1 files changed, 65 insertions, 0 deletions
diff --git a/ghc/runtime/gmp/mpz_mod_ui.c b/ghc/runtime/gmp/mpz_mod_ui.c
new file mode 100644
index 0000000000..35a4d7d3c2
--- /dev/null
+++ b/ghc/runtime/gmp/mpz_mod_ui.c
@@ -0,0 +1,65 @@
+/* mpz_mod_ui(rem, dividend, divisor_limb)
+   -- Set REM to DIVDEND mod DIVISOR_LIMB.
+
+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_mod_ui (MP_INT *rem, const MP_INT *dividend,
+	    unsigned long int divisor_limb)
+#else
+mpz_mod_ui (rem, dividend, divisor_limb)
+     MP_INT *rem;
+     const MP_INT *dividend;
+     unsigned long int divisor_limb;
+#endif
+{
+  mp_size sign_dividend;
+  mp_size dividend_size;
+  mp_limb remainder_limb;
+
+  sign_dividend = dividend->size;
+  dividend_size = ABS (dividend->size);
+
+  if (dividend_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.  */
+
+  remainder_limb = mpn_mod_1 (dividend->d, 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;
+    }
+}