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diff --git a/softfloat/opts-GCC.h b/softfloat/opts-GCC.h
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+
+/*============================================================================
+
+This C header file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3e, by John R. Hauser.
+
+Copyright 2017 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.
+
+=============================================================================*/
+
+#ifndef opts_GCC_h
+#define opts_GCC_h 1
+
+#ifdef INLINE
+
+#include <stdint.h>
+#include "primitiveTypes.h"
+
+#ifdef SOFTFLOAT_BUILTIN_CLZ
+
+INLINE uint_fast8_t softfloat_countLeadingZeros16( uint16_t a )
+    { return a ? __builtin_clz( a ) - 16 : 16; }
+#define softfloat_countLeadingZeros16 softfloat_countLeadingZeros16
+
+INLINE uint_fast8_t softfloat_countLeadingZeros32( uint32_t a )
+    { return a ? __builtin_clz( a ) : 32; }
+#define softfloat_countLeadingZeros32 softfloat_countLeadingZeros32
+
+INLINE uint_fast8_t softfloat_countLeadingZeros64( uint64_t a )
+    { return a ? __builtin_clzll( a ) : 64; }
+#define softfloat_countLeadingZeros64 softfloat_countLeadingZeros64
+
+#endif
+
+#ifdef SOFTFLOAT_INTRINSIC_INT128
+
+INLINE struct uint128 softfloat_mul64ByShifted32To128( uint64_t a, uint32_t b )
+{
+    union { unsigned __int128 ui; struct uint128 s; } uZ;
+    uZ.ui = (unsigned __int128) a * ((uint_fast64_t) b<<32);
+    return uZ.s;
+}
+#define softfloat_mul64ByShifted32To128 softfloat_mul64ByShifted32To128
+
+INLINE struct uint128 softfloat_mul64To128( uint64_t a, uint64_t b )
+{
+    union { unsigned __int128 ui; struct uint128 s; } uZ;
+    uZ.ui = (unsigned __int128) a * b;
+    return uZ.s;
+}
+#define softfloat_mul64To128 softfloat_mul64To128
+
+INLINE
+struct uint128 softfloat_mul128By32( uint64_t a64, uint64_t a0, uint32_t b )
+{
+    union { unsigned __int128 ui; struct uint128 s; } uZ;
+    uZ.ui = ((unsigned __int128) a64<<64 | a0) * b;
+    return uZ.s;
+}
+#define softfloat_mul128By32 softfloat_mul128By32
+
+INLINE
+void
+ softfloat_mul128To256M(
+     uint64_t a64, uint64_t a0, uint64_t b64, uint64_t b0, uint64_t *zPtr )
+{
+    unsigned __int128 z0, mid1, mid, z128;
+    z0 = (unsigned __int128) a0 * b0;
+    mid1 = (unsigned __int128) a64 * b0;
+    mid = mid1 + (unsigned __int128) a0 * b64;
+    z128 = (unsigned __int128) a64 * b64;
+    z128 += (unsigned __int128) (mid < mid1)<<64 | mid>>64;
+    mid <<= 64;
+    z0 += mid;
+    z128 += (z0 < mid);
+    zPtr[indexWord( 4, 0 )] = z0;
+    zPtr[indexWord( 4, 1 )] = z0>>64;
+    zPtr[indexWord( 4, 2 )] = z128;
+    zPtr[indexWord( 4, 3 )] = z128>>64;
+}
+#define softfloat_mul128To256M softfloat_mul128To256M
+
+#endif
+
+#endif
+
+#endif
+