Reorganisation of the source tree

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

diff --git a/rts/gmp/mpz/fdiv_qr.c b/rts/gmp/mpz/fdiv_qr.c
new file mode 100644 (file)
index 0000000..06ce506
--- /dev/null
+++ b/rts/gmp/mpz/fdiv_qr.c
@@ -0,0 +1,64 @@
+/* mpz_fdiv_qr -- Division rounding the quotient towards -infinity.
+   The remainder gets the same sign as the denominator.
+
+Copyright (C) 1994, 1995, 1996, 2000 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 Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser 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_fdiv_qr (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
+#else
+mpz_fdiv_qr (quot, rem, dividend, divisor)
+     mpz_ptr quot;
+     mpz_ptr rem;
+     mpz_srcptr dividend;
+     mpz_srcptr divisor;
+#endif
+{
+  mp_size_t divisor_size = divisor->_mp_size;
+  mp_size_t xsize;
+  mpz_t temp_divisor;          /* N.B.: lives until function returns! */
+  TMP_DECL (marker);
+
+  TMP_MARK (marker);
+
+  /* We need the original value of the divisor after the quotient and
+     remainder have been preliminary calculated.  We have to copy it to
+     temporary space if it's the same variable as either QUOT or REM.  */
+  if (quot == divisor || rem == divisor)
+    {
+      MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
+      mpz_set (temp_divisor, divisor);
+      divisor = temp_divisor;
+    }
+
+  xsize = dividend->_mp_size ^ divisor_size;;
+  mpz_tdiv_qr (quot, rem, dividend, divisor);
+
+  if (xsize < 0 && rem->_mp_size != 0)
+    {
+      mpz_sub_ui (quot, quot, 1L);
+      mpz_add (rem, rem, divisor);
+    }
+
+  TMP_FREE (marker);
+}