1 files changed, 47 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/mpn2dbl.c b/REORG.TODO/sysdeps/ieee754/dbl-64/mpn2dbl.c
new file mode 100644
index 0000000000..1fec0ce920
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/dbl-64/mpn2dbl.c
@@ -0,0 +1,47 @@
+/* Copyright (C) 1995-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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 C 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 C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include <ieee754.h>
+#include <float.h>
+
+/* Convert a multi-precision integer of the needed number of bits (53 for
+   double) and an integral power of two to a `double' in IEEE754 double-
+   precision format.  */
+
+double
+__mpn_construct_double (mp_srcptr frac_ptr, int expt, int negative)
+{
+  union ieee754_double u;
+
+  u.ieee.negative = negative;
+  u.ieee.exponent = expt + IEEE754_DOUBLE_BIAS;
+#if BITS_PER_MP_LIMB == 32
+  u.ieee.mantissa1 = frac_ptr[0];
+  u.ieee.mantissa0 = frac_ptr[1] & (((mp_limb_t) 1
+				     << (DBL_MANT_DIG - 32)) - 1);
+#elif BITS_PER_MP_LIMB == 64
+  u.ieee.mantissa1 = frac_ptr[0] & (((mp_limb_t) 1 << 32) - 1);
+  u.ieee.mantissa0 = (frac_ptr[0] >> 32) & (((mp_limb_t) 1
+					     << (DBL_MANT_DIG - 32)) - 1);
+#else
+  # error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
+#endif
+
+  return u.d;
+}