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Copy pathJITRightShiftGenerator.cpp
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122 lines (106 loc) · 4.67 KB
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/*
* Copyright (C) 2015-2019 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 "JITRightShiftGenerator.h"
#if ENABLE(JIT)
namespace JSC {
void JITRightShiftGenerator::generateFastPath(CCallHelpers& jit)
{
ASSERT(m_scratchGPR != InvalidGPRReg);
ASSERT(m_scratchGPR != m_left);
ASSERT(m_scratchGPR != m_right);
ASSERT(!m_leftOperand.isConstInt32() || !m_rightOperand.isConstInt32());
m_didEmitFastPath = true;
if (m_rightOperand.isConstInt32()) {
// Try to do (intVar >> intConstant).
CCallHelpers::Jump notInt = jit.branchIfNotInt32(m_left);
int32_t shiftAmount = m_rightOperand.asConstInt32() & 0x1f;
if (shiftAmount) {
if (m_shiftType == SignedShift)
jit.rshift32(m_left, CCallHelpers::Imm32(shiftAmount), m_result);
else
jit.urshift32(m_left, CCallHelpers::Imm32(shiftAmount), m_result);
jit.boxInt32(m_result, m_result);
} else
jit.move(m_left, m_result);
m_endJumpList.append(jit.jump()); // Terminate the above case before emitting more code.
// Try to do (doubleVar >> intConstant).
notInt.link(&jit);
m_slowPathJumpList.append(jit.branchIfNotNumber(m_left));
jit.unboxDouble(m_left, m_scratchGPR, m_leftFPR);
#if CPU(ARM64)
if (MacroAssemblerARM64::supportsDoubleToInt32ConversionUsingJavaScriptSemantics())
jit.convertDoubleToInt32UsingJavaScriptSemantics(m_leftFPR, m_scratchGPR);
else
#endif
{
m_slowPathJumpList.append(jit.branchTruncateDoubleToInt32(m_leftFPR, m_scratchGPR));
}
if (shiftAmount) {
if (m_shiftType == SignedShift)
jit.rshift32(CCallHelpers::Imm32(shiftAmount), m_scratchGPR);
else
jit.urshift32(CCallHelpers::Imm32(shiftAmount), m_scratchGPR);
}
jit.boxInt32(m_scratchGPR, m_result);
return;
}
// Try to do (intConstant >> intVar) or (intVar >> intVar).
m_slowPathJumpList.append(jit.branchIfNotInt32(m_right));
if (m_leftOperand.isConstInt32()) {
if (m_shiftType == SignedShift)
jit.rshift32(CCallHelpers::Imm32(m_leftOperand.asConstInt32()), m_right, m_result);
else
jit.urshift32(CCallHelpers::Imm32(m_leftOperand.asConstInt32()), m_right, m_result);
jit.boxInt32(m_result, m_result);
return;
}
CCallHelpers::Jump leftNotInt = jit.branchIfNotInt32(m_left);
if (m_shiftType == SignedShift)
jit.rshift32(m_left, m_right, m_result);
else
jit.urshift32(m_left, m_right, m_result);
jit.boxInt32(m_result, m_result);
m_endJumpList.append(jit.jump()); // Terminate the above case before emitting more code.
// Try to do (doubleVar >> intVar).
leftNotInt.link(&jit);
m_slowPathJumpList.append(jit.branchIfNotNumber(m_left));
jit.unboxDouble(m_left, m_scratchGPR, m_leftFPR);
#if CPU(ARM64)
if (MacroAssemblerARM64::supportsDoubleToInt32ConversionUsingJavaScriptSemantics())
jit.convertDoubleToInt32UsingJavaScriptSemantics(m_leftFPR, m_scratchGPR);
else
#endif
{
m_slowPathJumpList.append(jit.branchTruncateDoubleToInt32(m_leftFPR, m_scratchGPR));
}
if (m_shiftType == SignedShift)
jit.rshift32(m_right, m_scratchGPR);
else
jit.urshift32(m_right, m_scratchGPR);
jit.boxInt32(m_scratchGPR, m_result);
}
} // namespace JSC
#endif // ENABLE(JIT)