X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fisnanf.m4;h=f01886a683d4f0ba5dd44c2060c70e10eb16ee53;hb=5191b3546cfb6c163228c23f214e325ddf60d46f;hp=24f72fcf1100778b120f45c70a9fcd6f10ff9283;hpb=4ade019ba68356b5d58a94dccff159a1fde85ad5;p=gnulib.git diff --git a/m4/isnanf.m4 b/m4/isnanf.m4 index 24f72fcf1..f01886a68 100644 --- a/m4/isnanf.m4 +++ b/m4/isnanf.m4 @@ -1,5 +1,5 @@ -# isnanf.m4 serial 7 -dnl Copyright (C) 2007-2008 Free Software Foundation, Inc. +# isnanf.m4 serial 14 +dnl Copyright (C) 2007-2013 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. @@ -8,6 +8,7 @@ dnl Check how to get or define isnanf(). AC_DEFUN([gl_FUNC_ISNANF], [ + AC_REQUIRE([gl_MATH_H_DEFAULTS]) ISNANF_LIBM= gl_HAVE_ISNANF_NO_LIBM if test $gl_cv_func_isnanf_no_libm = no; then @@ -16,6 +17,7 @@ AC_DEFUN([gl_FUNC_ISNANF], ISNANF_LIBM=-lm fi fi + dnl The variable gl_func_isnanf set here is used by isnan.m4. if test $gl_cv_func_isnanf_no_libm = yes \ || test $gl_cv_func_isnanf_in_libm = yes; then save_LIBS="$LIBS" @@ -29,11 +31,8 @@ AC_DEFUN([gl_FUNC_ISNANF], else gl_func_isnanf=no fi - if test $gl_func_isnanf = yes; then - AC_DEFINE([HAVE_ISNANF], 1, - [Define if the isnan(float) function is available.]) - else - gl_BUILD_ISNANF + if test $gl_func_isnanf != yes; then + HAVE_ISNANF=0 fi AC_SUBST([ISNANF_LIBM]) ]) @@ -52,17 +51,17 @@ AC_DEFUN([gl_FUNC_ISNANF_NO_LIBM], *) false;; esac }; then - AC_DEFINE([HAVE_ISNANF_IN_LIBC], 1, + gl_func_isnanf_no_libm=yes + AC_DEFINE([HAVE_ISNANF_IN_LIBC], [1], [Define if the isnan(float) function is available in libc.]) else - gl_BUILD_ISNANF + gl_func_isnanf_no_libm=no fi ]) -dnl Pull in replacement isnanf definition. -AC_DEFUN([gl_BUILD_ISNANF], +dnl Prerequisites of replacement isnanf definition. It does not need -lm. +AC_DEFUN([gl_PREREQ_ISNANF], [ - AC_LIBOBJ([isnanf]) gl_FLOAT_EXPONENT_LOCATION ]) @@ -72,16 +71,18 @@ AC_DEFUN([gl_HAVE_ISNANF_NO_LIBM], AC_CACHE_CHECK([whether isnan(float) can be used without linking with libm], [gl_cv_func_isnanf_no_libm], [ - AC_TRY_LINK([#include - #if __GNUC__ >= 4 - # undef isnanf - # define isnanf(x) __builtin_isnanf ((float)(x)) - #elif defined isnan - # undef isnanf - # define isnanf(x) isnan ((float)(x)) - #endif - float x;], - [return isnanf (x);], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include + #if __GNUC__ >= 4 + # undef isnanf + # define isnanf(x) __builtin_isnanf ((float)(x)) + #elif defined isnan + # undef isnanf + # define isnanf(x) isnan ((float)(x)) + #endif + float x;]], + [[return isnanf (x);]])], [gl_cv_func_isnanf_no_libm=yes], [gl_cv_func_isnanf_no_libm=no]) ]) @@ -95,16 +96,18 @@ AC_DEFUN([gl_HAVE_ISNANF_IN_LIBM], [ save_LIBS="$LIBS" LIBS="$LIBS -lm" - AC_TRY_LINK([#include - #if __GNUC__ >= 4 - # undef isnanf - # define isnanf(x) __builtin_isnanf ((float)(x)) - #elif defined isnan - # undef isnanf - # define isnanf(x) isnan ((float)(x)) - #endif - float x;], - [return isnanf (x);], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include + #if __GNUC__ >= 4 + # undef isnanf + # define isnanf(x) __builtin_isnanf ((float)(x)) + #elif defined isnan + # undef isnanf + # define isnanf(x) isnan ((float)(x)) + #endif + float x;]], + [[return isnanf (x);]])], [gl_cv_func_isnanf_in_libm=yes], [gl_cv_func_isnanf_in_libm=no]) LIBS="$save_LIBS" @@ -121,7 +124,8 @@ AC_DEFUN([gl_ISNANF_WORKS], AC_REQUIRE([gl_FLOAT_EXPONENT_LOCATION]) AC_CACHE_CHECK([whether isnan(float) works], [gl_cv_func_isnanf_works], [ - AC_TRY_RUN([ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ #include #if __GNUC__ >= 4 # undef isnanf @@ -146,13 +150,13 @@ NaN () typedef union { unsigned int word[NWORDS]; float value; } memory_float; int main() { - memory_float m; + int result = 0; if (isnanf (1.0f / 0.0f)) - return 1; + result |= 1; if (!isnanf (NaN ())) - return 1; + result |= 2; #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT /* The isnanf function should be immune against changes in the sign bit and @@ -160,17 +164,21 @@ int main() a sign bit or a mantissa bit. */ if (FLT_EXPBIT0_WORD == 0 && FLT_EXPBIT0_BIT > 0) { + memory_float m; + m.value = NaN (); /* Set the bits below the exponent to 01111...111. */ m.word[0] &= -1U << FLT_EXPBIT0_BIT; m.word[0] |= 1U << (FLT_EXPBIT0_BIT - 1) - 1; if (!isnanf (m.value)) - return 1; + result |= 4; } #endif - return 0; -}], [gl_cv_func_isnanf_works=yes], [gl_cv_func_isnanf_works=no], + return result; +}]])], + [gl_cv_func_isnanf_works=yes], + [gl_cv_func_isnanf_works=no], [case "$host_os" in irix* | solaris*) gl_cv_func_isnanf_works="guessing no";; *) gl_cv_func_isnanf_works="guessing yes";; @@ -178,90 +186,3 @@ int main() ]) ]) ]) - -AC_DEFUN([gl_FLOAT_EXPONENT_LOCATION], -[ - AC_CACHE_CHECK([where to find the exponent in a 'float'], - [gl_cv_cc_float_expbit0], - [ - AC_TRY_RUN([ -#include -#include -#include -#include -#define NWORDS \ - ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) -typedef union { float value; unsigned int word[NWORDS]; } memory_float; -static unsigned int ored_words[NWORDS]; -static unsigned int anded_words[NWORDS]; -static void add_to_ored_words (float x) -{ - memory_float m; - size_t i; - /* Clear it first, in case - sizeof (float) < sizeof (memory_float). */ - memset (&m, 0, sizeof (memory_float)); - m.value = x; - for (i = 0; i < NWORDS; i++) - { - ored_words[i] |= m.word[i]; - anded_words[i] &= m.word[i]; - } -} -int main () -{ - size_t j; - FILE *fp = fopen ("conftest.out", "w"); - if (fp == NULL) - return 1; - for (j = 0; j < NWORDS; j++) - anded_words[j] = ~ (unsigned int) 0; - add_to_ored_words (0.25f); - add_to_ored_words (0.5f); - add_to_ored_words (1.0f); - add_to_ored_words (2.0f); - add_to_ored_words (4.0f); - /* Remove bits that are common (e.g. if representation of the first mantissa - bit is explicit). */ - for (j = 0; j < NWORDS; j++) - ored_words[j] &= ~anded_words[j]; - /* Now find the nonzero word. */ - for (j = 0; j < NWORDS; j++) - if (ored_words[j] != 0) - break; - if (j < NWORDS) - { - size_t i; - for (i = j + 1; i < NWORDS; i++) - if (ored_words[i] != 0) - { - fprintf (fp, "unknown"); - return (fclose (fp) != 0); - } - for (i = 0; ; i++) - if ((ored_words[j] >> i) & 1) - { - fprintf (fp, "word %d bit %d", (int) j, (int) i); - return (fclose (fp) != 0); - } - } - fprintf (fp, "unknown"); - return (fclose (fp) != 0); -} - ], - [gl_cv_cc_float_expbit0=`cat conftest.out`], - [gl_cv_cc_float_expbit0="unknown"], - [gl_cv_cc_float_expbit0="word 0 bit 23"]) - rm -f conftest.out - ]) - case "$gl_cv_cc_float_expbit0" in - word*bit*) - word=`echo "$gl_cv_cc_float_expbit0" | sed -e 's/word //' -e 's/ bit.*//'` - bit=`echo "$gl_cv_cc_float_expbit0" | sed -e 's/word.*bit //'` - AC_DEFINE_UNQUOTED([FLT_EXPBIT0_WORD], [$word], - [Define as the word index where to find the exponent of 'float'.]) - AC_DEFINE_UNQUOTED([FLT_EXPBIT0_BIT], [$bit], - [Define as the bit index in the word where to find bit 0 of the exponent of 'float'.]) - ;; - esac -])