Source/JavaScriptCore/assembler/AssemblerCommon.h

/*
 * 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 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);
}

} // namespace JSC.

#endif // AssemblerCommon_h