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diff --git a/gmp/mpq/set_d.c b/gmp/mpq/set_d.c
new file mode 100644
index 00000000..1e806f80
--- /dev/null
+++ b/gmp/mpq/set_d.c
@@ -0,0 +1,158 @@
+/* mpq_set_d(mpq_t q, double d) -- Set q to d without rounding.
+
+Copyright 2000, 2002, 2003 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 3 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.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "config.h"
+
+#if HAVE_FLOAT_H
+#include <float.h>  /* for DBL_MAX */
+#endif
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+#if LIMBS_PER_DOUBLE > 4
+  choke me
+#endif
+
+void
+mpq_set_d (mpq_ptr dest, double d)
+{
+  int negative;
+  mp_exp_t exp;
+  mp_limb_t tp[LIMBS_PER_DOUBLE];
+  mp_ptr np, dp;
+  mp_size_t nn, dn;
+  int c;
+
+  DOUBLE_NAN_INF_ACTION (d,
+                         __gmp_invalid_operation (),
+                         __gmp_invalid_operation ());
+
+  negative = d < 0;
+  d = ABS (d);
+
+  exp = __gmp_extract_double (tp, d);
+
+  /* There are two main version of the conversion.  The `then' arm handles
+     numbers with a fractional part, while the `else' arm handles integers.  */
+#if LIMBS_PER_DOUBLE == 4
+  if (exp <= 1 || (exp == 2 && (tp[0] | tp[1]) != 0))
+#endif
+#if LIMBS_PER_DOUBLE == 3
+  if (exp <= 1 || (exp == 2 && tp[0] != 0))
+#endif
+#if LIMBS_PER_DOUBLE == 2
+  if (exp <= 1)
+#endif
+    {
+      if (d == 0.0)
+	{
+	  SIZ(&(dest->_mp_num)) = 0;
+	  SIZ(&(dest->_mp_den)) = 1;
+	  PTR(&(dest->_mp_den))[0] = 1;
+	  return;
+	}
+
+      dn = -exp;
+      MPZ_REALLOC (&(dest->_mp_num), 3);
+      np = PTR(&(dest->_mp_num));
+#if LIMBS_PER_DOUBLE == 4
+      if ((tp[0] | tp[1] | tp[2]) == 0)
+	np[0] = tp[3], nn = 1;
+      else if ((tp[0] | tp[1]) == 0)
+	np[1] = tp[3], np[0] = tp[2], nn = 2;
+      else if (tp[0] == 0)
+	np[2] = tp[3], np[1] = tp[2], np[0] = tp[1], nn = 3;
+      else
+	np[3] = tp[3], np[2] = tp[2], np[1] = tp[1], np[0] = tp[0], nn = 4;
+#endif
+#if LIMBS_PER_DOUBLE == 3
+      if ((tp[0] | tp[1]) == 0)
+	np[0] = tp[2], nn = 1;
+      else if (tp[0] == 0)
+	np[1] = tp[2], np[0] = tp[1], nn = 2;
+      else
+	np[2] = tp[2], np[1] = tp[1], np[0] = tp[0], nn = 3;
+#endif
+#if LIMBS_PER_DOUBLE == 2
+      if (tp[0] == 0)
+	np[0] = tp[1], nn = 1;
+      else
+	np[1] = tp[1], np[0] = tp[0], nn = 2;
+#endif
+      dn += nn + 1;
+      ASSERT_ALWAYS (dn > 0);
+      MPZ_REALLOC (&(dest->_mp_den), dn);
+      dp = PTR(&(dest->_mp_den));
+      MPN_ZERO (dp, dn - 1);
+      dp[dn - 1] = 1;
+      count_trailing_zeros (c, np[0] | dp[0]);
+      if (c != 0)
+	{
+	  mpn_rshift (np, np, nn, c);
+	  nn -= np[nn - 1] == 0;
+	  mpn_rshift (dp, dp, dn, c);
+	  dn -= dp[dn - 1] == 0;
+	}
+      SIZ(&(dest->_mp_den)) = dn;
+      SIZ(&(dest->_mp_num)) = negative ? -nn : nn;
+    }
+  else
+    {
+      nn = exp;
+      MPZ_REALLOC (&(dest->_mp_num), nn);
+      np = PTR(&(dest->_mp_num));
+      switch (nn)
+        {
+	default:
+	  MPN_ZERO (np, nn - LIMBS_PER_DOUBLE);
+	  np += nn - LIMBS_PER_DOUBLE;
+	  /* fall through */
+#if LIMBS_PER_DOUBLE == 2
+	case 2:
+	  np[1] = tp[1], np[0] = tp[0];
+	  break;
+#endif
+#if LIMBS_PER_DOUBLE == 3
+	case 3:
+	  np[2] = tp[2], np[1] = tp[1], np[0] = tp[0];
+	  break;
+	case 2:
+	  np[1] = tp[2], np[0] = tp[1];
+	  break;
+#endif
+#if LIMBS_PER_DOUBLE == 4
+	case 4:
+	  np[3] = tp[3], np[2] = tp[2], np[1] = tp[1], np[0] = tp[0];
+	  break;
+	case 3:
+	  np[2] = tp[3], np[1] = tp[2], np[0] = tp[1];
+	  break;
+	case 2:
+	  np[1] = tp[3], np[0] = tp[2];
+	  break;
+#endif
+	}
+      dp = PTR(&(dest->_mp_den));
+      dp[0] = 1;
+      SIZ(&(dest->_mp_den)) = 1;
+      SIZ(&(dest->_mp_num)) = negative ? -nn : nn;
+    }
+}