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5e8754f9 SDJ |
1 | # isnanl.m4 serial 19 |
2 | dnl Copyright (C) 2007-2016 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 $gl_func_isnanl_no_libm = yes; then | |
50 | AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1], | |
51 | [Define if the isnan(long double) function is available in libc.]) | |
52 | fi | |
53 | ]) | |
54 | ||
55 | dnl Prerequisites of replacement isnanl definition. It does not need -lm. | |
56 | AC_DEFUN([gl_PREREQ_ISNANL], | |
57 | [ | |
58 | gl_LONG_DOUBLE_EXPONENT_LOCATION | |
59 | AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) | |
60 | ]) | |
61 | ||
62 | dnl Test whether isnanl() can be used without libm. | |
63 | AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM], | |
64 | [ | |
65 | AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm], | |
66 | [gl_cv_func_isnanl_no_libm], | |
67 | [ | |
68 | AC_LINK_IFELSE( | |
69 | [AC_LANG_PROGRAM( | |
70 | [[#include <math.h> | |
71 | #if __GNUC__ >= 4 | |
72 | # undef isnanl | |
73 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
74 | #elif defined isnan | |
75 | # undef isnanl | |
76 | # define isnanl(x) isnan ((long double)(x)) | |
77 | #endif | |
78 | long double x;]], | |
79 | [[return isnanl (x);]])], | |
80 | [gl_cv_func_isnanl_no_libm=yes], | |
81 | [gl_cv_func_isnanl_no_libm=no]) | |
82 | ]) | |
83 | ]) | |
84 | ||
85 | dnl Test whether isnanl() can be used with libm. | |
86 | AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM], | |
87 | [ | |
88 | AC_CACHE_CHECK([whether isnan(long double) can be used with libm], | |
89 | [gl_cv_func_isnanl_in_libm], | |
90 | [ | |
91 | save_LIBS="$LIBS" | |
92 | LIBS="$LIBS -lm" | |
93 | AC_LINK_IFELSE( | |
94 | [AC_LANG_PROGRAM( | |
95 | [[#include <math.h> | |
96 | #if __GNUC__ >= 4 | |
97 | # undef isnanl | |
98 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
99 | #elif defined isnan | |
100 | # undef isnanl | |
101 | # define isnanl(x) isnan ((long double)(x)) | |
102 | #endif | |
103 | long double x;]], | |
104 | [[return isnanl (x);]])], | |
105 | [gl_cv_func_isnanl_in_libm=yes], | |
106 | [gl_cv_func_isnanl_in_libm=no]) | |
107 | LIBS="$save_LIBS" | |
108 | ]) | |
109 | ]) | |
110 | ||
4a626d0a PA |
111 | dnl Test whether isnanl() recognizes all canonical numbers which are neither |
112 | dnl finite nor infinite. | |
88b48903 WN |
113 | AC_DEFUN([gl_FUNC_ISNANL_WORKS], |
114 | [ | |
115 | AC_REQUIRE([AC_PROG_CC]) | |
116 | AC_REQUIRE([gl_BIGENDIAN]) | |
117 | AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) | |
118 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
119 | AC_CACHE_CHECK([whether isnanl works], [gl_cv_func_isnanl_works], | |
120 | [ | |
121 | AC_RUN_IFELSE( | |
122 | [AC_LANG_SOURCE([[ | |
123 | #include <float.h> | |
124 | #include <limits.h> | |
125 | #include <math.h> | |
126 | #if __GNUC__ >= 4 | |
127 | # undef isnanl | |
128 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
129 | #elif defined isnan | |
130 | # undef isnanl | |
131 | # define isnanl(x) isnan ((long double)(x)) | |
132 | #endif | |
133 | #define NWORDS \ | |
134 | ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) | |
135 | typedef union { unsigned int word[NWORDS]; long double value; } | |
136 | memory_long_double; | |
137 | /* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the | |
138 | runtime type conversion. */ | |
139 | #ifdef __sgi | |
140 | static long double NaNl () | |
141 | { | |
142 | double zero = 0.0; | |
143 | return zero / zero; | |
144 | } | |
145 | #else | |
146 | # define NaNl() (0.0L / 0.0L) | |
147 | #endif | |
148 | int main () | |
149 | { | |
150 | int result = 0; | |
151 | ||
152 | if (!isnanl (NaNl ())) | |
153 | result |= 1; | |
154 | ||
155 | { | |
156 | memory_long_double m; | |
157 | unsigned int i; | |
158 | ||
159 | /* The isnanl function should be immune against changes in the sign bit and | |
160 | in the mantissa bits. The xor operation twiddles a bit that can only be | |
161 | a sign bit or a mantissa bit (since the exponent never extends to | |
162 | bit 31). */ | |
163 | m.value = NaNl (); | |
164 | m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1); | |
165 | for (i = 0; i < NWORDS; i++) | |
166 | m.word[i] |= 1; | |
167 | if (!isnanl (m.value)) | |
168 | result |= 1; | |
169 | } | |
170 | ||
171 | #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 | |
172 | /* Representation of an 80-bit 'long double' as an initializer for a sequence | |
173 | of 'unsigned int' words. */ | |
174 | # ifdef WORDS_BIGENDIAN | |
175 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
176 | { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \ | |
4a626d0a | 177 | ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16), \ |
88b48903 WN |
178 | (unsigned int) (mantlo) << 16 \ |
179 | } | |
180 | # else | |
181 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
182 | { mantlo, manthi, exponent } | |
183 | # endif | |
184 | { /* Quiet NaN. */ | |
185 | static memory_long_double x = | |
186 | { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) }; | |
187 | if (!isnanl (x.value)) | |
188 | result |= 2; | |
189 | } | |
190 | { | |
191 | /* Signalling NaN. */ | |
192 | static memory_long_double x = | |
193 | { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) }; | |
194 | if (!isnanl (x.value)) | |
195 | result |= 2; | |
196 | } | |
4a626d0a | 197 | /* isnanl should return something even for noncanonical values. */ |
88b48903 WN |
198 | { /* Pseudo-NaN. */ |
199 | static memory_long_double x = | |
200 | { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) }; | |
4a626d0a | 201 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
202 | result |= 4; |
203 | } | |
204 | { /* Pseudo-Infinity. */ | |
205 | static memory_long_double x = | |
206 | { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) }; | |
4a626d0a | 207 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
208 | result |= 8; |
209 | } | |
210 | { /* Pseudo-Zero. */ | |
211 | static memory_long_double x = | |
212 | { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) }; | |
4a626d0a | 213 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
214 | result |= 16; |
215 | } | |
216 | { /* Unnormalized number. */ | |
217 | static memory_long_double x = | |
218 | { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) }; | |
4a626d0a | 219 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
220 | result |= 32; |
221 | } | |
222 | { /* Pseudo-Denormal. */ | |
223 | static memory_long_double x = | |
224 | { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) }; | |
4a626d0a | 225 | if (isnanl (x.value) && !isnanl (x.value)) |
88b48903 WN |
226 | result |= 64; |
227 | } | |
228 | #endif | |
229 | ||
230 | return result; | |
231 | }]])], | |
232 | [gl_cv_func_isnanl_works=yes], | |
233 | [gl_cv_func_isnanl_works=no], | |
5e8754f9 | 234 | [gl_cv_func_isnanl_works="guessing yes"]) |
88b48903 WN |
235 | ]) |
236 | ]) |