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diff --git a/source/8086/s_propagateNaNF128M.c b/source/8086/s_propagateNaNF128M.c
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+++ b/source/8086/s_propagateNaNF128M.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 "specialize.h"
+#include "softfloat.h"
+
+/*----------------------------------------------------------------------------
+| Assuming at least one of the two 128-bit floating-point values pointed to by
+| `aWPtr' and `bWPtr' is a NaN, stores the combined NaN result at the location
+| pointed to by `zWPtr'.  If either original floating-point value is a
+| signaling NaN, the invalid exception is raised.  Each of `aWPtr', `bWPtr',
+| and `zWPtr' points to an array of four 32-bit elements that concatenate in
+| the platform's normal endian order to form a 128-bit floating-point value.
+*----------------------------------------------------------------------------*/
+void
+ softfloat_propagateNaNF128M(
+     const uint32_t *aWPtr, const uint32_t *bWPtr, uint32_t *zWPtr )
+{
+    bool isSigNaNA;
+    const uint32_t *ptr;
+    bool isSigNaNB;
+    uint32_t uiA96, uiB96, wordMagA, wordMagB;
+
+    isSigNaNA = f128M_isSignalingNaN( (const float128_t *) aWPtr );
+    ptr = aWPtr;
+    if ( ! bWPtr ) {
+        if ( isSigNaNA ) softfloat_raiseFlags( softfloat_flag_invalid );
+        goto copy;
+    }
+    isSigNaNB = f128M_isSignalingNaN( (const float128_t *) bWPtr );
+    if ( isSigNaNA | isSigNaNB ) {
+        softfloat_raiseFlags( softfloat_flag_invalid );
+        if ( isSigNaNA ) {
+            if ( isSigNaNB ) goto returnLargerUIMag;
+            if ( softfloat_isNaNF128M( bWPtr ) ) goto copyB;
+            goto copy;
+        } else {
+            if ( softfloat_isNaNF128M( aWPtr ) ) goto copy;
+            goto copyB;
+        }
+    }
+ returnLargerUIMag:
+    uiA96 = aWPtr[indexWordHi( 4 )];
+    uiB96 = bWPtr[indexWordHi( 4 )];
+    wordMagA = uiA96 & 0x7FFFFFFF;
+    wordMagB = uiB96 & 0x7FFFFFFF;
+    if ( wordMagA < wordMagB ) goto copyB;
+    if ( wordMagB < wordMagA ) goto copy;
+    wordMagA = aWPtr[indexWord( 4, 2 )];
+    wordMagB = bWPtr[indexWord( 4, 2 )];
+    if ( wordMagA < wordMagB ) goto copyB;
+    if ( wordMagB < wordMagA ) goto copy;
+    wordMagA = aWPtr[indexWord( 4, 1 )];
+    wordMagB = bWPtr[indexWord( 4, 1 )];
+    if ( wordMagA < wordMagB ) goto copyB;
+    if ( wordMagB < wordMagA ) goto copy;
+    wordMagA = aWPtr[indexWord( 4, 0 )];
+    wordMagB = bWPtr[indexWord( 4, 0 )];
+    if ( wordMagA < wordMagB ) goto copyB;
+    if ( wordMagB < wordMagA ) goto copy;
+    if ( uiA96 < uiB96 ) goto copy;
+ copyB:
+    ptr = bWPtr;
+ copy:
+    zWPtr[indexWordHi( 4 )] = ptr[indexWordHi( 4 )] | 0x00008000;
+    zWPtr[indexWord( 4, 2 )] = ptr[indexWord( 4, 2 )];
+    zWPtr[indexWord( 4, 1 )] = ptr[indexWord( 4, 1 )];
+    zWPtr[indexWord( 4, 0 )] = ptr[indexWord( 4, 0 )];
+
+}
+