1 files changed, 92 insertions, 0 deletions
diff --git a/ghc/runtime/gmp/mpq_div.c b/ghc/runtime/gmp/mpq_div.c
new file mode 100644
index 0000000000..f08aa27be8
--- /dev/null
+++ b/ghc/runtime/gmp/mpq_div.c
@@ -0,0 +1,92 @@
+/* mpq_div -- divide two rational numbers.
+
+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"
+
+void
+#ifdef __STDC__
+mpq_div (MP_RAT *quot, const MP_RAT *dividend, const MP_RAT *divisor)
+#else
+mpq_div (quot, dividend, divisor)
+     MP_RAT *quot;
+     const MP_RAT *dividend;
+     const MP_RAT *divisor;
+#endif
+{
+  MP_INT gcd1, gcd2;
+  MP_INT tmp1, tmp2;
+  MP_INT numtmp;
+
+  mpz_init (&gcd1);
+  mpz_init (&gcd2);
+  mpz_init (&tmp1);
+  mpz_init (&tmp2);
+  mpz_init (&numtmp);
+
+  /* QUOT might be identical to either operand, so don't store the
+     result there until we are finished with the input operands.  We
+     dare to overwrite the numerator of QUOT when we are finished
+     with the numerators of DIVIDEND and DIVISOR.  */
+
+  mpz_gcd (&gcd1, &(dividend->num), &(divisor->num));
+  mpz_gcd (&gcd2, &(divisor->den), &(dividend->den));
+
+  if (gcd1.size > 1 || gcd1.d[0] != 1)
+    mpz_div (&tmp1, &(dividend->num), &gcd1);
+  else
+    mpz_set (&tmp1, &(dividend->num));
+
+  if (gcd2.size > 1 || gcd2.d[0] != 1)
+    mpz_div (&tmp2, &(divisor->den), &gcd2);
+  else
+    mpz_set (&tmp2, &(divisor->den));
+
+  mpz_mul (&numtmp, &tmp1, &tmp2);
+
+  if (gcd1.size > 1 || gcd1.d[0] != 1)
+    mpz_div (&tmp1, &(divisor->num), &gcd1);
+  else
+    mpz_set (&tmp1, &(divisor->num));
+
+  if (gcd2.size > 1 || gcd2.d[0] != 1)
+    mpz_div (&tmp2, &(dividend->den), &gcd2);
+  else
+    mpz_set (&tmp2, &(dividend->den));
+
+  mpz_mul (&(quot->den), &tmp1, &tmp2);
+
+  /* We needed to go via NUMTMP to take care of QUOT being the same
+     as either input operands.  Now move NUMTMP to QUOT->NUM.  */
+  mpz_set (&(quot->num), &numtmp);
+
+  /* Keep the denominator positive.  */
+  if (quot->den.size < 0)
+    {
+      quot->den.size = -quot->den.size;
+      quot->num.size = -quot->num.size;
+    }
+
+  mpz_clear (&numtmp);
+  mpz_clear (&tmp2);
+  mpz_clear (&tmp1);
+  mpz_clear (&gcd2);
+  mpz_clear (&gcd1);
+}