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GeneralLoopUnroller.cpp
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/*******************************************************************************
* Copyright (c) 2000, 2020 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at http://eclipse.org/legal/epl-2.0
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "optimizer/GeneralLoopUnroller.hpp"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "codegen/RecognizedMethods.hpp"
#include "compile/Compilation.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "cs2/bitvectr.h"
#include "env/StackMemoryRegion.hpp"
#include "env/jittypes.h"
#include "il/AliasSetInterface.hpp"
#include "il/AutomaticSymbol.hpp"
#include "il/LabelSymbol.hpp"
#include "il/MethodSymbol.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/ResolvedMethodSymbol.hpp"
#include "il/TreeTop.hpp"
#include "infra/Cfg.hpp"
#include "infra/CfgEdge.hpp"
#include "infra/CfgNode.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/TransformUtil.hpp"
#include "ras/Debug.hpp"
#define OPT_DETAILS "O^O GENERAL LOOP UNROLLER: "
#define OPT_DETAILS1 "O^O ARRAY ALIASING REFINER: "
#define GET_CLONE_BLOCK(x) _blockMapper[_iteration%2][(x)->getNumber()]
#define SET_CLONE_BLOCK(x,y) _blockMapper[_iteration%2][(x)->getNumber()]=(y)
#define GET_CLONE_NODE(x) _nodeMapper[_iteration%2][(x)->getNumber()]
#define SET_CLONE_NODE(x,y) _nodeMapper[_iteration%2][(x)->getNumber()]=(y)
#define GET_PREV_CLONE_BLOCK(x) _blockMapper[(1+_iteration)%2][(x)->getNumber()]
#define GET_PREV_CLONE_NODE(x) _nodeMapper[(1+_iteration)%2][(x)->getNumber()]
#define CURRENT_MAPPER _iteration%2
#define CREATED_BY_GLU 9
// Aliasing based weight analysis
class LoopWeightProbe
{
public:
LoopWeightProbe(TR::Compilation *comp) :
_numUsed(0), _numKilled(0), _numMatConst(0), _numUnmatConst(0),
_numCalls(0), _numLeafRoutines(0), _numPureFunctions(0), _numBIFs(0),
_used(comp->allocator()), _defd(comp->allocator()) {}
uint32_t _numUsed;
uint32_t _numKilled;
uint32_t _numMatConst;
uint32_t _numUnmatConst;
uint32_t _numCalls;
uint32_t _numLeafRoutines;
uint32_t _numPureFunctions;
uint32_t _numBIFs; // Builtins; RecognizedMethods
TR::BitVector _used;
TR::BitVector _defd;
};
static TR::ILOpCodes getConstOpCode(TR::DataType type)
{
switch (type.getDataType())
{
case TR::Int8: return TR::bconst;
case TR::Int16: return TR::sconst;
case TR::Int32: return TR::iconst;
case TR::Int64: return TR::lconst;
case TR::Address: return TR::comp()->target().is64Bit() ? TR::lconst : TR::iconst;
default:
TR_ASSERT(false, "unsupported type");
return TR::iconst;
}
TR_ASSERT(false, "unsupported type");
return TR::iconst;
}
static TR_ScratchList<TR::CFGEdge> *join(TR_ScratchList<TR::CFGEdge> *to, TR_ScratchList<TR::CFGEdge> *from)
{
if (from == NULL)
return to;
if (to == NULL)
return from;
ListIterator<TR::CFGEdge> it(from);
for (TR::CFGEdge *edge = it.getCurrent(); edge; edge = it.getNext())
to->add(edge);
return to;
}
static TR_ScratchList<TR::CFGEdge> *findCorrespondingCFGEdges(TR_Structure *from, TR_Structure *to, TR::Compilation * comp)
{
if (from->asBlock())
{
TR::Block *block = from->asBlock()->getBlock();
for (auto edge = block->getSuccessors().begin(); edge != block->getSuccessors().end(); ++edge)
{
TR::Block *succ = toBlock((*edge)->getTo());
if (to->contains(succ->getStructureOf()))
return new (comp->trHeapMemory()) TR_ScratchList<TR::CFGEdge>(*edge, comp->trMemory());
}
return NULL;
}
else
{
TR_ScratchList<TR::CFGEdge> *edges = NULL;
TR_RegionStructure::Cursor it(*(from->asRegion()));
TR_StructureSubGraphNode *node;
for (node = it.getFirst(); node; node = it.getNext())
edges = join(edges, findCorrespondingCFGEdges(node->getStructure(), to, comp));
return edges;
}
}
static bool isBranchAtEndOfLoop(TR_RegionStructure *loop, TR::Block *branchBlock)
{
for (auto e = branchBlock->getSuccessors().begin(); e != branchBlock->getSuccessors().end(); ++e)
{
if ((*e)->getTo()->getNumber() == loop->getEntryBlock()->getNumber())
return true;
}
return false;
}
bool TR_LoopUnroller::nodeRefersToSymbol(TR::Node *node, TR::Symbol *sym)
{
if (!node) return false;
if (node->getOpCode().hasSymbolReference() && node->getSymbol() == sym)
return true;
for (int32_t child = 0; child < node->getNumChildren(); child++)
if (nodeRefersToSymbol(node->getChild(child), sym))
return true;
return false;
}
TR::Symbol *TR_LoopUnroller::findSymbolInTree(TR::Node *node)
{
if (!node) return NULL;
if (node->getOpCode().hasSymbolReference())
return node->getSymbol();
for (int32_t child = node->getNumChildren() - 1; child >= 0; child--)
{
TR::Symbol *sym;
if ((sym = findSymbolInTree(node->getChild(child))))
return sym;
}
return NULL;
}
static bool checkNodeFrequency(TR_StructureSubGraphNode *subNode, TR_RegionStructure *loop)
{
TR::Block *block = subNode->getStructure()->asBlock() != NULL ? subNode->getStructure()->asBlock()->getBlock() : NULL;
return !block || loop->getEntryBlock()->getFrequency() < 5000 || block->getFrequency() > 2000 || block->getFrequency() == -1;
}
static bool hasConnectableEdges(TR::Compilation *comp, TR_RegionStructure *loop)
{
if (!TR::isJ9() || comp->getOption(TR_DisableGLUColdRedirection))
return true;
TR_RegionStructure::Cursor nodeIt(*loop);
TR_StructureSubGraphNode *subNode;
bool connectable = false;
for (subNode = nodeIt.getFirst(); subNode; subNode = nodeIt.getNext())
{
for (auto edge = subNode->getSuccessors().begin(); edge != subNode->getSuccessors().end(); ++edge)
{
TR_StructureSubGraphNode *succ = toStructureSubGraphNode((*edge)->getTo());
if (succ == loop->getEntry())
{
if (checkNodeFrequency(subNode, loop))
{
connectable = true;
break;
}
}
}
}
return connectable;
}
bool TR_LoopUnroller::shouldConnectToNextIteration(TR_StructureSubGraphNode *subNode, TR_RegionStructure *loop)
{
if (!TR::isJ9() || comp()->getMethodHotness() <= warm || comp()->getOption(TR_DisableGLUColdRedirection))
return true;
if (!hasConnectableEdges(comp(), loop))
return true;
return _unrollKind == CompleteUnroll || isCountedLoop() || checkNodeFrequency(subNode, loop);
}
void TR_LoopUnroller::unrollLoopOnce(TR_RegionStructure *loop, TR_StructureSubGraphNode *branchNode,
bool finalUnroll)
{
TR_StructureSubGraphNode *newEntryNode = NULL;
//Reset the mappers.
memset(_blockMapper[CURRENT_MAPPER], 0, _numNodes * sizeof(TR::Block *));
memset( _nodeMapper[CURRENT_MAPPER], 0, _numNodes * sizeof(TR_StructureSubGraphNode *));
//First, clone all the original blocks in the loop
cloneBlocksInRegion(loop);
//Create duplicates of all sub structures in the loop
TR_RegionStructure::Cursor nodeIt(*loop);
TR_StructureSubGraphNode *subNode;
for (subNode = nodeIt.getFirst(); subNode; subNode = nodeIt.getNext())
{
if (subNode->getNumber() >= _numNodes)
continue; //clone only original nodes
//Clone all the substructures
TR_Structure *subStruct = subNode->getStructure();
TR_Structure *clonedSubStruct = cloneStructure(subStruct);
TR_StructureSubGraphNode *clonedSubNode = new (_cfg->structureRegion()) TR_StructureSubGraphNode(clonedSubStruct);
//Memorize the mapping between subNode and clonedSubNode
SET_CLONE_NODE(subNode, clonedSubNode);
//Add it to the loop
loop->addSubNode(clonedSubNode);
if (subNode == loop->getEntry())
newEntryNode = clonedSubNode;
}
//Fix all the exit edges in the subnodes
nodeIt.reset();
for (subNode = nodeIt.getFirst(); subNode; subNode = nodeIt.getNext())
{
if (subNode->getNumber() >= _numNodes)
continue;
TR_StructureSubGraphNode *clonedSubNode = GET_CLONE_NODE(subNode);
if (clonedSubNode)
/*GGLU*/
{
if (isCountedLoop())
fixExitEdges(subNode->getStructure(), clonedSubNode->getStructure());
else
fixExitEdges(subNode->getStructure(), clonedSubNode->getStructure(), branchNode);
}
}
if (_iteration == 1)
_firstEntryNode = newEntryNode;
//Now Fixup the structure edges
TR_StructureSubGraphNode *clonedBranchNode = GET_CLONE_NODE(branchNode);
/*GGLU*/
//First of all, remove the branch
bool branchAtEnd = true;
if (isCountedLoop())
{
// If the exit branch is in the middle of the loop and a complete unroll is going
// to happen, it is not valid to remove the branch for the last unroll (the top half
// of the loop maybe executed more number of times compared to the bottom half)
//
if (finalUnroll && _unrollKind == CompleteUnroll)
{
branchAtEnd = isBranchAtEndOfLoop(loop, branchNode->getStructure()->asBlock()->getBlock());
}
if (branchAtEnd)
clonedBranchNode->getStructure()->asBlock()->getBlock()->removeBranch(comp());
}
//Look at all the structures edges in the original loop, and create appropriate edges
//for each edge type (described below).
nodeIt.reset();
for (subNode = nodeIt.getFirst(); subNode; subNode = nodeIt.getNext())
{
if (subNode->getNumber() >= _numNodes)
continue;
TR_StructureSubGraphNode *clonedSubNode = GET_CLONE_NODE(subNode);
//Now iterate over all the edges originating from subnode and replicate
//them, if possible, for the clone
bool subNodeHasBackEdge = false;
for (auto edge = subNode->getSuccessors().begin(); edge != subNode->getSuccessors().end(); ++edge)
{
TR_StructureSubGraphNode *succ = toStructureSubGraphNode((*edge)->getTo());
if (succ == loop->getEntry())
{
subNodeHasBackEdge = true;
break;
}
}
for (auto edge = subNode->getSuccessors().begin(); edge != subNode->getSuccessors().end(); ++edge)
{
TR_StructureSubGraphNode *succ = toStructureSubGraphNode((*edge)->getTo());
TR_StructureSubGraphNode *clonedSucc = GET_CLONE_NODE(succ);
//Edges are classified into 4 Categories:
//A: exit edge originating from the branch node
//B: exit edge not originating from the branch node
//C: back edge to the entry node
//D: internal edges other than the backedges
if (subNode == branchNode && !clonedSucc) //Type A
{
/*GGLU*/
bool fixBranch = true;
if (isCountedLoop())
{
//nothing to do, removed branch above.
fixBranch = false;
//branch not removed if a complete unroll is being done
//and it is in the middle of the loop
if (finalUnroll && _unrollKind == CompleteUnroll && !branchAtEnd)
fixBranch = true;
}
if (fixBranch)
{
addExitEdgeAndFixEverything(loop, *edge, clonedSubNode);
}
}
else if (subNode != branchNode && !clonedSucc) //Type B
{
EdgeContext context = InvalidContext;
if (finalUnroll &&
(_unrollKind == CompleteUnroll) &&
subNodeHasBackEdge)
context = BackEdgeFromLastGenerationCompleteUnroll;
addExitEdgeAndFixEverything(loop, *edge, clonedSubNode, NULL, NULL, context);
}
else if (succ == loop->getEntry()) //Type C
{
//We have a backedge of the form Edge(A -> E).
//
//If this is the final unrolling, and we are not unrolling completely,
// add edges back to the original entry pt. (back edges to the true
// entry of the loop)
// ie, we must create (A' -> E) instead of (A' -> E').
//
//If this is the final unrolling, and We are going to unroll the loop
// completely, add (A' -> X) where X is the exit destination of the
// loop.
//
//For all iterations, except the first,
// add and edge from the previous generation's A to the entry
// point of this unrolling. ie. (A(prev) -> E(current))
//
if (finalUnroll)
{
if (_unrollKind != CompleteUnroll)
//Add an edge from the cloned subnode to the original entry
addEdgeAndFixEverything(loop, *edge, clonedSubNode, loop->getEntry(),
false, false, true, BackEdgeToEntry);
else
{
//add an edge to the exit destination
//(loop, edge, clonedSubnode, exitDestination, false, false, false,
// RedirectBackEdgeToExitDestination
redirectBackEdgeToExitDestination(loop, branchNode, clonedSubNode, (subNode != branchNode));
}
}
if (_iteration != 1) //for all iterations except the first iteration
{
if (shouldConnectToNextIteration(toStructureSubGraphNode(subNode), loop))
{
addEdgeAndFixEverything(loop, *edge, GET_PREV_CLONE_NODE(subNode), newEntryNode,
false, false, false, BackEdgeFromPrevGeneration);
}
else
{
if (trace())
traceMsg(comp(), "Redirecting cold edge from block_%d to unrolled loop header rather than going to the next iteration\n", subNode->getNumber());
addEdgeAndFixEverything(loop, *edge, GET_PREV_CLONE_NODE(subNode), loop->getEntry(),
false, false, true, BackEdgeToEntry);
}
}
}
else //Type D
{
addEdgeAndFixEverything(loop, *edge);
}
}
}
processSwingQueue();
if (trace())
{
traceMsg(comp(), "\nstructure after cloning the loop for the %dth time:\n\n", _iteration);
getDebug()->print(comp()->getOutFile(), _rootStructure, 6);
getDebug()->print(comp()->getOutFile(), _cfg);
comp()->dumpMethodTrees("method trees:");
}
//We are done.
}
void TR_LoopUnroller::redirectBackEdgeToExitDestination(TR_RegionStructure *loop,
TR_StructureSubGraphNode *branchNode,
TR_StructureSubGraphNode *fromNode,
bool notLoopBranchNode)
{
//Find the exit destination
TR::CFGEdge *exitEdge = NULL;
for (auto edge = branchNode->getSuccessors().begin(); (edge != branchNode->getSuccessors().end()) && exitEdge == NULL; ++edge)
{
if (loop->isExitEdge(*edge))
exitEdge = *edge;
}
//Add A->X*
addEdgeForSpillLoop
(loop, exitEdge, fromNode,
findNodeInHierarchy(loop->getParent()->asRegion(),
toStructureSubGraphNode(exitEdge->getTo())->getNumber()),
false,
BackEdgeFromLastGenerationCompleteUnroll,
notLoopBranchNode);
}
void TR_LoopUnroller::modifyBranchTree(TR_RegionStructure *loop,
TR_StructureSubGraphNode *loopNode,
TR_StructureSubGraphNode *branchNode)
{
TR_ASSERT(isCountedLoop() && _unrollKind != CompleteUnroll && _spillLoopRequired,
"GLU: modifying branch tree under wrong set of conditions");
TR::Block *branchBlock = branchNode->getStructure()->asBlock()->getBlock();
TR::Node *branch = branchBlock->getLastRealTreeTop()->getNode();
TR_RegionStructure *parent = loop->getParent()->asRegion();
TR_StructureSubGraphNode *predNode = toStructureSubGraphNode
(loopNode->getPredecessors().front()->getFrom());
TR_BlockStructure *predBlock = predNode->getStructure()->asBlock();
TR_ASSERT(predBlock, "Interesting... loop-invariant block is not a block");
TR::Block *pBlock = predBlock->getBlock();
// if the loop was the first block in the method, pBlock won't have real
// entry/exit trees. Add a dummy block at head
//
if (pBlock->getEntry() == 0)
{
TR::Block *newBlock = TR::Block::createEmptyBlock(branch, comp(), MAX_COLD_BLOCK_COUNT+1, pBlock); //branchBlock->getFrequency());
newBlock->getExit()->join(loop->getEntryBlock()->getEntry());
comp()->setStartTree(newBlock->getEntry());
_cfg->addNode(newBlock);
TR_BlockStructure *newBlockStr = new (_cfg->structureRegion()) TR_BlockStructure(comp(), newBlock->getNumber(), newBlock);
TR_StructureSubGraphNode *newNode = new (_cfg->structureRegion()) TR_StructureSubGraphNode(newBlockStr);
parent->addSubNode(newNode);
TR::CFGEdge *edgeToRemove = pBlock->getSuccessors().front();
_cfg->addEdge(TR::CFGEdge::createEdge(pBlock, newBlock, trMemory()));
TR::CFGEdge::createEdge(predNode, newNode, trMemory());
_cfg->addEdge(TR::CFGEdge::createEdge(newBlock, loop->getEntryBlock(), trMemory()));
TR::CFGEdge::createEdge(newNode, loopNode, trMemory());
_cfg->removeEdge(edgeToRemove);
parent->removeEdge(predBlock, loopNode->getStructure());
predNode = newNode;
predBlock = newBlockStr;
pBlock = newBlock;
}
TR::Block *spillBlock = _spillNode->getStructure()->asRegion()->getEntryBlock();
// 1- Change the bound node in the loop-test.
// N gets replaced by N-(ku-1) or N-(ku+1) (increasing or decreasing loops)
// If the bound is a constant - replace the constant in-place.
// Else save the new bound in a temporary outside the loop.
//
TR::Node *originalLimitNode = branch->getSecondChild();
TR::Node *newLimitNode = NULL;
int32_t adjustment = getLoopStride() * (1+_unrollCount) +
(isIncreasingLoop() ? -1 : 1);
bool const_overflow = false;
bool is64BitComparison = TR::DataType::getSize(getTestChildType()) == 8 ? true : false;
// check for overflow if upper bound is constant
if (originalLimitNode->getOpCode().isLoadConst() &&
getTestIsUnsigned() )
{
// Address compare generated by loop strider does not have constant node,
// thus should not fall into this category
TR_ASSERT(!originalLimitNode->getType().isAddress(), "Counted loop with a constant address limit node is unexpected, test node is %p", getTestNode());
// TODO: don't unroll such loops
if(getTestChildType().isInt32())
{
unsigned utemp = originalLimitNode->getUnsignedInt() - adjustment;
const_overflow = (isIncreasingLoop() && originalLimitNode->getUnsignedInt() < utemp) ||
(!isIncreasingLoop() && originalLimitNode->getUnsignedInt() > utemp);
}
else if(getTestChildType().isInt64())
{
uint64_t utemp = originalLimitNode->getUnsignedLongInt() - adjustment;
const_overflow = (isIncreasingLoop() && originalLimitNode->getUnsignedLongInt() < utemp) ||
(!isIncreasingLoop() && originalLimitNode->getUnsignedLongInt() > utemp);
}
}
//TR_ASSERT(!const_overflow, "Unroll count is bigger than upper bound\n");
if (originalLimitNode->getOpCode().isLoadConst() && !const_overflow)
{
// Address compare generated by loop strider does not have constant node,
// thus should not fall into this category
TR_ASSERT(!originalLimitNode->getType().isAddress(), "Counted loop with a constant address limit node is unexpected, test node is %p", getTestNode());
newLimitNode = TR::Node::create(branch, getConstOpCode(getTestChildType()));
if (getTestChildType().isInt32())
newLimitNode->setInt(originalLimitNode->getInt() - adjustment);
else
newLimitNode->setLongInt(originalLimitNode->getLongInt() - adjustment);
branch->setAndIncChild(1, newLimitNode);
}
else
{
// Hoist computation outside loop, with a test for overflow
//
TR::TreeTop *storeToTempTT;
TR::Node *storeToTemp;
TR::Node *originalLimitClone = originalLimitNode->duplicateTree();
TR::Node *tempValue = NULL;
TR::SymbolReference *tempSym;
if (getIndexType().isAddress())
{
tempSym = comp()->getSymRefTab()->createTemporary(comp()->getMethodSymbol(), TR::Address, true);
tempSym->getSymbol()->castToInternalPointerAutoSymbol()->setPinningArrayPointer
(_piv->getSymRef()->getSymbol()->castToInternalPointerAutoSymbol()->getPinningArrayPointer());
}
else
tempSym = comp()->getSymRefTab()->createTemporary(comp()->getMethodSymbol(), getTestChildType().getDataType());
TR::Node *constNode = TR::Node::create(branch, getConstOpCode(getTestChildType()), 0);
TR::ILOpCodes storeOpCode;
// if (getTestIsUnsigned())
// {
// if (getTestChildType().isInt32())
// constNode->setInt(adjustment);
// else
// constNode->setLongInt(adjustment);
// TR::ILOpCodes addOpCode = getTestChildType().isInt64() ? TR::lsub : TR::isub;
// tempValue = TR::Node::create(addOpCode, 2,originalLimitClone, constNode);
// storeOpCode = getTestChildType().isInt64() ? TR::lstore : TR::istore;
// }
// else
// {
if (!is64BitComparison)
constNode->setInt(-adjustment);
else
constNode->setLongInt(-adjustment);
TR::ILOpCodes addOpCode = getIndexType().isAddress() ?
(is64BitComparison ? TR::aladd : TR::aiadd) :
(is64BitComparison ? TR::ladd : TR::iadd) ;
tempValue = TR::Node::create(addOpCode, 2,originalLimitClone, constNode);
if (getIndexType().isAddress())
{
tempValue->setPinningArrayPointer
(_piv->getSymRef()->getSymbol()->castToInternalPointerAutoSymbol()->getPinningArrayPointer());
tempValue->setIsInternalPointer(true);
}
storeOpCode = getIndexType().isAddress() ?
TR::astore :
(is64BitComparison ? TR::lstore : TR::istore);
// }
storeToTemp = TR::Node::createWithSymRef(storeOpCode, 1, 1, tempValue, tempSym);
storeToTempTT = TR::TreeTop::create(comp(), storeToTemp);
newLimitNode = TR::Node::createLoad(branch, tempSym);
if (getIndexType().isAddress() || getTestChildType().isAddress())
{
TR_ASSERT(getIndexType().isAddress() && getTestChildType().isAddress(), "Test child type and IV type should both be address");
}
else if (newLimitNode->getType().isAggregate() && !getTestChildType().isAggregate())
{
TR::ILOpCodes o2xOp = TR::ILOpCode::getProperConversion(newLimitNode->getDataType(), getTestChildType().getDataType(), true);
TR_ASSERT(o2xOp != TR::BadILOp,"could not find conv op for %s -> %s conversion\n",TR::DataType::getName(newLimitNode->getDataType()),TR::DataType::getName(getTestChildType().getDataType()));
newLimitNode = TR::Node::create(o2xOp, 1, newLimitNode);
}
branch->setAndIncChild(1, newLimitNode);
TR::TreeTop *lastTree = pBlock->getLastRealTreeTop();
if (lastTree->getNode()->getOpCode().isBranch())
{
// Splice the block into two, putting the goto in the next block
TR_ASSERT(lastTree->getNode()->getOpCodeValue() == TR::Goto, "expecting canon loops");
TR::Block *newBlock = TR::Block::createEmptyBlock(lastTree->getNode(), comp(), pBlock->getFrequency(), pBlock);
lastTree->getPrevTreeTop()->join(lastTree->getNextTreeTop());
newBlock->append(lastTree);
newBlock->getExit()->join(pBlock->getNextBlock()->getEntry());
pBlock->getExit()->join(newBlock->getEntry());
_cfg->addNode(newBlock);
TR_BlockStructure *newBlockStructure = new (_cfg->structureRegion()) TR_BlockStructure(comp(), newBlock->getNumber(), newBlock);
TR_StructureSubGraphNode *newSubNode = new (_cfg->structureRegion()) TR_StructureSubGraphNode(newBlockStructure);
parent->addSubNode(newSubNode);
TR::CFGEdge *edgeToRemove = pBlock->getSuccessors().front();
_cfg->addEdge(TR::CFGEdge::createEdge(pBlock, newBlock, trMemory()));
TR::CFGEdge::createEdge(predNode, newSubNode, trMemory());
_cfg->addEdge(TR::CFGEdge::createEdge(newBlock, loop->getEntryBlock(), trMemory()));
TR::CFGEdge::createEdge(newSubNode, loopNode, trMemory());
_cfg->removeEdge(edgeToRemove);
parent->removeEdge(predBlock, loopNode->getStructure());
}
// create the n, n - 3 test (overflow test)
TR::ILOpCodes opCode;
if (getIndexType().isAddress())
{
opCode = isIncreasingLoop() ? TR::ifacmplt : TR::ifacmpgt;
}
else
{
if (getTestIsUnsigned())
{
if (getTestChildType().isInt32())
opCode = isIncreasingLoop() ? TR::ifiucmplt : TR::ifiucmpgt;
else
opCode = isIncreasingLoop() ? TR::iflucmplt : TR::iflucmpgt;
}
else
{
if (getTestChildType().isInt32())
opCode = isIncreasingLoop() ? TR::ificmplt : TR::ificmpgt;
else
opCode = isIncreasingLoop() ? TR::iflcmplt : TR::iflcmpgt;
}
}
TR::Node *c2 = tempValue;
pBlock->append(storeToTempTT);
pBlock->append(TR::TreeTop::create(comp(), TR::Node::createif(opCode,
originalLimitClone, c2,
spillBlock->getEntry())));
_overflowTestBlock = pBlock;
_cfg->addEdge(TR::CFGEdge::createEdge(pBlock, spillBlock, trMemory()));
TR::CFGEdge::createEdge(predNode, _spillNode, trMemory());
}
originalLimitNode->recursivelyDecReferenceCount();
if (trace())
{
comp()->dumpMethodTrees("\nbefore adding the loopiter test");
getDebug()->print(comp()->getOutFile(), _rootStructure, 6);
}
// add the minimum loop iteration test after the overflow test
//
if (1) /// moveEntryNode
{
TR::ILOpCodes opCode = _branchToExit ?
branch->getOpCodeValue() : /* use same polarity */
branch->getOpCode().getOpCodeForReverseBranch();
TR::TreeTop *lastTree = pBlock->getLastRealTreeTop();
TR::Node *firstChild = TR::Node::createLoad(branch, _piv->getSymRef());
if (getIndexType().isAddress() || getTestChildType().isAddress())
{
TR_ASSERT(getIndexType().isAddress() && getTestChildType().isAddress(), "Test child type and IV type should both be address");
}
else if (firstChild->getType().isAggregate() && !getTestChildType().isAggregate())
{
TR::ILOpCodes o2xOp = TR::ILOpCode::getProperConversion(firstChild->getDataType(), getTestChildType().getDataType(), true);
TR_ASSERT(o2xOp != TR::BadILOp,"could not find conv op for %s -> %s conversion\n",TR::DataType::getName(firstChild->getDataType()),TR::DataType::getName(getTestChildType().getDataType()));
firstChild = TR::Node::create(o2xOp, 1, firstChild);
}
else if (getIndexType().isInt16())
{
if (getTestChildType().isInt64())
firstChild = TR::Node::create(TR::s2l, 1, firstChild);
else if (getTestChildType().isInt32())
firstChild = TR::Node::create(TR::s2i, 1, firstChild);
}
else if (getIndexType().isInt8())
{
if (getTestChildType().isInt64())
firstChild = TR::Node::create(TR::b2l, 1, firstChild);
else if (getTestChildType().isInt32())
firstChild = TR::Node::create(TR::b2i, 1, firstChild);
else if (getTestChildType().isInt16())
firstChild = TR::Node::create(TR::b2s, 1, firstChild);
}
else if (getIndexType().isInt32() && getTestChildType().isInt64())
{
firstChild = TR::Node::create(TR::i2l, 1, firstChild);
}
else if (getIndexType().isInt64() && getTestChildType().isInt32())
{
firstChild = TR::Node::create(TR::l2i, 1, firstChild);
}
TR::Node *dupNewLimit = newLimitNode->duplicateTree();
if (loop->getPrimaryInductionVariable() &&
loop->getPrimaryInductionVariable()->usesUnchangedValueInLoopTest())
{
//getLoopStride is +/- depending on the direction of the loop
//
int32_t incrVal = getLoopStride();
// always use add for addresses, so the stride needs to be negated
// because we're using sub below
//
bool isAddress = getIndexType().isAddress();
if (isAddress)
incrVal = -incrVal;
TR::ILOpCodes subOp;
TR::Node *constNode = NULL;
if (is64BitComparison)
{
subOp = isAddress ? TR::aladd : TR::lsub;
constNode = TR::Node::lconst(newLimitNode, (int64_t) incrVal);
}
else
{
subOp = isAddress ? TR::aiadd : TR::isub;
constNode = TR::Node::iconst(newLimitNode, incrVal);
}
dupNewLimit = TR::Node::create(subOp, 2, dupNewLimit, constNode);
}
TR::TreeTop *iterGuard =
TR::TreeTop::create(comp(),
TR::Node::createif(opCode, firstChild, dupNewLimit, spillBlock->getEntry()));
if (lastTree->getNode()->getOpCodeValue() != TR::Goto)
{
// append an if block to the loop invariant block
//
TR::Block *newBlock = TR::Block::createEmptyBlock(lastTree->getNode(), comp(), pBlock->getFrequency(), pBlock);
newBlock->append(iterGuard);
TR::Block *nextBlock = pBlock->getNextBlock();
newBlock->getExit()->join(nextBlock->getEntry());
pBlock->getExit()->join(newBlock->getEntry());
_cfg->addNode(newBlock);
TR_BlockStructure *newBlockStructure = new (_cfg->structureRegion()) TR_BlockStructure(comp(), newBlock->getNumber(), newBlock);
TR_StructureSubGraphNode *newSubNode = new (_cfg->structureRegion()) TR_StructureSubGraphNode(newBlockStructure);
parent->addSubNode(newSubNode);
TR::CFGEdge *edgeToRemove = NULL;
for (auto edge = pBlock->getSuccessors().begin(); edge != pBlock->getSuccessors().end(); ++edge)
{
if ((*edge)->getTo()->getNumber() != spillBlock->getNumber())
{
edgeToRemove = *edge;
break;
}
}
_cfg->addEdge(TR::CFGEdge::createEdge(pBlock, newBlock, trMemory()));
TR::CFGEdge::createEdge(predNode, newSubNode, trMemory());
_cfg->addEdge(TR::CFGEdge::createEdge(newBlock, spillBlock, trMemory()));
TR::CFGEdge::createEdge(newSubNode, _spillNode, trMemory());
_cfg->addEdge(TR::CFGEdge::createEdge(newBlock, nextBlock, trMemory()));
TR::CFGEdge::createEdge(newSubNode, parent->findSubNodeInRegion(nextBlock->getNumber()), trMemory());
_cfg->removeEdge(edgeToRemove);
parent->removeEdge(predBlock, parent->findSubNodeInRegion(nextBlock->getNumber())->getStructure());
_loopIterTestBlock = newBlock;
}
else
{
// loop invariant block ends with a goto
// create a new block - move the goto in the new block and add append an if to the loop inv block
//
TR::Block *newBlock = pBlock->split(lastTree, _cfg);
pBlock->append(iterGuard);
TR_BlockStructure *newBlockStructure = new (_cfg->structureRegion()) TR_BlockStructure(comp(), newBlock->getNumber(), newBlock);
TR_StructureSubGraphNode *newSubNode = new (_cfg->structureRegion()) TR_StructureSubGraphNode(newBlockStructure);
parent->addSubNode(newSubNode);
_cfg->addEdge(TR::CFGEdge::createEdge(pBlock, spillBlock, trMemory()));
TR::CFGEdge::createEdge(predNode, _spillNode, trMemory());
// TR::Block::split does not know how to fix the structure edges, so do that ourselves
TR::CFGEdge::createEdge(predNode, newSubNode, trMemory());
TR::CFGEdge::createEdge(newSubNode, loopNode, trMemory());
parent->removeEdge(predBlock, loop);
_loopIterTestBlock = pBlock;
}
if (trace())
{
comp()->dumpMethodTrees("\nafter adding loopiter test");
getDebug()->print(comp()->getOutFile(), _rootStructure, 6);
}
}
}
// if an internalpointer is going to be created, ensure it
// does not exceed the limits
bool TR_LoopUnroller::isInternalPointerLimitExceeded()
{
return _spillLoopRequired && isCountedLoop() && getIndexType().isAddress() &&
comp()->getSymRefTab()->getNumInternalPointers() >= comp()->maxInternalPointers();
}
void TR_LoopUnroller::modifyOriginalLoop(TR_RegionStructure *loop, TR_StructureSubGraphNode *branchNode)
{
int32_t origExitNum = 0;
if (1)
{
ListIterator<TR::CFGEdge> it(&loop->getExitEdges());
for (TR::CFGEdge *edge = it.getFirst(); edge; edge = it.getNext())
{
if (edge->getFrom()->asStructureSubGraphNode() == branchNode)
{
origExitNum = edge->getTo()->getNumber();
break;
}
}
}
if (!isCountedLoop())
{
TR_ASSERT(_unrollKind != CompleteUnroll, "Non induction loops cannot be unrolled completely");
TR_ASSERT(_spillLoopRequired == false, "Non induction loops must be unrolled without a spill loop");
}
TR::CFGEdge *edge;
//Redirect all the local predecessors of the entry to the 'firstEntryNode'
for (auto edge = loop->getEntry()->getPredecessors().begin(); edge != loop->getEntry()->getPredecessors().end();)
{
TR::CFGEdge* current = *(edge++);
if (!loop->isExitEdge(current))
{
TR_StructureSubGraphNode *predNode = toStructureSubGraphNode(current->getFrom());
if (predNode->getNumber() < _numNodes)
{
if (shouldConnectToNextIteration(predNode, loop))
{
addEdgeAndFixEverything(loop, current, predNode, _firstEntryNode, true, true, true, BackEdgeFromPrevGeneration);
loop->removeEdge(predNode->getStructure(), loop->getEntry()->getStructure());
}
else
{
if (trace())
traceMsg(comp(), "Redirecting cold edge from block_%d to unrolled loop header rather than going to the next iteration\n", predNode->getNumber());
addEdgeAndFixEverything(loop, current, predNode, loop->getEntry(), true, false, true, BackEdgeToEntry);
}
}
}
}
//Find the node corresponding to loop
TR_RegionStructure *parent = loop->getParent()->asRegion();
TR_RegionStructure::Cursor nodeIt(*parent);
TR_StructureSubGraphNode *loopNode = NULL;
for (TR_StructureSubGraphNode *node = nodeIt.getFirst(); node; node = nodeIt.getNext())
if (node->getStructure() == loop)
{
loopNode = node;
break;
}
TR_ASSERT(loopNode != NULL, "loopNode not found\n");
TR::Block *branchBlock = branchNode->getStructure()->asBlock()->getBlock();
TR::Node *branch = branchBlock->getLastRealTreeTop()->getNode();
// find the insertion point of the unrolled bodies
//
TR::TreeTop *oldLoopEntryTree = NULL; //loop->getEntryBlock()->getEntry();
if (_unrollKind == SPMDKernel)
{
if (_spillLoopRequired)
modifyBranchTree(loop, loopNode, branchNode);
}
else
if (isCountedLoop() && _unrollKind != CompleteUnroll) /*GGLU*/
{
//The branch condition is modified if there is going to be a spill loop.
if (_spillLoopRequired)
{
modifyBranchTree(loop, loopNode, branchNode);
}
// IVA does not create PIV for ifacmpne and ifacmpeq, thus loops with ifacmpne are not counted loop
// and they won't enter this if so there is no need to check for ifacmpne
TR_ASSERT(branch->getOpCodeValue() != TR::ifacmpeq && branch->getOpCodeValue() != TR::ifacmpne, "Counted loop with branch node %p of opcode %s is unexpected\n", branch, branch->getOpCode().getName());
//convert the != condition to a '<' or '>' condition.
if (branch->getOpCodeValue() == TR::ificmpne)
{
if (isIncreasingLoop())
TR::Node::recreate(branch, TR::ificmplt);
else
TR::Node::recreate(branch, TR::ificmpgt);
}
else if (branch->getOpCodeValue() == TR::iflcmpne)
{
if (isIncreasingLoop())
TR::Node::recreate(branch, TR::iflcmplt);
else
TR::Node::recreate(branch, TR::iflcmpgt);
}
}
else if (_unrollKind == CompleteUnroll) /*GGLU*/
{
//Complete Unroll. Remove the branch
//
TR::Block *destBlock = branch->getBranchDestination()->getNode()->getBlock();
TR_Structure *destStruct = destBlock->getStructureOf();
if (loop->contains(destStruct, loop->getParent()))
{
TR::Node *gotoNode = TR::Node::create(branch, TR::Goto);
TR::TreeTop *gotoTree = TR::TreeTop::create(comp(), gotoNode);
gotoNode->setBranchDestination(destBlock->getEntry());
gotoNode->setLocalIndex(CREATED_BY_GLU);
TR::TransformUtil::removeTree(comp(), branchBlock->getLastRealTreeTop());
branchBlock->append(gotoTree);
oldLoopEntryTree = branchBlock->getExit()->getNextTreeTop();
//Find exitNode X.
//
TR::CFGNode *exitNode = NULL;
for (auto edge = branchNode->getSuccessors().begin(); (edge != branchNode->getSuccessors().end()) && exitNode == NULL; ++edge)
{
if (loop->isExitEdge(*edge))
exitNode = (*edge)->getTo();
}
//Remove B->X*
//
removeExternalEdge(loop, branchNode, exitNode->getNumber());
TR_StructureSubGraphNode *concreteExitNode =
findNodeInHierarchy(loop->getParent()->asRegion(), exitNode->getNumber());
TR::Block *blockX = getEntryBlockNode(concreteExitNode)
->getStructure()->asBlock()->getBlock();
_cfg->removeEdge(branchBlock, blockX);
}
else
{
// FIXME: this is wrong (unreachable because of hack in heuristic)
//
// remove B->X*, replace the branch with a goto to the first entry node
// create edges for B->F
//
TR_ASSERT(0, "should not reach here");
branchBlock->removeBranch(comp());
}
}
//FIXME: we can improve the following a bit
// if (isCountedLoop && !_completeUnroll && !_spillLoopRequired)
// {
// //Adjust the induction variable information to include the new information
// _indVar->setIncr(new (trHeapMemory()) TR::VPIntConst(_loopStride * (1 + _unrollCount)));
// }
// else