Imported gcc-4.4.3

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

diff --git a/gmp/mpz/fdiv_qr_ui.c b/gmp/mpz/fdiv_qr_ui.c
new file mode 100644 (file)
index 0000000..7c41fc8
--- /dev/null
+++ b/gmp/mpz/fdiv_qr_ui.c
@@ -0,0 +1,108 @@
+/* mpz_fdiv_qr_ui -- Division rounding the quotient towards -infinity.
+   The remainder gets the same sign as the denominator.
+
+Copyright 1994, 1995, 1996, 1999, 2001, 2002, 2004 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"
+
+unsigned long int
+mpz_fdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
+{
+  mp_size_t ns, nn, qn;
+  mp_ptr np, qp;
+  mp_limb_t rl;
+
+  if (divisor == 0)
+    DIVIDE_BY_ZERO;
+
+  ns = SIZ(dividend);
+  if (ns == 0)
+    {
+      SIZ(quot) = 0;
+      SIZ(rem) = 0;
+      return 0;
+    }
+
+  nn = ABS(ns);
+  MPZ_REALLOC (quot, nn);
+  qp = PTR(quot);
+  np = PTR(dividend);
+
+#if BITS_PER_ULONG > GMP_NUMB_BITS  /* avoid warnings about shift amount */
+  if (divisor > GMP_NUMB_MAX)
+    {
+      mp_limb_t dp[2];
+      mp_ptr rp;
+      mp_size_t rn;
+
+      MPZ_REALLOC (rem, 2);
+      rp = PTR(rem);
+
+      if (nn == 1)             /* tdiv_qr requirements; tested above for 0 */
+       {
+         qp[0] = 0;
+         qn = 1;               /* a white lie, fixed below */
+         rl = np[0];
+         rp[0] = rl;
+       }
+      else
+       {
+         dp[0] = divisor & GMP_NUMB_MASK;
+         dp[1] = divisor >> GMP_NUMB_BITS;
+         mpn_tdiv_qr (qp, rp, (mp_size_t) 0, np, nn, dp, (mp_size_t) 2);
+         rl = rp[0] + (rp[1] << GMP_NUMB_BITS);
+         qn = nn - 2 + 1;
+       }
+
+      if (rl != 0 && ns < 0)
+       {
+         mpn_incr_u (qp, (mp_limb_t) 1);
+         rl = divisor - rl;
+         rp[0] = rl & GMP_NUMB_MASK;
+         rp[1] = rl >> GMP_NUMB_BITS;
+       }
+
+      qn -= qp[qn - 1] == 0; qn -= qn != 0 && qp[qn - 1] == 0;
+      rn = 1 + (rl > GMP_NUMB_MAX);  rn -= (rp[rn - 1] == 0);
+      SIZ(rem) = rn;
+    }
+  else
+#endif
+    {
+      rl = mpn_divrem_1 (qp, (mp_size_t) 0, np, nn, (mp_limb_t) divisor);
+      if (rl == 0)
+       SIZ(rem) = 0;
+      else
+       {
+         if (ns < 0)
+           {
+             mpn_incr_u (qp, (mp_limb_t) 1);
+             rl = divisor - rl;
+           }
+
+         PTR(rem)[0] = rl;
+         SIZ(rem) = rl != 0;
+       }
+      qn = nn - (qp[nn - 1] == 0);
+    }
+
+  SIZ(quot) = ns >= 0 ? qn : -qn;
+  return rl;
+}