[project @ 1996-01-08 20:28:12 by partain]

[ghc-hetmet.git] / ghc / runtime / gmp / mpz_dm_ui.c

diff --git a/ghc/runtime/gmp/mpz_dm_ui.c b/ghc/runtime/gmp/mpz_dm_ui.c
new file mode 100644 (file)
index 0000000..e8c3cf6
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_dm_ui.c
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+/* mpz_divmod_ui(quot,rem,dividend,short_divisor) --
+   Set QUOT to DIVIDEND / SHORT_DIVISOR
+   and REM to DIVIDEND mod SHORT_DIVISOR.
+
+Copyright (C) 1991, 1992 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 General Public License as published by
+the Free Software Foundation; either version 2, 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the GNU MP Library; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+void
+#ifdef __STDC__
+mpz_divmod_ui (MP_INT *quot, MP_INT *rem,
+              const MP_INT *dividend, unsigned long int divisor_limb)
+#else
+mpz_divmod_ui (quot, rem, dividend, divisor_limb)
+     MP_INT *quot;
+     MP_INT *rem;
+     const MP_INT *dividend;
+     unsigned long int divisor_limb;
+#endif
+{
+  mp_size sign_dividend;
+  mp_size dividend_size, quot_size;
+  mp_ptr dividend_ptr, quot_ptr;
+  mp_limb remainder_limb;
+
+  sign_dividend = dividend->size;
+  dividend_size = ABS (dividend->size);
+
+  if (dividend_size == 0)
+    {
+      quot->size = 0;
+      rem->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->alloc < dividend_size)
+    _mpz_realloc (quot, dividend_size);
+
+  quot_ptr = quot->d;
+  dividend_ptr = dividend->d;
+
+  remainder_limb = mpn_divmod_1 (quot_ptr,
+                                dividend_ptr, dividend_size, divisor_limb);
+
+  if (remainder_limb == 0)
+    rem->size = 0;
+  else
+    {
+      /* Store the single-limb remainder.  We don't check if there's space
+        for just one limb, since no function ever makes zero space.  */
+      rem->size = sign_dividend >= 0 ? 1 : -1;
+      rem->d[0] = remainder_limb;
+    }
+
+  /* The quotient is DIVIDEND_SIZE limbs, but the most significant
+     might be zero.  Set QUOT_SIZE properly. */
+  quot_size = dividend_size - (quot_ptr[dividend_size - 1] == 0);
+  quot->size = sign_dividend >= 0 ? quot_size : -quot_size;
+}