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/*
* Copyright (C) 2015 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.
*/
#include "config.h"
#include "JITSubGenerator.h"
#if ENABLE(JIT)
namespace JSC {
void JITSubGenerator::generateFastPath(CCallHelpers& jit)
{
ASSERT(m_scratchGPR != InvalidGPRReg);
ASSERT(m_scratchGPR != m_left.payloadGPR());
ASSERT(m_scratchGPR != m_right.payloadGPR());
#if USE(JSVALUE32_64)
ASSERT(m_scratchGPR != m_left.tagGPR());
ASSERT(m_scratchGPR != m_right.tagGPR());
ASSERT(m_scratchFPR != InvalidFPRReg);
#endif
m_didEmitFastPath = true;
CCallHelpers::Jump leftNotInt = jit.branchIfNotInt32(m_left);
CCallHelpers::Jump rightNotInt = jit.branchIfNotInt32(m_right);
jit.move(m_left.payloadGPR(), m_scratchGPR);
m_slowPathJumpList.append(jit.branchSub32(CCallHelpers::Overflow, m_right.payloadGPR(), m_scratchGPR));
jit.boxInt32(m_scratchGPR, m_result);
m_endJumpList.append(jit.jump());
if (!jit.supportsFloatingPoint()) {
m_slowPathJumpList.append(leftNotInt);
m_slowPathJumpList.append(rightNotInt);
return;
}
leftNotInt.link(&jit);
if (!m_leftOperand.definitelyIsNumber())
m_slowPathJumpList.append(jit.branchIfNotNumber(m_left, m_scratchGPR));
if (!m_rightOperand.definitelyIsNumber())
m_slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
jit.unboxDoubleNonDestructive(m_left, m_leftFPR, m_scratchGPR, m_scratchFPR);
CCallHelpers::Jump rightIsDouble = jit.branchIfNotInt32(m_right);
jit.convertInt32ToDouble(m_right.payloadGPR(), m_rightFPR);
CCallHelpers::Jump rightWasInteger = jit.jump();
rightNotInt.link(&jit);
if (!m_rightOperand.definitelyIsNumber())
m_slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
jit.convertInt32ToDouble(m_left.payloadGPR(), m_leftFPR);
rightIsDouble.link(&jit);
jit.unboxDoubleNonDestructive(m_right, m_rightFPR, m_scratchGPR, m_scratchFPR);
rightWasInteger.link(&jit);
jit.subDouble(m_rightFPR, m_leftFPR);
jit.boxDouble(m_leftFPR, m_result);
}
} // namespace JSC
#endif // ENABLE(JIT)
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