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diff --git a/source/s_roundPackToF64.c b/source/s_roundPackToF64.c
new file mode 100644
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+++ b/source/s_roundPackToF64.c
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+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014 The Regents of the University of California
+(Regents).  All Rights Reserved.  Redistribution and use in source and binary
+forms, with or without modification, are permitted provided that the following
+conditions are met:
+
+Redistributions of source code must retain the above copyright notice,
+this list of conditions, and the following two paragraphs of disclaimer.
+Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions, and the following two paragraphs of disclaimer in the
+documentation and/or other materials provided with the distribution.  Neither
+the name of the Regents nor the names of its contributors may be used to
+endorse or promote products derived from this software without specific prior
+written permission.
+
+IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
+OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
+BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
+HEREUNDER IS PROVIDED "AS IS".  REGENTS HAS NO OBLIGATION TO PROVIDE
+MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+
+=============================================================================*/
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "softfloat.h"
+
+float64_t
+ softfloat_roundPackToF64( bool sign, int_fast16_t exp, uint_fast64_t sig )
+{
+    uint_fast8_t roundingMode;
+    bool roundNearEven;
+    uint_fast16_t roundIncrement, roundBits;
+    bool isTiny;
+    uint_fast64_t uiZ;
+    union ui64_f64 uZ;
+
+    roundingMode = softfloat_roundingMode;
+    roundNearEven = (roundingMode == softfloat_round_near_even);
+    roundIncrement = 0x200;
+    if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) {
+        roundIncrement =
+            (roundingMode
+                 == (sign ? softfloat_round_min : softfloat_round_max))
+                ? 0x3FF
+                : 0;
+    }
+    roundBits = sig & 0x3FF;
+    if ( 0x7FD <= (uint16_t) exp ) {
+        if ( exp < 0 ) {
+            isTiny =
+                   (softfloat_detectTininess
+                        == softfloat_tininess_beforeRounding)
+                || (exp < -1)
+                || (sig + roundIncrement < UINT64_C( 0x8000000000000000 ));
+            sig = softfloat_shiftRightJam64( sig, -exp );
+            exp = 0;
+            roundBits = sig & 0x3FF;
+            if ( isTiny && roundBits ) {
+                softfloat_raiseFlags( softfloat_flag_underflow );
+            }
+        } else if (
+            (0x7FD < exp)
+                || (UINT64_C( 0x8000000000000000 ) <= sig + roundIncrement)
+        ) {
+            softfloat_raiseFlags(
+                softfloat_flag_overflow | softfloat_flag_inexact );
+            uiZ = packToF64UI( sign, 0x7FF, 0 ) - ! roundIncrement;
+            goto uiZ;
+        }
+    }
+    if ( roundBits ) softfloat_exceptionFlags |= softfloat_flag_inexact;
+    sig = (sig + roundIncrement)>>10;
+    sig &= ~(! (roundBits ^ 0x200) & roundNearEven);
+    uiZ = packToF64UI( sign, sig ? exp : 0, sig );
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+