Imported gcc-4.4.3

[msp430-gcc.git] / mpfr / cmp.c

diff --git a/mpfr/cmp.c b/mpfr/cmp.c
new file mode 100644 (file)
index 0000000..61df832
--- /dev/null
+++ b/mpfr/cmp.c
@@ -0,0 +1,104 @@
+/* mpfr_cmp -- compare two floating-point numbers
+
+Copyright 1999, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include "mpfr-impl.h"
+
+/* returns 0 iff b = sign(s) * c
+           a positive value iff b > sign(s) * c
+           a negative value iff b < sign(s) * c
+   returns 0 and sets erange flag if b and/or c is NaN.
+*/
+
+int
+mpfr_cmp3 (mpfr_srcptr b, mpfr_srcptr c, int s)
+{
+  mp_exp_t be, ce;
+  mp_size_t bn, cn;
+  mp_limb_t *bp, *cp;
+
+  s = MPFR_MULT_SIGN( s , MPFR_SIGN(c) );
+
+  if (MPFR_ARE_SINGULAR(b, c))
+    {
+      if (MPFR_IS_NAN (b) || MPFR_IS_NAN (c))
+        {
+          MPFR_SET_ERANGE ();
+          return 0;
+        }
+      else if (MPFR_IS_INF(b))
+        {
+          if (MPFR_IS_INF(c) && s == MPFR_SIGN(b) )
+            return 0;
+          else
+            return MPFR_SIGN(b);
+        }
+      else if (MPFR_IS_INF(c))
+        return -s;
+      else if (MPFR_IS_ZERO(b))
+        return MPFR_IS_ZERO(c) ? 0 : -s;
+      else /* necessarily c=0 */
+        return MPFR_SIGN(b);
+    }
+  /* b and c are real numbers */
+  if (s != MPFR_SIGN(b))
+    return MPFR_SIGN(b);
+
+  /* now signs are equal */
+
+  be = MPFR_GET_EXP (b);
+  ce = MPFR_GET_EXP (c);
+  if (be > ce)
+    return s;
+  if (be < ce)
+    return -s;
+
+  /* both signs and exponents are equal */
+
+  bn = (MPFR_PREC(b)-1)/BITS_PER_MP_LIMB;
+  cn = (MPFR_PREC(c)-1)/BITS_PER_MP_LIMB;
+
+  bp = MPFR_MANT(b);
+  cp = MPFR_MANT(c);
+
+  for ( ; bn >= 0 && cn >= 0; bn--, cn--)
+    {
+      if (bp[bn] > cp[cn])
+        return s;
+      if (bp[bn] < cp[cn])
+        return -s;
+    }
+  for ( ; bn >= 0; bn--)
+    if (bp[bn])
+      return s;
+  for ( ; cn >= 0; cn--)
+    if (cp[cn])
+      return -s;
+
+   return 0;
+}
+
+#undef mpfr_cmp
+int
+mpfr_cmp (mpfr_srcptr b, mpfr_srcptr c)
+{
+  return mpfr_cmp3 (b, c, 1);
+}