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diff --git a/src/libs/softfloat-3e/source/f64_add.c b/src/libs/softfloat-3e/source/f64_add.c
new file mode 100644
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+++ b/src/libs/softfloat-3e/source/f64_add.c
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+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3e, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions, and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions, and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+
+ 3. Neither the name of the University nor the names of its contributors may
+    be used to endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
+DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=============================================================================*/
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "softfloat.h"
+
+float64_t f64_add( float64_t a, float64_t b SOFTFLOAT_STATE_DECL_COMMA )
+{
+    union ui64_f64 uA;
+    uint_fast64_t uiA;
+    bool signA;
+    union ui64_f64 uB;
+    uint_fast64_t uiB;
+    bool signB;
+#if ! defined INLINE_LEVEL || (INLINE_LEVEL < 2)
+    float64_t (*magsFuncPtr)( uint_fast64_t, uint_fast64_t, bool SOFTFLOAT_STATE_DECL_COMMA );
+#endif
+
+    uA.f = a;
+    uiA = uA.ui;
+    signA = signF64UI( uiA );
+    uB.f = b;
+    uiB = uB.ui;
+    signB = signF64UI( uiB );
+#if defined INLINE_LEVEL && (2 <= INLINE_LEVEL)
+    if ( signA == signB ) {
+        return softfloat_addMagsF64( uiA, uiB, signA SOFTFLOAT_STATE_ARG_COMMA );
+    } else {
+        return softfloat_subMagsF64( uiA, uiB, signA SOFTFLOAT_STATE_ARG_COMMA );
+    }
+#else
+    magsFuncPtr =
+        (signA == signB) ? softfloat_addMagsF64 : softfloat_subMagsF64;
+    return (*magsFuncPtr)( uiA, uiB, signA SOFTFLOAT_STATE_ARG_COMMA );
+#endif
+
+}
+