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diff --git a/source/extF80M_to_ui64.c b/source/extF80M_to_ui64.c
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+++ b/source/extF80M_to_ui64.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"
+
+#ifdef SOFTFLOAT_FAST_INT64
+
+uint_fast64_t
+ extF80M_to_ui64(
+     const extFloat80_t *aPtr, uint_fast8_t roundingMode, bool exact )
+{
+
+    return extF80_to_ui64( *aPtr, roundingMode, exact );
+
+}
+
+#else
+
+uint_fast64_t
+ extF80M_to_ui64(
+     const extFloat80_t *aPtr, uint_fast8_t roundingMode, bool exact )
+{
+    const struct extFloat80M *aSPtr;
+    uint_fast16_t uiA64;
+    int32_t exp, shiftCount;
+    bool sign;
+    uint64_t sig;
+    uint32_t extSig[3];
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    aSPtr = (const struct extFloat80M *) aPtr;
+    uiA64 = aSPtr->signExp;
+    exp = expExtF80UI64( uiA64 );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    shiftCount = 0x403E - exp;
+    if ( shiftCount < 0 ) {
+        softfloat_raiseFlags( softfloat_flag_invalid );
+        return UINT64_C( 0xFFFFFFFFFFFFFFFF );
+    }
+    sign = signExtF80UI64( uiA64 );
+    sig = aSPtr->signif;
+    extSig[indexWord( 3, 2 )] = sig>>32;
+    extSig[indexWord( 3, 1 )] = sig;
+    extSig[indexWord( 3, 0 )] = 0;
+    if ( shiftCount ) softfloat_shiftRightJam96M( extSig, shiftCount, extSig );
+    return softfloat_roundPackMToUI64( sign, extSig, roundingMode, exact );
+
+}
+
+#endif
+