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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 "JITMulGenerator.h"
#if ENABLE(JIT)
#include "ArithProfile.h"
#include "JITMathIC.h"
namespace JSC {
JITMathICInlineResult JITMulGenerator::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() && !m_leftOperand.isConst() && !m_rightOperand.isConst()) {
if (!jit.supportsFloatingPoint())
return JITMathICInlineResult::DontGenerate;
ASSERT(m_left);
ASSERT(m_right);
if (!m_leftOperand.definitelyIsNumber())
state.slowPathJumps.append(jit.branchIfNotNumber(m_left, m_scratchGPR));
if (!m_rightOperand.definitelyIsNumber())
state.slowPathJumps.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
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.mulDouble(m_rightFPR, m_leftFPR);
jit.boxDouble(m_leftFPR, m_result);
return JITMathICInlineResult::GeneratedFastPath;
}
if ((lhs.isOnlyInt32() || m_leftOperand.isPositiveConstInt32()) && (rhs.isOnlyInt32() || m_rightOperand.isPositiveConstInt32())) {
ASSERT(!m_leftOperand.isPositiveConstInt32() || !m_rightOperand.isPositiveConstInt32());
if (!m_leftOperand.isPositiveConstInt32())
state.slowPathJumps.append(jit.branchIfNotInt32(m_left));
if (!m_rightOperand.isPositiveConstInt32())
state.slowPathJumps.append(jit.branchIfNotInt32(m_right));
if (m_leftOperand.isPositiveConstInt32() || m_rightOperand.isPositiveConstInt32()) {
JSValueRegs var = m_leftOperand.isPositiveConstInt32() ? m_right : m_left;
int32_t constValue = m_leftOperand.isPositiveConstInt32() ? m_leftOperand.asConstInt32() : m_rightOperand.asConstInt32();
state.slowPathJumps.append(jit.branchMul32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constValue), m_scratchGPR));
} else {
state.slowPathJumps.append(jit.branchMul32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.payloadGPR(), m_scratchGPR));
state.slowPathJumps.append(jit.branchTest32(CCallHelpers::Zero, m_scratchGPR)); // Go slow if potential negative zero.
}
jit.boxInt32(m_scratchGPR, m_result);
return JITMathICInlineResult::GeneratedFastPath;
}
return JITMathICInlineResult::GenerateFullSnippet;
}
bool JITMulGenerator::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());
#if USE(JSVALUE64)
ASSERT(m_scratchGPR != m_result.payloadGPR());
#else
ASSERT(m_scratchGPR != m_left.tagGPR());
ASSERT(m_scratchGPR != m_right.tagGPR());
#endif
ASSERT(!m_leftOperand.isPositiveConstInt32() || !m_rightOperand.isPositiveConstInt32());
if (!m_leftOperand.mightBeNumber() || !m_rightOperand.mightBeNumber())
return false;
if (m_leftOperand.isPositiveConstInt32() || m_rightOperand.isPositiveConstInt32()) {
JSValueRegs var = m_leftOperand.isPositiveConstInt32() ? m_right : m_left;
SnippetOperand& varOpr = m_leftOperand.isPositiveConstInt32() ? m_rightOperand : m_leftOperand;
SnippetOperand& constOpr = m_leftOperand.isPositiveConstInt32() ? m_leftOperand : m_rightOperand;
// Try to do intVar * intConstant.
CCallHelpers::Jump notInt32 = jit.branchIfNotInt32(var);
GPRReg multiplyResultGPR = m_result.payloadGPR();
if (multiplyResultGPR == var.payloadGPR())
multiplyResultGPR = m_scratchGPR;
slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, var.payloadGPR(), CCallHelpers::Imm32(constOpr.asConstInt32()), multiplyResultGPR));
jit.boxInt32(multiplyResultGPR, m_result);
endJumpList.append(jit.jump());
if (!jit.supportsFloatingPoint()) {
slowPathJumpList.append(notInt32);
return true;
}
// Try to do doubleVar * double(intConstant).
notInt32.link(&jit);
if (!varOpr.definitelyIsNumber())
slowPathJumpList.append(jit.branchIfNotNumber(var, m_scratchGPR));
jit.unboxDoubleNonDestructive(var, m_leftFPR, m_scratchGPR);
jit.move(CCallHelpers::Imm32(constOpr.asConstInt32()), m_scratchGPR);
jit.convertInt32ToDouble(m_scratchGPR, m_rightFPR);
// Fall thru to doubleVar * doubleVar.
} else {
ASSERT(!m_leftOperand.isPositiveConstInt32() && !m_rightOperand.isPositiveConstInt32());
CCallHelpers::Jump leftNotInt;
CCallHelpers::Jump rightNotInt;
// Try to do intVar * intVar.
leftNotInt = jit.branchIfNotInt32(m_left);
rightNotInt = jit.branchIfNotInt32(m_right);
slowPathJumpList.append(jit.branchMul32(CCallHelpers::Overflow, m_right.payloadGPR(), m_left.payloadGPR(), m_scratchGPR));
slowPathJumpList.append(jit.branchTest32(CCallHelpers::Zero, m_scratchGPR)); // Go slow if potential negative zero.
jit.boxInt32(m_scratchGPR, m_result);
endJumpList.append(jit.jump());
if (!jit.supportsFloatingPoint()) {
slowPathJumpList.append(leftNotInt);
slowPathJumpList.append(rightNotInt);
return true;
}
leftNotInt.link(&jit);
if (!m_leftOperand.definitelyIsNumber())
slowPathJumpList.append(jit.branchIfNotNumber(m_left, m_scratchGPR));
if (!m_rightOperand.definitelyIsNumber())
slowPathJumpList.append(jit.branchIfNotNumber(m_right, m_scratchGPR));
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, m_scratchGPR));
jit.convertInt32ToDouble(m_left.payloadGPR(), m_leftFPR);
rightIsDouble.link(&jit);
jit.unboxDoubleNonDestructive(m_right, m_rightFPR, m_scratchGPR);
rightWasInteger.link(&jit);
// Fall thru to doubleVar * doubleVar.
}
// Do doubleVar * doubleVar.
jit.mulDouble(m_rightFPR, m_leftFPR);
if (!arithProfile || !shouldEmitProfiling)
jit.boxDouble(m_leftFPR, m_result);
else {
// The Int52 overflow check below intentionally omits 1ll << 51 as a valid negative Int52 value.
// Therefore, we will get a false positive if the result is that value. This is intentionally
// done to simplify the checking algorithm.
const int64_t negativeZeroBits = 1ll << 63;
#if USE(JSVALUE64)
jit.moveDoubleTo64(m_leftFPR, m_result.payloadGPR());
CCallHelpers::Jump notNegativeZero = jit.branch64(CCallHelpers::NotEqual, m_result.payloadGPR(), CCallHelpers::TrustedImm64(negativeZeroBits));
arithProfile->emitUnconditionalSet(jit, ObservedResults::NegZeroDouble);
CCallHelpers::Jump done = jit.jump();
notNegativeZero.link(&jit);
arithProfile->emitUnconditionalSet(jit, ObservedResults::NonNegZeroDouble);
jit.move(m_result.payloadGPR(), m_scratchGPR);
jit.urshiftPtr(CCallHelpers::Imm32(52), m_scratchGPR);
jit.and32(CCallHelpers::Imm32(0x7ff), m_scratchGPR);
CCallHelpers::Jump noInt52Overflow = jit.branch32(CCallHelpers::LessThanOrEqual, m_scratchGPR, CCallHelpers::TrustedImm32(0x431));
arithProfile->emitUnconditionalSet(jit, ObservedResults::Int52Overflow);
noInt52Overflow.link(&jit);
done.link(&jit);
jit.sub64(GPRInfo::numberTagRegister, m_result.payloadGPR()); // Box the double.
#else
jit.boxDouble(m_leftFPR, m_result);
CCallHelpers::JumpList notNegativeZero;
notNegativeZero.append(jit.branch32(CCallHelpers::NotEqual, m_result.payloadGPR(), CCallHelpers::TrustedImm32(0)));
notNegativeZero.append(jit.branch32(CCallHelpers::NotEqual, m_result.tagGPR(), CCallHelpers::TrustedImm32(negativeZeroBits >> 32)));
arithProfile->emitUnconditionalSet(jit, ObservedResults::NegZeroDouble);
CCallHelpers::Jump done = jit.jump();
notNegativeZero.link(&jit);
arithProfile->emitUnconditionalSet(jit, ObservedResults::NonNegZeroDouble);
jit.move(m_result.tagGPR(), m_scratchGPR);
jit.urshiftPtr(CCallHelpers::Imm32(52 - 32), m_scratchGPR);
jit.and32(CCallHelpers::Imm32(0x7ff), m_scratchGPR);
CCallHelpers::Jump noInt52Overflow = jit.branch32(CCallHelpers::LessThanOrEqual, m_scratchGPR, CCallHelpers::TrustedImm32(0x431));
arithProfile->emitUnconditionalSet(jit, ObservedResults::Int52Overflow);
endJumpList.append(noInt52Overflow);
if (m_scratchGPR == m_result.tagGPR() || m_scratchGPR == m_result.payloadGPR())
jit.boxDouble(m_leftFPR, m_result);
endJumpList.append(done);
#endif
}
return true;
}
} // namespace JSC
#endif // ENABLE(JIT)
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