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35428fb6 | 1 | # isnanl.m4 serial 17 |
f0007cad | 2 | dnl Copyright (C) 2007-2012 Free Software Foundation, Inc. |
2e65b52f LC |
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 | |
3d458a81 | 18 | dnl The variable gl_func_isnanl set here is used by isnan.m4. |
2e65b52f LC |
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 $gl_func_isnanl != yes; then | |
33 | HAVE_ISNANL=0 | |
2e65b52f LC |
34 | fi |
35 | AC_SUBST([ISNANL_LIBM]) | |
36 | ]) | |
37 | ||
38 | AC_DEFUN([gl_FUNC_ISNANL_NO_LIBM], | |
39 | [ | |
40 | gl_HAVE_ISNANL_NO_LIBM | |
41 | gl_func_isnanl_no_libm=$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 $gl_func_isnanl_no_libm = yes; then | |
50 | AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1], | |
51 | [Define if the isnan(long double) function is available in libc.]) | |
2e65b52f LC |
52 | fi |
53 | ]) | |
54 | ||
3d458a81 AW |
55 | dnl Prerequisites of replacement isnanl definition. It does not need -lm. |
56 | AC_DEFUN([gl_PREREQ_ISNANL], | |
2e65b52f | 57 | [ |
2e65b52f | 58 | gl_LONG_DOUBLE_EXPONENT_LOCATION |
35428fb6 | 59 | AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) |
2e65b52f LC |
60 | ]) |
61 | ||
62 | dnl Test whether isnanl() can be used without libm. | |
63 | AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM], | |
64 | [ | |
65 | AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm], | |
66 | [gl_cv_func_isnanl_no_libm], | |
67 | [ | |
68 | AC_LINK_IFELSE( | |
69 | [AC_LANG_PROGRAM( | |
70 | [[#include <math.h> | |
71 | #if __GNUC__ >= 4 | |
72 | # undef isnanl | |
73 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
74 | #elif defined isnan | |
75 | # undef isnanl | |
76 | # define isnanl(x) isnan ((long double)(x)) | |
77 | #endif | |
78 | long double x;]], | |
79 | [[return isnanl (x);]])], | |
80 | [gl_cv_func_isnanl_no_libm=yes], | |
81 | [gl_cv_func_isnanl_no_libm=no]) | |
82 | ]) | |
83 | ]) | |
84 | ||
85 | dnl Test whether isnanl() can be used with libm. | |
86 | AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM], | |
87 | [ | |
88 | AC_CACHE_CHECK([whether isnan(long double) can be used with libm], | |
89 | [gl_cv_func_isnanl_in_libm], | |
90 | [ | |
91 | save_LIBS="$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 | ||
111 | dnl Test whether isnanl() recognizes all numbers which are neither finite nor | |
112 | dnl infinite. This test fails e.g. on NetBSD/i386 and on glibc/ia64. | |
113 | dnl Also, the GCC >= 4.0 built-in __builtin_isnanl does not pass the tests | |
114 | dnl - for pseudo-denormals on i686 and x86_64, | |
115 | dnl - for pseudo-zeroes, unnormalized numbers, and pseudo-denormals on ia64. | |
116 | AC_DEFUN([gl_FUNC_ISNANL_WORKS], | |
117 | [ | |
118 | AC_REQUIRE([AC_PROG_CC]) | |
119 | AC_REQUIRE([gl_BIGENDIAN]) | |
35428fb6 | 120 | AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE]) |
2e65b52f LC |
121 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
122 | AC_CACHE_CHECK([whether isnanl works], [gl_cv_func_isnanl_works], | |
123 | [ | |
124 | AC_RUN_IFELSE( | |
125 | [AC_LANG_SOURCE([[ | |
126 | #include <float.h> | |
127 | #include <limits.h> | |
128 | #include <math.h> | |
129 | #if __GNUC__ >= 4 | |
130 | # undef isnanl | |
131 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
132 | #elif defined isnan | |
133 | # undef isnanl | |
134 | # define isnanl(x) isnan ((long double)(x)) | |
135 | #endif | |
136 | #define NWORDS \ | |
137 | ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) | |
138 | typedef union { unsigned int word[NWORDS]; long double value; } | |
139 | memory_long_double; | |
140 | /* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the | |
141 | runtime type conversion. */ | |
142 | #ifdef __sgi | |
143 | static long double NaNl () | |
144 | { | |
145 | double zero = 0.0; | |
146 | return zero / zero; | |
147 | } | |
148 | #else | |
149 | # define NaNl() (0.0L / 0.0L) | |
150 | #endif | |
151 | int main () | |
152 | { | |
0f00f2c3 | 153 | int result = 0; |
2e65b52f LC |
154 | |
155 | if (!isnanl (NaNl ())) | |
0f00f2c3 | 156 | result |= 1; |
2e65b52f | 157 | |
0f00f2c3 LC |
158 | { |
159 | memory_long_double m; | |
160 | unsigned int i; | |
161 | ||
162 | /* The isnanl function should be immune against changes in the sign bit and | |
163 | in the mantissa bits. The xor operation twiddles a bit that can only be | |
164 | a sign bit or a mantissa bit (since the exponent never extends to | |
165 | bit 31). */ | |
166 | m.value = NaNl (); | |
167 | m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1); | |
168 | for (i = 0; i < NWORDS; i++) | |
169 | m.word[i] |= 1; | |
170 | if (!isnanl (m.value)) | |
171 | result |= 1; | |
172 | } | |
2e65b52f | 173 | |
35428fb6 | 174 | #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 |
2e65b52f LC |
175 | /* Representation of an 80-bit 'long double' as an initializer for a sequence |
176 | of 'unsigned int' words. */ | |
177 | # ifdef WORDS_BIGENDIAN | |
178 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
179 | { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \ | |
180 | ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \ | |
181 | (unsigned int) (mantlo) << 16 \ | |
182 | } | |
183 | # else | |
184 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
185 | { mantlo, manthi, exponent } | |
186 | # endif | |
187 | { /* Quiet NaN. */ | |
188 | static memory_long_double x = | |
189 | { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) }; | |
190 | if (!isnanl (x.value)) | |
0f00f2c3 | 191 | result |= 2; |
2e65b52f LC |
192 | } |
193 | { | |
194 | /* Signalling NaN. */ | |
195 | static memory_long_double x = | |
196 | { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) }; | |
197 | if (!isnanl (x.value)) | |
0f00f2c3 | 198 | result |= 2; |
2e65b52f LC |
199 | } |
200 | /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities, | |
201 | Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in | |
202 | Intel IA-64 Architecture Software Developer's Manual, Volume 1: | |
203 | Application Architecture. | |
204 | Table 5-2 "Floating-Point Register Encodings" | |
205 | Figure 5-6 "Memory to Floating-Point Register Data Translation" | |
206 | */ | |
207 | { /* Pseudo-NaN. */ | |
208 | static memory_long_double x = | |
209 | { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) }; | |
210 | if (!isnanl (x.value)) | |
0f00f2c3 | 211 | result |= 4; |
2e65b52f LC |
212 | } |
213 | { /* Pseudo-Infinity. */ | |
214 | static memory_long_double x = | |
215 | { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) }; | |
216 | if (!isnanl (x.value)) | |
0f00f2c3 | 217 | result |= 8; |
2e65b52f LC |
218 | } |
219 | { /* Pseudo-Zero. */ | |
220 | static memory_long_double x = | |
221 | { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) }; | |
222 | if (!isnanl (x.value)) | |
0f00f2c3 | 223 | result |= 16; |
2e65b52f LC |
224 | } |
225 | { /* Unnormalized number. */ | |
226 | static memory_long_double x = | |
227 | { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) }; | |
228 | if (!isnanl (x.value)) | |
0f00f2c3 | 229 | result |= 32; |
2e65b52f LC |
230 | } |
231 | { /* Pseudo-Denormal. */ | |
232 | static memory_long_double x = | |
233 | { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) }; | |
234 | if (!isnanl (x.value)) | |
0f00f2c3 | 235 | result |= 64; |
2e65b52f LC |
236 | } |
237 | #endif | |
238 | ||
0f00f2c3 | 239 | return result; |
2e65b52f LC |
240 | }]])], |
241 | [gl_cv_func_isnanl_works=yes], | |
242 | [gl_cv_func_isnanl_works=no], | |
243 | [case "$host_cpu" in | |
244 | # Guess no on ia64, x86_64, i386. | |
245 | ia64 | x86_64 | i*86) gl_cv_func_isnanl_works="guessing no";; | |
246 | *) | |
247 | case "$host_os" in | |
248 | netbsd*) gl_cv_func_isnanl_works="guessing no";; | |
249 | *) gl_cv_func_isnanl_works="guessing yes";; | |
250 | esac | |
251 | ;; | |
252 | esac | |
253 | ]) | |
254 | ]) | |
255 | ]) |