diff -Naurd mpfr-3.1.1-a/PATCHES mpfr-3.1.1-b/PATCHES
--- mpfr-3.1.1-a/PATCHES	2012-08-30 09:28:51.000000000 +0000
+++ mpfr-3.1.1-b/PATCHES	2012-08-30 09:28:51.000000000 +0000
@@ -0,0 +1 @@
+get_decimal64
diff -Naurd mpfr-3.1.1-a/VERSION mpfr-3.1.1-b/VERSION
--- mpfr-3.1.1-a/VERSION	2012-07-03 15:01:13.000000000 +0000
+++ mpfr-3.1.1-b/VERSION	2012-08-30 09:28:51.000000000 +0000
@@ -1 +1 @@
-3.1.1
+3.1.1-p1
diff -Naurd mpfr-3.1.1-a/src/get_d64.c mpfr-3.1.1-b/src/get_d64.c
--- mpfr-3.1.1-a/src/get_d64.c	2012-07-03 15:01:18.000000000 +0000
+++ mpfr-3.1.1-b/src/get_d64.c	2012-08-30 09:28:51.000000000 +0000
@@ -32,6 +32,10 @@
 
 #ifdef MPFR_WANT_DECIMAL_FLOATS
 
+#ifndef DEC64_MAX
+# define DEC64_MAX 9.999999999999999E384dd
+#endif
+
 #ifdef DPD_FORMAT
 static int T[1000] = {
   0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
@@ -142,26 +146,14 @@
 static _Decimal64
 get_decimal64_min (int negative)
 {
-  union ieee_double_extract x;
-
-  x.s.sig = (negative) ? 1 : 0;
-  x.s.exp = 0;
-  x.s.manh = 0;
-  x.s.manl = 1;
-  return x.d;
+  return negative ? - 1E-398dd : 1E-398dd;
 }
 
 /* construct the decimal64 largest finite number with given sign */
 static _Decimal64
 get_decimal64_max (int negative)
 {
-  union ieee_double_extract x;
-
-  x.s.sig = (negative) ? 1 : 0;
-  x.s.exp = 1919;
-  x.s.manh = 1048575; /* 2^20-1 */
-  x.s.manl = ~0;
-  return x.d;
+  return negative ? - DEC64_MAX : DEC64_MAX;
 }
 
 /* one-to-one conversion:
@@ -334,7 +326,8 @@
   /* the largest decimal64 number is just below 10^(385) < 2^1279 */
   else if (MPFR_UNLIKELY (e > 1279)) /* then src >= 2^1279 */
     {
-      if (MPFR_RNDZ || (rnd_mode == MPFR_RNDU && negative != 0)
+      if (rnd_mode == MPFR_RNDZ
+          || (rnd_mode == MPFR_RNDU && negative != 0)
           || (rnd_mode == MPFR_RNDD && negative == 0))
         return get_decimal64_max (negative);
       else
@@ -354,6 +347,15 @@
              which corresponds to s=[0.]1000...000 and e=-397 */
           if (e < -397)
             {
+              if (rnd_mode == MPFR_RNDN && e == -398)
+                {
+                  /* If 0.5E-398 < |src| < 1E-398 (smallest subnormal),
+                     src should round to +/- 1E-398 in MPFR_RNDN. */
+                  mpfr_get_str (s, &e, 10, 1, src, MPFR_RNDA);
+                  return e == -398 && s[negative] <= '5' ?
+                    get_decimal64_zero (negative) :
+                    get_decimal64_min (negative);
+                }
               if (rnd_mode == MPFR_RNDZ || rnd_mode == MPFR_RNDN
                   || (rnd_mode == MPFR_RNDD && negative == 0)
                   || (rnd_mode == MPFR_RNDU && negative != 0))
@@ -379,7 +381,8 @@
          which corresponds to s=[0.]9999...999 and e=385 */
       else if (e > 385)
         {
-          if (MPFR_RNDZ || (rnd_mode == MPFR_RNDU && negative != 0)
+          if (rnd_mode == MPFR_RNDZ
+              || (rnd_mode == MPFR_RNDU && negative != 0)
               || (rnd_mode == MPFR_RNDD && negative == 0))
             return get_decimal64_max (negative);
           else
diff -Naurd mpfr-3.1.1-a/src/mpfr.h mpfr-3.1.1-b/src/mpfr.h
--- mpfr-3.1.1-a/src/mpfr.h	2012-07-03 15:01:19.000000000 +0000
+++ mpfr-3.1.1-b/src/mpfr.h	2012-08-30 09:28:51.000000000 +0000
@@ -27,7 +27,7 @@
 #define MPFR_VERSION_MAJOR 3
 #define MPFR_VERSION_MINOR 1
 #define MPFR_VERSION_PATCHLEVEL 1
-#define MPFR_VERSION_STRING "3.1.1"
+#define MPFR_VERSION_STRING "3.1.1-p1"
 
 /* Macros dealing with MPFR VERSION */
 #define MPFR_VERSION_NUM(a,b,c) (((a) << 16L) | ((b) << 8) | (c))
diff -Naurd mpfr-3.1.1-a/src/version.c mpfr-3.1.1-b/src/version.c
--- mpfr-3.1.1-a/src/version.c	2012-07-03 15:01:18.000000000 +0000
+++ mpfr-3.1.1-b/src/version.c	2012-08-30 09:28:51.000000000 +0000
@@ -25,5 +25,5 @@
 const char *
 mpfr_get_version (void)
 {
-  return "3.1.1";
+  return "3.1.1-p1";
 }
diff -Naurd mpfr-3.1.1-a/tests/tget_set_d64.c mpfr-3.1.1-b/tests/tget_set_d64.c
--- mpfr-3.1.1-a/tests/tget_set_d64.c	2012-07-03 15:01:24.000000000 +0000
+++ mpfr-3.1.1-b/tests/tget_set_d64.c	2012-08-30 09:28:51.000000000 +0000
@@ -25,6 +25,10 @@
 #include <stdlib.h> /* for exit */
 #include "mpfr-test.h"
 
+#ifndef DEC64_MAX
+# define DEC64_MAX 9.999999999999999E384dd
+#endif
+
 /* #define DEBUG */
 
 static void
@@ -149,6 +153,15 @@
   mpfr_set_str (x, "9.999999999999999E384", 10, MPFR_RNDZ);
   mpfr_set (y, x, MPFR_RNDZ);
   d = mpfr_get_decimal64 (x, MPFR_RNDU);
+  ASSERT_ALWAYS (d == DEC64_MAX);
+  mpfr_set_ui (x, 0, MPFR_RNDZ);
+  mpfr_set_decimal64 (x, d, MPFR_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
+
+  mpfr_set_str (x, "-9.999999999999999E384", 10, MPFR_RNDZ);
+  mpfr_set (y, x, MPFR_RNDZ);
+  d = mpfr_get_decimal64 (x, MPFR_RNDA);
+  ASSERT_ALWAYS (d == -DEC64_MAX);
   mpfr_set_ui (x, 0, MPFR_RNDZ);
   mpfr_set_decimal64 (x, d, MPFR_RNDZ);
   ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
@@ -225,6 +238,83 @@
   mpfr_clear (x);
 }
 
+static void
+check_overflow (void)
+{
+  mpfr_t x;
+  int err = 0, neg, rnd;
+
+  mpfr_init2 (x, 96);
+  for (neg = 0; neg < 2; neg++)
+    RND_LOOP (rnd)
+      {
+        _Decimal64 d, e;
+        mpfr_rnd_t r = (mpfr_rnd_t) rnd;
+        int sign = neg ? -1 : 1;
+
+        e = sign * (MPFR_IS_LIKE_RNDZ (r, neg) ? 1 : 2) * DEC64_MAX;
+        /* This tests the binary exponent e > 1279 case of get_d64.c */
+        mpfr_set_si_2exp (x, sign, 9999, MPFR_RNDN);
+        d = mpfr_get_decimal64 (x, r);
+        if (d != e)
+          {
+            printf ("Error 1 in check_overflow for %s, %s\n",
+                    neg ? "negative" : "positive",
+                    mpfr_print_rnd_mode (r));
+            err = 1;
+          }
+        /* This tests the decimal exponent e > 385 case of get_d64.c */
+        mpfr_set_si_2exp (x, sign * 31, 1274, MPFR_RNDN);
+        d = mpfr_get_decimal64 (x, r);
+        if (d != e)
+          {
+            printf ("Error 2 in check_overflow for %s, %s\n",
+                    neg ? "negative" : "positive",
+                    mpfr_print_rnd_mode (r));
+            err = 1;
+          }
+        /* This tests the last else (-382 <= e <= 385) of get_d64.c */
+        mpfr_set_decimal64 (x, e, MPFR_RNDA);
+        d = mpfr_get_decimal64 (x, r);
+        if (d != e)
+          {
+            printf ("Error 3 in check_overflow for %s, %s\n",
+                    neg ? "negative" : "positive",
+                    mpfr_print_rnd_mode (r));
+            err = 1;
+          }
+      }
+  mpfr_clear (x);
+  if (err)
+    exit (1);
+}
+
+static void
+check_tiny (void)
+{
+  mpfr_t x;
+  _Decimal64 d;
+
+  /* If 0.5E-398 < |x| < 1E-398 (smallest subnormal), x should round
+     to +/- 1E-398 in MPFR_RNDN. Note: the midpoint 0.5E-398 between
+     0 and 1E-398 is not a representable binary number, so that there
+     are no tests for it. */
+  mpfr_init2 (x, 128);
+  mpfr_set_str (x, "1E-398", 10, MPFR_RNDZ);
+  d = mpfr_get_decimal64 (x, MPFR_RNDN);
+  MPFR_ASSERTN (d == 1.0E-398dd);
+  mpfr_neg (x, x, MPFR_RNDN);
+  d = mpfr_get_decimal64 (x, MPFR_RNDN);
+  MPFR_ASSERTN (d == -1.0E-398dd);
+  mpfr_set_str (x, "0.5E-398", 10, MPFR_RNDU);
+  d = mpfr_get_decimal64 (x, MPFR_RNDN);
+  MPFR_ASSERTN (d == 1.0E-398dd);
+  mpfr_neg (x, x, MPFR_RNDN);
+  d = mpfr_get_decimal64 (x, MPFR_RNDN);
+  MPFR_ASSERTN (d == -1.0E-398dd);
+  mpfr_clear (x);
+}
+
 int
 main (void)
 {
@@ -241,6 +331,8 @@
   check_inf_nan ();
   check_random ();
   check_native ();
+  check_overflow ();
+  check_tiny ();
 
   tests_end_mpfr ();
   return 0;