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JITRightShiftGenerator.cpp
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JITRightShiftGenerator.cpp
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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.
payloadGPR
());
ASSERT
(m_scratchGPR != m_right.
payloadGPR
());
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.
payloadGPR
(),
CCallHelpers::Imm32
(shiftAmount), m_result.
payloadGPR
());
else
jit.
urshift32
(m_left.
payloadGPR
(),
CCallHelpers::Imm32
(shiftAmount), m_result.
payloadGPR
());
jit.
boxInt32
(m_result.
payloadGPR
(), m_result);
}
else
jit.
moveValueRegs
(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.
unboxDoubleNonDestructive
(m_left, m_leftFPR, m_scratchGPR);
#
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.
payloadGPR
(), m_result.
payloadGPR
());
else
jit.
urshift32
(
CCallHelpers::Imm32
(m_leftOperand.
asConstInt32
()), m_right.
payloadGPR
(), m_result.
payloadGPR
());
jit.
boxInt32
(m_result.
payloadGPR
(), m_result);
return
;
}
CCallHelpers::Jump leftNotInt = jit.
branchIfNotInt32
(m_left);
if
(m_shiftType == SignedShift)
jit.
rshift32
(m_left.
payloadGPR
(), m_right.
payloadGPR
(), m_result.
payloadGPR
());
else
jit.
urshift32
(m_left.
payloadGPR
(), m_right.
payloadGPR
(), m_result.
payloadGPR
());
jit.
boxInt32
(m_result.
payloadGPR
(), 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.
unboxDoubleNonDestructive
(m_left, m_leftFPR, m_scratchGPR);
#
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.
payloadGPR
(), m_scratchGPR);
else
jit.
urshift32
(m_right.
payloadGPR
(), m_scratchGPR);
jit.
boxInt32
(m_scratchGPR, m_result);
}
}
//
namespace JSC
#
endif
//
ENABLE(JIT)
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