Commit | Line | Data |
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698be2d8 | 1 | # isnanl.m4 serial 21 |
5df4cba6 | 2 | dnl Copyright (C) 2007-2020 Free Software Foundation, Inc. |
88b48903 WN |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | AC_DEFUN([gl_FUNC_ISNANL], | |
8 | [ | |
9 | AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
10 | ISNANL_LIBM= | |
11 | gl_HAVE_ISNANL_NO_LIBM | |
12 | if test $gl_cv_func_isnanl_no_libm = no; then | |
13 | gl_HAVE_ISNANL_IN_LIBM | |
14 | if test $gl_cv_func_isnanl_in_libm = yes; then | |
15 | ISNANL_LIBM=-lm | |
16 | fi | |
17 | fi | |
18 | dnl The variable gl_func_isnanl set here is used by isnan.m4. | |
19 | if test $gl_cv_func_isnanl_no_libm = yes \ | |
20 | || test $gl_cv_func_isnanl_in_libm = yes; then | |
21 | save_LIBS="$LIBS" | |
22 | LIBS="$LIBS $ISNANL_LIBM" | |
23 | gl_FUNC_ISNANL_WORKS | |
24 | LIBS="$save_LIBS" | |
25 | case "$gl_cv_func_isnanl_works" in | |
26 | *yes) gl_func_isnanl=yes ;; | |
27 | *) gl_func_isnanl=no; ISNANL_LIBM= ;; | |
28 | esac | |
29 | else | |
30 | gl_func_isnanl=no | |
31 | fi | |
32 | if test $gl_func_isnanl != yes; then | |
33 | HAVE_ISNANL=0 | |
34 | fi | |
35 | AC_SUBST([ISNANL_LIBM]) | |
36 | ]) | |
37 | ||
38 | AC_DEFUN([gl_FUNC_ISNANL_NO_LIBM], | |
39 | [ | |
40 | gl_HAVE_ISNANL_NO_LIBM | |
41 | gl_func_isnanl_no_libm=$gl_cv_func_isnanl_no_libm | |
42 | if test $gl_func_isnanl_no_libm = yes; then | |
43 | gl_FUNC_ISNANL_WORKS | |
44 | case "$gl_cv_func_isnanl_works" in | |
45 | *yes) ;; | |
46 | *) gl_func_isnanl_no_libm=no ;; | |
47 | esac | |
48 | fi | |
49 | if test $gl_func_isnanl_no_libm = yes; then | |
50 | AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1], | |
51 | [Define if the isnan(long double) function is available in libc.]) | |
52 | fi | |
53 | ]) | |
54 | ||
55 | dnl Prerequisites of replacement isnanl definition. It does not need -lm. | |
56 | AC_DEFUN([gl_PREREQ_ISNANL], | |
57 | [ | |
58 | gl_LONG_DOUBLE_EXPONENT_LOCATION | |
59 | AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) | |
60 | ]) | |
61 | ||
62 | dnl Test whether isnanl() can be used without libm. | |
63 | AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM], | |
64 | [ | |
65 | AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm], | |
66 | [gl_cv_func_isnanl_no_libm], | |
67 | [ | |
68 | AC_LINK_IFELSE( | |
69 | [AC_LANG_PROGRAM( | |
70 | [[#include <math.h> | |
698be2d8 CB |
71 | #ifndef __has_builtin |
72 | # define __has_builtin(name) 0 | |
73 | #endif | |
74 | #if __GNUC__ >= 4 && (!defined __clang__ || __has_builtin (__builtin_isnanl)) | |
88b48903 WN |
75 | # undef isnanl |
76 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
77 | #elif defined isnan | |
78 | # undef isnanl | |
79 | # define isnanl(x) isnan ((long double)(x)) | |
80 | #endif | |
81 | long double x;]], | |
82 | [[return isnanl (x);]])], | |
83 | [gl_cv_func_isnanl_no_libm=yes], | |
84 | [gl_cv_func_isnanl_no_libm=no]) | |
85 | ]) | |
86 | ]) | |
87 | ||
88 | dnl Test whether isnanl() can be used with libm. | |
89 | AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM], | |
90 | [ | |
91 | AC_CACHE_CHECK([whether isnan(long double) can be used with libm], | |
92 | [gl_cv_func_isnanl_in_libm], | |
93 | [ | |
94 | save_LIBS="$LIBS" | |
95 | LIBS="$LIBS -lm" | |
96 | AC_LINK_IFELSE( | |
97 | [AC_LANG_PROGRAM( | |
98 | [[#include <math.h> | |
698be2d8 CB |
99 | #ifndef __has_builtin |
100 | # define __has_builtin(name) 0 | |
101 | #endif | |
102 | #if __GNUC__ >= 4 && (!defined __clang__ || __has_builtin (__builtin_isnanl)) | |
88b48903 WN |
103 | # undef isnanl |
104 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
105 | #elif defined isnan | |
106 | # undef isnanl | |
107 | # define isnanl(x) isnan ((long double)(x)) | |
108 | #endif | |
109 | long double x;]], | |
110 | [[return isnanl (x);]])], | |
111 | [gl_cv_func_isnanl_in_libm=yes], | |
112 | [gl_cv_func_isnanl_in_libm=no]) | |
113 | LIBS="$save_LIBS" | |
114 | ]) | |
115 | ]) | |
116 | ||
4a626d0a PA |
117 | dnl Test whether isnanl() recognizes all canonical numbers which are neither |
118 | dnl finite nor infinite. | |
88b48903 WN |
119 | AC_DEFUN([gl_FUNC_ISNANL_WORKS], |
120 | [ | |
121 | AC_REQUIRE([AC_PROG_CC]) | |
122 | AC_REQUIRE([gl_BIGENDIAN]) | |
123 | AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) | |
124 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
125 | AC_CACHE_CHECK([whether isnanl works], [gl_cv_func_isnanl_works], | |
126 | [ | |
127 | AC_RUN_IFELSE( | |
128 | [AC_LANG_SOURCE([[ | |
129 | #include <float.h> | |
130 | #include <limits.h> | |
131 | #include <math.h> | |
698be2d8 CB |
132 | #ifndef __has_builtin |
133 | # define __has_builtin(name) 0 | |
134 | #endif | |
135 | #if __GNUC__ >= 4 && (!defined __clang__ || __has_builtin (__builtin_isnanl)) | |
88b48903 WN |
136 | # undef isnanl |
137 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
138 | #elif defined isnan | |
139 | # undef isnanl | |
140 | # define isnanl(x) isnan ((long double)(x)) | |
141 | #endif | |
142 | #define NWORDS \ | |
143 | ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) | |
144 | typedef union { unsigned int word[NWORDS]; long double value; } | |
145 | memory_long_double; | |
146 | /* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the | |
147 | runtime type conversion. */ | |
148 | #ifdef __sgi | |
149 | static long double NaNl () | |
150 | { | |
151 | double zero = 0.0; | |
152 | return zero / zero; | |
153 | } | |
154 | #else | |
155 | # define NaNl() (0.0L / 0.0L) | |
156 | #endif | |
157 | int main () | |
158 | { | |
159 | int result = 0; | |
160 | ||
161 | if (!isnanl (NaNl ())) | |
162 | result |= 1; | |
163 | ||
164 | { | |
165 | memory_long_double m; | |
166 | unsigned int i; | |
167 | ||
168 | /* The isnanl function should be immune against changes in the sign bit and | |
169 | in the mantissa bits. The xor operation twiddles a bit that can only be | |
170 | a sign bit or a mantissa bit (since the exponent never extends to | |
171 | bit 31). */ | |
172 | m.value = NaNl (); | |
173 | m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1); | |
174 | for (i = 0; i < NWORDS; i++) | |
175 | m.word[i] |= 1; | |
176 | if (!isnanl (m.value)) | |
177 | result |= 1; | |
178 | } | |
179 | ||
180 | #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE | |
181 | /* Representation of an 80-bit 'long double' as an initializer for a sequence | |
182 | of 'unsigned int' words. */ | |
183 | # ifdef WORDS_BIGENDIAN | |
184 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
185 | { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \ | |
4a626d0a | 186 | ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16), \ |
88b48903 WN |
187 | (unsigned int) (mantlo) << 16 \ |
188 | } | |
189 | # else | |
190 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
191 | { mantlo, manthi, exponent } | |
192 | # endif | |
193 | { /* Quiet NaN. */ | |
194 | static memory_long_double x = | |
195 | { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) }; | |
196 | if (!isnanl (x.value)) | |
197 | result |= 2; | |
198 | } | |
199 | { | |
200 | /* Signalling NaN. */ | |
201 | static memory_long_double x = | |
202 | { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) }; | |
203 | if (!isnanl (x.value)) | |
204 | result |= 2; | |
205 | } | |
4a626d0a | 206 | /* isnanl should return something even for noncanonical values. */ |
88b48903 WN |
207 | { /* Pseudo-NaN. */ |
208 | static memory_long_double x = | |
209 | { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) }; | |
4a626d0a | 210 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
211 | result |= 4; |
212 | } | |
213 | { /* Pseudo-Infinity. */ | |
214 | static memory_long_double x = | |
215 | { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) }; | |
4a626d0a | 216 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
217 | result |= 8; |
218 | } | |
219 | { /* Pseudo-Zero. */ | |
220 | static memory_long_double x = | |
221 | { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) }; | |
4a626d0a | 222 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
223 | result |= 16; |
224 | } | |
225 | { /* Unnormalized number. */ | |
226 | static memory_long_double x = | |
227 | { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) }; | |
4a626d0a | 228 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
229 | result |= 32; |
230 | } | |
231 | { /* Pseudo-Denormal. */ | |
232 | static memory_long_double x = | |
233 | { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) }; | |
4a626d0a | 234 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
235 | result |= 64; |
236 | } | |
237 | #endif | |
238 | ||
239 | return result; | |
240 | }]])], | |
241 | [gl_cv_func_isnanl_works=yes], | |
242 | [gl_cv_func_isnanl_works=no], | |
c0c3707f CB |
243 | [case "$host_os" in |
244 | mingw*) # Guess yes on mingw, no on MSVC. | |
245 | AC_EGREP_CPP([Known], [ | |
246 | #ifdef __MINGW32__ | |
247 | Known | |
248 | #endif | |
249 | ], | |
250 | [gl_cv_func_isnanl_works="guessing yes"], | |
251 | [gl_cv_func_isnanl_works="guessing no"]) | |
252 | ;; | |
253 | *) gl_cv_func_isnanl_works="guessing yes" ;; | |
254 | esac | |
255 | ]) | |
88b48903 WN |
256 | ]) |
257 | ]) |