--- a/libiberty/floatformat.c	Sun Aug 21 07:07:55 2011 +0900
+++ b/libiberty/floatformat.c	Fri Oct 27 22:46:09 2017 +0900
@@ -1,6 +1,5 @@
 /* IEEE floating point support routines, for GDB, the GNU Debugger.
-   Copyright 1991, 1994, 1999, 2000, 2003, 2005, 2006, 2010
-   Free Software Foundation, Inc.
+   Copyright (C) 1991-2017 Free Software Foundation, Inc.
 
 This file is part of GDB.
 
@@ -19,7 +18,9 @@
 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 /* This is needed to pick up the NAN macro on some systems.  */
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
@@ -371,14 +372,23 @@
     }
 }
 
-const struct floatformat floatformat_ibm_long_double =
+const struct floatformat floatformat_ibm_long_double_big =
 {
   floatformat_big, 128, 0, 1, 11, 1023, 2047, 12, 52,
   floatformat_intbit_no,
-  "floatformat_ibm_long_double",
+  "floatformat_ibm_long_double_big",
   floatformat_ibm_long_double_is_valid,
   &floatformat_ieee_double_big
 };
+
+const struct floatformat floatformat_ibm_long_double_little =
+{
+  floatformat_little, 128, 0, 1, 11, 1023, 2047, 12, 52,
+  floatformat_intbit_no,
+  "floatformat_ibm_long_double_little",
+  floatformat_ibm_long_double_is_valid,
+  &floatformat_ieee_double_little
+};
 
 
 #ifndef min
@@ -463,7 +473,6 @@
   unsigned long mant;
   unsigned int mant_bits, mant_off;
   int mant_bits_left;
-  int special_exponent;		/* It's a NaN, denorm or zero */
 
   /* Split values are not handled specially, since the top half has
      the correctly rounded double value (in the only supported case of
@@ -503,20 +512,20 @@
   mant_off = fmt->man_start;
   dto = 0.0;
 
-  special_exponent = exponent == 0 || (unsigned long) exponent == fmt->exp_nan;
-
-  /* Don't bias zero's, denorms or NaNs.  */
-  if (!special_exponent)
-    exponent -= fmt->exp_bias;
-
   /* Build the result algebraically.  Might go infinite, underflow, etc;
      who cares. */
 
-  /* If this format uses a hidden bit, explicitly add it in now.  Otherwise,
-     increment the exponent by one to account for the integer bit.  */
+  /* For denorms use minimum exponent.  */
+  if (exponent == 0)
+    exponent = 1 - fmt->exp_bias;
+  else
+    {
+      exponent -= fmt->exp_bias;
 
-  if (!special_exponent)
-    {
+      /* If this format uses a hidden bit, explicitly add it in now.
+	 Otherwise, increment the exponent by one to account for the
+	 integer bit.  */
+
       if (fmt->intbit == floatformat_intbit_no)
 	dto = ldexp (1.0, exponent);
       else
@@ -530,18 +539,8 @@
       mant = get_field (ufrom, fmt->byteorder, fmt->totalsize,
 			 mant_off, mant_bits);
 
-      /* Handle denormalized numbers.  FIXME: What should we do for
-	 non-IEEE formats?  */
-      if (special_exponent && exponent == 0 && mant != 0)
-	dto += ldexp ((double)mant,
-		      (- fmt->exp_bias
-		       - mant_bits
-		       - (mant_off - fmt->man_start)
-		       + 1));
-      else
-	dto += ldexp ((double)mant, exponent - mant_bits);
-      if (exponent != 0)
-	exponent -= mant_bits;
+      dto += ldexp ((double) mant, exponent - mant_bits);
+      exponent -= mant_bits;
       mant_off += mant_bits;
       mant_bits_left -= mant_bits;
     }
@@ -756,6 +755,7 @@
 {
   ieee_test (0.0);
   ieee_test (0.5);
+  ieee_test (1.1);
   ieee_test (256.0);
   ieee_test (0.12345);
   ieee_test (234235.78907234);