Mercurial > hg > octave-lyh > gnulib-hg
changeset 9648:b0279d822a0e
Make use of GCC's __builtin_isnan.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 26 Jan 2008 15:37:59 +0100 |
parents | 56547f123073 |
children | 62b023b56d7d |
files | ChangeLog lib/isnand.h m4/isnand.m4 |
diffstat | 3 files changed, 19 insertions(+), 3 deletions(-) [+] |
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--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2008-01-26 Bruno Haible <bruno@clisp.org> + + * m4/isnand.m4 (gl_FUNC_ISNAND_NO_LIBM): Test the GCC >= 4.0 built-in. + * lib/isnand.h (isnand): Use the GCC >= 4.0 built-in. + 2008-01-26 Bruno Haible <bruno@clisp.org> * m4/isnanf.m4 (gl_HAVE_ISNANF_NO_LIBM, gl_ISNANF_WORKS): Test the
--- a/lib/isnand.h +++ b/lib/isnand.h @@ -17,7 +17,11 @@ #if HAVE_ISNAND_IN_LIBC /* Get declaration of isnan macro. */ # include <math.h> -# ifdef isnan +# if __GNUC__ >= 4 + /* GCC 4.0 and newer provides three built-ins for isnan. */ +# undef isnand +# define isnand(x) __builtin_isnan ((double)(x)) +# else # undef isnand # define isnand(x) isnan ((double)(x)) # endif
--- a/m4/isnand.m4 +++ b/m4/isnand.m4 @@ -1,4 +1,4 @@ -# isnand.m4 serial 1 +# isnand.m4 serial 2 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, @@ -12,8 +12,15 @@ [gl_cv_func_isnand_no_libm], [ AC_TRY_LINK([#include <math.h> + #if __GNUC__ >= 4 + # undef isnand + # define isnand(x) __builtin_isnan ((double)(x)) + #else + # undef isnand + # define isnand(x) isnan ((double)(x)) + #endif double x;], - [return isnan (x);], + [return isnand (x);], [gl_cv_func_isnand_no_libm=yes], [gl_cv_func_isnand_no_libm=no]) ])