-// $Id$
//***************************************************************************
// File:
// PhyRegAlloc.cpp
#include "llvm/CodeGen/RegisterAllocation.h"
#include "llvm/CodeGen/PhyRegAlloc.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrAnnot.h"
+#include "llvm/CodeGen/MachineCodeForBasicBlock.h"
#include "llvm/CodeGen/MachineCodeForMethod.h"
#include "llvm/Analysis/LiveVar/FunctionLiveVarInfo.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/BasicBlock.h"
#include "llvm/Function.h"
#include "llvm/Type.h"
+#include "llvm/iOther.h"
+#include "llvm/CodeGen/RegAllocCommon.h"
+#include "Support/CommandLine.h"
+#include "Support/STLExtras.h"
#include <iostream>
#include <math.h>
using std::cerr;
+using std::vector;
-
-// ***TODO: There are several places we add instructions. Validate the order
-// of adding these instructions.
-
-cl::Enum<RegAllocDebugLevel_t> DEBUG_RA("dregalloc", cl::NoFlags,
+RegAllocDebugLevel_t DEBUG_RA;
+static cl::Enum<RegAllocDebugLevel_t> DEBUG_RA_c(DEBUG_RA, "dregalloc",
+ cl::Hidden,
"enable register allocation debugging information",
clEnumValN(RA_DEBUG_None , "n", "disable debug output"),
clEnumValN(RA_DEBUG_Normal , "y", "enable debug output"),
TargetMachine &Target;
public:
inline RegisterAllocator(TargetMachine &T) : Target(T) {}
+
+ const char *getPassName() const { return "Register Allocation"; }
- bool runOnFunction(Function *F) {
+ bool runOnFunction(Function &F) {
if (DEBUG_RA)
- cerr << "\n******************** Function "<< F->getName()
- << " ********************\n";
+ cerr << "\n********* Function "<< F.getName() << " ***********\n";
- PhyRegAlloc PRA(F, Target, &getAnalysis<FunctionLiveVarInfo>(),
+ PhyRegAlloc PRA(&F, Target, &getAnalysis<FunctionLiveVarInfo>(),
&getAnalysis<LoopInfo>());
PRA.allocateRegisters();
// create each RegisterClass and put in RegClassList
//
- for(unsigned int rc=0; rc < NumOfRegClasses; rc++)
+ for (unsigned rc=0; rc < NumOfRegClasses; rc++)
RegClassList.push_back(new RegClass(F, MRI.getMachineRegClass(rc),
&ResColList));
}
// Destructor: Deletes register classes
//----------------------------------------------------------------------------
PhyRegAlloc::~PhyRegAlloc() {
- for( unsigned int rc=0; rc < NumOfRegClasses; rc++)
+ for ( unsigned rc=0; rc < NumOfRegClasses; rc++)
delete RegClassList[rc];
AddedInstrMap.clear();
if (HMI->first) {
LiveRange *L = HMI->second; // get the LiveRange
if (!L) {
- if( DEBUG_RA) {
+ if (DEBUG_RA) {
cerr << "\n*?!?Warning: Null liver range found for: "
<< RAV(HMI->first) << "\n";
}
}
// if the Value * is not null, and LR
// is not yet written to the IGNodeList
- if( !(L->getUserIGNode()) ) {
+ if (!(L->getUserIGNode()) ) {
RegClass *const RC = // RegClass of first value in the LR
RegClassList[ L->getRegClass()->getID() ];
}
// init RegClassList
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
+ for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)
RegClassList[rc]->createInterferenceGraph();
- if( DEBUG_RA)
+ if (DEBUG_RA)
cerr << "LRLists Created!\n";
}
// for each live var in live variable set
//
- for( ; LIt != LVSet->end(); ++LIt) {
+ for ( ; LIt != LVSet->end(); ++LIt) {
- if (DEBUG_RA > 1)
+ if (DEBUG_RA >= RA_DEBUG_Verbose)
cerr << "< Def=" << RAV(Def) << ", Lvar=" << RAV(*LIt) << "> ";
// get the live range corresponding to live var
// doesn't have a dominating def - see Assumptions above
//
if (LROfVar) {
- if(LROfDef == LROfVar) // do not set interf for same LR
+ if (LROfDef == LROfVar) // do not set interf for same LR
continue;
// if 2 reg classes are the same set interference
//
if (RCOfDef == LROfVar->getRegClass()) {
RCOfDef->setInterference( LROfDef, LROfVar);
- } else if (DEBUG_RA > 1) {
+ } else if (DEBUG_RA >= RA_DEBUG_Verbose) {
// we will not have LRs for values not explicitly allocated in the
// instruction stream (e.g., constants)
cerr << " warning: no live range for " << RAV(*LIt) << "\n";
void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst,
const ValueSet *LVSetAft) {
- if( DEBUG_RA)
+ if (DEBUG_RA)
cerr << "\n For call inst: " << *MInst;
ValueSet::const_iterator LIt = LVSetAft->begin();
// for each live var in live variable set after machine inst
//
- for( ; LIt != LVSetAft->end(); ++LIt) {
+ for ( ; LIt != LVSetAft->end(); ++LIt) {
// get the live range corresponding to live var
//
LiveRange *const LR = LRI.getLiveRangeForValue(*LIt );
- if( LR && DEBUG_RA) {
+ if (LR && DEBUG_RA) {
cerr << "\n\tLR Aft Call: ";
printSet(*LR);
}
// LR can be null if it is a const since a const
// doesn't have a dominating def - see Assumptions above
//
- if( LR ) {
+ if (LR ) {
LR->setCallInterference();
- if( DEBUG_RA) {
+ if (DEBUG_RA) {
cerr << "\n ++Added call interf for LR: " ;
printSet(*LR);
}
// of the call is live in this set - but it does not interfere with call
// (i.e., we can allocate a volatile register to the return value)
//
- if( const Value *RetVal = MRI.getCallInstRetVal( MInst )) {
+ CallArgsDescriptor* argDesc = CallArgsDescriptor::get(MInst);
+
+ if (const Value *RetVal = argDesc->getReturnValue()) {
LiveRange *RetValLR = LRI.getLiveRangeForValue( RetVal );
assert( RetValLR && "No LR for RetValue of call");
RetValLR->clearCallInterference();
// If the CALL is an indirect call, find the LR of the function pointer.
// That has a call interference because it conflicts with outgoing args.
- if( const Value *AddrVal = MRI.getCallInstIndirectAddrVal( MInst )) {
+ if (const Value *AddrVal = argDesc->getIndirectFuncPtr()) {
LiveRange *AddrValLR = LRI.getLiveRangeForValue( AddrVal );
assert( AddrValLR && "No LR for indirect addr val of call");
AddrValLR->setCallInterference();
void PhyRegAlloc::buildInterferenceGraphs()
{
- if(DEBUG_RA) cerr << "Creating interference graphs ...\n";
+ if (DEBUG_RA) cerr << "Creating interference graphs ...\n";
unsigned BBLoopDepthCost;
for (Function::const_iterator BBI = Meth->begin(), BBE = Meth->end();
// find the 10^(loop_depth) of this BB
//
- BBLoopDepthCost = (unsigned) pow(10.0, LoopDepthCalc->getLoopDepth(*BBI));
+ BBLoopDepthCost = (unsigned)pow(10.0, LoopDepthCalc->getLoopDepth(BBI));
// get the iterator for machine instructions
//
- const MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
+ const MachineCodeForBasicBlock& MIVec = MachineCodeForBasicBlock::get(BBI);
MachineCodeForBasicBlock::const_iterator MII = MIVec.begin();
// iterate over all the machine instructions in BB
//
- for( ; MII != MIVec.end(); ++MII) {
+ for ( ; MII != MIVec.end(); ++MII) {
const MachineInstr *MInst = *MII;
// get the LV set after the instruction
//
- const ValueSet &LVSetAI = LVI->getLiveVarSetAfterMInst(MInst, *BBI);
+ const ValueSet &LVSetAI = LVI->getLiveVarSetAfterMInst(MInst, BBI);
const bool isCallInst = TM.getInstrInfo().isCall(MInst->getOpCode());
- if( isCallInst ) {
+ if (isCallInst ) {
// set the isCallInterference flag of each live range wich extends
// accross this call instruction. This information is used by graph
// coloring algo to avoid allocating volatile colors to live ranges
// instr (currently, only calls have this).
//
unsigned NumOfImpRefs = MInst->getNumImplicitRefs();
- if( NumOfImpRefs > 0 ) {
- for(unsigned z=0; z < NumOfImpRefs; z++)
- if( MInst->implicitRefIsDefined(z) )
+ if ( NumOfImpRefs > 0 ) {
+ for (unsigned z=0; z < NumOfImpRefs; z++)
+ if (MInst->implicitRefIsDefined(z) )
addInterference( MInst->getImplicitRef(z), &LVSetAI, isCallInst );
}
//
addInterferencesForArgs();
- if( DEBUG_RA)
+ if (DEBUG_RA)
cerr << "Interference graphs calculted!\n";
}
assert((LROfOp1 || !It1.isDef()) && "No LR for Def in PSEUDO insruction");
MachineInstr::const_val_op_iterator It2 = It1;
- for(++It2; It2 != ItE; ++It2) {
+ for (++It2; It2 != ItE; ++It2) {
const LiveRange *LROfOp2 = LRI.getLiveRangeForValue(*It2);
if (LROfOp2) {
RegClass *RCOfOp1 = LROfOp1->getRegClass();
RegClass *RCOfOp2 = LROfOp2->getRegClass();
- if( RCOfOp1 == RCOfOp2 ){
+ if (RCOfOp1 == RCOfOp2 ){
RCOfOp1->setInterference( LROfOp1, LROfOp2 );
setInterf = true;
}
//----------------------------------------------------------------------------
void PhyRegAlloc::addInterferencesForArgs() {
// get the InSet of root BB
- const ValueSet &InSet = LVI->getInSetOfBB(Meth->front());
-
- // get the argument list
- const Function::ArgumentListType &ArgList = Meth->getArgumentList();
-
- // get an iterator to arg list
- Function::ArgumentListType::const_iterator ArgIt = ArgList.begin();
-
+ const ValueSet &InSet = LVI->getInSetOfBB(&Meth->front());
- for( ; ArgIt != ArgList.end() ; ++ArgIt) { // for each argument
- addInterference((Value*)*ArgIt, &InSet, false);// add interferences between
- // args and LVars at start
- if( DEBUG_RA > 1)
- cerr << " - %% adding interference for argument "
- << RAV((const Value *)*ArgIt) << "\n";
+ for (Function::const_aiterator AI = Meth->abegin(); AI != Meth->aend(); ++AI) {
+ // add interferences between args and LVars at start
+ addInterference(AI, &InSet, false);
+
+ if (DEBUG_RA >= RA_DEBUG_Verbose)
+ cerr << " - %% adding interference for argument " << RAV(AI) << "\n";
}
}
// Utility functions used below
//-----------------------------
inline void
-PrependInstructions(std::deque<MachineInstr *> &IBef,
+PrependInstructions(vector<MachineInstr *> &IBef,
MachineCodeForBasicBlock& MIVec,
MachineCodeForBasicBlock::iterator& MII,
const std::string& msg)
if (!IBef.empty())
{
MachineInstr* OrigMI = *MII;
- std::deque<MachineInstr *>::iterator AdIt;
+ std::vector<MachineInstr *>::iterator AdIt;
for (AdIt = IBef.begin(); AdIt != IBef.end() ; ++AdIt)
{
if (DEBUG_RA) {
}
inline void
-AppendInstructions(std::deque<MachineInstr *> &IAft,
+AppendInstructions(std::vector<MachineInstr *> &IAft,
MachineCodeForBasicBlock& MIVec,
MachineCodeForBasicBlock::iterator& MII,
const std::string& msg)
if (!IAft.empty())
{
MachineInstr* OrigMI = *MII;
- std::deque<MachineInstr *>::iterator AdIt;
- for( AdIt = IAft.begin(); AdIt != IAft.end() ; ++AdIt )
+ std::vector<MachineInstr *>::iterator AdIt;
+ for ( AdIt = IAft.begin(); AdIt != IAft.end() ; ++AdIt )
{
- if(DEBUG_RA) {
+ if (DEBUG_RA) {
if (OrigMI) cerr << "For MInst: " << *OrigMI;
cerr << msg << " APPENDed instr: " << **AdIt << "\n";
}
void PhyRegAlloc::updateMachineCode()
{
- const BasicBlock* entryBB = Meth->getEntryNode();
- if (entryBB) {
- MachineCodeForBasicBlock& MIVec = entryBB->getMachineInstrVec();
- MachineCodeForBasicBlock::iterator MII = MIVec.begin();
+ MachineCodeForBasicBlock& MIVec = MachineCodeForBasicBlock::get(&Meth->getEntryNode());
- // Insert any instructions needed at method entry
- PrependInstructions(AddedInstrAtEntry.InstrnsBefore, MIVec, MII,
- "At function entry: \n");
- assert(AddedInstrAtEntry.InstrnsAfter.empty() &&
- "InstrsAfter should be unnecessary since we are just inserting at "
- "the function entry point here.");
- }
+ // Insert any instructions needed at method entry
+ MachineCodeForBasicBlock::iterator MII = MIVec.begin();
+ PrependInstructions(AddedInstrAtEntry.InstrnsBefore, MIVec, MII,
+ "At function entry: \n");
+ assert(AddedInstrAtEntry.InstrnsAfter.empty() &&
+ "InstrsAfter should be unnecessary since we are just inserting at "
+ "the function entry point here.");
for (Function::const_iterator BBI = Meth->begin(), BBE = Meth->end();
BBI != BBE; ++BBI) {
// iterate over all the machine instructions in BB
- MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
- for(MachineCodeForBasicBlock::iterator MII = MIVec.begin();
+ MachineCodeForBasicBlock &MIVec = MachineCodeForBasicBlock::get(BBI);
+ for (MachineCodeForBasicBlock::iterator MII = MIVec.begin();
MII != MIVec.end(); ++MII) {
MachineInstr *MInst = *MII;
if (TM.getInstrInfo().isDummyPhiInstr(Opcode))
continue;
+ // Reset tmp stack positions so they can be reused for each machine instr.
+ mcInfo.popAllTempValues(TM);
+
// Now insert speical instructions (if necessary) for call/return
// instructions.
//
AddedInstrns &AI = AddedInstrMap[MInst];
- // Tmp stack poistions are needed by some calls that have spilled args
- // So reset it before we call each such method
- //
- mcInfo.popAllTempValues(TM);
-
if (TM.getInstrInfo().isCall(Opcode))
- MRI.colorCallArgs(MInst, LRI, &AI, *this, *BBI);
+ MRI.colorCallArgs(MInst, LRI, &AI, *this, BBI);
else if (TM.getInstrInfo().isReturn(Opcode))
MRI.colorRetValue(MInst, LRI, &AI);
}
-
- /* -- Using above code instead of this
-
- // if this machine instr is call, insert caller saving code
-
- if( (TM.getInstrInfo()).isCall( MInst->getOpCode()) )
- MRI.insertCallerSavingCode(MInst, *BBI, *this );
-
- */
-
+ // Set the registers for operands in the machine instruction
+ // if a register was successfully allocated. If not, insert
+ // code to spill the register value.
+ //
+ for (unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum)
+ {
+ MachineOperand& Op = MInst->getOperand(OpNum);
+ if (Op.getOperandType() == MachineOperand::MO_VirtualRegister ||
+ Op.getOperandType() == MachineOperand::MO_CCRegister)
+ {
+ const Value *const Val = Op.getVRegValue();
+
+ LiveRange *const LR = LRI.getLiveRangeForValue(Val);
+ if (!LR) // consts or labels will have no live range
+ {
+ // if register is not allocated, mark register as invalid
+ if (Op.getAllocatedRegNum() == -1)
+ MInst->SetRegForOperand(OpNum, MRI.getInvalidRegNum());
+ continue;
+ }
+
+ if (LR->hasColor() )
+ MInst->SetRegForOperand(OpNum,
+ MRI.getUnifiedRegNum(LR->getRegClass()->getID(),
+ LR->getColor()));
+ else
+ // LR did NOT receive a color (register). Insert spill code.
+ insertCode4SpilledLR(LR, MInst, BBI, OpNum );
+ }
+ } // for each operand
- // reset the stack offset for temporary variables since we may
- // need that to spill
- // mcInfo.popAllTempValues(TM);
- // TODO ** : do later
- //for(MachineInstr::val_const_op_iterator OpI(MInst);!OpI.done();++OpI) {
-
-
- // Now replace set the registers for operands in the machine instruction
- //
- for(unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum) {
-
- MachineOperand& Op = MInst->getOperand(OpNum);
-
- if( Op.getOperandType() == MachineOperand::MO_VirtualRegister ||
- Op.getOperandType() == MachineOperand::MO_CCRegister) {
-
- const Value *const Val = Op.getVRegValue();
-
- // delete this condition checking later (must assert if Val is null)
- if( !Val) {
- if (DEBUG_RA)
- cerr << "Warning: NULL Value found for operand\n";
- continue;
- }
- assert( Val && "Value is NULL");
-
- LiveRange *const LR = LRI.getLiveRangeForValue(Val);
-
- if ( !LR ) {
-
- // nothing to worry if it's a const or a label
-
- if (DEBUG_RA) {
- cerr << "*NO LR for operand : " << Op ;
- cerr << " [reg:" << Op.getAllocatedRegNum() << "]";
- cerr << " in inst:\t" << *MInst << "\n";
- }
-
- // if register is not allocated, mark register as invalid
- if( Op.getAllocatedRegNum() == -1)
- Op.setRegForValue( MRI.getInvalidRegNum());
-
-
- continue;
- }
-
- unsigned RCID = (LR->getRegClass())->getID();
-
- if( LR->hasColor() ) {
- Op.setRegForValue( MRI.getUnifiedRegNum(RCID, LR->getColor()) );
- }
- else {
-
- // LR did NOT receive a color (register). Now, insert spill code
- // for spilled opeands in this machine instruction
-
- //assert(0 && "LR must be spilled");
- insertCode4SpilledLR(LR, MInst, *BBI, OpNum );
-
- }
- }
-
- } // for each operand
-
-
// Now add instructions that the register allocator inserts before/after
// this machine instructions (done only for calls/rets/incoming args)
// We do this here, to ensure that spill for an instruction is inserted
// If there are instructions to be added, *before* this machine
// instruction, add them now.
//
- if(AddedInstrMap.count(MInst)) {
+ if (AddedInstrMap.count(MInst)) {
PrependInstructions(AddedInstrMap[MInst].InstrnsBefore, MIVec, MII,"");
}
unsigned delay;
if ((delay=TM.getInstrInfo().getNumDelaySlots(MInst->getOpCode())) >0){
move2DelayedInstr(MInst, *(MII+delay) );
-
- if(DEBUG_RA) cerr<< "\nMoved an added instr after the delay slot";
}
-
else {
// Here we can add the "instructions after" to the current
// instruction since there are no delay slots for this instruction
AppendInstructions(AddedInstrMap[MInst].InstrnsAfter, MIVec, MII,"");
} // if not delay
-
}
} // for each machine instruction
MachineOperand& Op = MInst->getOperand(OpNum);
bool isDef = MInst->operandIsDefined(OpNum);
+ bool isDefAndUse = MInst->operandIsDefinedAndUsed(OpNum);
unsigned RegType = MRI.getRegType( LR );
int SpillOff = LR->getSpillOffFromFP();
RegClass *RC = LR->getRegClass();
mcInfo.pushTempValue(TM, MRI.getSpilledRegSize(RegType) );
- MachineInstr *MIBef=NULL, *AdIMid=NULL, *MIAft=NULL;
+ vector<MachineInstr*> MIBef, MIAft;
+ vector<MachineInstr*> AdIMid;
- int TmpRegU = getUsableUniRegAtMI(RC, RegType, MInst,&LVSetBef, MIBef, MIAft);
+ // Choose a register to hold the spilled value. This may insert code
+ // before and after MInst to free up the value. If so, this code should
+ // be first and last in the spill sequence before/after MInst.
+ int TmpRegU = getUsableUniRegAtMI(RegType, &LVSetBef, MInst, MIBef, MIAft);
- // get the added instructions for this instruciton
+ // Set the operand first so that it this register does not get used
+ // as a scratch register for later calls to getUsableUniRegAtMI below
+ MInst->SetRegForOperand(OpNum, TmpRegU);
+
+ // get the added instructions for this instruction
AddedInstrns &AI = AddedInstrMap[MInst];
-
- if (!isDef) {
+
+ // We may need a scratch register to copy the spilled value to/from memory.
+ // This may itself have to insert code to free up a scratch register.
+ // Any such code should go before (after) the spill code for a load (store).
+ int scratchRegType = -1;
+ int scratchReg = -1;
+ if (MRI.regTypeNeedsScratchReg(RegType, scratchRegType))
+ {
+ scratchReg = this->getUsableUniRegAtMI(scratchRegType, &LVSetBef,
+ MInst, MIBef, MIAft);
+ assert(scratchReg != MRI.getInvalidRegNum());
+ MInst->getRegsUsed().insert(scratchReg);
+ }
+
+ if (!isDef || isDefAndUse) {
// for a USE, we have to load the value of LR from stack to a TmpReg
// and use the TmpReg as one operand of instruction
-
- // actual loading instruction
- AdIMid = MRI.cpMem2RegMI(MRI.getFramePointer(), SpillOff, TmpRegU,RegType);
-
- if(MIBef)
- AI.InstrnsBefore.push_back(MIBef);
-
- AI.InstrnsBefore.push_back(AdIMid);
-
- if(MIAft)
- AI.InstrnsAfter.push_front(MIAft);
- } else { // if this is a Def
+ // actual loading instruction(s)
+ MRI.cpMem2RegMI(AdIMid, MRI.getFramePointer(), SpillOff, TmpRegU, RegType,
+ scratchReg);
+
+ // the actual load should be after the instructions to free up TmpRegU
+ MIBef.insert(MIBef.end(), AdIMid.begin(), AdIMid.end());
+ AdIMid.clear();
+ }
+
+ if (isDef) { // if this is a Def
// for a DEF, we have to store the value produced by this instruction
// on the stack position allocated for this LR
-
- // actual storing instruction
- AdIMid = MRI.cpReg2MemMI(TmpRegU, MRI.getFramePointer(), SpillOff,RegType);
-
- if (MIBef)
- AI.InstrnsBefore.push_back(MIBef);
-
- AI.InstrnsAfter.push_front(AdIMid);
-
- if (MIAft)
- AI.InstrnsAfter.push_front(MIAft);
-
+
+ // actual storing instruction(s)
+ MRI.cpReg2MemMI(AdIMid, TmpRegU, MRI.getFramePointer(), SpillOff, RegType,
+ scratchReg);
+
+ MIAft.insert(MIAft.begin(), AdIMid.begin(), AdIMid.end());
} // if !DEF
-
- cerr << "\nFor Inst " << *MInst;
- cerr << " - SPILLED LR: "; printSet(*LR);
- cerr << "\n - Added Instructions:";
- if (MIBef) cerr << *MIBef;
- cerr << *AdIMid;
- if (MIAft) cerr << *MIAft;
-
- Op.setRegForValue(TmpRegU); // set the opearnd
+
+ // Finally, insert the entire spill code sequences before/after MInst
+ AI.InstrnsBefore.insert(AI.InstrnsBefore.end(), MIBef.begin(), MIBef.end());
+ AI.InstrnsAfter.insert(AI.InstrnsAfter.begin(), MIAft.begin(), MIAft.end());
+
+ if (DEBUG_RA) {
+ cerr << "\nFor Inst " << *MInst;
+ cerr << " - SPILLED LR: "; printSet(*LR);
+ cerr << "\n - Added Instructions:";
+ for_each(MIBef.begin(), MIBef.end(), std::mem_fun(&MachineInstr::dump));
+ for_each(MIAft.begin(), MIAft.end(), std::mem_fun(&MachineInstr::dump));
+ }
}
-
//----------------------------------------------------------------------------
// We can use the following method to get a temporary register to be used
// BEFORE any given machine instruction. If there is a register available,
// Returned register number is the UNIFIED register number
//----------------------------------------------------------------------------
-int PhyRegAlloc::getUsableUniRegAtMI(RegClass *RC,
- const int RegType,
- const MachineInstr *MInst,
- const ValueSet *LVSetBef,
- MachineInstr *&MIBef,
- MachineInstr *&MIAft) {
-
+int PhyRegAlloc::getUsableUniRegAtMI(const int RegType,
+ const ValueSet *LVSetBef,
+ MachineInstr *MInst,
+ std::vector<MachineInstr*>& MIBef,
+ std::vector<MachineInstr*>& MIAft) {
+
+ RegClass* RC = this->getRegClassByID(MRI.getRegClassIDOfRegType(RegType));
+
int RegU = getUnusedUniRegAtMI(RC, MInst, LVSetBef);
-
-
- if( RegU != -1) {
- // we found an unused register, so we can simply use it
- MIBef = MIAft = NULL;
- }
- else {
+
+ if (RegU == -1) {
// we couldn't find an unused register. Generate code to free up a reg by
// saving it on stack and restoring after the instruction
-
+
int TmpOff = mcInfo.pushTempValue(TM, MRI.getSpilledRegSize(RegType) );
RegU = getUniRegNotUsedByThisInst(RC, MInst);
- MIBef = MRI.cpReg2MemMI(RegU, MRI.getFramePointer(), TmpOff, RegType );
- MIAft = MRI.cpMem2RegMI(MRI.getFramePointer(), TmpOff, RegU, RegType );
+
+ // Check if we need a scratch register to copy this register to memory.
+ int scratchRegType = -1;
+ if (MRI.regTypeNeedsScratchReg(RegType, scratchRegType))
+ {
+ int scratchReg = this->getUsableUniRegAtMI(scratchRegType, LVSetBef,
+ MInst, MIBef, MIAft);
+ assert(scratchReg != MRI.getInvalidRegNum());
+
+ // We may as well hold the value in the scratch register instead
+ // of copying it to memory and back. But we have to mark the
+ // register as used by this instruction, so it does not get used
+ // as a scratch reg. by another operand or anyone else.
+ MInst->getRegsUsed().insert(scratchReg);
+ MRI.cpReg2RegMI(MIBef, RegU, scratchReg, RegType);
+ MRI.cpReg2RegMI(MIAft, scratchReg, RegU, RegType);
+ }
+ else
+ { // the register can be copied directly to/from memory so do it.
+ MRI.cpReg2MemMI(MIBef, RegU, MRI.getFramePointer(), TmpOff, RegType);
+ MRI.cpMem2RegMI(MIAft, MRI.getFramePointer(), TmpOff, RegU, RegType);
+ }
}
-
+
return RegU;
}
unsigned NumAvailRegs = RC->getNumOfAvailRegs();
- bool *IsColorUsedArr = RC->getIsColorUsedArr();
+ std::vector<bool> &IsColorUsedArr = RC->getIsColorUsedArr();
- for(unsigned i=0; i < NumAvailRegs; i++) // Reset array
+ for (unsigned i=0; i < NumAvailRegs; i++) // Reset array
IsColorUsedArr[i] = false;
ValueSet::const_iterator LIt = LVSetBef->begin();
// for each live var in live variable set after machine inst
- for( ; LIt != LVSetBef->end(); ++LIt) {
+ for ( ; LIt != LVSetBef->end(); ++LIt) {
// get the live range corresponding to live var
LiveRange *const LRofLV = LRI.getLiveRangeForValue(*LIt );
// LR can be null if it is a const since a const
// doesn't have a dominating def - see Assumptions above
- if( LRofLV )
- if( LRofLV->hasColor() )
- IsColorUsedArr[ LRofLV->getColor() ] = true;
+ if (LRofLV && LRofLV->getRegClass() == RC && LRofLV->hasColor() )
+ IsColorUsedArr[ LRofLV->getColor() ] = true;
}
// It is possible that one operand of this MInst was already spilled
setRelRegsUsedByThisInst(RC, MInst);
- unsigned c; // find first unused color
- for( c=0; c < NumAvailRegs; c++)
- if( ! IsColorUsedArr[ c ] ) break;
-
- if(c < NumAvailRegs)
- return MRI.getUnifiedRegNum(RC->getID(), c);
- else
- return -1;
-
-
+ for (unsigned c=0; c < NumAvailRegs; c++) // find first unused color
+ if (!IsColorUsedArr[c])
+ return MRI.getUnifiedRegNum(RC->getID(), c);
+
+ return -1;
}
// by operands of a machine instruction. Returns the unified reg number.
//----------------------------------------------------------------------------
int PhyRegAlloc::getUniRegNotUsedByThisInst(RegClass *RC,
- const MachineInstr *MInst) {
+ const MachineInstr *MInst) {
- bool *IsColorUsedArr = RC->getIsColorUsedArr();
+ vector<bool> &IsColorUsedArr = RC->getIsColorUsedArr();
unsigned NumAvailRegs = RC->getNumOfAvailRegs();
-
- for(unsigned i=0; i < NumAvailRegs ; i++) // Reset array
+ for (unsigned i=0; i < NumAvailRegs ; i++) // Reset array
IsColorUsedArr[i] = false;
setRelRegsUsedByThisInst(RC, MInst);
- unsigned c; // find first unused color
- for( c=0; c < RC->getNumOfAvailRegs(); c++)
- if( ! IsColorUsedArr[ c ] ) break;
-
- if(c < NumAvailRegs)
- return MRI.getUnifiedRegNum(RC->getID(), c);
- else
- assert( 0 && "FATAL: No free register could be found in reg class!!");
+ for (unsigned c=0; c < RC->getNumOfAvailRegs(); c++)// find first unused color
+ if (!IsColorUsedArr[c])
+ return MRI.getUnifiedRegNum(RC->getID(), c);
+
+ assert(0 && "FATAL: No free register could be found in reg class!!");
return 0;
}
// instructions. Both explicit and implicit operands are set.
//----------------------------------------------------------------------------
void PhyRegAlloc::setRelRegsUsedByThisInst(RegClass *RC,
- const MachineInstr *MInst ) {
+ const MachineInstr *MInst ) {
- bool *IsColorUsedArr = RC->getIsColorUsedArr();
+ vector<bool> &IsColorUsedArr = RC->getIsColorUsedArr();
- for(unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum) {
-
- const MachineOperand& Op = MInst->getOperand(OpNum);
-
- if( Op.getOperandType() == MachineOperand::MO_VirtualRegister ||
- Op.getOperandType() == MachineOperand::MO_CCRegister ) {
-
- const Value *const Val = Op.getVRegValue();
-
- if( Val )
- if( MRI.getRegClassIDOfValue(Val) == RC->getID() ) {
- int Reg;
- if( (Reg=Op.getAllocatedRegNum()) != -1) {
- IsColorUsedArr[ Reg ] = true;
- }
- else {
- // it is possilbe that this operand still is not marked with
- // a register but it has a LR and that received a color
-
- LiveRange *LROfVal = LRI.getLiveRangeForValue(Val);
- if( LROfVal)
- if( LROfVal->hasColor() )
- IsColorUsedArr[ LROfVal->getColor() ] = true;
- }
-
- } // if reg classes are the same
+ // Add the registers already marked as used by the instruction.
+ // This should include any scratch registers that are used to save
+ // values across the instruction (e.g., for saving state register values).
+ const hash_set<int>& regsUsed = MInst->getRegsUsed();
+ for (hash_set<int>::const_iterator SI=regsUsed.begin(), SE=regsUsed.end();
+ SI != SE; ++SI)
+ {
+ unsigned classId = 0;
+ int classRegNum = MRI.getClassRegNum(*SI, classId);
+ if (RC->getID() == classId)
+ {
+ assert(classRegNum < (int) IsColorUsedArr.size() &&
+ "Illegal register number for this reg class?");
+ IsColorUsedArr[classRegNum] = true;
+ }
}
- else if (Op.getOperandType() == MachineOperand::MO_MachineRegister) {
- IsColorUsedArr[ Op.getMachineRegNum() ] = true;
+
+ // Now add registers allocated to the live ranges of values used in
+ // the instruction. These are not yet recorded in the instruction.
+ for (unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum)
+ {
+ const MachineOperand& Op = MInst->getOperand(OpNum);
+
+ if (Op.getOperandType() == MachineOperand::MO_VirtualRegister ||
+ Op.getOperandType() == MachineOperand::MO_CCRegister)
+ if (const Value* Val = Op.getVRegValue())
+ if (MRI.getRegClassIDOfValue(Val) == RC->getID())
+ if (Op.getAllocatedRegNum() == -1)
+ if (LiveRange *LROfVal = LRI.getLiveRangeForValue(Val))
+ if (LROfVal->hasColor() )
+ // this operand is in a LR that received a color
+ IsColorUsedArr[LROfVal->getColor()] = true;
}
- }
-
- // If there are implicit references, mark them as well
-
- for(unsigned z=0; z < MInst->getNumImplicitRefs(); z++) {
-
- LiveRange *const LRofImpRef =
- LRI.getLiveRangeForValue( MInst->getImplicitRef(z) );
-
- if(LRofImpRef && LRofImpRef->hasColor())
- IsColorUsedArr[LRofImpRef->getColor()] = true;
- }
+
+ // If there are implicit references, mark their allocated regs as well
+ //
+ for (unsigned z=0; z < MInst->getNumImplicitRefs(); z++)
+ if (const LiveRange*
+ LRofImpRef = LRI.getLiveRangeForValue(MInst->getImplicitRef(z)))
+ if (LRofImpRef->hasColor())
+ // this implicit reference is in a LR that received a color
+ IsColorUsedArr[LRofImpRef->getColor()] = true;
}
-
-
-
-
-
-
//----------------------------------------------------------------------------
// If there are delay slots for an instruction, the instructions
// added after it must really go after the delayed instruction(s).
const MachineInstr *DelayedMI) {
// "added after" instructions of the original instr
- std::deque<MachineInstr *> &OrigAft = AddedInstrMap[OrigMI].InstrnsAfter;
+ std::vector<MachineInstr *> &OrigAft = AddedInstrMap[OrigMI].InstrnsAfter;
// "added instructions" of the delayed instr
AddedInstrns &DelayAdI = AddedInstrMap[DelayedMI];
// "added after" instructions of the delayed instr
- std::deque<MachineInstr *> &DelayedAft = DelayAdI.InstrnsAfter;
+ std::vector<MachineInstr *> &DelayedAft = DelayAdI.InstrnsAfter;
// go thru all the "added after instructions" of the original instruction
// and append them to the "addded after instructions" of the delayed
for (Function::const_iterator BBI = Meth->begin(), BBE = Meth->end();
BBI != BBE; ++BBI) {
- cerr << "\n"; printLabel(*BBI); cerr << ": ";
+ cerr << "\n"; printLabel(BBI); cerr << ": ";
// get the iterator for machine instructions
- MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
+ MachineCodeForBasicBlock& MIVec = MachineCodeForBasicBlock::get(BBI);
MachineCodeForBasicBlock::iterator MII = MIVec.begin();
// iterate over all the machine instructions in BB
- for( ; MII != MIVec.end(); ++MII) {
+ for ( ; MII != MIVec.end(); ++MII) {
MachineInstr *const MInst = *MII;
cerr << "\n\t";
cerr << TargetInstrDescriptors[MInst->getOpCode()].opCodeString;
- for(unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum) {
+ for (unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum) {
MachineOperand& Op = MInst->getOperand(OpNum);
- if( Op.getOperandType() == MachineOperand::MO_VirtualRegister ||
+ if (Op.getOperandType() == MachineOperand::MO_VirtualRegister ||
Op.getOperandType() == MachineOperand::MO_CCRegister /*||
Op.getOperandType() == MachineOperand::MO_PCRelativeDisp*/ ) {
const Value *const Val = Op.getVRegValue () ;
// ****this code is temporary till NULL Values are fixed
- if( ! Val ) {
+ if (! Val ) {
cerr << "\t<*NULL*>";
continue;
}
// if a label or a constant
- if(isa<BasicBlock>(Val)) {
+ if (isa<BasicBlock>(Val)) {
cerr << "\t"; printLabel( Op.getVRegValue () );
} else {
// else it must be a register value
else
cerr << "(" << Val << ")";
- if( Op.opIsDef() )
+ if (Op.opIsDef() )
cerr << "*";
const LiveRange *LROfVal = LRI.getLiveRangeForValue(Val);
- if( LROfVal )
- if( LROfVal->hasSpillOffset() )
+ if (LROfVal )
+ if (LROfVal->hasSpillOffset() )
cerr << "$";
}
}
- else if(Op.getOperandType() == MachineOperand::MO_MachineRegister) {
+ else if (Op.getOperandType() == MachineOperand::MO_MachineRegister) {
cerr << "\t" << "%" << MRI.getUnifiedRegName(Op.getMachineRegNum());
}
unsigned NumOfImpRefs = MInst->getNumImplicitRefs();
- if( NumOfImpRefs > 0) {
+ if (NumOfImpRefs > 0) {
cerr << "\tImplicit:";
- for(unsigned z=0; z < NumOfImpRefs; z++)
+ for (unsigned z=0; z < NumOfImpRefs; z++)
cerr << RAV(MInst->getImplicitRef(z)) << "\t";
}
}
-#if 0
-
-//----------------------------------------------------------------------------
-//
-//----------------------------------------------------------------------------
-
-void PhyRegAlloc::colorCallRetArgs()
-{
-
- CallRetInstrListType &CallRetInstList = LRI.getCallRetInstrList();
- CallRetInstrListType::const_iterator It = CallRetInstList.begin();
-
- for( ; It != CallRetInstList.end(); ++It ) {
-
- const MachineInstr *const CRMI = *It;
- unsigned OpCode = CRMI->getOpCode();
-
- // get the added instructions for this Call/Ret instruciton
- AddedInstrns &AI = AddedInstrMap[CRMI];
-
- // Tmp stack positions are needed by some calls that have spilled args
- // So reset it before we call each such method
- //mcInfo.popAllTempValues(TM);
-
-
- if (TM.getInstrInfo().isCall(OpCode))
- MRI.colorCallArgs(CRMI, LRI, &AI, *this);
- else if (TM.getInstrInfo().isReturn(OpCode))
- MRI.colorRetValue(CRMI, LRI, &AI);
- else
- assert(0 && "Non Call/Ret instrn in CallRetInstrList\n");
- }
-}
-
-#endif
-
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
void PhyRegAlloc::colorIncomingArgs()
{
- const BasicBlock *const FirstBB = Meth->front();
- const MachineInstr *FirstMI = FirstBB->getMachineInstrVec().front();
+ const BasicBlock &FirstBB = Meth->front();
+ const MachineInstr *FirstMI = MachineCodeForBasicBlock::get(&FirstBB).front();
assert(FirstMI && "No machine instruction in entry BB");
MRI.colorMethodArgs(Meth, LRI, &AddedInstrAtEntry);
void PhyRegAlloc::markUnusableSugColors()
{
- if(DEBUG_RA ) cerr << "\nmarking unusable suggested colors ...\n";
+ if (DEBUG_RA ) cerr << "\nmarking unusable suggested colors ...\n";
// hash map iterator
LiveRangeMapType::const_iterator HMI = (LRI.getLiveRangeMap())->begin();
LiveRangeMapType::const_iterator HMIEnd = (LRI.getLiveRangeMap())->end();
- for(; HMI != HMIEnd ; ++HMI ) {
+ for (; HMI != HMIEnd ; ++HMI ) {
if (HMI->first) {
LiveRange *L = HMI->second; // get the LiveRange
if (L) {
- if(L->hasSuggestedColor()) {
+ if (L->hasSuggestedColor()) {
int RCID = L->getRegClass()->getID();
- if( MRI.isRegVolatile( RCID, L->getSuggestedColor()) &&
+ if (MRI.isRegVolatile( RCID, L->getSuggestedColor()) &&
L->isCallInterference() )
L->setSuggestedColorUsable( false );
else
LiveRangeMapType::const_iterator HMI = LRI.getLiveRangeMap()->begin();
LiveRangeMapType::const_iterator HMIEnd = LRI.getLiveRangeMap()->end();
- for( ; HMI != HMIEnd ; ++HMI) {
+ for ( ; HMI != HMIEnd ; ++HMI) {
if (HMI->first && HMI->second) {
LiveRange *L = HMI->second; // get the LiveRange
if (!L->hasColor()) // NOTE: ** allocating the size of long Type **
if (DEBUG_RA) {
// print all LRs in all reg classes
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
- RegClassList[ rc ]->printIGNodeList();
+ for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)
+ RegClassList[rc]->printIGNodeList();
// print IGs in all register classes
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
- RegClassList[ rc ]->printIG();
+ for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)
+ RegClassList[rc]->printIG();
}
LRI.coalesceLRs(); // coalesce all live ranges
- if( DEBUG_RA) {
+ if (DEBUG_RA) {
// print all LRs in all reg classes
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
+ for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)
RegClassList[ rc ]->printIGNodeList();
// print IGs in all register classes
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
+ for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)
RegClassList[ rc ]->printIG();
}
markUnusableSugColors();
// color all register classes using the graph coloring algo
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
+ for (unsigned rc=0; rc < NumOfRegClasses ; rc++)
RegClassList[ rc ]->colorAllRegs();
// Atter grpah coloring, if some LRs did not receive a color (i.e, spilled)
projects / oota-llvm.git / blobdiff