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0f00f2c3 | 1 | # isnanl.m4 serial 14 |
49114fd4 | 2 | dnl Copyright (C) 2007-2011 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 | |
18 | if test $gl_cv_func_isnanl_no_libm = yes \ | |
19 | || test $gl_cv_func_isnanl_in_libm = yes; then | |
20 | save_LIBS="$LIBS" | |
21 | LIBS="$LIBS $ISNANL_LIBM" | |
22 | gl_FUNC_ISNANL_WORKS | |
23 | LIBS="$save_LIBS" | |
24 | case "$gl_cv_func_isnanl_works" in | |
25 | *yes) gl_func_isnanl=yes ;; | |
26 | *) gl_func_isnanl=no; ISNANL_LIBM= ;; | |
27 | esac | |
28 | else | |
29 | gl_func_isnanl=no | |
30 | fi | |
31 | if test $gl_func_isnanl != yes; then | |
32 | HAVE_ISNANL=0 | |
33 | gl_BUILD_ISNANL | |
34 | fi | |
35 | AC_SUBST([ISNANL_LIBM]) | |
36 | ]) | |
37 | ||
38 | AC_DEFUN([gl_FUNC_ISNANL_NO_LIBM], | |
39 | [ | |
40 | gl_HAVE_ISNANL_NO_LIBM | |
41 | gl_func_isnanl_no_libm=$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 $gl_func_isnanl_no_libm = yes; then | |
50 | AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1], | |
51 | [Define if the isnan(long double) function is available in libc.]) | |
52 | else | |
53 | gl_BUILD_ISNANL | |
54 | fi | |
55 | ]) | |
56 | ||
57 | dnl Pull in replacement isnanl definition. It does not need -lm. | |
58 | AC_DEFUN([gl_BUILD_ISNANL], | |
59 | [ | |
60 | AC_LIBOBJ([isnanl]) | |
61 | gl_LONG_DOUBLE_EXPONENT_LOCATION | |
62 | ]) | |
63 | ||
64 | dnl Test whether isnanl() can be used without libm. | |
65 | AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM], | |
66 | [ | |
67 | AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm], | |
68 | [gl_cv_func_isnanl_no_libm], | |
69 | [ | |
70 | AC_LINK_IFELSE( | |
71 | [AC_LANG_PROGRAM( | |
72 | [[#include <math.h> | |
73 | #if __GNUC__ >= 4 | |
74 | # undef isnanl | |
75 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
76 | #elif defined isnan | |
77 | # undef isnanl | |
78 | # define isnanl(x) isnan ((long double)(x)) | |
79 | #endif | |
80 | long double x;]], | |
81 | [[return isnanl (x);]])], | |
82 | [gl_cv_func_isnanl_no_libm=yes], | |
83 | [gl_cv_func_isnanl_no_libm=no]) | |
84 | ]) | |
85 | ]) | |
86 | ||
87 | dnl Test whether isnanl() can be used with libm. | |
88 | AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM], | |
89 | [ | |
90 | AC_CACHE_CHECK([whether isnan(long double) can be used with libm], | |
91 | [gl_cv_func_isnanl_in_libm], | |
92 | [ | |
93 | save_LIBS="$LIBS" | |
94 | LIBS="$LIBS -lm" | |
95 | AC_LINK_IFELSE( | |
96 | [AC_LANG_PROGRAM( | |
97 | [[#include <math.h> | |
98 | #if __GNUC__ >= 4 | |
99 | # undef isnanl | |
100 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
101 | #elif defined isnan | |
102 | # undef isnanl | |
103 | # define isnanl(x) isnan ((long double)(x)) | |
104 | #endif | |
105 | long double x;]], | |
106 | [[return isnanl (x);]])], | |
107 | [gl_cv_func_isnanl_in_libm=yes], | |
108 | [gl_cv_func_isnanl_in_libm=no]) | |
109 | LIBS="$save_LIBS" | |
110 | ]) | |
111 | ]) | |
112 | ||
113 | dnl Test whether isnanl() recognizes all numbers which are neither finite nor | |
114 | dnl infinite. This test fails e.g. on NetBSD/i386 and on glibc/ia64. | |
115 | dnl Also, the GCC >= 4.0 built-in __builtin_isnanl does not pass the tests | |
116 | dnl - for pseudo-denormals on i686 and x86_64, | |
117 | dnl - for pseudo-zeroes, unnormalized numbers, and pseudo-denormals on ia64. | |
118 | AC_DEFUN([gl_FUNC_ISNANL_WORKS], | |
119 | [ | |
120 | AC_REQUIRE([AC_PROG_CC]) | |
121 | AC_REQUIRE([gl_BIGENDIAN]) | |
122 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
123 | AC_CACHE_CHECK([whether isnanl works], [gl_cv_func_isnanl_works], | |
124 | [ | |
125 | AC_RUN_IFELSE( | |
126 | [AC_LANG_SOURCE([[ | |
127 | #include <float.h> | |
128 | #include <limits.h> | |
129 | #include <math.h> | |
130 | #if __GNUC__ >= 4 | |
131 | # undef isnanl | |
132 | # define isnanl(x) __builtin_isnanl ((long double)(x)) | |
133 | #elif defined isnan | |
134 | # undef isnanl | |
135 | # define isnanl(x) isnan ((long double)(x)) | |
136 | #endif | |
137 | #define NWORDS \ | |
138 | ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) | |
139 | typedef union { unsigned int word[NWORDS]; long double value; } | |
140 | memory_long_double; | |
141 | /* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the | |
142 | runtime type conversion. */ | |
143 | #ifdef __sgi | |
144 | static long double NaNl () | |
145 | { | |
146 | double zero = 0.0; | |
147 | return zero / zero; | |
148 | } | |
149 | #else | |
150 | # define NaNl() (0.0L / 0.0L) | |
151 | #endif | |
152 | int main () | |
153 | { | |
0f00f2c3 | 154 | int result = 0; |
2e65b52f LC |
155 | |
156 | if (!isnanl (NaNl ())) | |
0f00f2c3 | 157 | result |= 1; |
2e65b52f | 158 | |
0f00f2c3 LC |
159 | { |
160 | memory_long_double m; | |
161 | unsigned int i; | |
162 | ||
163 | /* The isnanl function should be immune against changes in the sign bit and | |
164 | in the mantissa bits. The xor operation twiddles a bit that can only be | |
165 | a sign bit or a mantissa bit (since the exponent never extends to | |
166 | bit 31). */ | |
167 | m.value = NaNl (); | |
168 | m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1); | |
169 | for (i = 0; i < NWORDS; i++) | |
170 | m.word[i] |= 1; | |
171 | if (!isnanl (m.value)) | |
172 | result |= 1; | |
173 | } | |
2e65b52f LC |
174 | |
175 | #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) | |
176 | /* Representation of an 80-bit 'long double' as an initializer for a sequence | |
177 | of 'unsigned int' words. */ | |
178 | # ifdef WORDS_BIGENDIAN | |
179 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
180 | { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \ | |
181 | ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \ | |
182 | (unsigned int) (mantlo) << 16 \ | |
183 | } | |
184 | # else | |
185 | # define LDBL80_WORDS(exponent,manthi,mantlo) \ | |
186 | { mantlo, manthi, exponent } | |
187 | # endif | |
188 | { /* Quiet NaN. */ | |
189 | static memory_long_double x = | |
190 | { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) }; | |
191 | if (!isnanl (x.value)) | |
0f00f2c3 | 192 | result |= 2; |
2e65b52f LC |
193 | } |
194 | { | |
195 | /* Signalling NaN. */ | |
196 | static memory_long_double x = | |
197 | { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) }; | |
198 | if (!isnanl (x.value)) | |
0f00f2c3 | 199 | result |= 2; |
2e65b52f LC |
200 | } |
201 | /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities, | |
202 | Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in | |
203 | Intel IA-64 Architecture Software Developer's Manual, Volume 1: | |
204 | Application Architecture. | |
205 | Table 5-2 "Floating-Point Register Encodings" | |
206 | Figure 5-6 "Memory to Floating-Point Register Data Translation" | |
207 | */ | |
208 | { /* Pseudo-NaN. */ | |
209 | static memory_long_double x = | |
210 | { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) }; | |
211 | if (!isnanl (x.value)) | |
0f00f2c3 | 212 | result |= 4; |
2e65b52f LC |
213 | } |
214 | { /* Pseudo-Infinity. */ | |
215 | static memory_long_double x = | |
216 | { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) }; | |
217 | if (!isnanl (x.value)) | |
0f00f2c3 | 218 | result |= 8; |
2e65b52f LC |
219 | } |
220 | { /* Pseudo-Zero. */ | |
221 | static memory_long_double x = | |
222 | { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) }; | |
223 | if (!isnanl (x.value)) | |
0f00f2c3 | 224 | result |= 16; |
2e65b52f LC |
225 | } |
226 | { /* Unnormalized number. */ | |
227 | static memory_long_double x = | |
228 | { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) }; | |
229 | if (!isnanl (x.value)) | |
0f00f2c3 | 230 | result |= 32; |
2e65b52f LC |
231 | } |
232 | { /* Pseudo-Denormal. */ | |
233 | static memory_long_double x = | |
234 | { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) }; | |
235 | if (!isnanl (x.value)) | |
0f00f2c3 | 236 | result |= 64; |
2e65b52f LC |
237 | } |
238 | #endif | |
239 | ||
0f00f2c3 | 240 | return result; |
2e65b52f LC |
241 | }]])], |
242 | [gl_cv_func_isnanl_works=yes], | |
243 | [gl_cv_func_isnanl_works=no], | |
244 | [case "$host_cpu" in | |
245 | # Guess no on ia64, x86_64, i386. | |
246 | ia64 | x86_64 | i*86) gl_cv_func_isnanl_works="guessing no";; | |
247 | *) | |
248 | case "$host_os" in | |
249 | netbsd*) gl_cv_func_isnanl_works="guessing no";; | |
250 | *) gl_cv_func_isnanl_works="guessing yes";; | |
251 | esac | |
252 | ;; | |
253 | esac | |
254 | ]) | |
255 | ]) | |
256 | ]) |