-# isnanl.m4 serial 7
-dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
+# isnanl.m4 serial 17
+dnl Copyright (C) 2007-2013 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_ISNANL],
[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
ISNANL_LIBM=
gl_HAVE_ISNANL_NO_LIBM
if test $gl_cv_func_isnanl_no_libm = no; then
ISNANL_LIBM=-lm
fi
fi
+ dnl The variable gl_func_isnanl set here is used by isnan.m4.
if test $gl_cv_func_isnanl_no_libm = yes \
|| test $gl_cv_func_isnanl_in_libm = yes; then
save_LIBS="$LIBS"
else
gl_func_isnanl=no
fi
- if test $gl_func_isnanl = yes; then
- AC_DEFINE([HAVE_ISNANL], 1,
- [Define if the isnan(long double) function is available.])
- else
- gl_BUILD_ISNANL
+ if test $gl_func_isnanl != yes; then
+ HAVE_ISNANL=0
fi
AC_SUBST([ISNANL_LIBM])
])
esac
fi
if test $gl_func_isnanl_no_libm = yes; then
- AC_DEFINE([HAVE_ISNANL_IN_LIBC], 1,
+ AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1],
[Define if the isnan(long double) function is available in libc.])
- else
- gl_BUILD_ISNANL
fi
])
-dnl Pull in replacement isnanl definition.
-AC_DEFUN([gl_BUILD_ISNANL],
+dnl Prerequisites of replacement isnanl definition. It does not need -lm.
+AC_DEFUN([gl_PREREQ_ISNANL],
[
- AC_LIBOBJ([isnanl])
gl_LONG_DOUBLE_EXPONENT_LOCATION
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
])
dnl Test whether isnanl() can be used without libm.
AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm],
[gl_cv_func_isnanl_no_libm],
[
- AC_TRY_LINK([#include <math.h>
- #if __GNUC__ >= 4
- # undef isnanl
- # define isnanl(x) __builtin_isnanl ((long double)(x))
- #elif defined isnan
- # undef isnanl
- # define isnanl(x) isnan ((long double)(x))
- #endif
- long double x;],
- [return isnanl (x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnanl
+ # define isnanl(x) __builtin_isnanl ((long double)(x))
+ #elif defined isnan
+ # undef isnanl
+ # define isnanl(x) isnan ((long double)(x))
+ #endif
+ long double x;]],
+ [[return isnanl (x);]])],
[gl_cv_func_isnanl_no_libm=yes],
[gl_cv_func_isnanl_no_libm=no])
])
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
- AC_TRY_LINK([#include <math.h>
- #if __GNUC__ >= 4
- # undef isnanl
- # define isnanl(x) __builtin_isnanl ((long double)(x))
- #elif defined isnan
- # undef isnanl
- # define isnanl(x) isnan ((long double)(x))
- #endif
- long double x;],
- [return isnanl (x);],
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnanl
+ # define isnanl(x) __builtin_isnanl ((long double)(x))
+ #elif defined isnan
+ # undef isnanl
+ # define isnanl(x) isnan ((long double)(x))
+ #endif
+ long double x;]],
+ [[return isnanl (x);]])],
[gl_cv_func_isnanl_in_libm=yes],
[gl_cv_func_isnanl_in_libm=no])
LIBS="$save_LIBS"
AC_DEFUN([gl_FUNC_ISNANL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
- AC_REQUIRE([AC_C_BIGENDIAN])
+ AC_REQUIRE([gl_BIGENDIAN])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether isnanl works], [gl_cv_func_isnanl_works],
[
- AC_TRY_RUN([
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
#include <float.h>
#include <limits.h>
#include <math.h>
((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
typedef union { unsigned int word[NWORDS]; long double value; }
memory_long_double;
+/* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the
+ runtime type conversion. */
+#ifdef __sgi
+static long double NaNl ()
+{
+ double zero = 0.0;
+ return zero / zero;
+}
+#else
+# define NaNl() (0.0L / 0.0L)
+#endif
int main ()
{
- memory_long_double m;
- unsigned int i;
+ int result = 0;
- /* gcc-3.4.3 on IRIX 6.5 appears to have a problem with this. */
- if (!isnanl (0.0L / 0.0L))
- return 1;
+ if (!isnanl (NaNl ()))
+ result |= 1;
- /* The isnanl function should be immune against changes in the sign bit and
- in the mantissa bits. The xor operation twiddles a bit that can only be
- a sign bit or a mantissa bit (since the exponent never extends to
- bit 31). */
- m.value = 0.0L / 0.0L;
- m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
- for (i = 0; i < NWORDS; i++)
- m.word[i] |= 1;
- if (!isnanl (m.value))
- return 1;
+ {
+ memory_long_double m;
+ unsigned int i;
-#if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
+ /* The isnanl function should be immune against changes in the sign bit and
+ in the mantissa bits. The xor operation twiddles a bit that can only be
+ a sign bit or a mantissa bit (since the exponent never extends to
+ bit 31). */
+ m.value = NaNl ();
+ m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+ for (i = 0; i < NWORDS; i++)
+ m.word[i] |= 1;
+ if (!isnanl (m.value))
+ result |= 1;
+ }
+
+#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
/* Representation of an 80-bit 'long double' as an initializer for a sequence
of 'unsigned int' words. */
# ifdef WORDS_BIGENDIAN
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
if (!isnanl (x.value))
- return 1;
+ result |= 2;
}
{
/* Signalling NaN. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
if (!isnanl (x.value))
- return 1;
+ result |= 2;
}
/* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
if (!isnanl (x.value))
- return 1;
+ result |= 4;
}
{ /* Pseudo-Infinity. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
if (!isnanl (x.value))
- return 1;
+ result |= 8;
}
{ /* Pseudo-Zero. */
static memory_long_double x =
{ LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
if (!isnanl (x.value))
- return 1;
+ result |= 16;
}
{ /* Unnormalized number. */
static memory_long_double x =
{ LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
if (!isnanl (x.value))
- return 1;
+ result |= 32;
}
{ /* Pseudo-Denormal. */
static memory_long_double x =
{ LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
if (!isnanl (x.value))
- return 1;
+ result |= 64;
}
#endif
- return 0;
-}], [gl_cv_func_isnanl_works=yes], [gl_cv_func_isnanl_works=no],
- [case "$host_cpu" in
- # Guess no on ia64, x86_64, i386.
- ia64 | x86_64 | i*86) gl_cv_func_isnanl_works="guessing no";;
- *)
- case "$host_os" in
- netbsd*) gl_cv_func_isnanl_works="guessing no";;
- *) gl_cv_func_isnanl_works="guessing yes";;
- esac
- ;;
- esac
- ])
- ])
-])
-
-AC_DEFUN([gl_LONG_DOUBLE_EXPONENT_LOCATION],
-[
- AC_REQUIRE([AC_C_BIGENDIAN])
- AC_CACHE_CHECK([where to find the exponent in a 'long double'],
- [gl_cv_cc_long_double_expbit0],
- [
- AC_TRY_RUN([
-#include <float.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <string.h>
-#define NWORDS \
- ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
-typedef union { long double value; unsigned int word[NWORDS]; }
- memory_long_double;
-static unsigned int ored_words[NWORDS];
-static unsigned int anded_words[NWORDS];
-static void add_to_ored_words (long double x)
-{
- memory_long_double m;
- size_t i;
- /* Clear it first, in case
- sizeof (long double) < sizeof (memory_long_double). */
- memset (&m, 0, sizeof (memory_long_double));
- m.value = x;
- for (i = 0; i < NWORDS; i++)
- {
- ored_words[i] |= m.word[i];
- anded_words[i] &= m.word[i];
- }
-}
-int main ()
-{
- size_t j;
- FILE *fp = fopen ("conftest.out", "w");
- if (fp == NULL)
- return 1;
- for (j = 0; j < NWORDS; j++)
- anded_words[j] = ~ (unsigned int) 0;
- add_to_ored_words (0.25L);
- add_to_ored_words (0.5L);
- add_to_ored_words (1.0L);
- add_to_ored_words (2.0L);
- add_to_ored_words (4.0L);
- /* Remove bits that are common (e.g. if representation of the first mantissa
- bit is explicit). */
- for (j = 0; j < NWORDS; j++)
- ored_words[j] &= ~anded_words[j];
- /* Now find the nonzero word. */
- for (j = 0; j < NWORDS; j++)
- if (ored_words[j] != 0)
- break;
- if (j < NWORDS)
- {
- size_t i;
- for (i = j + 1; i < NWORDS; i++)
- if (ored_words[i] != 0)
- {
- fprintf (fp, "unknown");
- return (fclose (fp) != 0);
- }
- for (i = 0; ; i++)
- if ((ored_words[j] >> i) & 1)
- {
- fprintf (fp, "word %d bit %d", (int) j, (int) i);
- return (fclose (fp) != 0);
- }
- }
- fprintf (fp, "unknown");
- return (fclose (fp) != 0);
-}
- ],
- [gl_cv_cc_long_double_expbit0=`cat conftest.out`],
- [gl_cv_cc_long_double_expbit0="unknown"],
- [
- dnl When cross-compiling, we don't know. It depends on the
- dnl ABI and compiler version. There are too many cases.
- gl_cv_cc_long_double_expbit0="unknown"
+ return result;
+}]])],
+ [gl_cv_func_isnanl_works=yes],
+ [gl_cv_func_isnanl_works=no],
+ [case "$host_cpu" in
+ # Guess no on ia64, x86_64, i386.
+ ia64 | x86_64 | i*86) gl_cv_func_isnanl_works="guessing no";;
+ *)
+ case "$host_os" in
+ netbsd*) gl_cv_func_isnanl_works="guessing no";;
+ *) gl_cv_func_isnanl_works="guessing yes";;
+ esac
+ ;;
+ esac
])
- rm -f conftest.out
])
- case "$gl_cv_cc_long_double_expbit0" in
- word*bit*)
- word=`echo "$gl_cv_cc_long_double_expbit0" | sed -e 's/word //' -e 's/ bit.*//'`
- bit=`echo "$gl_cv_cc_long_double_expbit0" | sed -e 's/word.*bit //'`
- AC_DEFINE_UNQUOTED([LDBL_EXPBIT0_WORD], [$word],
- [Define as the word index where to find the exponent of 'long double'.])
- AC_DEFINE_UNQUOTED([LDBL_EXPBIT0_BIT], [$bit],
- [Define as the bit index in the word where to find bit 0 of the exponent of 'long double'.])
- ;;
- esac
])
projects / gnulib.git / blobdiff