249 lines
7.3 KiB
Plaintext
249 lines
7.3 KiB
Plaintext
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# isnanl.m4 serial 22
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dnl Copyright (C) 2007-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_ISNANL],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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ISNANL_LIBM=
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gl_HAVE_ISNANL_NO_LIBM
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if test $gl_cv_func_isnanl_no_libm = no; then
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gl_HAVE_ISNANL_IN_LIBM
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if test $gl_cv_func_isnanl_in_libm = yes; then
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ISNANL_LIBM=-lm
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fi
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fi
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dnl The variable gl_func_isnanl set here is used by isnan.m4.
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if test $gl_cv_func_isnanl_no_libm = yes \
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|| test $gl_cv_func_isnanl_in_libm = yes; then
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save_LIBS="$LIBS"
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LIBS="$LIBS $ISNANL_LIBM"
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gl_FUNC_ISNANL_WORKS
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LIBS="$save_LIBS"
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case "$gl_cv_func_isnanl_works" in
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*yes) gl_func_isnanl=yes ;;
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*) gl_func_isnanl=no; ISNANL_LIBM= ;;
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esac
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else
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gl_func_isnanl=no
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fi
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if test $gl_func_isnanl != yes; then
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HAVE_ISNANL=0
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fi
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AC_SUBST([ISNANL_LIBM])
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])
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AC_DEFUN([gl_FUNC_ISNANL_NO_LIBM],
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[
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gl_HAVE_ISNANL_NO_LIBM
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gl_func_isnanl_no_libm=$gl_cv_func_isnanl_no_libm
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if test $gl_func_isnanl_no_libm = yes; then
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gl_FUNC_ISNANL_WORKS
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case "$gl_cv_func_isnanl_works" in
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*yes) ;;
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*) gl_func_isnanl_no_libm=no ;;
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esac
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fi
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if test $gl_func_isnanl_no_libm = yes; then
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AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1],
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[Define if the isnan(long double) function is available in libc.])
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fi
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])
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dnl Prerequisites of replacement isnanl definition. It does not need -lm.
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AC_DEFUN([gl_PREREQ_ISNANL],
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[
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gl_LONG_DOUBLE_EXPONENT_LOCATION
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AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
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])
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dnl Test whether isnanl() can be used without libm.
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AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM],
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[
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AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm],
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[gl_cv_func_isnanl_no_libm],
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[
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <math.h>
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#if (__GNUC__ >= 4) || (__clang_major__ >= 4)
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# undef isnanl
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# define isnanl(x) __builtin_isnan ((long double)(x))
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#elif defined isnan
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# undef isnanl
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# define isnanl(x) isnan ((long double)(x))
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#endif
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long double x;]],
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[[return isnanl (x);]])],
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[gl_cv_func_isnanl_no_libm=yes],
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[gl_cv_func_isnanl_no_libm=no])
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])
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])
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dnl Test whether isnanl() can be used with libm.
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AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM],
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[
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AC_CACHE_CHECK([whether isnan(long double) can be used with libm],
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[gl_cv_func_isnanl_in_libm],
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[
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save_LIBS="$LIBS"
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LIBS="$LIBS -lm"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <math.h>
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#if (__GNUC__ >= 4) || (__clang_major__ >= 4)
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# undef isnanl
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# define isnanl(x) __builtin_isnan ((long double)(x))
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#elif defined isnan
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# undef isnanl
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# define isnanl(x) isnan ((long double)(x))
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#endif
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long double x;]],
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[[return isnanl (x);]])],
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[gl_cv_func_isnanl_in_libm=yes],
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[gl_cv_func_isnanl_in_libm=no])
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LIBS="$save_LIBS"
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])
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])
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dnl Test whether isnanl() recognizes all canonical numbers which are neither
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dnl finite nor infinite.
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AC_DEFUN([gl_FUNC_ISNANL_WORKS],
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([gl_BIGENDIAN])
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AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether isnanl works], [gl_cv_func_isnanl_works],
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[
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#include <float.h>
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#include <limits.h>
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#include <math.h>
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#if (__GNUC__ >= 4) || (__clang_major__ >= 4)
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# undef isnanl
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# define isnanl(x) __builtin_isnan ((long double)(x))
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#elif defined isnan
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# undef isnanl
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# define isnanl(x) isnan ((long double)(x))
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#endif
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#define NWORDS \
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((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
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typedef union { unsigned int word[NWORDS]; long double value; }
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memory_long_double;
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/* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the
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runtime type conversion. */
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#ifdef __sgi
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static long double NaNl ()
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{
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double zero = 0.0;
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return zero / zero;
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}
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#else
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# define NaNl() (0.0L / 0.0L)
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#endif
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int main ()
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{
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int result = 0;
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if (!isnanl (NaNl ()))
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result |= 1;
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{
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memory_long_double m;
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unsigned int i;
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/* The isnanl function should be immune against changes in the sign bit and
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in the mantissa bits. The xor operation twiddles a bit that can only be
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a sign bit or a mantissa bit (since the exponent never extends to
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bit 31). */
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m.value = NaNl ();
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m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
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for (i = 0; i < NWORDS; i++)
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m.word[i] |= 1;
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if (!isnanl (m.value))
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result |= 1;
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}
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#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
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/* Representation of an 80-bit 'long double' as an initializer for a sequence
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of 'unsigned int' words. */
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# ifdef WORDS_BIGENDIAN
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# define LDBL80_WORDS(exponent,manthi,mantlo) \
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{ ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
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((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16), \
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(unsigned int) (mantlo) << 16 \
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}
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# else
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# define LDBL80_WORDS(exponent,manthi,mantlo) \
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{ mantlo, manthi, exponent }
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# endif
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{ /* Quiet NaN. */
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static memory_long_double x =
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{ LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
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if (!isnanl (x.value))
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result |= 2;
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}
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{
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/* Signalling NaN. */
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static memory_long_double x =
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{ LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
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if (!isnanl (x.value))
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result |= 2;
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}
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/* isnanl should return something even for noncanonical values. */
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{ /* Pseudo-NaN. */
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static memory_long_double x =
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{ LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
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if (isnanl (x.value) && !isnanl (x.value))
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result |= 4;
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}
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{ /* Pseudo-Infinity. */
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static memory_long_double x =
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{ LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
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if (isnanl (x.value) && !isnanl (x.value))
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result |= 8;
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}
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{ /* Pseudo-Zero. */
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static memory_long_double x =
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{ LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
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if (isnanl (x.value) && !isnanl (x.value))
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result |= 16;
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}
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{ /* Unnormalized number. */
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static memory_long_double x =
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{ LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
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if (isnanl (x.value) && !isnanl (x.value))
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result |= 32;
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}
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{ /* Pseudo-Denormal. */
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static memory_long_double x =
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{ LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
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if (isnanl (x.value) && !isnanl (x.value))
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result |= 64;
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}
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#endif
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return result;
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}]])],
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[gl_cv_func_isnanl_works=yes],
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[gl_cv_func_isnanl_works=no],
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[case "$host_os" in
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mingw*) # Guess yes on mingw, no on MSVC.
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AC_EGREP_CPP([Known], [
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#ifdef __MINGW32__
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Known
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#endif
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],
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[gl_cv_func_isnanl_works="guessing yes"],
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[gl_cv_func_isnanl_works="guessing no"])
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;;
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*) gl_cv_func_isnanl_works="guessing yes" ;;
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esac
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])
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])
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])
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