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IdiomTransformations.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 2000
*
* 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 https://www.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] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <map>
#include "codegen/CodeGenerator.hpp"
#include "env/FrontEnd.hpp"
#include "compile/Compilation.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "control/Options.hpp"
#include "control/Options_inlines.hpp"
#include "env/CompilerEnv.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/AutomaticSymbol.hpp"
#include "il/Block.hpp"
#include "il/DataTypes.hpp"
#include "il/ILOpCodes.hpp"
#include "il/ILOps.hpp"
#include "il/ILProps.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/Symbol.hpp"
#include "il/SymbolReference.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Assert.hpp"
#include "infra/BitVector.hpp"
#include "infra/Cfg.hpp"
#include "infra/List.hpp"
#include "optimizer/IdiomRecognition.hpp"
#include "optimizer/IdiomRecognitionUtils.hpp"
#include "optimizer/Optimization_inlines.hpp"
#include "optimizer/Optimizer.hpp"
#include "optimizer/Structure.hpp"
#include "optimizer/UseDefInfo.hpp"
#include "ras/Debug.hpp"
#define OPT_DETAILS "O^O NEWLOOPREDUCER: "
#define DISPTRACE(OBJ) ((OBJ)->trace())
#define VERBOSE(OBJ) ((OBJ)->showMesssagesStdout())
#define PNEW new (PERSISTENT_NEW)
/** \brief
* Determines whether we should avoid transforming loops in java/lang/String due to functional issues when String
* compression is enabled.
*
* \param comp
* The compilation object.
*
* \return
* <c>true</c> if the transformation should be avoided, <c>false</c> otherwise.
*/
static bool avoidTransformingStringLoops(TR::Compilation* comp)
{
static bool cacheInitialized = false;
static bool cacheValue = false;
if (!cacheInitialized)
{
// TODO: This is a workaround for Java 829 functionality as we switched to using a byte[] backing array in String*.
// Remove this workaround once obsolete. Idiom recognition currently does not handle idioms involving char[] in a
// compressed string. String compression is technically a Java 9 feature, but for the sake of evaluating performance
// we need to be able to run our standard set of benchmarks, most of which do not work under Java 9 at the moment.
// This leaves us with the only option to run the respective benchmarks on Java 8 SR5, however in Java 8 SR5 the
// java/lang/String.value is of type char[] which will cause functional problems. To avoid these issues we will
// disable idiom recognition on Java 8 SR5 if String compression is enabled.
TR_OpaqueClassBlock* stringClass = comp->cg()->fej9()->getSystemClassFromClassName("java/lang/String", strlen("java/lang/String"), true);
if (stringClass != NULL)
{
// Only initialize the cache after we are certain java/lang/String has been resolved
cacheInitialized = true;
if (comp->cg()->fej9()->getInstanceFieldOffset(stringClass, "value", "[C") != ~0)
{
cacheValue = IS_STRING_COMPRESSION_ENABLED_VM(static_cast<TR_J9VMBase*>(comp->fe())->getJ9JITConfig()->javaVM);
}
}
}
return cacheValue;
}
//*****************************************************************************************
// It partially peels the loop body to align the top of the region
//*****************************************************************************************
bool
ChangeAlignmentOfRegion(TR_CISCTransformer *trans)
{
const bool disptrace = DISPTRACE(trans);
TR_CISCGraph *P = trans->getP();
TR_CISCGraph *T = trans->getT();
TR_CISCNode *pTop = P->getEntryNode()->getSucc(0);
TR_CISCNode *t;
TR_CISCNode *beforeLoop = NULL;
bool changed = false;
TR::Compilation * comp = trans->comp();
// Find actual pTop. Skip an optional node if there is no corresponding target node.
while (trans->getP2TRep(pTop) == NULL)
{
if (!pTop->isOptionalNode()) return changed;
pTop = pTop->getSucc(0);
}
// Try to find pTop in the predecessors of the loop body
for (t = T->getEntryNode(); t->isOutsideOfLoop();)
{
if (trans->analyzeT2P(t, pTop) & _T2P_MatchMask)
{
TR_CISCNode *chk;
for (chk = t->getSucc(0); chk->isOutsideOfLoop(); chk=chk->getSucc(0))
{
if (!chk->isNegligible() && trans->analyzeT2P(chk) == _T2P_NULL) break; // t is still invalid.
}
if (!chk->isOutsideOfLoop())
{
if (disptrace) traceMsg(comp, "ChangeAlignmentOfRegion : (t:%d p:%d) no need to change alignment\n",t->getID(),pTop->getID());
return changed; // Find pTop! Already aligned correctly
}
}
if (t->getNumSuccs() < 1)
{
if (disptrace) traceMsg(comp,"ChangeAlignmentOfRegion : #succs of tID:%d is 0\n", t->getID());
return changed; // cannot find either a loop body or pTop in the fallthrough path
}
beforeLoop = t;
switch(t->getOpcode())
{
case TR::lookup:
case TR::table:
int i;
for (i = t->getNumSuccs(); --i >= 0; )
{
TR_CISCNode *next_t = t->getSucc(i);
if (next_t->getOpcode() == TR::Case &&
next_t->getSucc(0) != T->getExitNode())
{
t = next_t->getSucc(0);
goto exit_switch;
}
}
// fall through
default:
t = t->getSucc(0);
break;
}
exit_switch:;
}
TR_ASSERT(beforeLoop, "error");
if (t->getOpcode() != TR::BBStart) return changed; // already aligned by this transformation before
t = t->getSucc(0); // Skip BBStart
int condT2P = trans->analyzeT2P(t, pTop);
if (condT2P & _T2P_MatchMask) return changed; // no need to change alignment
if (disptrace) traceMsg(comp,"ChangeAlignmentOfRegion : tTop %d, pTop %d\n",t->getID(),pTop->getID());
TR_CISCNodeRegion r(T->getNumNodes(), trans->trMemory()->heapMemoryRegion());
TR_CISCNode *firstNode = t;
TR_CISCNode *lastNode = NULL;
// Find the target node corresponding to pTop
int branchCount = 0;
for (;;)
{
if (condT2P != _T2P_NULL || !t->isNegligible()) lastNode = t;
t = t->getSucc(0);
if (t->getOpcode() == TR::BBEnd || t->getOpcode() == TR_exitnode || t == firstNode) return changed; // current limitation. peeling can be performed within the first BB of the body
if (t->getIlOpCode().isBranch())
if (++branchCount >= 2) return changed; // allow a single branch
condT2P = trans->analyzeT2P(t, pTop);
if (condT2P & _T2P_MatchMask)
break; // the target node corresponding to pTop is found
}
if (!lastNode) return changed; // the last node of the peeling region
TR_CISCNode *foundNode = lastNode->getSucc(0);
// Find the last non-negligible node
if (lastNode->isNegligible())
{
TR_CISCNode *lastNonNegligble = NULL;
for (t = firstNode; ;t = t->getSucc(0))
{
if (!t->isNegligible()) lastNonNegligble = t;
if (t == lastNode) break;
}
if (!lastNonNegligble) return changed;
lastNode = lastNonNegligble;
}
// Add nodes from firstNode to lastNode into the region r
if (disptrace) traceMsg(comp, "ChangeAlignmentOfRegion : foundNode %d, lastNode %d\n",foundNode->getID(),lastNode->getID());
if (branchCount > 0 &&
!lastNode->getIlOpCode().isBranch())
{
if (disptrace) traceMsg(comp, "Fail: there is a branch in the region. lastNode must be a branch node.\n");
return changed;
}
for (t = firstNode; ;t = t->getSucc(0))
{
r.append(t);
if (t == lastNode) break;
}
// analyze that all parents of every node in the region r are included in the region r.
ListIterator<TR_CISCNode> ri(&r);
for (t = ri.getFirst(); t; t = ri.getNext()) // each node in the region r
{
if (t->getOpcode() == TR::aload || t->getOpcode() == TR::iload)
{
bool noDefInR = true;
ListIterator<TR_CISCNode> chain(t->getChains());
TR_CISCNode *def;
for (def = chain.getFirst(); def; def = chain.getNext())
{
if (r.isIncluded(def))
{
noDefInR = false;
break;
}
}
if (noDefInR) continue; // If there is no def in r, it ignores this load node.
}
ListIterator<TR_CISCNode> pi(t->getParents());
TR_CISCNode *pn;
for (pn = pi.getFirst(); pn; pn = pi.getNext()) // each parent of t
{
if (!r.isIncluded(pn))
{
if (disptrace) traceMsg(comp,"ChangeAlignmentOfRegion : There is a parent(%d) of %d in the outside of the region\n", pn->getID(), t->getID());
return changed; // fail
}
}
}
/////////////////////////////
// From here, success path //
/////////////////////////////
T->duplicateListsDuplicator();
changed = true;
TR_CISCNode *from = r.getListHead()->getData();
TR_CISCNode *to = r.getListTail()->getData();
if (disptrace)
{
traceMsg(comp,"ChangeAlignmentOfRegion: Succ[0] of %d will be changed from %d to %d.\n",
beforeLoop->getID(),
beforeLoop->getSucc(0)->getID(),
foundNode->getID());
traceMsg(comp,"\tNodes from %d to %d will be added to BeforeInsertionList.\n",
from->getID(),to->getID());
}
TR_ASSERT(r.getListTail()->getData()->getIlOpCode().isTreeTop(), "error");
beforeLoop->replaceSucc(0, foundNode); // replace the loop entry with foundNode
TR_NodeDuplicator duplicator(comp);
for (t = ri.getFirst(); t; t = ri.getNext())
{
if (t->getIlOpCode().isTreeTop())
{
TR::Node *rep = t->getHeadOfTrNodeInfo()->_node;
if (disptrace)
{
traceMsg(comp,"add TR::Node 0x%p (tid:%d) to BeforeInsertionList.\n", rep, t->getID());
}
rep = duplicator.duplicateTree(rep);
if (t->getIlOpCode().isIf())
{
if (t->getOpcode() != rep->getOpCodeValue())
{
TR::TreeTop *ret;
for (ret = t->getHeadOfTreeTop()->getNextTreeTop();
ret->getNode()->getOpCodeValue() != TR::BBStart;
ret = ret->getNextTreeTop());
TR::Node::recreate(rep, (TR::ILOpCodes)t->getOpcode());
rep->setBranchDestination(ret);
}
}
trans->getBeforeInsertionList()->append(rep);
}
}
// Move the region ("from" - "to") to the last
trans->moveCISCNodes(from, to, NULL);
if (disptrace && changed)
{
traceMsg(comp,"After ChangeAlignmentOfRegion\n");
T->dump(comp->getOutFile(), comp);
}
return changed;
}
//*****************************************************************************************
// Analyze whether we can move the node n to immediately before the nodes in tgt.
// Both the node n and a node in tgt must be included in the list l.
// If the analysis fails, it will return NULL.
// Otherwise, it will return the target node, which must be included in the list tgt.
//*****************************************************************************************
TR_CISCNode *
analyzeMoveNodeForward(TR_CISCTransformer *trans, List<TR_CISCNode> *l, TR_CISCNode *n, List<TR_CISCNode> *tgt)
{
const bool disptrace = DISPTRACE(trans);
ListIterator<TR_CISCNode> ti(l);
TR_CISCNode *t;
TR_CISCNode *ret = NULL;
TR::Compilation * comp = trans->comp();
for (t = ti.getFirst(); t; t = ti.getNext())
{
if (t == n) break;
}
TR_ASSERT(t != NULL, "cannot find the node n in the list l!");
t = ti.getNext();
TR_ASSERT(t != NULL, "cannot find any node in tgt in the list l!");
if (tgt->find(t)) return NULL; // already moved
bool go = false;
if (n->isStoreDirect())
{
go = true;
}
else if (n->getNumChildren() == 2)
{
if (n->getIlOpCode().isAdd() ||
n->getIlOpCode().isSub() ||
n->getIlOpCode().isMul() ||
n->getIlOpCode().isLeftShift() ||
n->getIlOpCode().isRightShift() ||
n->getIlOpCode().isShiftLogical() ||
n->getIlOpCode().isAnd() ||
n->getIlOpCode().isOr() ||
n->getIlOpCode().isXor()) // Safe expressions
{
go = true;
if (n->getChild(0)->getOpcode() == TR_variable ||
n->getChild(1)->getOpcode() == TR_variable)
go = false; // not implemented yet.
}
}
else if (n->getNumChildren() == 1)
{
if (n->getIlOpCode().isConversion() ||
n->getIlOpCode().isNeg()) // Safe expressions
{
go = true;
if (n->getChild(0)->getOpcode() == TR_variable)
go = false; // not implemented yet.
}
}
else
{
if (n->getIlOpCode().isLoadConst())
{
go = true;
}
}
if (go)
{
List<TR_CISCNode> *chains = n->getChains();
List<TR_CISCNode> *parents = n->getParents();
TR_CISCNode *specialCareIf = trans->getP()->getSpecialCareNode(0);
bool generateCompensation0 = false;
while(true)
{
if (chains->find(t)) break; // it cannot be moved beyond its use/def.
if (parents->find(t)) break; // it cannot be moved beyond its parent.
if (t->getOpcode() == TR::BBStart)
{
TR::Block *block = t->getHeadOfTrNode()->getBlock();
if (block->getPredecessors().size() > 1) return NULL; // It currently analyzes within this BB.
}
if (t->getNumSuccs() >= 2 && specialCareIf)
{
bool fail = true;
TR_CISCNode *p = trans->getT2Phead(t);
if (p &&
p == specialCareIf &&
t->getSucc(1) == trans->getT()->getExitNode())
{
// add compensation code into AfterInsertionIdiomList and go ahead
TR::Node *trNode = n->getHeadOfTrNode();
if (trNode->getOpCode().isTreeTop())
{
if (trNode->getOpCode().isStoreDirect())
{
if (!generateCompensation0)
{
trans->getT()->duplicateListsDuplicator();
if (disptrace) traceMsg(comp,"analyzeMoveNodeForward: append the tree of 0x%p into AfterInsertionIdiomList\n", trNode);
trans->getAfterInsertionIdiomList(0)->append(trNode->duplicateTree());
}
fail = false;
generateCompensation0 = true;
}
// else, fail to move
}
else
{
fail = false;
}
}
if (fail) break; // It currently analyzes within this BB.
}
t = ti.getNext();
if (t == NULL) break; // cannot find any node in tgt in the list l.
ret = t;
if (tgt->find(t)) break; // find goal!
}
}
return ret;
}
//*****************************************************************************************
// It tries to reorder target nodes to match idiom nodes within each BB.
//*****************************************************************************************
bool
reorderTargetNodesInBB(TR_CISCTransformer *trans)
{
TR_CISCGraph *P = trans->getP();
TR_CISCGraph *T = trans->getT();
List<TR_CISCNode> *T2P = trans->getT2P(), *P2T = trans->getP2T(), *l;
TR_CISCNode *t, *p;
bool changed = false;
const bool disptrace = DISPTRACE(trans);
TR::Compilation * comp = trans->comp();
static int enable = -1;
if (enable < 0)
{
char *p = feGetEnv("DISABLE_REORDER");
enable = p ? 0 : 1;
}
if (!enable) return false;
TR_BitVector visited(T->getNumNodes(), comp->trMemory());
while(true)
{
ListIterator<TR_CISCNode> ti(T->getNodes());
int currentPID = 0x10000;
bool anyChanged = false;
for (t = ti.getFirst(); t; t = ti.getNext())
{
int tID = t->getID();
if (visited.isSet(tID)) continue;
visited.set(tID);
l = T2P + tID;
if (l->isEmpty()) // There is no idiom nodes corresponding to the node t
{
if (t->isNegligible())
{
continue; // skip the node t
}
else
{
break; // finish this analysis
}
}
int maxPid = -1;
ListIterator<TR_CISCNode> pi(l);
for (p = pi.getFirst(); p; p = pi.getNext())
{
if (p->getID() > maxPid) maxPid = p->getID();
}
if (maxPid >= 0)
{
if (maxPid <= currentPID)
{
currentPID = maxPid; // no problem
}
else
{
if (t->isOutsideOfLoop()) break; // reordering is currently supported only inside of the loop
// Try moving the node t forward
List<TR_CISCNode> *nextPlist = P2T+maxPid+1;
if (disptrace)
{
ListIterator<TR_CISCNode> nextTi(nextPlist);
TR_CISCNode *nextT;
traceMsg(comp,"reorderTargetNodesInBB: Try moving the tgt node %d forward until",tID);
for (nextT = nextTi.getFirst(); nextT; nextT = nextTi.getNext())
{
traceMsg(comp," %p(%d)",nextT,nextT->getID());
}
traceMsg(comp,"\n");
}
// Analyze whether we can move the node t to immediately before the nodes in nextPlist
List<TR_CISCNode> *dagList = T->getDagId2Nodes()+t->getDagID();
TR_CISCNode *tgt = analyzeMoveNodeForward(trans, dagList, t, nextPlist);
if (tgt)
{
T->duplicateListsDuplicator();
// OK, we can move the node t!
if (disptrace) traceMsg(comp,"We can move the node %d to %p(%d)\n",tID,tgt,tgt->getID());
anyChanged = changed = true;
trans->moveCISCNodes(t, t, tgt, "reorderTargetNodesInBB");
break;
}
}
}
}
if (!anyChanged) break;
}
if (disptrace && changed)
{
traceMsg(comp,"After reorderTargetNodesInBB\n");
T->dump(comp->getOutFile(), comp);
}
return changed;
}
//*****************************************************************************************
// It replicates a store instruction outside of the loop.
// It is specialized to those idioms that include TR_booltable
// Input: SpecialCareNode(0) - the TR_booltable in the idiom
// ImportantNode(1) - ificmpge for exiting the loop (optional)
//*****************************************************************************************
bool
moveStoreOutOfLoopForward(TR_CISCTransformer *trans)
{
TR_CISCGraph *P = trans->getP();
List<TR_CISCNode> *P2T = trans->getP2T();
TR_CISCNode *ixload, *aload, *iload;
TR::Compilation *comp = trans->comp();
TR_CISCNode *boolTable = P->getSpecialCareNode(0); // Note: The opcode isn't always TR_booltable.
TR_CISCNode *p = boolTable->getChild(0); // just before TR_booltable, such as b2i
TR_BitVector findBV(P->getNumNodes(), trans->trMemory(), stackAlloc);
findBV.set(boolTable->getID());
TR_CISCNode *optionalCmp = P->getImportantNode(1); // ificmpge
if (optionalCmp && (optionalCmp->getOpcode() == TR::ificmpge || optionalCmp->getOpcode() == TR_ifcmpall))
findBV.set(optionalCmp->getID());
ListIterator<TR_CISCNode> ti(P2T + p->getID());
TR_CISCNode *t;
TR_CISCNode *storedVariable = NULL;
bool success0 = false;
TR_ScratchList<TR_CISCNode> targetList(comp->trMemory());
for (t = ti.getFirst(); t; t = ti.getNext()) // for each target node corresponding to p
{
// t is a target node corresponding to p (just before TR_booltable)
ListIterator<TR_CISCNode> tParentIter(t->getParents());
TR_CISCNode *tParent;
for (tParent = tParentIter.getFirst(); tParent; tParent = tParentIter.getNext())
{
// checking whether tParent is a store instruction
if (tParent->isStoreDirect() &&
!tParent->isNegligible())
{
// checking whether all variables of stores are same.
if (!storedVariable) storedVariable = tParent->getChild(1);
else if (storedVariable != tParent->getChild(1))
{
if (DISPTRACE(trans)) traceMsg(comp, "moveStoreOutOfLoopForward failed because all variables of stores are not same.\n");
success0 = false;
goto endSpecial0; // FAIL!
}
// checking whether tParent will reach either boolTable or optionalCmp
if (checkSuccsSet(trans, tParent, &findBV))
{
success0 = true; // success for this t
break;
}
else
{
if (DISPTRACE(trans)) traceMsg(comp, "moveStoreOutOfLoopForward failed because tParent will not reach either boolTable or optionalCmp.\n");
success0 = false;
goto endSpecial0; // FAIL!
}
}
}
if (tParent) targetList.add(tParent); // add a store instruction
}
endSpecial0:
if (targetList.isEmpty())
{
if (DISPTRACE(trans)) traceMsg(comp, "moveStoreOutOfLoopForward failed because targetList is empty.\n");
success0 = false;
}
// check if descendants of p include an array load
if (!getThreeNodesForArray(p, &ixload, &aload, &iload, true))
{
if (DISPTRACE(trans)) traceMsg(comp, "moveStoreOutOfLoopForward failed because decendents of pid:%d don't include an array load.\n", p->getID());
success0 = false;
}
if (success0)
{
ixload = trans->getP2TRep(ixload);
aload = trans->getP2TRep(aload);
iload = trans->getP2TRep(iload);
if (DISPTRACE(trans)) traceMsg(comp, "moveStoreOutOfLoopForward: Target nodes ixload=%d, aload=%d, iload=%d\n",
ixload ? ixload->getID() : -1, aload ? aload->getID() : -1, iload ? iload->getID() : -1);
trans->getT()->duplicateListsDuplicator();
if (ixload && aload && iload && (iload->isLoadVarDirect() || iload->getOpcode() == TR_variable))
{
TR::Node *store;
TR::Node *conv;
TR::Node *storeDup0;
TR::Node *storeDup1;
TR::Node *convDup;
TR::Node *ixloadNode = ixload->getHeadOfTrNodeInfo()->_node;
TR::Node *iloadNode = iload->getHeadOfTrNodeInfo()->_node; // index
TR::Node *iloadm1Node = createOP2(comp, TR::isub,
TR::Node::createLoad(iloadNode, iloadNode->getSymbolReference()),
TR::Node::create(iloadNode, TR::iconst, 0, 1));
// prepare base[index]
TR::Node *arrayLoad0 = createArrayLoad(comp, trans->isGenerateI2L(),
ixloadNode,
aload->getHeadOfTrNodeInfo()->_node,
iloadNode,
ixloadNode->getSize());
// prepare base[index-1] (it may not be used.)
TR::Node *arrayLoad1 = createArrayLoad(comp, trans->isGenerateI2L(),
ixloadNode,
aload->getHeadOfTrNodeInfo()->_node,
iloadm1Node,
ixloadNode->getSize());
ti.set(&targetList);
t = ti.getFirst();
store = t->getHeadOfTrNodeInfo()->_node;
conv = store->getChild(0);
if (conv->getOpCode().isConversion())
{
convDup = TR::Node::create(conv->getOpCodeValue(), 1, arrayLoad0);
storeDup0 = TR::Node::createStore(store->getSymbolReference(), convDup);
convDup = TR::Node::create(conv->getOpCodeValue(), 1, arrayLoad1);
storeDup1 = TR::Node::createStore(store->getSymbolReference(), convDup);
}
else
{
storeDup0 = TR::Node::createStore(store->getSymbolReference(), arrayLoad0);
storeDup1 = TR::Node::createStore(store->getSymbolReference(), arrayLoad1);
}
trans->getAfterInsertionIdiomList(0)->append(storeDup0); // base[index]
trans->getAfterInsertionIdiomList(1)->append(storeDup1); // base[index-1] (it may not be used.)
if (VERBOSE(trans)) printf("%s moveStoreOutOfLoopForward\n", trans->getT()->getTitle());
if (DISPTRACE(trans)) traceMsg(comp, "moveStoreOutOfLoopForward adds %d into compensation code [0] and [1]\n", t->getID());
for (; t; t = ti.getNext()) t->setIsNegligible(); // set negligible to all stores
}
else
success0 = false;
}
return success0;
}
//*****************************************************************************************
// It analyzes redundant IAND. It is specialized to MEMCPYxxx2Byte, such as MEMCPYChar2Byte.
// Input: SpecialCareNode(*) - a set of conversions, such as i2b
//*****************************************************************************************
bool
IANDSpecialNodeTransformer(TR_CISCTransformer *trans)
{
TR_CISCGraph *P = trans->getP();
List<TR_CISCNode> *P2T = trans->getP2T();
TR::Compilation *comp = trans->comp();
int idx;
bool ret = false;
for (idx = 0; idx < MAX_SPECIALCARE_NODES; idx++)
{
TR_CISCNode *p = P->getSpecialCareNode(idx);
if (!p) break;
ListIterator<TR_CISCNode> ti(P2T + p->getID());
TR_CISCNode *t;
for (t = ti.getFirst(); t; t = ti.getNext())
{
if (t->getOpcode() != TR::i2b) continue; // not implemented yet for other OPs
TR_CISCNode *ch = t->getChild(0);
if (ch->isNegligible()) continue;
// example: the following two IANDs are redundant.
// dst = (byte)(((ch & 0xFF00) >> 8) & 0xFF)
// ^^^^^^^^ ^^^^^^
switch(ch->getOpcode())
{
case TR::iand:
if (!ch->getParents()->isSingleton() ||
!testIConst(ch, 1, 0xFF)) return false; // child(1) is "iconst 0xff"
ch->setIsNegligible(); // this IAND can be negligible!
ret = true;
ch = ch->getChild(0);
if (ch->getOpcode() != TR::ishr && ch->getOpcode() != TR::iushr) break;
// fall through if TR::ishr
case TR::ishr:
case TR::iushr:
if (!testIConst(ch, 1, 0x8)) break; // child(1) is "iconst 0x8"
ch = ch->getChild(0);
if (ch->getOpcode() != TR::iand) break;
if (!ch->getParents()->isSingleton() ||
!testIConst(ch, 1, 0xFF00)) return false; // child(1) is "iconst 0xFF00"
ch->setIsNegligible(); // this SHR can be negligible!
ret = true;
break;
}
}
}
return ret;
}
//////////////////////////////////////////////////////////////////////////
// utility routines
static void
findIndexLoad(TR::Node *aiaddNode, TR::Node *&index1, TR::Node *&index2, TR::Node *&topLevelIndex)
{
// iloadi
// aiadd <-- aiaddNode
// aload
// isub
// imul
// iload <-- looking for the index
// iconst 4
// iconst -16
//
// -or-
// iloadi
// aiadd
// aload
// isub
// iload
// iconst
//
// -or-
// iloadi
// aiadd <-- aiaddNode
// aload
// isub
// imul
// iadd
// iload <-- looking for the index
// iload <-- looking for the index
// iconst 4
// iconst -16
//
// -or-
// iloadi
// aiadd
// aload
// isub
// iadd
// iload <-- looking for the index
// iload <-- looking for the index
// iconst
//
index1 = NULL;
index2 = NULL;
topLevelIndex = NULL;
TR::Node *addOrSubNode = aiaddNode->getSecondChild();
if (addOrSubNode->getOpCode().isAdd() || addOrSubNode->getOpCode().isSub())
{
TR::Node *grandChild = NULL;
if (addOrSubNode->getFirstChild()->getOpCode().isMul())
grandChild = addOrSubNode->getFirstChild()->getFirstChild();
else
grandChild = addOrSubNode->getFirstChild();
if (grandChild->getOpCodeValue() == TR::i2l)
grandChild = grandChild->getFirstChild();
topLevelIndex = grandChild;
if (grandChild->getOpCode().hasSymbolReference())
{
index1 = grandChild;
}
else if (grandChild->getOpCode().isAdd() || grandChild->getOpCode().isSub())
{
TR::Node *grandGrandChild1 = grandChild->getFirstChild();
TR::Node *grandGrandChild2 = grandChild->getSecondChild();
while(grandGrandChild1->getOpCode().isAdd() || grandGrandChild1->getOpCode().isSub())
{
grandGrandChild2 = grandGrandChild1->getSecondChild();
grandGrandChild1 = grandGrandChild1->getFirstChild();
}
if (grandGrandChild1->getOpCode().hasSymbolReference())
{
index1 = grandGrandChild1;
}
if (grandGrandChild2->getOpCode().hasSymbolReference())
{
index2 = grandGrandChild2;
}
}
}
}
// get the iv thats involved in the looptest
//
static bool
usedInLoopTest(TR::Compilation *comp, TR::Node *loopTestNode, TR::SymbolReference *srcSymRef)
{
TR::Node *ivNode = loopTestNode->getFirstChild();
if (ivNode->getOpCode().isAdd() || ivNode->getOpCode().isSub())
ivNode = ivNode->getFirstChild();
if (ivNode->getOpCode().hasSymbolReference())
{
if (ivNode->getSymbolReference()->getReferenceNumber() == srcSymRef->getReferenceNumber())
return true;
}
else dumpOptDetails(comp, "iv %p in the loop test %p has no symRef?\n", ivNode, loopTestNode);
return false;
}
static bool
indexContainsArray(TR::Compilation *comp, TR::Node *index, vcount_t visitCount)
{
if (index->getVisitCount() == visitCount)
return false;
index->setVisitCount(visitCount);
if (comp->trace(OMR::idiomRecognition))
traceMsg(comp, "analyzing node %p\n", index);
if (index->getOpCode().hasSymbolReference() &&
index->getSymbolReference()->getSymbol()->isArrayShadowSymbol())
{
if (comp->trace(OMR::idiomRecognition))
traceMsg(comp, "found array node %p\n", index);
return true;
}
for (int32_t i = 0; i < index->getNumChildren(); i++)
if (indexContainsArray(comp, index->getChild(i), visitCount))
return true;
return false;
}
static bool
indexContainsArrayAccess(TR::Compilation *comp, TR::Node *aXaddNode)
{
if (comp->trace(OMR::idiomRecognition))
traceMsg(comp, "axaddnode %p\n", aXaddNode);
TR::Node *loadNode1, *loadNode2, *topLevelIndex;
findIndexLoad(aXaddNode, loadNode1, loadNode2, topLevelIndex);
// topLevelIndex now contains the actual expression q in a[q]
// if q contains another array access, then we cannot reduce
// this loop into an arraycopy
// ie. a[b[i]] do not represent linear array accesses
//
if (comp->trace(OMR::idiomRecognition))
traceMsg(comp, "aXaddNode %p topLevelIndex %p\n", aXaddNode, topLevelIndex);
vcount_t visitCount = comp->incOrResetVisitCount();
if (topLevelIndex)
return indexContainsArray(comp, topLevelIndex, visitCount);
return false;
}
// isIndexVariableInList checks whether the induction (index) variable symbol(s)
// from the given 'node' subtree is found inside 'nodeList'.
//
// Returns true if
// 1. one induction variable symbol is found in the list.
// Returns false if
// 1. no induction variables are found.
// 2. two induction variables found in 'node' tree are both in the list.
// i.e. a[i+j]
// i++;
// j++;
// In this case, the access pattern of the array would skip every
// other element.
static bool
isIndexVariableInList(TR::Node *node, List<TR::Node> *nodeList)
{
TR::Symbol *indexSymbol1 = NULL, *indexSymbol2 = NULL;
TR::Node *loadNode1, *loadNode2, *topLevelIndex;
findIndexLoad(node->getOpCode().isAdd() ? node : node->getFirstChild(),
loadNode1, loadNode2, topLevelIndex);
if (loadNode1)
indexSymbol1 = loadNode1->getSymbolReference()->getSymbol();
if (loadNode2)
indexSymbol2 = loadNode2->getSymbolReference()->getSymbol();
bool foundSymbol1 = false, foundSymbol2 = false;
if (indexSymbol1 || indexSymbol2)
{
// Search the node list for the index symbol(s).
ListIterator<TR::Node> li(nodeList);
TR::Node *store;
for (store = li.getFirst(); store; store = li.getNext())
{
TR::Symbol *storeSymbol = store->getSymbolReference()->getSymbol();
if (indexSymbol1 == storeSymbol)
foundSymbol1 = true;
if (indexSymbol2 && indexSymbol2 == storeSymbol)
foundSymbol2 = true;
}
}
// Return true only if either one symbol is found, but not both.
return foundSymbol1 ^ foundSymbol2;
}
// for the memCmp transformer
//
static bool
indicesAndStoresAreConsistent(TR::Compilation *comp, TR::Node *lhsSrcNode, TR::Node *rhsSrcNode, TR_CISCNode *lhsNode, TR_CISCNode *rhsNode)
{
// lhs and rhs indicate the two arrays involved in the comparison test
//
//
TR_ScratchList<TR::Node> variableList(comp->trMemory());
if (lhsNode)
variableList.add(lhsNode->getHeadOfTrNode());
if (rhsNode && rhsNode != lhsNode)
variableList.add(rhsNode->getHeadOfTrNode());
return (isIndexVariableInList(lhsSrcNode, &variableList) &&
isIndexVariableInList(rhsSrcNode, &variableList));
}
static TR::Node* getArrayBase(TR::Node *node)
{
if (node->getOpCode().hasSymbolReference() &&
node->getSymbolReference()->getSymbol()->isArrayShadowSymbol())
{
node = node->getFirstChild();
if (node->getOpCode().isArrayRef()) node = node->getFirstChild();
if (node->getOpCode().isIndirect()) node = node->getFirstChild();
return node;
}
return NULL;
}
static bool
areArraysInvariant(TR::Compilation *comp, TR::Node *inputNode, TR::Node *outputNode, TR_CISCGraph *T)
{
if (T)
{
TR::Node *aNode = getArrayBase(inputNode);
TR::Node *bNode = getArrayBase(outputNode);
if (comp->trace(OMR::idiomRecognition))
traceMsg(comp, "aNode = %p bNode = %p\n", aNode, bNode);
if (aNode && aNode->getOpCode().isLoadDirect() &&
bNode && bNode->getOpCode().isLoadDirect())
{
TR_CISCNode *aCNode = T->getCISCNode(aNode);
TR_CISCNode *bCNode = T->getCISCNode(bNode);
if (comp->trace(OMR::idiomRecognition))
traceMsg(comp, "aC = %p %d bC = %p %d\n", aCNode, aCNode->getID(), bCNode, bCNode->getID());
if (aCNode && bCNode)
{
ListIterator<TR_CISCNode> aDefI(aCNode->getChains());
ListIterator<TR_CISCNode> bDefI(bCNode->getChains());
TR_CISCNode *ch;
for (ch = aDefI.getFirst(); ch; ch = aDefI.getNext())
{
if (ch->getDagID() == aCNode->getDagID())