--- /dev/null
+# isinf.m4 serial 1
+dnl Copyright (C) 2007-2008 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_ISINF],
+[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ dnl Persuade glibc <math.h> to declare isinf.
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_DECLS([isinf], , , [#include <math.h>])
+ if test "$ac_cv_have_decl_isinf" = yes; then
+ gl_CHECK_MATH_LIB([ISINF_LIBM], [x = isinf (x);])
+ if test "$ISINF_LIBM" != missing; then
+ dnl Test whether isinf() on 'long double' works.
+ gl_ISINFL_WORKS
+ case "$gl_cv_func_isinfl_works" in
+ *yes) ;;
+ *) ISINF_LIBM=missing;;
+ esac
+ fi
+ fi
+ if test "$ac_cv_have_decl_isinf" != yes ||
+ test "$ISINF_LIBM" = missing; then
+ REPLACE_ISINF=1
+ AC_LIBOBJ([isinf])
+ ISINF_LIBM=
+ fi
+ AC_SUBST([REPLACE_ISINF])
+ AC_SUBST([ISINF_LIBM])
+])
+
+dnl Test whether isinf() correctly returns false for LDBL_MAX.
+AC_DEFUN([gl_ISINFL_WORKS],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_C_BIGENDIAN])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether isinf(long double) works], [gl_cv_func_isinfl_works],
+ [
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <float.h>
+ #include <math.h>]],
+ [[return !!isinf(LDBL_MAX);]])],
+ [gl_cv_func_isinfl_works=yes],
+ [gl_cv_func_isinfl_works=no],
+ [gl_cv_func_isinfl_works="guessing no"])
+ ])
+])
--- /dev/null
+/* Test of isinf() substitute.
+ Copyright (C) 2007-2008 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Ben Pfaff, 2008, using Bruno Haible's code as a
+ template. */
+
+#include <config.h>
+
+#include <float.h>
+#include <limits.h>
+#include <math.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+ fflush (stderr); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+float zerof = 0.0f;
+double zerod = 0.0;
+long double zerol = 0.0L;
+
+static void
+test_isinff ()
+{
+ /* Zero. */
+ ASSERT (!isinf (0.0f));
+ /* Subnormal values. */
+ ASSERT (!isinf (FLT_MIN / 2));
+ ASSERT (!isinf (-FLT_MIN / 2));
+ /* Finite values. */
+ ASSERT (!isinf (3.141f));
+ ASSERT (!isinf (3.141e30f));
+ ASSERT (!isinf (3.141e-30f));
+ ASSERT (!isinf (-2.718f));
+ ASSERT (!isinf (-2.718e30f));
+ ASSERT (!isinf (-2.718e-30f));
+ ASSERT (!isinf (FLT_MAX));
+ ASSERT (!isinf (-FLT_MAX));
+ /* Infinite values. */
+ ASSERT (isinf (1.0f / 0.0f));
+ ASSERT (isinf (-1.0f / 0.0f));
+ /* Quiet NaN. */
+ ASSERT (!isinf (zerof / zerof));
+#if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
+ /* Signalling NaN. */
+ {
+ #define NWORDS \
+ ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { float value; unsigned int word[NWORDS]; } memory_float;
+ memory_float m;
+ m.value = zerof / zerof;
+# if FLT_EXPBIT0_BIT > 0
+ m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
+# else
+ m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+ if (FLT_EXPBIT0_WORD < NWORDS / 2)
+ m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
+ else
+ m.word[0] |= (unsigned int) 1;
+ ASSERT (!isinf (m.value));
+ #undef NWORDS
+ }
+#endif
+}
+
+static void
+test_isinfd ()
+{
+ /* Zero. */
+ ASSERT (!isinf (0.0));
+ /* Subnormal values. */
+ ASSERT (!isinf (DBL_MIN / 2));
+ ASSERT (!isinf (-DBL_MIN / 2));
+ /* Finite values. */
+ ASSERT (!isinf (3.141));
+ ASSERT (!isinf (3.141e30));
+ ASSERT (!isinf (3.141e-30));
+ ASSERT (!isinf (-2.718));
+ ASSERT (!isinf (-2.718e30));
+ ASSERT (!isinf (-2.718e-30));
+ ASSERT (!isinf (DBL_MAX));
+ ASSERT (!isinf (-DBL_MAX));
+ /* Infinite values. */
+ ASSERT (isinf (1.0 / 0.0));
+ ASSERT (isinf (-1.0 / 0.0));
+ /* Quiet NaN. */
+ ASSERT (!isinf (zerod / zerod));
+#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
+ /* Signalling NaN. */
+ {
+ #define NWORDS \
+ ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { double value; unsigned int word[NWORDS]; } memory_double;
+ memory_double m;
+ m.value = zerod / zerod;
+# if DBL_EXPBIT0_BIT > 0
+ m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
+# else
+ m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+ m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
+ ASSERT (!isinf (m.value));
+ #undef NWORDS
+ }
+#endif
+}
+
+static void
+test_isinfl ()
+{
+ #define NWORDS \
+ ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { unsigned int word[NWORDS]; long double value; }
+ memory_long_double;
+
+ /* Zero. */
+ ASSERT (!isinf (0.0L));
+ /* Subnormal values. */
+ ASSERT (!isinf (LDBL_MIN / 2));
+ ASSERT (!isinf (-LDBL_MIN / 2));
+ /* Finite values. */
+ ASSERT (!isinf (3.141L));
+ ASSERT (!isinf (3.141e30L));
+ ASSERT (!isinf (3.141e-30L));
+ ASSERT (!isinf (-2.718L));
+ ASSERT (!isinf (-2.718e30L));
+ ASSERT (!isinf (-2.718e-30L));
+ ASSERT (!isinf (LDBL_MAX));
+ ASSERT (!isinf (-LDBL_MAX));
+ /* Infinite values. */
+ ASSERT (isinf (1.0L / 0.0L));
+ ASSERT (isinf (-1.0L / 0.0L));
+ /* Quiet NaN. */
+ ASSERT (!isinf (zerol / zerol));
+
+#if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
+ /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
+ it's a Signalling NaN. */
+ {
+ memory_long_double m;
+ m.value = zerol / zerol;
+# if LDBL_EXPBIT0_BIT > 0
+ m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
+# else
+ m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+ m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
+ ASSERT (!isinf (m.value));
+ }
+#endif
+
+#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) };
+ ASSERT (!isinf (x.value));
+ }
+ {
+ /* Signalling NaN. */
+ static memory_long_double x =
+ { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
+ ASSERT (!isinf (x.value));
+ }
+ /* 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) };
+ ASSERT (!isinf (x.value));
+ }
+ { /* Pseudo-Infinity. */
+ static memory_long_double x =
+ { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
+ ASSERT (!isinf (x.value));
+ }
+ { /* Pseudo-Zero. */
+ static memory_long_double x =
+ { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
+ ASSERT (!isinf (x.value));
+ }
+ { /* Unnormalized number. */
+ static memory_long_double x =
+ { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
+ ASSERT (!isinf (x.value));
+ }
+ { /* Pseudo-Denormal. */
+ static memory_long_double x =
+ { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
+ ASSERT (!isinf (x.value));
+ }
+#endif
+
+ #undef NWORDS
+}
+
+int
+main ()
+{
+ test_isinff ();
+ test_isinfd ();
+ test_isinfl ();
+ return 0;
+}
projects / pspp / commitdiff