Imported gcc-4.4.3

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

diff --git a/gmp/mpz/mul.c b/gmp/mpz/mul.c
new file mode 100644 (file)
index 0000000..7f4e4a3
--- /dev/null
+++ b/gmp/mpz/mul.c
@@ -0,0 +1,145 @@
+/* mpz_mul -- Multiply two integers.
+
+Copyright 1991, 1993, 1994, 1996, 2000, 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 <stdio.h> /* for NULL */
+#include "gmp.h"
+#include "gmp-impl.h"
+#ifdef BERKELEY_MP
+#include "mp.h"
+#endif
+
+
+void
+#ifndef BERKELEY_MP
+mpz_mul (mpz_ptr w, mpz_srcptr u, mpz_srcptr v)
+#else /* BERKELEY_MP */
+mult (mpz_srcptr u, mpz_srcptr v, mpz_ptr w)
+#endif /* BERKELEY_MP */
+{
+  mp_size_t usize = u->_mp_size;
+  mp_size_t vsize = v->_mp_size;
+  mp_size_t wsize;
+  mp_size_t sign_product;
+  mp_ptr up, vp;
+  mp_ptr wp;
+  mp_ptr free_me;
+  size_t free_me_size;
+  mp_limb_t cy_limb;
+  TMP_DECL;
+
+  sign_product = usize ^ vsize;
+  usize = ABS (usize);
+  vsize = ABS (vsize);
+
+  if (usize < vsize)
+    {
+      MPZ_SRCPTR_SWAP (u, v);
+      MP_SIZE_T_SWAP (usize, vsize);
+    }
+
+  if (vsize == 0)
+    {
+      SIZ(w) = 0;
+      return;
+    }
+
+#if HAVE_NATIVE_mpn_mul_2
+  if (vsize <= 2)
+    {
+      MPZ_REALLOC (w, usize+vsize);
+      wp = PTR(w);
+      if (vsize == 1)
+        cy_limb = mpn_mul_1 (wp, PTR(u), usize, PTR(v)[0]);
+      else
+        {
+          cy_limb = mpn_mul_2 (wp, PTR(u), usize, PTR(v));
+          usize++;
+        }
+      wp[usize] = cy_limb;
+      usize += (cy_limb != 0);
+      SIZ(w) = (sign_product >= 0 ? usize : -usize);
+      return;
+    }
+#else
+  if (vsize == 1)
+    {
+      MPZ_REALLOC (w, usize+1);
+      wp = PTR(w);
+      cy_limb = mpn_mul_1 (wp, PTR(u), usize, PTR(v)[0]);
+      wp[usize] = cy_limb;
+      usize += (cy_limb != 0);
+      SIZ(w) = (sign_product >= 0 ? usize : -usize);
+      return;
+    }
+#endif
+
+  TMP_MARK;
+  free_me = NULL;
+  up = u->_mp_d;
+  vp = v->_mp_d;
+  wp = w->_mp_d;
+
+  /* Ensure W has space enough to store the result.  */
+  wsize = usize + vsize;
+  if (w->_mp_alloc < wsize)
+    {
+      if (wp == up || wp == vp)
+       {
+         free_me = wp;
+         free_me_size = w->_mp_alloc;
+       }
+      else
+       (*__gmp_free_func) (wp, w->_mp_alloc * BYTES_PER_MP_LIMB);
+
+      w->_mp_alloc = wsize;
+      wp = (mp_ptr) (*__gmp_allocate_func) (wsize * BYTES_PER_MP_LIMB);
+      w->_mp_d = wp;
+    }
+  else
+    {
+      /* Make U and V not overlap with W.  */
+      if (wp == up)
+       {
+         /* W and U are identical.  Allocate temporary space for U.  */
+         up = (mp_ptr) TMP_ALLOC (usize * BYTES_PER_MP_LIMB);
+         /* Is V identical too?  Keep it identical with U.  */
+         if (wp == vp)
+           vp = up;
+         /* Copy to the temporary space.  */
+         MPN_COPY (up, wp, usize);
+       }
+      else if (wp == vp)
+       {
+         /* W and V are identical.  Allocate temporary space for V.  */
+         vp = (mp_ptr) TMP_ALLOC (vsize * BYTES_PER_MP_LIMB);
+         /* Copy to the temporary space.  */
+         MPN_COPY (vp, wp, vsize);
+       }
+    }
+
+  cy_limb = mpn_mul (wp, up, usize, vp, vsize);
+  wsize = usize + vsize;
+  wsize -= cy_limb == 0;
+
+  w->_mp_size = sign_product < 0 ? -wsize : wsize;
+  if (free_me != NULL)
+    (*__gmp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB);
+  TMP_FREE;
+}