Mercurial > hg > octave-lyh > gnulib-hg
changeset 9649:62b023b56d7d
Use the GCC built-in __builtin_isnanl (if it works).
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 26 Jan 2008 15:45:42 +0100 |
parents | b0279d822a0e |
children | 6cd357b36fe3 |
files | ChangeLog lib/isnanl-nolibm.h lib/isnanl.h m4/isnanl.m4 |
diffstat | 4 files changed, 36 insertions(+), 9 deletions(-) [+] |
line wrap: on
line diff
--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2008-01-26 Bruno Haible <bruno@clisp.org> + + * m4/isnanl.m4 (gl_HAVE_ISNANL_NO_LIBM, gl_HAVE_ISNANL_IN_LIBM, + gl_FUNC_ISNANL_WORKS): Test the GCC >= 4.0 built-in. + * lib/isnanl.h (isnanl): Use the GCC >= 4.0 built-in. + * lib/isnanl-nolibm.h (isnanl): Likewise. + 2008-01-26 Bruno Haible <bruno@clisp.org> * m4/isnand.m4 (gl_FUNC_ISNAND_NO_LIBM): Test the GCC >= 4.0 built-in.
--- a/lib/isnanl-nolibm.h +++ b/lib/isnanl-nolibm.h @@ -1,5 +1,5 @@ /* Test for NaN that does not need libm. - Copyright (C) 2007 Free Software Foundation, Inc. + 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 @@ -17,7 +17,11 @@ #if HAVE_ISNANL_IN_LIBC /* Get declaration of isnan macro or (older) isnanl function. */ # include <math.h> -# ifdef isnan +# if __GNUC__ >= 4 + /* GCC 4.0 and newer provides three built-ins for isnan. */ +# undef isnanl +# define isnanl(x) __builtin_isnanl ((long double)(x)) +# elif defined isnan # undef isnanl # define isnanl(x) isnan ((long double)(x)) # endif
--- a/lib/isnanl.h +++ b/lib/isnanl.h @@ -1,5 +1,5 @@ /* Test for NaN. - Copyright (C) 2007 Free Software Foundation, Inc. + 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 @@ -17,7 +17,11 @@ #if HAVE_ISNANL /* Get declaration of isnan macro or (older) isnanl function. */ # include <math.h> -# ifdef isnan +# if __GNUC__ >= 4 + /* GCC 4.0 and newer provides three built-ins for isnan. */ +# undef isnanl +# define isnanl(x) __builtin_isnanl ((long double)(x)) +# elif defined isnan # undef isnanl # define isnanl(x) isnan ((long double)(x)) # endif
--- a/m4/isnanl.m4 +++ b/m4/isnanl.m4 @@ -1,5 +1,5 @@ -# isnanl.m4 serial 5 -dnl Copyright (C) 2007 Free Software Foundation, Inc. +# isnanl.m4 serial 6 +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. @@ -64,7 +64,10 @@ [gl_cv_func_isnanl_no_libm], [ AC_TRY_LINK([#include <math.h> - #ifdef isnan + #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 @@ -84,7 +87,10 @@ save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_TRY_LINK([#include <math.h> - #ifdef isnan + #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 @@ -98,6 +104,9 @@ 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]) @@ -109,7 +118,10 @@ #include <float.h> #include <limits.h> #include <math.h> -#ifdef isnan +#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