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Diffstat (limited to 'libgfortran/m4/rrspacing.m4')
-rw-r--r-- | libgfortran/m4/rrspacing.m4 | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/libgfortran/m4/rrspacing.m4 b/libgfortran/m4/rrspacing.m4 new file mode 100644 index 000000000..5f11d5b6b --- /dev/null +++ b/libgfortran/m4/rrspacing.m4 @@ -0,0 +1,54 @@ +`/* Implementation of the RRSPACING intrinsic + Copyright 2006, 2007, 2009, 2010 Free Software Foundation, Inc. + Contributed by Steven G. Kargl <kargl@gcc.gnu.org> + +This file is part of the GNU Fortran 95 runtime library (libgfortran). + +Libgfortran 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. + +Libgfortran 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. + +Under Section 7 of GPL version 3, you are granted additional +permissions described in the GCC Runtime Library Exception, version +3.1, as published by the Free Software Foundation. + +You should have received a copy of the GNU General Public License and +a copy of the GCC Runtime Library Exception along with this program; +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +<http://www.gnu.org/licenses/>. */ + +#include "libgfortran.h"' + +include(`mtype.m4')dnl + +mathfunc_macro + +`#if defined (HAVE_'real_type`) && 'hasmathfunc(fabs) && hasmathfunc(frexp)` + +extern 'real_type` rrspacing_r'kind` ('real_type` s, int p); +export_proto(rrspacing_r'kind`); + +'real_type` +rrspacing_r'kind` ('real_type` s, int p) +{ + int e; + 'real_type` x; + x = MATHFUNC(fabs) (s); + if (x == 0.) + return 0.; + MATHFUNC(frexp) (s, &e); +#if 'hasmathfunc(ldexp)` + return MATHFUNC(ldexp) (x, p - e); +#else + return MATHFUNC(scalbn) (x, p - e); +#endif + +} + +#endif' |