[project @ 1998-06-05 14:38:04 by simonm]

[ghc-hetmet.git] / ghc / rts / gmp / mpz / tdiv_q_ui.c

diff --git a/ghc/rts/gmp/mpz/tdiv_q_ui.c b/ghc/rts/gmp/mpz/tdiv_q_ui.c
new file mode 100644 (file)
index 0000000..9048e0a
--- /dev/null
+++ b/ghc/rts/gmp/mpz/tdiv_q_ui.c
@@ -0,0 +1,63 @@
+/* mpz_tdiv_q_ui(quot, dividend, divisor_limb)
+   -- Divide DIVIDEND by DIVISOR_LIMB and store the result in QUOT.
+
+Copyright (C) 1991, 1993, 1994, 1996 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#if __STDC__
+mpz_tdiv_q_ui (mpz_ptr quot, mpz_srcptr dividend, unsigned long int divisor)
+#else
+mpz_tdiv_q_ui (quot, dividend, divisor)
+     mpz_ptr quot;
+     mpz_srcptr dividend;
+     unsigned long int divisor;
+#endif
+{
+  mp_size_t dividend_size;
+  mp_size_t size;
+  mp_ptr quot_ptr;
+
+  dividend_size = dividend->_mp_size;
+  size = ABS (dividend_size);
+
+  if (size == 0)
+    {
+      quot->_mp_size = 0;
+      return;
+    }
+
+  /* No need for temporary allocation and copying if QUOT == DIVIDEND as
+     the divisor is just one limb, and thus no intermediate remainders
+     need to be stored.  */
+
+  if (quot->_mp_alloc < size)
+    _mpz_realloc (quot, size);
+
+  quot_ptr = quot->_mp_d;
+
+  mpn_divmod_1 (quot_ptr, dividend->_mp_d, size, (mp_limb_t) divisor);
+
+  /* The quotient is SIZE limbs, but the most significant might be zero. */
+  size -= quot_ptr[size - 1] == 0;
+  quot->_mp_size = dividend_size >= 0 ? size : -size;
+}