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authorManuel A. Fernandez Montecelo <manuel.montezelo@gmail.com>2016-05-27 14:28:30 +0100
committerManuel A. Fernandez Montecelo <manuel.montezelo@gmail.com>2016-05-27 14:28:30 +0100
commita9a31b1de5776a3b08a82101a4fa711294f0dd1d (patch)
tree159134a624e51509f40ed8823249f09a70d1dda3 /gnulib-m4/isnanl.m4
parent5f2b09982312c98863eb9a8dfe2c608b81f58259 (diff)
Imported Upstream version 0.9.6+really0.9.3upstream/0.9.6+really0.9.3
Diffstat (limited to 'gnulib-m4/isnanl.m4')
-rw-r--r--gnulib-m4/isnanl.m4153
1 files changed, 81 insertions, 72 deletions
diff --git a/gnulib-m4/isnanl.m4 b/gnulib-m4/isnanl.m4
index b86ca9ef..25daecae 100644
--- a/gnulib-m4/isnanl.m4
+++ b/gnulib-m4/isnanl.m4
@@ -1,5 +1,5 @@
-# isnanl.m4 serial 19
-dnl Copyright (C) 2007-2015 Free Software Foundation, Inc.
+# 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.
@@ -15,7 +15,6 @@ AC_DEFUN([gl_FUNC_ISNANL],
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"
@@ -31,6 +30,7 @@ AC_DEFUN([gl_FUNC_ISNANL],
fi
if test $gl_func_isnanl != yes; then
HAVE_ISNANL=0
+ gl_BUILD_ISNANL
fi
AC_SUBST([ISNANL_LIBM])
])
@@ -49,14 +49,16 @@ AC_DEFUN([gl_FUNC_ISNANL_NO_LIBM],
if test $gl_func_isnanl_no_libm = yes; then
AC_DEFINE([HAVE_ISNANL_IN_LIBC], [1],
[Define if the isnan(long double) function is available in libc.])
+ else
+ gl_BUILD_ISNANL
fi
])
-dnl Prerequisites of replacement isnanl definition. It does not need -lm.
-AC_DEFUN([gl_PREREQ_ISNANL],
+dnl Pull in replacement isnanl definition. It does not need -lm.
+AC_DEFUN([gl_BUILD_ISNANL],
[
+ AC_LIBOBJ([isnanl])
gl_LONG_DOUBLE_EXPONENT_LOCATION
- AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
])
dnl Test whether isnanl() can be used without libm.
@@ -65,18 +67,16 @@ AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM],
AC_CACHE_CHECK([whether isnan(long double) can be used without linking with libm],
[gl_cv_func_isnanl_no_libm],
[
- AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <math.h>
- #if __GNUC__ >= 4
- # undef isnanl
- # define isnanl(x) __builtin_isnanl ((long double)(x))
- #elif defined isnan
- # undef isnanl
- # define isnanl(x) isnan ((long double)(x))
- #endif
- long double x;]],
- [[return isnanl (x);]])],
+ AC_TRY_LINK([#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnanl
+ # define isnanl(x) __builtin_isnanl ((long double)(x))
+ #elif defined isnan
+ # undef isnanl
+ # define isnanl(x) isnan ((long double)(x))
+ #endif
+ long double x;],
+ [return isnanl (x);],
[gl_cv_func_isnanl_no_libm=yes],
[gl_cv_func_isnanl_no_libm=no])
])
@@ -90,36 +90,35 @@ AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM],
[
save_LIBS="$LIBS"
LIBS="$LIBS -lm"
- AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <math.h>
- #if __GNUC__ >= 4
- # undef isnanl
- # define isnanl(x) __builtin_isnanl ((long double)(x))
- #elif defined isnan
- # undef isnanl
- # define isnanl(x) isnan ((long double)(x))
- #endif
- long double x;]],
- [[return isnanl (x);]])],
+ AC_TRY_LINK([#include <math.h>
+ #if __GNUC__ >= 4
+ # undef isnanl
+ # define isnanl(x) __builtin_isnanl ((long double)(x))
+ #elif defined isnan
+ # undef isnanl
+ # define isnanl(x) isnan ((long double)(x))
+ #endif
+ long double x;],
+ [return isnanl (x);],
[gl_cv_func_isnanl_in_libm=yes],
[gl_cv_func_isnanl_in_libm=no])
LIBS="$save_LIBS"
])
])
-dnl Test whether isnanl() recognizes all canonical numbers which are neither
-dnl finite nor infinite.
+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([[
+ AC_TRY_RUN([
#include <float.h>
#include <limits.h>
#include <math.h>
@@ -147,34 +146,30 @@ static long double NaNl ()
#endif
int main ()
{
- int result = 0;
+ memory_long_double m;
+ unsigned int i;
if (!isnanl (NaNl ()))
- result |= 1;
+ return 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))
+ 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))
- 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
+#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) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
(unsigned int) (mantlo) << 16 \
}
# else
@@ -185,52 +180,66 @@ int main ()
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
if (!isnanl (x.value))
- result |= 2;
+ return 1;
}
{
/* Signalling NaN. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
if (!isnanl (x.value))
- result |= 2;
+ return 1;
}
- /* isnanl should return something even for noncanonical values. */
+ /* 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) && !isnanl (x.value))
- result |= 4;
+ if (!isnanl (x.value))
+ return 1;
}
{ /* Pseudo-Infinity. */
static memory_long_double x =
{ LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
- if (isnanl (x.value) && !isnanl (x.value))
- result |= 8;
+ if (!isnanl (x.value))
+ return 1;
}
{ /* Pseudo-Zero. */
static memory_long_double x =
{ LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
- if (isnanl (x.value) && !isnanl (x.value))
- result |= 16;
+ if (!isnanl (x.value))
+ return 1;
}
{ /* Unnormalized number. */
static memory_long_double x =
{ LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
- if (isnanl (x.value) && !isnanl (x.value))
- result |= 32;
+ if (!isnanl (x.value))
+ return 1;
}
{ /* Pseudo-Denormal. */
static memory_long_double x =
{ LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
- if (isnanl (x.value) && !isnanl (x.value))
- result |= 64;
+ if (!isnanl (x.value))
+ return 1;
}
#endif
- return result;
-}]])],
- [gl_cv_func_isnanl_works=yes],
- [gl_cv_func_isnanl_works=no],
- [gl_cv_func_isnanl_works="guessing yes"])
+ 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
+ ])
])
])