Imported gcc-4.4.3

[msp430-gcc.git] / gmp / mpf / cmp.c

diff --git a/gmp/mpf/cmp.c b/gmp/mpf/cmp.c
new file mode 100644 (file)
index 0000000..fc29309
--- /dev/null
+++ b/gmp/mpf/cmp.c
@@ -0,0 +1,106 @@
+/* mpf_cmp -- Compare two floats.
+
+Copyright 1993, 1994, 1996, 2001 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 Lesser General Public License as published by
+the Free Software Foundation; either version 3 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+int
+mpf_cmp (mpf_srcptr u, mpf_srcptr v)
+{
+  mp_srcptr up, vp;
+  mp_size_t usize, vsize;
+  mp_exp_t uexp, vexp;
+  int cmp;
+  int usign;
+
+  uexp = u->_mp_exp;
+  vexp = v->_mp_exp;
+
+  usize = u->_mp_size;
+  vsize = v->_mp_size;
+
+  /* 1. Are the signs different?  */
+  if ((usize ^ vsize) >= 0)
+    {
+      /* U and V are both non-negative or both negative.  */
+      if (usize == 0)
+       /* vsize >= 0 */
+       return -(vsize != 0);
+      if (vsize == 0)
+       /* usize >= 0 */
+       return usize != 0;
+      /* Fall out.  */
+    }
+  else
+    {
+      /* Either U or V is negative, but not both.  */
+      return usize >= 0 ? 1 : -1;
+    }
+
+  /* U and V have the same sign and are both non-zero.  */
+
+  usign = usize >= 0 ? 1 : -1;
+
+  /* 2. Are the exponents different?  */
+  if (uexp > vexp)
+    return usign;
+  if (uexp < vexp)
+    return -usign;
+
+  usize = ABS (usize);
+  vsize = ABS (vsize);
+
+  up = u->_mp_d;
+  vp = v->_mp_d;
+
+#define STRICT_MPF_NORMALIZATION 0
+#if ! STRICT_MPF_NORMALIZATION
+  /* Ignore zeroes at the low end of U and V.  */
+  while (up[0] == 0)
+    {
+      up++;
+      usize--;
+    }
+  while (vp[0] == 0)
+    {
+      vp++;
+      vsize--;
+    }
+#endif
+
+  if (usize > vsize)
+    {
+      cmp = mpn_cmp (up + usize - vsize, vp, vsize);
+      if (cmp == 0)
+       return usign;
+    }
+  else if (vsize > usize)
+    {
+      cmp = mpn_cmp (up, vp + vsize - usize, usize);
+      if (cmp == 0)
+       return -usign;
+    }
+  else
+    {
+      cmp = mpn_cmp (up, vp, usize);
+      if (cmp == 0)
+       return 0;
+    }
+  return cmp > 0 ? usign : -usign;
+}