Update.

1 files changed, 137 insertions, 0 deletions

diff --git a/sysdeps/ieee754/ldbl-128/ldbl2mpn.c b/sysdeps/ieee754/ldbl-128/ldbl2mpn.c
new file mode 100644
index 0000000000..68ecea8753
--- /dev/null
+++ b/sysdeps/ieee754/ldbl-128/ldbl2mpn.c
@@ -0,0 +1,137 @@
+/* Copyright (C) 1995, 1996, 1997, 1998, 1999 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C 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"
+#include "longlong.h"
+#include <ieee754.h>
+#include <float.h>
+#include <math.h>
+#include <stdlib.h>
+
+/* Convert a `long double' in IEEE854 quad-precision format to a
+   multi-precision integer representing the significand scaled up by its
+   number of bits (113 for long double) and an integral power of two
+   (MPN frexpl). */
+
+mp_size_t
+__mpn_extract_long_double (mp_ptr res_ptr, mp_size_t size,
+			   int *expt, int *is_neg,
+			   long double value)
+{
+  union ieee854_long_double u;
+  u.d = value;
+
+  *is_neg = u.ieee.negative;
+  *expt = (int) u.ieee.exponent - IEEE854_LONG_DOUBLE_BIAS;
+
+#if BITS_PER_MP_LIMB == 32
+  res_ptr[0] = u.ieee.mantissa3; /* Low-order 32 bits of fraction.  */
+  res_ptr[1] = u.ieee.mantissa2;
+  res_ptr[2] = u.ieee.mantissa1;
+  res_ptr[3] = u.ieee.mantissa0; /* High-order 32 bits.  */
+  #define N 4
+#elif BITS_PER_MP_LIMB == 64
+  /* Hopefully the compiler will combine the two bitfield extracts
+     and this composition into just the original quadword extract.  */
+  res_ptr[0] = ((unsigned long int) u.ieee.mantissa2 << 32) | u.ieee.mantissa3;
+  res_ptr[1] = ((unsigned long int) u.ieee.mantissa0 << 32) | u.ieee.mantissa1;
+  #define N 2
+#else
+  #error "mp_limb size " BITS_PER_MP_LIMB "not accounted for"
+#endif
+/* The format does not fill the last limb.  There are some zeros.  */
+#define NUM_LEADING_ZEROS (BITS_PER_MP_LIMB \
+			   - (LDBL_MANT_DIG - ((N - 1) * BITS_PER_MP_LIMB)))
+
+  if (u.ieee.exponent == 0)
+    {
+      /* A biased exponent of zero is a special case.
+	 Either it is a zero or it is a denormal number.  */
+      if (res_ptr[0] == 0 && res_ptr[1] == 0
+          && res_ptr[N - 2] == 0 && res_ptr[N - 1] == 0) /* Assumes N<=4.  */
+	/* It's zero.  */
+	*expt = 0;
+      else
+	{
+          /* It is a denormal number, meaning it has no implicit leading
+  	     one bit, and its exponent is in fact the format minimum.  */
+	  int cnt;
+
+#if N == 2
+	  if (res_ptr[N - 1] != 0)
+	    {
+	      count_leading_zeros (cnt, res_ptr[N - 1]);
+	      cnt -= NUM_LEADING_ZEROS;
+	      res_ptr[N - 1] = res_ptr[N - 1] << cnt
+			       | (res_ptr[0] >> (BITS_PER_MP_LIMB - cnt));
+	      res_ptr[0] <<= cnt;
+	      *expt = LDBL_MIN_EXP - 1 - cnt;
+	    }
+	  else
+	    {
+	      count_leading_zeros (cnt, res_ptr[0]);
+	      if (cnt >= NUM_LEADING_ZEROS)
+		{
+		  res_ptr[N - 1] = res_ptr[0] << (cnt - NUM_LEADING_ZEROS);
+		  res_ptr[0] = 0;
+		}
+	      else
+		{
+		  res_ptr[N - 1] = res_ptr[0] >> (NUM_LEADING_ZEROS - cnt);
+		  res_ptr[0] <<= BITS_PER_MP_LIMB - (NUM_LEADING_ZEROS - cnt);
+		}
+	      *expt = LDBL_MIN_EXP - 1
+		- (BITS_PER_MP_LIMB - NUM_LEADING_ZEROS) - cnt;
+	    }
+#else
+	  int j, k, l;
+
+	  for (j = N - 1; j > 0; j++)
+	    if (res_ptr[j] != 0)
+	      break;
+
+	  count_leading_zeros (cnt, res_ptr[j]);
+	  cnt -= NUM_LEADING_ZEROS;
+	  l = N - 1 - j;
+	  if (cnt < 0)
+	    {
+	      cnt += BITS_PER_MP_LIMB;
+	      l++;
+	    }
+	  if (!cnt)
+	    for (k = N - 1; k >= l; k--)
+	      res_ptr[k] = res_ptr[k-l];
+	  else
+	    for (k = N - 1; k >= l; k--)
+	      res_ptr[k] = res_ptr[k-l] << cnt
+			   | res_ptr[k-l-1] >> (BITS_PER_MP_LIMB - cnt);
+	    res_ptr[k--] = res_ptr[0] << cnt;
+
+	  for (; k >= 0; k--)
+	    res_ptr[k] = 0;
+	  *expt = LDBL_MIN_EXP - 1 - 3 * BITS_PER_MP_LIMB - cnt;
+#endif
+	}
+    }
+  else
+    /* Add the implicit leading one bit for a normalized number.  */
+    res_ptr[N - 1] |= 1L << (LDBL_MANT_DIG - 1 - ((N - 1) * BITS_PER_MP_LIMB));
+
+  return N;
+}