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diff --git a/Source/JavaScriptCore/assembler/AssemblerCommon.h b/Source/JavaScriptCore/assembler/AssemblerCommon.h
deleted file mode 100644
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--- a/Source/JavaScriptCore/assembler/AssemblerCommon.h
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@@ -1,294 +0,0 @@
-/*
- * Copyright (C) 2012, 2014, 2016 Apple Inc. 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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 AssemblerCommon_h
-#define AssemblerCommon_h
-
-namespace JSC {
-
-ALWAYS_INLINE bool isIOS()
-{
-#if PLATFORM(IOS)
-    return true;
-#else
-    return false;
-#endif
-}
-
-ALWAYS_INLINE bool isInt9(int32_t value)
-{
-    return value == ((value << 23) >> 23);
-}
-
-template<typename Type>
-ALWAYS_INLINE bool isUInt12(Type value)
-{
-    return !(value & ~static_cast<Type>(0xfff));
-}
-
-template<int datasize>
-ALWAYS_INLINE bool isValidScaledUImm12(int32_t offset)
-{
-    int32_t maxPImm = 4095 * (datasize / 8);
-    if (offset < 0)
-        return false;
-    if (offset > maxPImm)
-        return false;
-    if (offset & ((datasize / 8) - 1))
-        return false;
-    return true;
-}
-
-ALWAYS_INLINE bool isValidSignedImm9(int32_t value)
-{
-    return isInt9(value);
-}
-
-class ARM64LogicalImmediate {
-public:
-    static ARM64LogicalImmediate create32(uint32_t value)
-    {
-        // Check for 0, -1 - these cannot be encoded.
-        if (!value || !~value)
-            return InvalidLogicalImmediate;
-
-        // First look for a 32-bit pattern, then for repeating 16-bit
-        // patterns, 8-bit, 4-bit, and finally 2-bit.
-
-        unsigned hsb, lsb;
-        bool inverted;
-        if (findBitRange<32>(value, hsb, lsb, inverted))
-            return encodeLogicalImmediate<32>(hsb, lsb, inverted);
-
-        if ((value & 0xffff) != (value >> 16))
-            return InvalidLogicalImmediate;
-        value &= 0xffff;
-
-        if (findBitRange<16>(value, hsb, lsb, inverted))
-            return encodeLogicalImmediate<16>(hsb, lsb, inverted);
-
-        if ((value & 0xff) != (value >> 8))
-            return InvalidLogicalImmediate;
-        value &= 0xff;
-
-        if (findBitRange<8>(value, hsb, lsb, inverted))
-            return encodeLogicalImmediate<8>(hsb, lsb, inverted);
-
-        if ((value & 0xf) != (value >> 4))
-            return InvalidLogicalImmediate;
-        value &= 0xf;
-
-        if (findBitRange<4>(value, hsb, lsb, inverted))
-            return encodeLogicalImmediate<4>(hsb, lsb, inverted);
-
-        if ((value & 0x3) != (value >> 2))
-            return InvalidLogicalImmediate;
-        value &= 0x3;
-
-        if (findBitRange<2>(value, hsb, lsb, inverted))
-            return encodeLogicalImmediate<2>(hsb, lsb, inverted);
-
-        return InvalidLogicalImmediate;
-    }
-
-    static ARM64LogicalImmediate create64(uint64_t value)
-    {
-        // Check for 0, -1 - these cannot be encoded.
-        if (!value || !~value)
-            return InvalidLogicalImmediate;
-
-        // Look for a contiguous bit range.
-        unsigned hsb, lsb;
-        bool inverted;
-        if (findBitRange<64>(value, hsb, lsb, inverted))
-            return encodeLogicalImmediate<64>(hsb, lsb, inverted);
-
-        // If the high & low 32 bits are equal, we can try for a 32-bit (or narrower) pattern.
-        if (static_cast<uint32_t>(value) == static_cast<uint32_t>(value >> 32))
-            return create32(static_cast<uint32_t>(value));
-        return InvalidLogicalImmediate;
-    }
-
-    int value() const
-    {
-        ASSERT(isValid());
-        return m_value;
-    }
-
-    bool isValid() const
-    {
-        return m_value != InvalidLogicalImmediate;
-    }
-
-    bool is64bit() const
-    {
-        return m_value & (1 << 12);
-    }
-
-private:
-    ARM64LogicalImmediate(int value)
-        : m_value(value)
-    {
-    }
-
-    // Generate a mask with bits in the range hsb..0 set, for example:
-    //   hsb:63 = 0xffffffffffffffff
-    //   hsb:42 = 0x000007ffffffffff
-    //   hsb: 0 = 0x0000000000000001
-    static uint64_t mask(unsigned hsb)
-    {
-        ASSERT(hsb < 64);
-        return 0xffffffffffffffffull >> (63 - hsb);
-    }
-
-    template<unsigned N>
-    static void partialHSB(uint64_t& value, unsigned&result)
-    {
-        if (value & (0xffffffffffffffffull << N)) {
-            result += N;
-            value >>= N;
-        }
-    }
-
-    // Find the bit number of the highest bit set in a non-zero value, for example:
-    //   0x8080808080808080 = hsb:63
-    //   0x0000000000000001 = hsb: 0
-    //   0x000007ffffe00000 = hsb:42
-    static unsigned highestSetBit(uint64_t value)
-    {
-        ASSERT(value);
-        unsigned hsb = 0;
-        partialHSB<32>(value, hsb);
-        partialHSB<16>(value, hsb);
-        partialHSB<8>(value, hsb);
-        partialHSB<4>(value, hsb);
-        partialHSB<2>(value, hsb);
-        partialHSB<1>(value, hsb);
-        return hsb;
-    }
-
-    // This function takes a value and a bit width, where value obeys the following constraints:
-    //   * bits outside of the width of the value must be zero.
-    //   * bits within the width of value must neither be all clear or all set.
-    // The input is inspected to detect values that consist of either two or three contiguous
-    // ranges of bits. The output range hsb..lsb will describe the second range of the value.
-    // if the range is set, inverted will be false, and if the range is clear, inverted will
-    // be true. For example (with width 8):
-    //   00001111 = hsb:3, lsb:0, inverted:false
-    //   11110000 = hsb:3, lsb:0, inverted:true
-    //   00111100 = hsb:5, lsb:2, inverted:false
-    //   11000011 = hsb:5, lsb:2, inverted:true
-    template<unsigned width>
-    static bool findBitRange(uint64_t value, unsigned& hsb, unsigned& lsb, bool& inverted)
-    {
-        ASSERT(value & mask(width - 1));
-        ASSERT(value != mask(width - 1));
-        ASSERT(!(value & ~mask(width - 1)));
-
-        // Detect cases where the top bit is set; if so, flip all the bits & set invert.
-        // This halves the number of patterns we need to look for.
-        const uint64_t msb = 1ull << (width - 1);
-        if ((inverted = (value & msb)))
-            value ^= mask(width - 1);
-
-        // Find the highest set bit in value, generate a corresponding mask & flip all
-        // bits under it.
-        hsb = highestSetBit(value);
-        value ^= mask(hsb);
-        if (!value) {
-            // If this cleared the value, then the range hsb..0 was all set.
-            lsb = 0;
-            return true;
-        }
-
-        // Try making one more mask, and flipping the bits!
-        lsb = highestSetBit(value);
-        value ^= mask(lsb);
-        if (!value) {
-            // Success - but lsb actually points to the hsb of a third range - add one
-            // to get to the lsb of the mid range.
-            ++lsb;
-            return true;
-        }
-
-        return false;
-    }
-
-    // Encodes the set of immN:immr:imms fields found in a logical immediate.
-    template<unsigned width>
-    static int encodeLogicalImmediate(unsigned hsb, unsigned lsb, bool inverted)
-    {
-        // Check width is a power of 2!
-        ASSERT(!(width & (width -1)));
-        ASSERT(width <= 64 && width >= 2);
-        ASSERT(hsb >= lsb);
-        ASSERT(hsb < width);
-
-        int immN = 0;
-        int imms = 0;
-        int immr = 0;
-
-        // For 64-bit values this is easy - just set immN to true, and imms just
-        // contains the bit number of the highest set bit of the set range. For
-        // values with narrower widths, these are encoded by a leading set of
-        // one bits, followed by a zero bit, followed by the remaining set of bits
-        // being the high bit of the range. For a 32-bit immediate there are no
-        // leading one bits, just a zero followed by a five bit number. For a
-        // 16-bit immediate there is one one bit, a zero bit, and then a four bit
-        // bit-position, etc.
-        if (width == 64)
-            immN = 1;
-        else
-            imms = 63 & ~(width + width - 1);
-
-        if (inverted) {
-            // if width is 64 & hsb is 62, then we have a value something like:
-            //   0x80000000ffffffff (in this case with lsb 32).
-            // The ror should be by 1, imms (effectively set width minus 1) is
-            // 32. Set width is full width minus cleared width.
-            immr = (width - 1) - hsb;
-            imms |= (width - ((hsb - lsb) + 1)) - 1;
-        } else {
-            // if width is 64 & hsb is 62, then we have a value something like:
-            //   0x7fffffff00000000 (in this case with lsb 32).
-            // The value is effectively rol'ed by lsb, which is equivalent to
-            // a ror by width - lsb (or 0, in the case where lsb is 0). imms
-            // is hsb - lsb.
-            immr = (width - lsb) & (width - 1);
-            imms |= hsb - lsb;
-        }
-
-        return immN << 12 | immr << 6 | imms;
-    }
-
-    static const int InvalidLogicalImmediate = -1;
-
-    int m_value;
-};
-
-
-} // namespace JSC.
-
-#endif // AssemblerCommon_h