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diff --git a/source/s_tryPropagateNaNExtF80M.c b/source/s_tryPropagateNaNExtF80M.c
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+++ b/source/s_tryPropagateNaNExtF80M.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 "platform.h"
+#include "internals.h"
+#include "specialize.h"
+
+bool
+ softfloat_tryPropagateNaNExtF80M(
+     const struct extFloat80M *aSPtr,
+     const struct extFloat80M *bSPtr,
+     struct extFloat80M *zSPtr
+ )
+{
+    uint_fast16_t ui64;
+    uint64_t ui0;
+
+    ui64 = aSPtr->signExp;
+    ui0  = aSPtr->signif;
+    if ( isNaNExtF80UI( ui64, ui0 ) ) goto propagateNaN;
+    ui64 = bSPtr->signExp;
+    ui0  = bSPtr->signif;
+    if ( isNaNExtF80UI( ui64, ui0 ) ) goto propagateNaN;
+    return false;
+ propagateNaN:
+    softfloat_propagateNaNExtF80M( aSPtr, bSPtr, zSPtr );
+    return true;
+
+}
+