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JITSubGenerator.cpp
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JavaScriptCore
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jit
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JITSubGenerator.cpp
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/*
* Copyright (C) 2015-2016 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.
*/
#
include
"
config.h
"
#
include
"
JITSubGenerator.h
"
#
include
"
ArithProfile.h
"
#
include
"
JITMathIC.h
"
#
if
ENABLE(JIT)
namespace
JSC
{
JITMathICInlineResult
JITSubGenerator::generateInline
(CCallHelpers& jit, MathICGenerationState& state,
const
BinaryArithProfile* arithProfile)
{
//
We default to speculating int32.
ObservedType lhs =
ObservedType
().
withInt32
();
ObservedType rhs =
ObservedType
().
withInt32
();
if
(arithProfile) {
lhs = arithProfile->
lhsObservedType
();
rhs = arithProfile->
rhsObservedType
();
}
if
(lhs.
isOnlyNonNumber
() && rhs.
isOnlyNonNumber
())
return
JITMathICInlineResult::DontGenerate;
if
(lhs.
isOnlyNumber
() && rhs.
isOnlyNumber
()) {
if
(!m_leftOperand.
definitelyIsNumber
())
state.
slowPathJumps
.
append
(jit.
branchIfNotNumber
(m_left));
if
(!m_rightOperand.
definitelyIsNumber
())
state.
slowPathJumps
.
append
(jit.
branchIfNotNumber
(m_right));
state.
slowPathJumps
.
append
(jit.
branchIfInt32
(m_left));
state.
slowPathJumps
.
append
(jit.
branchIfInt32
(m_right));
jit.
unboxDoubleNonDestructive
(m_left, m_leftFPR, m_scratchGPR);
jit.
unboxDoubleNonDestructive
(m_right, m_rightFPR, m_scratchGPR);
jit.
subDouble
(m_rightFPR, m_leftFPR);
jit.
boxDouble
(m_leftFPR, m_result);
return
JITMathICInlineResult::GeneratedFastPath;
}
if
(lhs.
isOnlyInt32
() && rhs.
isOnlyInt32
()) {
ASSERT
(!m_leftOperand.
isConstInt32
() || !m_rightOperand.
isConstInt32
());
state.
slowPathJumps
.
append
(jit.
branchIfNotInt32
(m_left));
state.
slowPathJumps
.
append
(jit.
branchIfNotInt32
(m_right));
#
if
CPU(ARM64)
state.
slowPathJumps
.
append
(jit.
branchSub32
(CCallHelpers::Overflow, m_left.
payloadGPR
(), m_right.
payloadGPR
(), m_scratchGPR));
#
else
jit.
move
(m_left.
payloadGPR
(), m_scratchGPR);
state.
slowPathJumps
.
append
(jit.
branchSub32
(CCallHelpers::Overflow, m_right.
payloadGPR
(), m_scratchGPR));
#
endif
jit.
boxInt32
(m_scratchGPR, m_result);
return
JITMathICInlineResult::GeneratedFastPath;
}
return
JITMathICInlineResult::GenerateFullSnippet;
}
bool
JITSubGenerator::generateFastPath
(CCallHelpers& jit, CCallHelpers::JumpList& endJumpList, CCallHelpers::JumpList& slowPathJumpList,
const
BinaryArithProfile* arithProfile,
bool
shouldEmitProfiling)
{
ASSERT
(m_scratchGPR != InvalidGPRReg);
ASSERT
(m_scratchGPR != m_left.
payloadGPR
());
ASSERT
(m_scratchGPR != m_right.
payloadGPR
());
CCallHelpers::Jump leftNotInt = jit.
branchIfNotInt32
(m_left);
CCallHelpers::Jump rightNotInt = jit.
branchIfNotInt32
(m_right);
#
if
CPU(ARM64)
slowPathJumpList.
append
(jit.
branchSub32
(CCallHelpers::Overflow, m_left.
payloadGPR
(), m_right.
payloadGPR
(), m_scratchGPR));
#
else
jit.
move
(m_left.
payloadGPR
(), m_scratchGPR);
slowPathJumpList.
append
(jit.
branchSub32
(CCallHelpers::Overflow, m_right.
payloadGPR
(), m_scratchGPR));
#
endif
jit.
boxInt32
(m_scratchGPR, m_result);
endJumpList.
append
(jit.
jump
());
leftNotInt.
link
(&jit);
if
(!m_leftOperand.
definitelyIsNumber
())
slowPathJumpList.
append
(jit.
branchIfNotNumber
(m_left));
if
(!m_rightOperand.
definitelyIsNumber
())
slowPathJumpList.
append
(jit.
branchIfNotNumber
(m_right));
jit.
unboxDoubleNonDestructive
(m_left, m_leftFPR, m_scratchGPR);
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
())
slowPathJumpList.
append
(jit.
branchIfNotNumber
(m_right));
jit.
convertInt32ToDouble
(m_left.
payloadGPR
(), m_leftFPR);
rightIsDouble.
link
(&jit);
jit.
unboxDoubleNonDestructive
(m_right, m_rightFPR, m_scratchGPR);
rightWasInteger.
link
(&jit);
jit.
subDouble
(m_rightFPR, m_leftFPR);
if
(arithProfile && shouldEmitProfiling)
arithProfile->
emitSetDouble
(jit, m_scratchGPR);
jit.
boxDouble
(m_leftFPR, m_result);
return
true
;
}
}
//
namespace JSC
#
endif
//
ENABLE(JIT)
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