Imported gcc-4.4.3

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

diff --git a/gmp/mpf/mul.c b/gmp/mpf/mul.c
new file mode 100644 (file)
index 0000000..d4d9143
--- /dev/null
+++ b/gmp/mpf/mul.c
@@ -0,0 +1,85 @@
+/* mpf_mul -- Multiply two floats.
+
+Copyright 1993, 1994, 1996, 2001, 2005 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"
+
+void
+mpf_mul (mpf_ptr r, mpf_srcptr u, mpf_srcptr v)
+{
+  mp_srcptr up, vp;
+  mp_size_t usize, vsize;
+  mp_size_t sign_product;
+  mp_size_t prec = r->_mp_prec;
+  TMP_DECL;
+
+  TMP_MARK;
+  usize = u->_mp_size;
+  vsize = v->_mp_size;
+  sign_product = usize ^ vsize;
+
+  usize = ABS (usize);
+  vsize = ABS (vsize);
+
+  up = u->_mp_d;
+  vp = v->_mp_d;
+  if (usize > prec)
+    {
+      up += usize - prec;
+      usize = prec;
+    }
+  if (vsize > prec)
+    {
+      vp += vsize - prec;
+      vsize = prec;
+    }
+
+  if (usize == 0 || vsize == 0)
+    {
+      r->_mp_size = 0;
+      r->_mp_exp = 0;          /* ??? */
+    }
+  else
+    {
+      mp_size_t rsize;
+      mp_limb_t cy_limb;
+      mp_ptr rp, tp;
+      mp_size_t adj;
+
+      rsize = usize + vsize;
+      tp = (mp_ptr) TMP_ALLOC (rsize * BYTES_PER_MP_LIMB);
+      cy_limb = (usize >= vsize
+                ? mpn_mul (tp, up, usize, vp, vsize)
+                : mpn_mul (tp, vp, vsize, up, usize));
+
+      adj = cy_limb == 0;
+      rsize -= adj;
+      prec++;
+      if (rsize > prec)
+       {
+         tp += rsize - prec;
+         rsize = prec;
+       }
+      rp = r->_mp_d;
+      MPN_COPY (rp, tp, rsize);
+      r->_mp_exp = u->_mp_exp + v->_mp_exp - adj;
+      r->_mp_size = sign_product >= 0 ? rsize : -rsize;
+    }
+  TMP_FREE;
+}