[bpt/guile.git] / m4 / isnanl.m4

# isnanl.m4 serial 17
dnl Copyright (C) 2007-2012 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
  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"
    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
  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.])
  fi
])

dnl Prerequisites of replacement isnanl definition. It does not need -lm.
AC_DEFUN([gl_PREREQ_ISNANL],
[
  gl_LONG_DOUBLE_EXPONENT_LOCATION
  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
])

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_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])
    ])
])

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_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"
    ])
])

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([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_RUN_IFELSE(
        [AC_LANG_SOURCE([[
#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 ()
{
  int result = 0;

  if (!isnanl (NaNl ()))
    result |= 1;

  {
    memory_long_double m;
    unsigned int i;

    /* 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
#  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))
      result |= 2;
  }
  {
    /* Signalling NaN.  */
    static memory_long_double x =
      { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
    if (!isnanl (x.value))
      result |= 2;
  }
  /* 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))
      result |= 4;
  }
  { /* Pseudo-Infinity.  */
    static memory_long_double x =
      { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
    if (!isnanl (x.value))
      result |= 8;
  }
  { /* Pseudo-Zero.  */
    static memory_long_double x =
      { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
    if (!isnanl (x.value))
      result |= 16;
  }
  { /* Unnormalized number.  */
    static memory_long_double x =
      { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
    if (!isnanl (x.value))
      result |= 32;
  }
  { /* Pseudo-Denormal.  */
    static memory_long_double x =
      { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
    if (!isnanl (x.value))
      result |= 64;
  }
#endif

  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
        ])
    ])
])
Commit	Line	Data
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 $gl_func_isnanl_no_libm = yes; then
	50	AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1],
	51	[Define if the isnan(long double) function is available in libc.])
2e65b52f LC	52	fi
	53	])
	54
3d458a81 AW	55	dnl Prerequisites of replacement isnanl definition. It does not need -lm.
3d458a81 AW	56	AC_DEFUN([gl_PREREQ_ISNANL],
2e65b52f	57	[
2e65b52f	58	gl_LONG_DOUBLE_EXPONENT_LOCATION
35428fb6	59	AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
2e65b52f LC	60	])
	61
	62	dnl Test whether isnanl() can be used without libm.
	63	AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM],
	64	[
	65	AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm],
	66	[gl_cv_func_isnanl_no_libm],
	67	[
	68	AC_LINK_IFELSE(
	69	[AC_LANG_PROGRAM(
	70	[[#include <math.h>
	71	#if __GNUC__ >= 4
	72	# undef isnanl
	73	# define isnanl(x) __builtin_isnanl ((long double)(x))
	74	#elif defined isnan
	75	# undef isnanl
	76	# define isnanl(x) isnan ((long double)(x))
	77	#endif
	78	long double x;]],
	79	[[return isnanl (x);]])],
	80	[gl_cv_func_isnanl_no_libm=yes],
	81	[gl_cv_func_isnanl_no_libm=no])
	82	])
	83	])
	84
	85	dnl Test whether isnanl() can be used with libm.
	86	AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM],
	87	[
	88	AC_CACHE_CHECK([whether isnan(long double) can be used with libm],
	89	[gl_cv_func_isnanl_in_libm],
	90	[
	91	save_LIBS="$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
2e65b52f LC	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	])