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/*
* Copyright (C) 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.
*/
#pragma once
namespace JSC {
namespace MacroAssemblerHelpers {
// True if this:
// branch8(cond, value, value)
// Is the same as this:
// branch32(cond, signExt8(value), signExt8(value))
template<typename MacroAssemblerType>
inline bool isSigned(typename MacroAssemblerType::RelationalCondition cond)
{
switch (cond) {
case MacroAssemblerType::Equal:
case MacroAssemblerType::NotEqual:
case MacroAssemblerType::GreaterThan:
case MacroAssemblerType::GreaterThanOrEqual:
case MacroAssemblerType::LessThan:
case MacroAssemblerType::LessThanOrEqual:
return true;
default:
return false;
}
}
// True if this:
// branch8(cond, value, value)
// Is the same as this:
// branch32(cond, zeroExt8(value), zeroExt8(value))
template<typename MacroAssemblerType>
inline bool isUnsigned(typename MacroAssemblerType::RelationalCondition cond)
{
switch (cond) {
case MacroAssemblerType::Equal:
case MacroAssemblerType::NotEqual:
case MacroAssemblerType::Above:
case MacroAssemblerType::AboveOrEqual:
case MacroAssemblerType::Below:
case MacroAssemblerType::BelowOrEqual:
return true;
default:
return false;
}
}
// True if this:
// test8(cond, value, value)
// Is the same as this:
// test32(cond, signExt8(value), signExt8(value))
template<typename MacroAssemblerType>
inline bool isSigned(typename MacroAssemblerType::ResultCondition cond)
{
switch (cond) {
case MacroAssemblerType::Signed:
case MacroAssemblerType::PositiveOrZero:
case MacroAssemblerType::Zero:
case MacroAssemblerType::NonZero:
return true;
default:
return false;
}
}
// True if this:
// test8(cond, value, value)
// Is the same as this:
// test32(cond, zeroExt8(value), zeroExt8(value))
template<typename MacroAssemblerType>
inline bool isUnsigned(typename MacroAssemblerType::ResultCondition cond)
{
switch (cond) {
case MacroAssemblerType::Zero:
case MacroAssemblerType::NonZero:
return true;
default:
return false;
}
}
template<typename MacroAssemblerType>
inline typename MacroAssemblerType::TrustedImm32 mask8OnCondition(MacroAssemblerType&, typename MacroAssemblerType::RelationalCondition cond, typename MacroAssemblerType::TrustedImm32 value)
{
if (isUnsigned<MacroAssemblerType>(cond))
return typename MacroAssemblerType::TrustedImm32(static_cast<uint8_t>(value.m_value));
return typename MacroAssemblerType::TrustedImm32(static_cast<int8_t>(value.m_value));
}
template<typename MacroAssemblerType>
inline typename MacroAssemblerType::TrustedImm32 mask8OnCondition(MacroAssemblerType&, typename MacroAssemblerType::ResultCondition cond, typename MacroAssemblerType::TrustedImm32 value)
{
// If condition is Zero or NonZero, upper bits are unrelated.
// Since branchTest32 handles -1 in an optimized manner, we keep -1 as is instead of converting it to 255.
if (cond == MacroAssemblerType::Zero || cond == MacroAssemblerType::NonZero) {
if (value.m_value == -1)
return value;
}
if (isUnsigned<MacroAssemblerType>(cond))
return typename MacroAssemblerType::TrustedImm32(static_cast<uint8_t>(value.m_value));
ASSERT_WITH_MESSAGE(cond != MacroAssemblerType::Overflow, "Overflow is not used for 8bit test operations.");
ASSERT(isSigned<MacroAssemblerType>(cond));
return typename MacroAssemblerType::TrustedImm32(static_cast<int8_t>(value.m_value));
}
template<typename MacroAssemblerType>
inline typename MacroAssemblerType::TrustedImm32 mask16OnCondition(MacroAssemblerType&, typename MacroAssemblerType::RelationalCondition cond, typename MacroAssemblerType::TrustedImm32 value)
{
if (isUnsigned<MacroAssemblerType>(cond))
return typename MacroAssemblerType::TrustedImm32(static_cast<uint16_t>(value.m_value));
return typename MacroAssemblerType::TrustedImm32(static_cast<int16_t>(value.m_value));
}
template<typename MacroAssemblerType>
inline typename MacroAssemblerType::TrustedImm32 mask16OnCondition(MacroAssemblerType&, typename MacroAssemblerType::ResultCondition cond, typename MacroAssemblerType::TrustedImm32 value)
{
// If condition is Zero or NonZero, upper bits are unrelated.
// Since branchTest32 handles -1 in an optimized manner, we keep -1 as is instead of converting it to 0xffff.
if (cond == MacroAssemblerType::Zero || cond == MacroAssemblerType::NonZero) {
if (value.m_value == -1)
return value;
}
if (isUnsigned<MacroAssemblerType>(cond))
return typename MacroAssemblerType::TrustedImm32(static_cast<uint16_t>(value.m_value));
ASSERT_WITH_MESSAGE(cond != MacroAssemblerType::Overflow, "Overflow is not used for 16bit test operations.");
ASSERT(isSigned<MacroAssemblerType>(cond));
return typename MacroAssemblerType::TrustedImm32(static_cast<int16_t>(value.m_value));
}
template<typename MacroAssemblerType, typename Condition, typename ...Args>
void load8OnCondition(MacroAssemblerType& jit, Condition cond, Args... args)
{
if (isUnsigned<MacroAssemblerType>(cond))
return jit.load8(std::forward<Args>(args)...);
return jit.load8SignedExtendTo32(std::forward<Args>(args)...);
}
template<typename MacroAssemblerType, typename Condition, typename ...Args>
void load16OnCondition(MacroAssemblerType& jit, Condition cond, Args... args)
{
if (isUnsigned<MacroAssemblerType>(cond))
return jit.load16(std::forward<Args>(args)...);
return jit.load16SignedExtendTo32(std::forward<Args>(args)...);
}
} } // namespace JSC
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