Initial revision

1 files changed, 59 insertions, 0 deletions

diff --git a/mpf/neg.c b/mpf/neg.c
new file mode 100644
index 000000000..a4139fb90
--- /dev/null
+++ b/mpf/neg.c
@@ -0,0 +1,59 @@
+/* mpf_neg -- Negate a float.
+
+Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Library General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at your
+option) any later version.
+
+The GNU MP Library 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#if __STDC__
+mpf_neg (mpf_ptr r, mpf_srcptr u)
+#else
+mpf_neg (r, u)
+     mpf_ptr r;
+     mpf_srcptr u;
+#endif
+{
+  mp_size_t size;
+
+  size = -u->_mp_size;
+  if (r != u)
+    {
+      mp_size_t prec;
+      mp_size_t asize;
+      mp_ptr rp, up;
+
+      prec = r->_mp_prec + 1;	/* lie not to lose precision in assignment */
+      asize = ABS (size);
+      rp = r->_mp_d;
+      up = u->_mp_d;
+
+      if (asize > prec)
+	{
+	  up += asize - prec;
+	  asize = prec;
+	}
+
+      MPN_COPY (rp, up, asize);
+      r->_mp_exp = u->_mp_exp;
+      size = size >= 0 ? asize : -asize;
+    }
+  r->_mp_size = size;
+}