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

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

diff --git a/ghc/runtime/gmp/sdiv.c b/ghc/runtime/gmp/sdiv.c
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+/* sdiv -- Divide a MINT by a short integer.  Produce a MINT quotient
+   and a short remainder.
+
+Copyright (C) 1991 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 "mp.h"
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+void
+#ifdef __STDC__
+sdiv (const MINT *dividend, signed short int divisor_short, MINT *quot, short *rem_ptr)
+#else
+sdiv (dividend, divisor_short, quot, rem_ptr)
+     const MINT *dividend;
+     short int divisor_short;
+     MINT *quot;
+     short *rem_ptr;
+#endif
+{
+  mp_size sign_dividend;
+  signed long int sign_divisor;
+  mp_size dividend_size, quot_size;
+  mp_ptr dividend_ptr, quot_ptr;
+  mp_limb divisor_limb;
+  mp_limb remainder_limb;
+
+  sign_dividend = dividend->size;
+  dividend_size = ABS (dividend->size);
+
+  if (dividend_size == 0)
+    {
+      quot->size = 0;
+      *rem_ptr = 0;
+      return;
+    }
+
+  sign_divisor = divisor_short;
+  divisor_limb = ABS (divisor_short);
+
+  /* No need for temporary allocation and copying even 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);
+
+  *rem_ptr = sign_dividend >= 0 ? remainder_limb : -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_divisor ^ sign_dividend) >= 0 ? quot_size : -quot_size;
+}