Imported gcc-4.4.3

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

diff --git a/gmp/mpz/tdiv_qr.c b/gmp/mpz/tdiv_qr.c
new file mode 100644 (file)
index 0000000..53ddae8
--- /dev/null
+++ b/gmp/mpz/tdiv_qr.c
@@ -0,0 +1,106 @@
+/* mpz_tdiv_qr(quot,rem,dividend,divisor) -- Set QUOT to DIVIDEND/DIVISOR,
+   and REM to DIVIDEND mod DIVISOR.
+
+Copyright 1991, 1993, 1994, 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 "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+#ifdef BERKELEY_MP
+#include "mp.h"
+#endif
+
+void
+#ifndef BERKELEY_MP
+mpz_tdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr num, mpz_srcptr den)
+#else /* BERKELEY_MP */
+mdiv (mpz_srcptr num, mpz_srcptr den, mpz_ptr quot, mpz_ptr rem)
+#endif /* BERKELEY_MP */
+{
+  mp_size_t ql;
+  mp_size_t ns, ds, nl, dl;
+  mp_ptr np, dp, qp, rp;
+  TMP_DECL;
+
+  ns = SIZ (num);
+  ds = SIZ (den);
+  nl = ABS (ns);
+  dl = ABS (ds);
+  ql = nl - dl + 1;
+
+  if (dl == 0)
+    DIVIDE_BY_ZERO;
+
+  MPZ_REALLOC (rem, dl);
+
+  if (ql <= 0)
+    {
+      if (num != rem)
+       {
+         mp_ptr np, rp;
+         np = PTR (num);
+         rp = PTR (rem);
+         MPN_COPY (rp, np, nl);
+         SIZ (rem) = SIZ (num);
+       }
+      /* This needs to follow the assignment to rem, in case the
+        numerator and quotient are the same.  */
+      SIZ (quot) = 0;
+      return;
+    }
+
+  MPZ_REALLOC (quot, ql);
+
+  TMP_MARK;
+  qp = PTR (quot);
+  rp = PTR (rem);
+  np = PTR (num);
+  dp = PTR (den);
+
+  /* FIXME: We should think about how to handle the temporary allocation.
+     Perhaps mpn_tdiv_qr should handle it, since it anyway often needs to
+     allocate temp space.  */
+
+  /* Copy denominator to temporary space if it overlaps with the quotient
+     or remainder.  */
+  if (dp == rp || dp == qp)
+    {
+      mp_ptr tp;
+      tp = (mp_ptr) TMP_ALLOC (dl * BYTES_PER_MP_LIMB);
+      MPN_COPY (tp, dp, dl);
+      dp = tp;
+    }
+  /* Copy numerator to temporary space if it overlaps with the quotient or
+     remainder.  */
+  if (np == rp || np == qp)
+    {
+      mp_ptr tp;
+      tp = (mp_ptr) TMP_ALLOC (nl * BYTES_PER_MP_LIMB);
+      MPN_COPY (tp, np, nl);
+      np = tp;
+    }
+
+  mpn_tdiv_qr (qp, rp, 0L, np, nl, dp, dl);
+
+  ql -=  qp[ql - 1] == 0;
+  MPN_NORMALIZE (rp, dl);
+
+  SIZ (quot) = (ns ^ ds) >= 0 ? ql : -ql;
+  SIZ (rem) = ns >= 0 ? dl : -dl;
+  TMP_FREE;
+}