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# isnanl.m4 serial 12
dnl Copyright (C) 2007-2010 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
gl_HAVE_ISNANL_IN_LIBM
if test $gl_cv_func_isnanl_in_libm = yes; then
ISNANL_LIBM=-lm
fi
fi
if test $gl_cv_func_isnanl_no_libm = yes \
|| test $gl_cv_func_isnanl_in_libm = yes; then
save_LIBS="$LIBS"
LIBS="$LIBS $ISNANL_LIBM"
gl_FUNC_ISNANL_WORKS
LIBS="$save_LIBS"
case "$gl_cv_func_isnanl_works" in
*yes) gl_func_isnanl=yes ;;
*) gl_func_isnanl=no; ISNANL_LIBM= ;;
esac
else
gl_func_isnanl=no
fi
if test $gl_func_isnanl != yes; then
HAVE_ISNANL=0
gl_BUILD_ISNANL
fi
AC_SUBST([ISNANL_LIBM])
])
AC_DEFUN([gl_FUNC_ISNANL_NO_LIBM],
[
gl_HAVE_ISNANL_NO_LIBM
gl_func_isnanl_no_libm=$gl_cv_func_isnanl_no_libm
if test $gl_func_isnanl_no_libm = yes; then
gl_FUNC_ISNANL_WORKS
case "$gl_cv_func_isnanl_works" in
*yes) ;;
*) gl_func_isnanl_no_libm=no ;;
esac
fi
if test $gl_func_isnanl_no_libm = yes; then
AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1],
[Define if the isnan(long double) function is available in libc.])
else
gl_BUILD_ISNANL
fi
])
dnl Pull in replacement isnanl definition. It does not need -lm.
AC_DEFUN([gl_BUILD_ISNANL],
[
AC_LIBOBJ([isnanl])
gl_LONG_DOUBLE_EXPONENT_LOCATION
])
dnl Test whether isnanl() can be used without libm.
AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM],
[
AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm],
[gl_cv_func_isnanl_no_libm],
[
AC_TRY_LINK([#include <math.h>
#if __GNUC__ >= 4
# undef isnanl
# define isnanl(x) __builtin_isnanl ((long double)(x))
#elif defined isnan
# undef isnanl
# define isnanl(x) isnan ((long double)(x))
#endif
long double x;],
[return isnanl (x);],
[gl_cv_func_isnanl_no_libm=yes],
[gl_cv_func_isnanl_no_libm=no])
])
])
dnl Test whether isnanl() can be used with libm.
AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM],
[
AC_CACHE_CHECK([whether isnan(long double) can be used with libm],
[gl_cv_func_isnanl_in_libm],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
AC_TRY_LINK([#include <math.h>
#if __GNUC__ >= 4
# undef isnanl
# define isnanl(x) __builtin_isnanl ((long double)(x))
#elif defined isnan
# undef isnanl
# define isnanl(x) isnan ((long double)(x))
#endif
long double x;],
[return isnanl (x);],
[gl_cv_func_isnanl_in_libm=yes],
[gl_cv_func_isnanl_in_libm=no])
LIBS="$save_LIBS"
])
])
dnl Test whether isnanl() recognizes all numbers which are neither finite nor
dnl infinite. This test fails e.g. on NetBSD/i386 and on glibc/ia64.
dnl Also, the GCC >= 4.0 built-in __builtin_isnanl does not pass the tests
dnl - for pseudo-denormals on i686 and x86_64,
dnl - for pseudo-zeroes, unnormalized numbers, and pseudo-denormals on ia64.
AC_DEFUN([gl_FUNC_ISNANL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([gl_BIGENDIAN])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether isnanl works], [gl_cv_func_isnanl_works],
[
AC_TRY_RUN([
#include <float.h>
#include <limits.h>
#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
#define NWORDS \
((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;
if (!isnanl (NaNl ()))
return 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 = 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))
return 1;
#if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
/* Representation of an 80-bit 'long double' as an initializer for a sequence
of 'unsigned int' words. */
# ifdef WORDS_BIGENDIAN
# define LDBL80_WORDS(exponent,manthi,mantlo) \
{ ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
(unsigned int) (mantlo) << 16 \
}
# else
# define LDBL80_WORDS(exponent,manthi,mantlo) \
{ mantlo, manthi, exponent }
# endif
{ /* Quiet NaN. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
if (!isnanl (x.value))
return 1;
}
{
/* Signalling NaN. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
if (!isnanl (x.value))
return 1;
}
/* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
Intel IA-64 Architecture Software Developer's Manual, Volume 1:
Application Architecture.
Table 5-2 "Floating-Point Register Encodings"
Figure 5-6 "Memory to Floating-Point Register Data Translation"
*/
{ /* Pseudo-NaN. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
if (!isnanl (x.value))
return 1;
}
{ /* Pseudo-Infinity. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
if (!isnanl (x.value))
return 1;
}
{ /* Pseudo-Zero. */
static memory_long_double x =
{ LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
if (!isnanl (x.value))
return 1;
}
{ /* Unnormalized number. */
static memory_long_double x =
{ LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
if (!isnanl (x.value))
return 1;
}
{ /* Pseudo-Denormal. */
static memory_long_double x =
{ LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
if (!isnanl (x.value))
return 1;
}
#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
])
])
])
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