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//
// Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#include "compiler/translator/LoopInfo.h"
namespace
{
int EvaluateIntConstant(TIntermConstantUnion *node)
{
ASSERT(node && node->getUnionArrayPointer());
return node->getIConst(0);
}
int GetLoopIntIncrement(TIntermLoop *node)
{
TIntermNode *expr = node->getExpression();
// for expression has one of the following forms:
// loop_index++
// loop_index--
// loop_index += constant_expression
// loop_index -= constant_expression
// ++loop_index
// --loop_index
// The last two forms are not specified in the spec, but I am assuming
// its an oversight.
TIntermUnary *unOp = expr->getAsUnaryNode();
TIntermBinary *binOp = unOp ? NULL : expr->getAsBinaryNode();
TOperator op = EOpNull;
TIntermConstantUnion *incrementNode = NULL;
if (unOp)
{
op = unOp->getOp();
}
else if (binOp)
{
op = binOp->getOp();
ASSERT(binOp->getRight());
incrementNode = binOp->getRight()->getAsConstantUnion();
ASSERT(incrementNode);
}
int increment = 0;
// The operator is one of: ++ -- += -=.
switch (op)
{
case EOpPostIncrement:
case EOpPreIncrement:
ASSERT(unOp && !binOp);
increment = 1;
break;
case EOpPostDecrement:
case EOpPreDecrement:
ASSERT(unOp && !binOp);
increment = -1;
break;
case EOpAddAssign:
ASSERT(!unOp && binOp);
increment = EvaluateIntConstant(incrementNode);
break;
case EOpSubAssign:
ASSERT(!unOp && binOp);
increment = - EvaluateIntConstant(incrementNode);
break;
default:
UNREACHABLE();
}
return increment;
}
} // namespace anonymous
TLoopIndexInfo::TLoopIndexInfo()
: mId(-1),
mType(EbtVoid),
mInitValue(0),
mStopValue(0),
mIncrementValue(0),
mOp(EOpNull),
mCurrentValue(0)
{
}
void TLoopIndexInfo::fillInfo(TIntermLoop *node)
{
if (node == NULL)
return;
// Here we assume all the operations are valid, because the loop node is
// already validated in ValidateLimitations.
TIntermSequence *declSeq =
node->getInit()->getAsAggregate()->getSequence();
TIntermBinary *declInit = (*declSeq)[0]->getAsBinaryNode();
TIntermSymbol *symbol = declInit->getLeft()->getAsSymbolNode();
mId = symbol->getId();
mType = symbol->getBasicType();
if (mType == EbtInt)
{
TIntermConstantUnion* initNode = declInit->getRight()->getAsConstantUnion();
mInitValue = EvaluateIntConstant(initNode);
mCurrentValue = mInitValue;
mIncrementValue = GetLoopIntIncrement(node);
TIntermBinary* binOp = node->getCondition()->getAsBinaryNode();
mStopValue = EvaluateIntConstant(
binOp->getRight()->getAsConstantUnion());
mOp = binOp->getOp();
}
}
bool TLoopIndexInfo::satisfiesLoopCondition() const
{
// Relational operator is one of: > >= < <= == or !=.
switch (mOp)
{
case EOpEqual:
return (mCurrentValue == mStopValue);
case EOpNotEqual:
return (mCurrentValue != mStopValue);
case EOpLessThan:
return (mCurrentValue < mStopValue);
case EOpGreaterThan:
return (mCurrentValue > mStopValue);
case EOpLessThanEqual:
return (mCurrentValue <= mStopValue);
case EOpGreaterThanEqual:
return (mCurrentValue >= mStopValue);
default:
UNREACHABLE();
return false;
}
}
TLoopInfo::TLoopInfo()
: loop(NULL)
{
}
TLoopInfo::TLoopInfo(TIntermLoop *node)
: loop(node)
{
index.fillInfo(node);
}
TIntermLoop *TLoopStack::findLoop(TIntermSymbol *symbol)
{
if (!symbol)
return NULL;
for (iterator iter = begin(); iter != end(); ++iter)
{
if (iter->index.getId() == symbol->getId())
return iter->loop;
}
return NULL;
}
TLoopIndexInfo *TLoopStack::getIndexInfo(TIntermSymbol *symbol)
{
if (!symbol)
return NULL;
for (iterator iter = begin(); iter != end(); ++iter)
{
if (iter->index.getId() == symbol->getId())
return &(iter->index);
}
return NULL;
}
void TLoopStack::step()
{
ASSERT(!empty());
rbegin()->index.step();
}
bool TLoopStack::satisfiesLoopCondition()
{
ASSERT(!empty());
return rbegin()->index.satisfiesLoopCondition();
}
bool TLoopStack::needsToReplaceSymbolWithValue(TIntermSymbol *symbol)
{
TIntermLoop *loop = findLoop(symbol);
return loop && loop->getUnrollFlag();
}
int TLoopStack::getLoopIndexValue(TIntermSymbol *symbol)
{
TLoopIndexInfo *info = getIndexInfo(symbol);
ASSERT(info);
return info->getCurrentValue();
}
void TLoopStack::push(TIntermLoop *loop)
{
TLoopInfo info(loop);
push_back(info);
}
void TLoopStack::pop()
{
pop_back();
}
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