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Copy pathJITAddGenerator.cpp
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136 lines (104 loc) · 5.12 KB
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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 "JITAddGenerator.h"
#if ENABLE(JIT)
namespace JSC {
void JITAddGenerator::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
ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());
if (!m_leftOperand.mightBeNumber() || !m_rightOperand.mightBeNumber()) {
ASSERT(!m_didEmitFastPath);
return;
}
m_didEmitFastPath = true;
if (m_leftOperand.isConstInt32() || m_rightOperand.isConstInt32()) {
JSValueRegs var = m_leftOperand.isConstInt32() ? m_right : m_left;
SnippetOperand& varOpr = m_leftOperand.isConstInt32() ? m_rightOperand : m_leftOperand;
SnippetOperand& constOpr = m_leftOperand.isConstInt32() ? m_leftOperand : m_rightOperand;
// Try to do intVar + intConstant.
CCallHelpers::Jump notInt32 = jit.branchIfNotInt32(var);
m_slowPathJumpList.append(jit.branchAdd32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constOpr.asConstInt32()), m_scratchGPR));
jit.boxInt32(m_scratchGPR, m_result);
m_endJumpList.append(jit.jump());
if (!jit.supportsFloatingPoint()) {
m_slowPathJumpList.append(notInt32);
return;
}
// Try to do doubleVar + double(intConstant).
notInt32.link(&jit);
if (!varOpr.definitelyIsNumber())
m_slowPathJumpList.append(jit.branchIfNotNumber(var, m_scratchGPR));
jit.unboxDoubleNonDestructive(var, m_leftFPR, m_scratchGPR, m_scratchFPR);
jit.move(CCallHelpers::Imm32(constOpr.asConstInt32()), m_scratchGPR);
jit.convertInt32ToDouble(m_scratchGPR, m_rightFPR);
// Fall thru to doubleVar + doubleVar.
} else {
ASSERT(!m_leftOperand.isConstInt32() && !m_rightOperand.isConstInt32());
CCallHelpers::Jump leftNotInt;
CCallHelpers::Jump rightNotInt;
// Try to do intVar + intVar.
leftNotInt = jit.branchIfNotInt32(m_left);
rightNotInt = jit.branchIfNotInt32(m_right);
m_slowPathJumpList.append(jit.branchAdd32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.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);
// Fall thru to doubleVar + doubleVar.
}
// Do doubleVar + doubleVar.
jit.addDouble(m_rightFPR, m_leftFPR);
jit.boxDouble(m_leftFPR, m_result);
}
} // namespace JSC
#endif // ENABLE(JIT)