Imported Upstream version 0.9.6+really0.9.3upstream/0.9.6+really0.9.3

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
+      ])
     ])
 ])