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/*
* Copyright (C) 2015-2020 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 "B3MathExtras.h"
#if ENABLE(B3_JIT)
#include "B3BasicBlockInlines.h"
#include "B3CCallValue.h"
#include "B3Const32Value.h"
#include "B3ConstDoubleValue.h"
#include "B3ConstPtrValue.h"
#include "B3UpsilonValue.h"
#include "B3ValueInlines.h"
#include "JSCPtrTag.h"
#include "MathCommon.h"
namespace JSC { namespace B3 {
std::pair<BasicBlock*, Value*> powDoubleInt32(Procedure& procedure, BasicBlock* start, Origin origin, Value* x, Value* y)
{
BasicBlock* functionCallCase = procedure.addBlock();
BasicBlock* loopPreHeaderCase = procedure.addBlock();
BasicBlock* loopTestForEvenCase = procedure.addBlock();
BasicBlock* loopOdd = procedure.addBlock();
BasicBlock* loopEvenOdd = procedure.addBlock();
BasicBlock* continuation = procedure.addBlock();
Value* shouldGoSlowPath = start->appendNew<Value>(procedure, Above, origin,
y,
start->appendNew<Const32Value>(procedure, origin, maxExponentForIntegerMathPow));
start->appendNew<Value>(procedure, Branch, origin, shouldGoSlowPath);
start->setSuccessors(FrequentedBlock(functionCallCase), FrequentedBlock(loopPreHeaderCase));
// Function call.
Value* yAsDouble = functionCallCase->appendNew<Value>(procedure, IToD, origin, y);
Value* powResult = functionCallCase->appendNew<CCallValue>(
procedure, Double, origin,
functionCallCase->appendNew<ConstPtrValue>(procedure, origin, std::bit_cast<void*>(tagCFunction<OperationPtrTag>(Math::stdPowDouble))),
x, yAsDouble);
UpsilonValue* powResultUpsilon = functionCallCase->appendNew<UpsilonValue>(procedure, origin, powResult);
functionCallCase->appendNew<Value>(procedure, Jump, origin);
functionCallCase->setSuccessors(FrequentedBlock(continuation));
// Loop pre-header.
Value* initialResult = loopPreHeaderCase->appendNew<ConstDoubleValue>(procedure, origin, 1.);
UpsilonValue* initialLoopValue = loopPreHeaderCase->appendNew<UpsilonValue>(procedure, origin, initialResult);
UpsilonValue* initialResultValue = loopPreHeaderCase->appendNew<UpsilonValue>(procedure, origin, initialResult);
UpsilonValue* initialSquaredInput = loopPreHeaderCase->appendNew<UpsilonValue>(procedure, origin, x);
UpsilonValue* initialLoopCounter = loopPreHeaderCase->appendNew<UpsilonValue>(procedure, origin, y);
loopPreHeaderCase->appendNew<Value>(procedure, Jump, origin);
loopPreHeaderCase->setSuccessors(FrequentedBlock(loopTestForEvenCase));
// Test if what is left of the counter is even.
Value* inLoopCounter = loopTestForEvenCase->appendNew<Value>(procedure, Phi, Int32, origin);
Value* inLoopSquaredInput = loopTestForEvenCase->appendNew<Value>(procedure, Phi, Double, origin);
Value* lastCounterBit = loopTestForEvenCase->appendNew<Value>(procedure, BitAnd, origin,
inLoopCounter,
loopTestForEvenCase->appendNew<Const32Value>(procedure, origin, 1));
loopTestForEvenCase->appendNew<Value>(procedure, Branch, origin, lastCounterBit);
loopTestForEvenCase->setSuccessors(FrequentedBlock(loopOdd), FrequentedBlock(loopEvenOdd));
// Counter is odd.
Value* inLoopResult = loopOdd->appendNew<Value>(procedure, Phi, Double, origin);
Value* updatedResult = loopOdd->appendNew<Value>(procedure, Mul, origin, inLoopResult, inLoopSquaredInput);
UpsilonValue* updatedLoopResultUpsilon = loopOdd->appendNew<UpsilonValue>(procedure, origin, updatedResult);
initialLoopValue->setPhi(inLoopResult);
updatedLoopResultUpsilon->setPhi(inLoopResult);
UpsilonValue* updatedLoopResult = loopOdd->appendNew<UpsilonValue>(procedure, origin, updatedResult);
loopOdd->appendNew<Value>(procedure, Jump, origin);
loopOdd->setSuccessors(FrequentedBlock(loopEvenOdd));
// Even value and following the Odd.
Value* squaredInput = loopEvenOdd->appendNew<Value>(procedure, Mul, origin, inLoopSquaredInput, inLoopSquaredInput);
UpsilonValue* squaredInputUpsilon = loopEvenOdd->appendNew<UpsilonValue>(procedure, origin, squaredInput);
initialSquaredInput->setPhi(inLoopSquaredInput);
squaredInputUpsilon->setPhi(inLoopSquaredInput);
Value* updatedCounter = loopEvenOdd->appendNew<Value>(procedure, ZShr, origin,
inLoopCounter,
loopEvenOdd->appendNew<Const32Value>(procedure, origin, 1));
UpsilonValue* updatedCounterUpsilon = loopEvenOdd->appendNew<UpsilonValue>(procedure, origin, updatedCounter);
initialLoopCounter->setPhi(inLoopCounter);
updatedCounterUpsilon->setPhi(inLoopCounter);
loopEvenOdd->appendNew<Value>(procedure, Branch, origin, updatedCounter);
loopEvenOdd->setSuccessors(FrequentedBlock(loopTestForEvenCase), FrequentedBlock(continuation));
// Inline loop.
Value* finalResultPhi = continuation->appendNew<Value>(procedure, Phi, Double, origin);
powResultUpsilon->setPhi(finalResultPhi);
initialResultValue->setPhi(finalResultPhi);
updatedLoopResult->setPhi(finalResultPhi);
return std::make_pair(continuation, finalResultPhi);
}
} } // namespace JSC::B3
#endif // ENABLE(B3_JIT)
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