diff options
Diffstat (limited to 'gnulib-m4/isnanl.m4')
| -rw-r--r-- | gnulib-m4/isnanl.m4 | 153 |
1 files changed, 81 insertions, 72 deletions
diff --git a/gnulib-m4/isnanl.m4 b/gnulib-m4/isnanl.m4 index b86ca9e..25daeca 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 + ]) ]) ]) |