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

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

diff --git a/ghc/runtime/gmp/mpz_mul_ui.c b/ghc/runtime/gmp/mpz_mul_ui.c
new file mode 100644 (file)
index 0000000..f35eb4b
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_mul_ui.c
@@ -0,0 +1,78 @@
+/* mpz_mul_ui(product, multiplier, small_multiplicand) -- Set
+   PRODUCT to MULTIPLICATOR times SMALL_MULTIPLICAND.
+
+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 "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+void
+#ifdef __STDC__
+mpz_mul_ui (MP_INT *prod, const MP_INT *mult,
+           unsigned long int small_mult)
+#else
+mpz_mul_ui (prod, mult, small_mult)
+     MP_INT *prod;
+     const MP_INT *mult;
+     unsigned long int small_mult;
+#endif
+{
+  mp_size mult_size = mult->size;
+  mp_size sign_product = mult_size;
+  mp_size i;
+  mp_limb cy;
+  mp_size prod_size;
+  mp_srcptr mult_ptr;
+  mp_ptr prod_ptr;
+
+  mult_size = ABS (mult_size);
+
+  if (mult_size == 0 || small_mult == 0)
+    {
+      prod->size = 0;
+      return;
+    }
+
+  prod_size = mult_size + 1;
+  if (prod->alloc < prod_size)
+    _mpz_realloc (prod, prod_size);
+
+  mult_ptr = mult->d;
+  prod_ptr = prod->d;
+
+  cy = 0;
+  for (i = 0; i < mult_size; i++)
+    {
+      mp_limb p1, p0;
+      umul_ppmm (p1, p0, small_mult, mult_ptr[i]);
+      p0 += cy;
+      cy = p1 + (p0 < cy);
+      prod_ptr[i] = p0;
+    }
+
+  prod_size = mult_size;
+  if (cy != 0)
+    {
+      prod_ptr[mult_size] = cy;
+      prod_size++;
+    }
+
+  prod->size = sign_product > 0 ? prod_size : -prod_size;
+}