_alias must be defined."
69#endif
70#ifndef declare_mgen_alias_r
71# error "declare_mgen_alias_r must be defined."
72#endif
73#ifndef SET_NAN_PAYLOAD
74# error "SET_NAN_PAYLOAD must be defined."
75#endif
76
77#ifndef declare_mgen_finite_alias_x
78#define declare_mgen_finite_alias_x(from, to) \
79 libm_alias_finite (from, to)
80#endif
81
82#ifndef declare_mgen_finite_alias_s
83# define declare_mgen_finite_alias_s(from,to) \
84 declare_mgen_finite_alias_x (from, to)
85#endif
86
87#ifndef declare_mgen_finite_alias
88# define declare_mgen_finite_alias(from, to) \
89 declare_mgen_finite_alias_s (M_SUF (from), M_SUF (to))
90#endif
91
92#define __M_CONCAT(a,b) a ## b
93#define __M_CONCATX(a,b) __M_CONCAT(a,b)
94
95#define M_NAN M_SUF (__builtin_nan) ("")
96#define M_MIN_EXP __M_CONCATX (M_PFX, _MIN_EXP)
97#define M_MAX_EXP __M_CONCATX (M_PFX, _MAX_EXP)
98#define M_MIN __M_CONCATX (M_PFX, _MIN)
99#define M_MAX __M_CONCATX (M_PFX, _MAX)
100#define M_MANT_DIG __M_CONCATX (M_PFX, _MANT_DIG)
101#define M_HUGE_VAL (M_SUF (__builtin_huge_val) ())
102
103/* Helper macros for commonly used functions. */
104#define M_COPYSIGN M_SUF (copysign)
105#define M_FABS M_SUF (fabs)
106#define M_SINCOS M_SUF (__sincos)
107#define M_SCALBN M_SUF (__scalbn)
108#define M_LOG1P M_SUF (__log1p)
109
110#define M_ATAN2 M_SUF (__ieee754_atan2)
111#define M_COSH M_SUF (__ieee754_cosh)
112#define M_EXP M_SUF (__ieee754_exp)
113#define M_HYPOT M_SUF (__ieee754_hypot)
114#define M_LOG M_SUF (__ieee754_log)
115#define M_SINH M_SUF (__ieee754_sinh)
116#define M_SQRT M_SUF (sqrt)
117
118/* Needed to evaluate M_MANT_DIG below. */
119#include <float.h>
120#include <libm-alias-finite.h>
121
122/* Use a special epsilon value for IBM long double
123 to avoid spurious overflows/underflows. */
124#if M_MANT_DIG != 106
125# define M_EPSILON __M_CONCATX (M_PFX, _EPSILON)
126#else
127# define M_EPSILON M_LIT (0x1p-106)
128#endif
129
130/* Enable overloading of function name to assist reuse. */
131#ifndef M_DECL_FUNC
132# define M_DECL_FUNC(f) M_SUF (f)
133#endif
134
135#endif /* _MATH_TYPE_MACROS */
136