1 files changed, 58 insertions, 0 deletions
diff --git a/mpfr/mpfr-impl.h b/mpfr/mpfr-impl.h
new file mode 100644
index 000000000..3464febb1
--- /dev/null
+++ b/mpfr/mpfr-impl.h
@@ -0,0 +1,58 @@
+/* Utilities for MPFR developers, not exported.
+
+Copyright (C) 1999 PolKA project, Inria Lorraine and Loria
+
+This file is part of the MPFR Library.
+
+The MPFR 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 MPFR 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 MPFR 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 <math.h>
+
+/* generate a random double using the whole range of possible values,
+   including denormalized numbers, NaN, infinities, ... */
+double drand()
+{
+  volatile double d; int *i;
+
+  i = (int*) &d;
+  i[0] = mrand48();
+  i[1] = mrand48();
+  return d;
+}
+
+/* returns the number of ulp's between a and b */
+int ulp(a,b) double a,b;
+{
+  double eps=1.1102230246251565404e-16; /* 2^(-53) */
+  if (a==0.0) {
+    if (b==0.0) return 0;
+    else if (b<0.0) return 2147483647;
+    else return -2147483647;
+  }
+  b = (a-b)/a;
+  if (b>0)
+    return (int) floor(b/eps);
+  else
+    return (int) ceil(b/eps);
+}
+
+/* return double m*2^e */
+double dbl(m,e) double m; int e;
+{
+  if (e>=0) while (e-->0) m *= 2.0;
+  else while (e++<0) m /= 2.0;
+  return m;
+}