-// $Id$
-//***************************************************************************
-// File:
-// PhyRegAlloc.cpp
+//===-- PhyRegAlloc.cpp ---------------------------------------------------===//
//
-// Purpose:
-// Register allocation for LLVM.
-//
-// History:
-// 9/10/01 - Ruchira Sasanka - created.
-//**************************************************************************/
+// Register allocation for LLVM.
+//
+//===----------------------------------------------------------------------===//
+#include "llvm/CodeGen/RegisterAllocation.h"
+#include "llvm/CodeGen/RegAllocCommon.h"
#include "llvm/CodeGen/PhyRegAlloc.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrAnnot.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/Analysis/LiveVar/FunctionLiveVarInfo.h"
+#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/MachineFrameInfo.h"
+#include "llvm/Target/MachineInstrInfo.h"
+#include "llvm/Function.h"
+#include "llvm/Type.h"
+#include "llvm/iOther.h"
+#include "Support/STLExtras.h"
+#include "Support/CommandLine.h"
#include <math.h>
+using std::cerr;
+using std::vector;
+
+RegAllocDebugLevel_t DEBUG_RA;
+
+static cl::opt<RegAllocDebugLevel_t, true>
+DRA_opt("dregalloc", cl::Hidden, cl::location(DEBUG_RA),
+ cl::desc("enable register allocation debugging information"),
+ cl::values(
+ clEnumValN(RA_DEBUG_None , "n", "disable debug output"),
+ clEnumValN(RA_DEBUG_Results, "y", "debug output for allocation results"),
+ clEnumValN(RA_DEBUG_Coloring, "c", "debug output for graph coloring step"),
+ clEnumValN(RA_DEBUG_Interference,"ig","debug output for interference graphs"),
+ clEnumValN(RA_DEBUG_LiveRanges , "lr","debug output for live ranges"),
+ clEnumValN(RA_DEBUG_Verbose, "v", "extra debug output"),
+ 0));
+//----------------------------------------------------------------------------
+// RegisterAllocation pass front end...
+//----------------------------------------------------------------------------
+namespace {
+ class RegisterAllocator : public FunctionPass {
+ TargetMachine &Target;
+ public:
+ inline RegisterAllocator(TargetMachine &T) : Target(T) {}
-// ***TODO: There are several places we add instructions. Validate the order
-// of adding these instructions.
-
-
+ const char *getPassName() const { return "Register Allocation"; }
+
+ bool runOnFunction(Function &F) {
+ if (DEBUG_RA)
+ cerr << "\n********* Function "<< F.getName() << " ***********\n";
+
+ PhyRegAlloc PRA(&F, Target, &getAnalysis<FunctionLiveVarInfo>(),
+ &getAnalysis<LoopInfo>());
+ PRA.allocateRegisters();
+
+ if (DEBUG_RA) cerr << "\nRegister allocation complete!\n";
+ return false;
+ }
-cl::Enum<RegAllocDebugLevel_t> DEBUG_RA("dregalloc", cl::NoFlags,
- "enable register allocation debugging information",
- clEnumValN(RA_DEBUG_None , "n", "disable debug output"),
- clEnumValN(RA_DEBUG_Normal , "y", "enable debug output"),
- clEnumValN(RA_DEBUG_Verbose, "v", "enable extra debug output"), 0);
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<LoopInfo>();
+ AU.addRequired<FunctionLiveVarInfo>();
+ }
+ };
+}
+Pass *getRegisterAllocator(TargetMachine &T) {
+ return new RegisterAllocator(T);
+}
//----------------------------------------------------------------------------
// Constructor: Init local composite objects and create register classes.
//----------------------------------------------------------------------------
-PhyRegAlloc::PhyRegAlloc(Method *M,
- const TargetMachine& tm,
- MethodLiveVarInfo *const Lvi)
- : RegClassList(),
- TM(tm),
- Meth(M),
- mcInfo(MachineCodeForMethod::get(M)),
- LVI(Lvi), LRI(M, tm, RegClassList),
- MRI( tm.getRegInfo() ),
- NumOfRegClasses(MRI.getNumOfRegClasses()),
- AddedInstrMap(), LoopDepthCalc(M), ResColList() {
+PhyRegAlloc::PhyRegAlloc(Function *F, const TargetMachine& tm,
+ FunctionLiveVarInfo *Lvi, LoopInfo *LDC)
+ : TM(tm), Fn(F), MF(MachineFunction::get(F)), LVI(Lvi),
+ LRI(F, tm, RegClassList), MRI(tm.getRegInfo()),
+ NumOfRegClasses(MRI.getNumOfRegClasses()), LoopDepthCalc(LDC) {
// create each RegisterClass and put in RegClassList
//
- for( unsigned int rc=0; rc < NumOfRegClasses; rc++)
- RegClassList.push_back( new RegClass(M, MRI.getMachineRegClass(rc),
- &ResColList) );
+ 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 rc=0; rc < NumOfRegClasses; rc++)
+ delete RegClassList[rc];
- for( unsigned int rc=0; rc < NumOfRegClasses; rc++) {
- RegClass *RC = RegClassList[rc];
- delete RC;
- }
+ AddedInstrMap.clear();
}
//----------------------------------------------------------------------------
// This method initally creates interference graphs (one in each reg class)
// and IGNodeList (one in each IG). The actual nodes will be pushed later.
//----------------------------------------------------------------------------
-void PhyRegAlloc::createIGNodeListsAndIGs()
-{
- if(DEBUG_RA ) cout << "Creating LR lists ..." << endl;
+void PhyRegAlloc::createIGNodeListsAndIGs() {
+ if (DEBUG_RA >= RA_DEBUG_LiveRanges) cerr << "Creating LR lists ...\n";
// hash map iterator
- LiveRangeMapType::const_iterator HMI = (LRI.getLiveRangeMap())->begin();
+ LiveRangeMapType::const_iterator HMI = LRI.getLiveRangeMap()->begin();
// hash map end
- LiveRangeMapType::const_iterator HMIEnd = (LRI.getLiveRangeMap())->end();
-
- for( ; HMI != HMIEnd ; ++HMI ) {
-
- if( (*HMI).first ) {
-
- LiveRange *L = (*HMI).second; // get the LiveRange
+ LiveRangeMapType::const_iterator HMIEnd = LRI.getLiveRangeMap()->end();
+
+ for (; HMI != HMIEnd ; ++HMI ) {
+ if (HMI->first) {
+ LiveRange *L = HMI->second; // get the LiveRange
+ if (!L) {
+ if (DEBUG_RA)
+ cerr << "\n**** ?!?WARNING: NULL LIVE RANGE FOUND FOR: "
+ << RAV(HMI->first) << "****\n";
+ continue;
+ }
- if( !L) {
- if( DEBUG_RA) {
- cout << "\n*?!?Warning: Null liver range found for: ";
- printValue( (*HMI).first) ; cout << endl;
- }
- continue;
- }
- // if the Value * is not null, and LR
- // is not yet written to the IGNodeList
- if( !(L->getUserIGNode()) ) {
-
- RegClass *const RC = // RegClass of first value in the LR
- //RegClassList [MRI.getRegClassIDOfValue(*(L->begin()))];
- RegClassList[ L->getRegClass()->getID() ];
-
- RC-> addLRToIG( L ); // add this LR to an IG
- }
+ // if the Value * is not null, and LR is not yet written to the IGNodeList
+ if (!(L->getUserIGNode()) ) {
+ RegClass *const RC = // RegClass of first value in the LR
+ RegClassList[ L->getRegClass()->getID() ];
+ RC->addLRToIG(L); // add this LR to an IG
+ }
}
}
+
+ // init RegClassList
+ for ( unsigned rc=0; rc < NumOfRegClasses ; rc++)
+ RegClassList[rc]->createInterferenceGraph();
- // init RegClassList
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
- RegClassList[ rc ]->createInterferenceGraph();
-
- if( DEBUG_RA)
- cout << "LRLists Created!" << endl;
+ if (DEBUG_RA >= RA_DEBUG_LiveRanges) cerr << "LRLists Created!\n";
}
-
-
//----------------------------------------------------------------------------
// This method will add all interferences at for a given instruction.
// Interence occurs only if the LR of Def (Inst or Arg) is of the same reg
// class as that of live var. The live var passed to this function is the
// LVset AFTER the instruction
//----------------------------------------------------------------------------
-void PhyRegAlloc::addInterference(const Value *const Def,
- const LiveVarSet *const LVSet,
- const bool isCallInst) {
- LiveVarSet::const_iterator LIt = LVSet->begin();
+void PhyRegAlloc::addInterference(const Value *Def,
+ const ValueSet *LVSet,
+ bool isCallInst) {
+
+ ValueSet::const_iterator LIt = LVSet->begin();
// get the live range of instruction
//
// for each live var in live variable set
//
- for( ; LIt != LVSet->end(); ++LIt) {
+ for ( ; LIt != LVSet->end(); ++LIt) {
- if( DEBUG_RA > 1) {
- cout << "< Def="; printValue(Def);
- cout << ", Lvar="; printValue( *LIt); cout << "> ";
- }
+ if (DEBUG_RA >= RA_DEBUG_Verbose)
+ cerr << "< Def=" << RAV(Def) << ", Lvar=" << RAV(*LIt) << "> ";
// get the live range corresponding to live var
- //
- LiveRange *const LROfVar = LRI.getLiveRangeForValue(*LIt );
+ //
+ LiveRange *LROfVar = LRI.getLiveRangeForValue(*LIt);
// LROfVar can be null if it is a const since a const
// doesn't have a dominating def - see Assumptions above
//
- if( LROfVar) {
-
- 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) {
- // we will not have LRs for values not explicitly allocated in the
- // instruction stream (e.g., constants)
- cout << " warning: no live range for " ;
- printValue( *LIt); cout << endl; }
-
- }
-
+ if (LROfVar)
+ if (LROfDef != LROfVar) // do not set interf for same LR
+ if (RCOfDef == LROfVar->getRegClass()) // 2 reg classes are the same
+ RCOfDef->setInterference( LROfDef, LROfVar);
}
-
}
-
//----------------------------------------------------------------------------
// For a call instruction, this method sets the CallInterference flag in
// the LR of each variable live int the Live Variable Set live after the
//----------------------------------------------------------------------------
void PhyRegAlloc::setCallInterferences(const MachineInstr *MInst,
- const LiveVarSet *const LVSetAft ) {
-
- // Now find the LR of the return value of the call
- // We do this because, we look at the LV set *after* the instruction
- // to determine, which LRs must be saved across calls. The return value
- // 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)
- //
- LiveRange *RetValLR = NULL;
- const Value *RetVal = MRI.getCallInstRetVal( MInst );
-
- if( RetVal ) {
- RetValLR = LRI.getLiveRangeForValue( RetVal );
- assert( RetValLR && "No LR for RetValue of call");
- }
+ const ValueSet *LVSetAft) {
- if( DEBUG_RA)
- cout << "\n For call inst: " << *MInst;
+ if (DEBUG_RA >= RA_DEBUG_Interference)
+ cerr << "\n For call inst: " << *MInst;
- LiveVarSet::const_iterator LIt = LVSetAft->begin();
+ 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) {
- cout << "\n\tLR Aft Call: ";
- LR->printSet();
- }
-
-
// LR can be null if it is a const since a const
// doesn't have a dominating def - see Assumptions above
//
- if( LR && (LR != RetValLR) ) {
+ if (LR ) {
+ if (DEBUG_RA >= RA_DEBUG_Interference) {
+ cerr << "\n\tLR after Call: ";
+ printSet(*LR);
+ }
LR->setCallInterference();
- if( DEBUG_RA) {
- cout << "\n ++Added call interf for LR: " ;
- LR->printSet();
+ if (DEBUG_RA >= RA_DEBUG_Interference) {
+ cerr << "\n ++After adding call interference for LR: " ;
+ printSet(*LR);
}
}
}
+ // Now find the LR of the return value of the call
+ // We do this because, we look at the LV set *after* the instruction
+ // to determine, which LRs must be saved across calls. The return value
+ // 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)
+ //
+ 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 = 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) cout << "Creating interference graphs ..." << endl;
+ if (DEBUG_RA >= RA_DEBUG_Interference)
+ cerr << "Creating interference graphs ...\n";
unsigned BBLoopDepthCost;
- Method::const_iterator BBI = Meth->begin(); // random iterator for BBs
-
- for( ; BBI != Meth->end(); ++BBI) { // traverse BBs in random order
+ for (MachineFunction::iterator BBI = MF.begin(), BBE = MF.end();
+ BBI != BBE; ++BBI) {
+ const MachineBasicBlock &MBB = *BBI;
+ const BasicBlock *BB = MBB.getBasicBlock();
// find the 10^(loop_depth) of this BB
//
- BBLoopDepthCost = (unsigned) pow( 10.0, LoopDepthCalc.getLoopDepth(*BBI));
+ BBLoopDepthCost = (unsigned)pow(10.0, LoopDepthCalc->getLoopDepth(BB));
// get the iterator for machine instructions
//
- const MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
- MachineCodeForBasicBlock::const_iterator
- MInstIterator = MIVec.begin();
+ MachineBasicBlock::const_iterator MII = MBB.begin();
// iterate over all the machine instructions in BB
//
- for( ; MInstIterator != MIVec.end(); ++MInstIterator) {
-
- const MachineInstr * MInst = *MInstIterator;
+ for ( ; MII != MBB.end(); ++MII) {
+ const MachineInstr *MInst = *MII;
// get the LV set after the instruction
//
- const LiveVarSet *const LVSetAI =
- LVI->getLiveVarSetAfterMInst(MInst, *BBI);
-
- const bool isCallInst = TM.getInstrInfo().isCall(MInst->getOpCode());
+ const ValueSet &LVSetAI = LVI->getLiveVarSetAfterMInst(MInst, BB);
+ 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
// that span across calls (since they have to be saved/restored)
//
- setCallInterferences( MInst, LVSetAI);
+ setCallInterferences(MInst, &LVSetAI);
}
-
// iterate over all MI operands to find defs
//
- for( MachineInstr::val_const_op_iterator OpI(MInst);!OpI.done(); ++OpI) {
-
- if( OpI.isDef() ) {
- // create a new LR iff this operand is a def
- //
- addInterference(*OpI, LVSetAI, isCallInst );
- }
+ for (MachineInstr::const_val_op_iterator OpI = MInst->begin(),
+ OpE = MInst->end(); OpI != OpE; ++OpI) {
+ if (OpI.isDef()) // create a new LR iff this operand is a def
+ addInterference(*OpI, &LVSetAI, isCallInst);
// Calculate the spill cost of each live range
//
- LiveRange *LR = LRI.getLiveRangeForValue( *OpI );
- if( LR )
- LR->addSpillCost(BBLoopDepthCost);
+ LiveRange *LR = LRI.getLiveRangeForValue(*OpI);
+ if (LR) LR->addSpillCost(BBLoopDepthCost);
}
// if there are multiple defs in this instruction e.g. in SETX
//
- if( (TM.getInstrInfo()).isPseudoInstr( MInst->getOpCode()) )
+ if (TM.getInstrInfo().isPseudoInstr(MInst->getOpCode()))
addInterf4PseudoInstr(MInst);
// instr (currently, only calls have this).
//
unsigned NumOfImpRefs = MInst->getNumImplicitRefs();
- if( NumOfImpRefs > 0 ) {
- for(unsigned z=0; z < NumOfImpRefs; z++)
- if( MInst->implicitRefIsDefined(z) )
- addInterference( MInst->getImplicitRef(z), LVSetAI, isCallInst );
+ if ( NumOfImpRefs > 0 ) {
+ for (unsigned z=0; z < NumOfImpRefs; z++)
+ if (MInst->implicitRefIsDefined(z) )
+ addInterference( MInst->getImplicitRef(z), &LVSetAI, isCallInst );
}
} // for all machine instructions in BB
-
- } // for all BBs in method
+ } // for all BBs in function
- // add interferences for method arguments. Since there are no explict
- // defs in method for args, we have to add them manually
+ // add interferences for function arguments. Since there are no explict
+ // defs in the function for args, we have to add them manually
//
addInterferencesForArgs();
- if( DEBUG_RA)
- cout << "Interference graphs calculted!" << endl;
-
+ if (DEBUG_RA >= RA_DEBUG_Interference)
+ cerr << "Interference graphs calculated!\n";
}
// iterate over MI operands to find defs
//
- for( MachineInstr::val_const_op_iterator It1(MInst);!It1.done(); ++It1) {
-
- const LiveRange *const LROfOp1 = LRI.getLiveRangeForValue( *It1 );
-
- if( !LROfOp1 && It1.isDef() )
- assert( 0 && "No LR for Def in PSEUDO insruction");
-
- MachineInstr::val_const_op_iterator It2 = It1;
- ++It2;
-
- for( ; !It2.done(); ++It2) {
-
- const LiveRange *const LROfOp2 = LRI.getLiveRangeForValue( *It2 );
-
- if( LROfOp2) {
-
- RegClass *const RCOfOp1 = LROfOp1->getRegClass();
- RegClass *const RCOfOp2 = LROfOp2->getRegClass();
+ for (MachineInstr::const_val_op_iterator It1 = MInst->begin(),
+ ItE = MInst->end(); It1 != ItE; ++It1) {
+ const LiveRange *LROfOp1 = LRI.getLiveRangeForValue(*It1);
+ assert((LROfOp1 || !It1.isDef()) && "No LR for Def in PSEUDO insruction");
+
+ MachineInstr::const_val_op_iterator It2 = It1;
+ 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;
}
-
} // if Op2 has a LR
-
} // for all other defs in machine instr
-
} // for all operands in an instruction
- if( !setInterf && (MInst->getNumOperands() > 2) ) {
+ if (!setInterf && MInst->getNumOperands() > 2) {
cerr << "\nInterf not set for any operand in pseudo instr:\n";
cerr << *MInst;
assert(0 && "Interf not set for pseudo instr with > 2 operands" );
-
}
-
}
//----------------------------------------------------------------------------
-// This method will add interferences for incoming arguments to a method.
+// This method will add interferences for incoming arguments to a function.
//----------------------------------------------------------------------------
-void PhyRegAlloc::addInterferencesForArgs()
-{
- // get the InSet of root BB
- const LiveVarSet *const InSet = LVI->getInSetOfBB( Meth->front() );
- // get the argument list
- const Method::ArgumentListType& ArgList = Meth->getArgumentList();
+void PhyRegAlloc::addInterferencesForArgs() {
+ // get the InSet of root BB
+ const ValueSet &InSet = LVI->getInSetOfBB(&Fn->front());
- // get an iterator to arg list
- Method::ArgumentListType::const_iterator ArgIt = ArgList.begin();
-
-
- for( ; ArgIt != ArgList.end() ; ++ArgIt) { // for each argument
- addInterference( *ArgIt, InSet, false ); // add interferences between
- // args and LVars at start
- if( DEBUG_RA > 1) {
- cout << " - %% adding interference for argument ";
- printValue( (const Value *) *ArgIt); cout << endl;
- }
+ for (Function::const_aiterator AI = Fn->abegin(); AI != Fn->aend(); ++AI) {
+ // add interferences between args and LVars at start
+ addInterference(AI, &InSet, false);
+
+ if (DEBUG_RA >= RA_DEBUG_Interference)
+ cerr << " - %% adding interference for argument " << RAV(AI) << "\n";
}
}
-
-
//----------------------------------------------------------------------------
// This method is called after register allocation is complete to set the
// allocated reisters in the machine code. This code will add register numbers
// additional instructions produced by the register allocator to the
// instruction stream.
//----------------------------------------------------------------------------
-void PhyRegAlloc::updateMachineCode()
+
+//-----------------------------
+// Utility functions used below
+//-----------------------------
+inline void
+InsertBefore(MachineInstr* newMI,
+ MachineBasicBlock& MBB,
+ MachineBasicBlock::iterator& MII)
{
+ MII = MBB.insert(MII, newMI);
+ ++MII;
+}
- Method::const_iterator BBI = Meth->begin(); // random iterator for BBs
+inline void
+InsertAfter(MachineInstr* newMI,
+ MachineBasicBlock& MBB,
+ MachineBasicBlock::iterator& MII)
+{
+ ++MII; // insert before the next instruction
+ MII = MBB.insert(MII, newMI);
+}
- for( ; BBI != Meth->end(); ++BBI) { // traverse BBs in random order
+inline void
+SubstituteInPlace(MachineInstr* newMI,
+ MachineBasicBlock& MBB,
+ MachineBasicBlock::iterator MII)
+{
+ *MII = newMI;
+}
+
+inline void
+PrependInstructions(vector<MachineInstr *> &IBef,
+ MachineBasicBlock& MBB,
+ MachineBasicBlock::iterator& MII,
+ const std::string& msg)
+{
+ if (!IBef.empty())
+ {
+ MachineInstr* OrigMI = *MII;
+ std::vector<MachineInstr *>::iterator AdIt;
+ for (AdIt = IBef.begin(); AdIt != IBef.end() ; ++AdIt)
+ {
+ if (DEBUG_RA) {
+ if (OrigMI) cerr << "For MInst:\n " << *OrigMI;
+ cerr << msg << "PREPENDed instr:\n " << **AdIt << "\n";
+ }
+ InsertBefore(*AdIt, MBB, MII);
+ }
+ }
+}
+
+inline void
+AppendInstructions(std::vector<MachineInstr *> &IAft,
+ MachineBasicBlock& MBB,
+ MachineBasicBlock::iterator& MII,
+ const std::string& msg)
+{
+ if (!IAft.empty())
+ {
+ MachineInstr* OrigMI = *MII;
+ std::vector<MachineInstr *>::iterator AdIt;
+ for ( AdIt = IAft.begin(); AdIt != IAft.end() ; ++AdIt )
+ {
+ if (DEBUG_RA) {
+ if (OrigMI) cerr << "For MInst:\n " << *OrigMI;
+ cerr << msg << "APPENDed instr:\n " << **AdIt << "\n";
+ }
+ InsertAfter(*AdIt, MBB, MII);
+ }
+ }
+}
- // get the iterator for machine instructions
- //
- MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
- MachineCodeForBasicBlock::iterator MInstIterator = MIVec.begin();
+
+void PhyRegAlloc::updateMachineCode() {
+ // Insert any instructions needed at method entry
+ MachineBasicBlock::iterator MII = MF.front().begin();
+ PrependInstructions(AddedInstrAtEntry.InstrnsBefore, MF.front(), 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 (MachineFunction::iterator BBI = MF.begin(), BBE = MF.end();
+ BBI != BBE; ++BBI) {
// iterate over all the machine instructions in BB
- //
- for( ; MInstIterator != MIVec.end(); ++MInstIterator) {
-
- MachineInstr *MInst = *MInstIterator;
-
+ MachineBasicBlock &MBB = *BBI;
+ for (MachineBasicBlock::iterator MII = MBB.begin();
+ MII != MBB.end(); ++MII) {
+
+ MachineInstr *MInst = *MII;
unsigned Opcode = MInst->getOpCode();
// do not process Phis
- if( (TM.getInstrInfo()).isPhi( Opcode ) )
+ if (TM.getInstrInfo().isDummyPhiInstr(Opcode))
continue;
+ // Reset tmp stack positions so they can be reused for each machine instr.
+ MF.popAllTempValues(TM);
+
// Now insert speical instructions (if necessary) for call/return
// instructions.
//
- if( (TM.getInstrInfo()).isCall( Opcode) ||
- (TM.getInstrInfo()).isReturn( Opcode) ) {
-
- AddedInstrns *AI = AddedInstrMap[ MInst];
- if ( !AI ) {
- AI = new AddedInstrns();
- AddedInstrMap[ MInst ] = AI;
- }
-
- // 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 );
-
- else if ( (TM.getInstrInfo()).isReturn(Opcode) )
- MRI.colorRetValue( MInst, LRI, AI );
+ if (TM.getInstrInfo().isCall(Opcode) ||
+ TM.getInstrInfo().isReturn(Opcode)) {
+ AddedInstrns &AI = AddedInstrMap[MInst];
+ if (TM.getInstrInfo().isCall(Opcode))
+ MRI.colorCallArgs(MInst, LRI, &AI, *this, MBB.getBasicBlock());
+ 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 );
-
- */
-
-
- // 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)
- cout << "Warning: NULL Value found for operand" << endl;
- 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) {
- cout << "*NO LR for operand : " << Op ;
- cout << " [reg:" << Op.getAllocatedRegNum() << "]";
- cout << " in inst:\t" << *MInst << endl;
+ // 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.getType() == MachineOperand::MO_VirtualRegister ||
+ Op.getType() == 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, MBB.getBasicBlock(), OpNum);
}
-
- // 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
-
+ } // 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
// closest as possible to an instruction (see above insertCode4Spill...)
//
+ // First, if the instruction in the delay slot of a branch needs
+ // instructions inserted, move it out of the delay slot and before the
+ // branch because putting code before or after it would be VERY BAD!
+ //
+ unsigned bumpIteratorBy = 0;
+ if (MII != MBB.begin())
+ if (unsigned predDelaySlots =
+ TM.getInstrInfo().getNumDelaySlots((*(MII-1))->getOpCode()))
+ {
+ assert(predDelaySlots==1 && "Not handling multiple delay slots!");
+ if (TM.getInstrInfo().isBranch((*(MII-1))->getOpCode())
+ && (AddedInstrMap.count(MInst) ||
+ AddedInstrMap[MInst].InstrnsAfter.size() > 0))
+ {
+ // Current instruction is in the delay slot of a branch and it
+ // needs spill code inserted before or after it.
+ // Move it before the preceding branch.
+ InsertBefore(MInst, MBB, --MII);
+ MachineInstr* nopI =
+ new MachineInstr(TM.getInstrInfo().getNOPOpCode());
+ SubstituteInPlace(nopI, MBB, MII+1); // replace orig with NOP
+ --MII; // point to MInst in new location
+ bumpIteratorBy = 2; // later skip the branch and the NOP!
+ }
+ }
+
// If there are instructions to be added, *before* this machine
// instruction, add them now.
//
- if( AddedInstrMap[ MInst ] ) {
-
- deque<MachineInstr *> &IBef = (AddedInstrMap[MInst])->InstrnsBefore;
-
- if( ! IBef.empty() ) {
-
- deque<MachineInstr *>::iterator AdIt;
-
- for( AdIt = IBef.begin(); AdIt != IBef.end() ; ++AdIt ) {
-
- if( DEBUG_RA) {
- cerr << "For inst " << *MInst;
- cerr << " PREPENDed instr: " << **AdIt << endl;
- }
-
- MInstIterator = MIVec.insert( MInstIterator, *AdIt );
- ++MInstIterator;
- }
-
- }
-
+ if (AddedInstrMap.count(MInst)) {
+ PrependInstructions(AddedInstrMap[MInst].InstrnsBefore, MBB, MII,"");
}
-
+
// If there are instructions to be added *after* this machine
// instruction, add them now
//
- if( AddedInstrMap[ MInst ] &&
- ! (AddedInstrMap[ MInst ]->InstrnsAfter).empty() ) {
+ if (!AddedInstrMap[MInst].InstrnsAfter.empty()) {
// if there are delay slots for this instruction, the instructions
// added after it must really go after the delayed instruction(s)
// So, we move the InstrAfter of the current instruction to the
// corresponding delayed instruction
-
- unsigned delay;
- if((delay=TM.getInstrInfo().getNumDelaySlots(MInst->getOpCode())) >0){
- move2DelayedInstr(MInst, *(MInstIterator+delay) );
-
- if(DEBUG_RA) cout<< "\nMoved an added instr after the delay slot";
+ if (unsigned delay =
+ TM.getInstrInfo().getNumDelaySlots(MInst->getOpCode())) {
+
+ // Delayed instructions are typically branches or calls. Let's make
+ // sure this is not a branch, otherwise "insert-after" is meaningless,
+ // and should never happen for any reason (spill code, register
+ // restores, etc.).
+ assert(! TM.getInstrInfo().isBranch(MInst->getOpCode()) &&
+ ! TM.getInstrInfo().isReturn(MInst->getOpCode()) &&
+ "INTERNAL ERROR: Register allocator should not be inserting "
+ "any code after a branch or return!");
+
+ move2DelayedInstr(MInst, *(MII+delay) );
}
-
else {
-
-
// Here we can add the "instructions after" to the current
// instruction since there are no delay slots for this instruction
-
- deque<MachineInstr *> &IAft = (AddedInstrMap[MInst])->InstrnsAfter;
-
- if( ! IAft.empty() ) {
-
- deque<MachineInstr *>::iterator AdIt;
-
- ++MInstIterator; // advance to the next instruction
-
- for( AdIt = IAft.begin(); AdIt != IAft.end() ; ++AdIt ) {
-
- if(DEBUG_RA) {
- cerr << "For inst " << *MInst;
- cerr << " APPENDed instr: " << **AdIt << endl;
- }
-
- MInstIterator = MIVec.insert( MInstIterator, *AdIt );
- ++MInstIterator;
- }
-
- // MInsterator already points to the next instr. Since the
- // for loop also increments it, decrement it to point to the
- // instruction added last
- --MInstIterator;
-
- }
-
+ AppendInstructions(AddedInstrMap[MInst].InstrnsAfter, MBB, MII,"");
} // if not delay
-
}
-
+
+ // If we mucked with the instruction order above, adjust the loop iterator
+ if (bumpIteratorBy)
+ MII = MII + bumpIteratorBy;
+
} // for each machine instruction
}
}
const BasicBlock *BB,
const unsigned OpNum) {
- assert(! TM.getInstrInfo().isCall(MInst->getOpCode()) &&
- (! TM.getInstrInfo().isReturn(MInst->getOpCode())) &&
- "Arg of a call/ret must be handled elsewhere");
+ assert((! TM.getInstrInfo().isCall(MInst->getOpCode()) || OpNum == 0) &&
+ "Outgoing arg of a call must be handled elsewhere (func arg ok)");
+ assert(! TM.getInstrInfo().isReturn(MInst->getOpCode()) &&
+ "Return value of a ret must be handled elsewhere");
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();
- const LiveVarSet *LVSetBef = LVI->getLiveVarSetBeforeMInst(MInst, BB);
-
+ const ValueSet &LVSetBef = LVI->getLiveVarSetBeforeMInst(MInst, BB);
- int TmpOff =
- mcInfo.pushTempValue(TM, MRI.getSpilledRegSize(RegType) );
+ MF.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
- AddedInstrns *AI = AddedInstrMap[ MInst ];
- if ( !AI ) {
- AI = new AddedInstrns();
- AddedInstrMap[ MInst ] = AI;
- }
-
-
- if( !isDef ) {
-
+ // 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];
+
+ // 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 = getUsableUniRegAtMI(scratchRegType, &LVSetBef,
+ MInst, MIBef, MIAft);
+ assert(scratchReg != MRI.getInvalidRegNum());
+ MInst->insertUsedReg(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);
+ // actual loading instruction(s)
+ MRI.cpMem2RegMI(AdIMid, MRI.getFramePointer(), SpillOff, TmpRegU, RegType,
+ scratchReg);
- }
- else { // if this is a Def
-
+ // 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: "; LR->printSet();
- 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:\n " << *MInst;
+ cerr << "SPILLED LR# " << LR->getUserIGNode()->getIndex();
+ cerr << "; 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 LiveVarSet *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 = 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) );
+
+ int TmpOff = MF.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 = 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->insertUsedReg(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;
}
//----------------------------------------------------------------------------
int PhyRegAlloc::getUnusedUniRegAtMI(RegClass *RC,
const MachineInstr *MInst,
- const LiveVarSet *LVSetBef) {
+ const ValueSet *LVSetBef) {
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;
- LiveVarSet::const_iterator LIt = LVSetBef->begin();
+ 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;
}
-
-
-
//----------------------------------------------------------------------------
// This method modifies the IsColorUsedArr of the register class passed to it.
// It sets the bits corresponding to the registers used by this machine
// 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 vector<bool> ®sUsed = MInst->getRegsUsed();
+ for (unsigned i = 0, e = regsUsed.size(); i != e; ++i)
+ if (regsUsed[i]) {
+ unsigned classId = 0;
+ int classRegNum = MRI.getClassRegNum(i, 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 (MInst->getOperandType(OpNum) == MachineOperand::MO_VirtualRegister ||
+ MInst->getOperandType(OpNum) == 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 )
- if( 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).
// corresponding delayed instruction using the following method.
//----------------------------------------------------------------------------
-void PhyRegAlloc:: move2DelayedInstr(const MachineInstr *OrigMI,
- const MachineInstr *DelayedMI) {
-
+void PhyRegAlloc::move2DelayedInstr(const MachineInstr *OrigMI,
+ const MachineInstr *DelayedMI) {
// "added after" instructions of the original instr
- deque<MachineInstr *> &OrigAft = (AddedInstrMap[OrigMI])->InstrnsAfter;
+ std::vector<MachineInstr *> &OrigAft = AddedInstrMap[OrigMI].InstrnsAfter;
// "added instructions" of the delayed instr
- AddedInstrns *DelayAdI = AddedInstrMap[DelayedMI];
-
- if(! DelayAdI ) { // create a new "added after" if necessary
- DelayAdI = new AddedInstrns();
- AddedInstrMap[DelayedMI] = DelayAdI;
- }
+ AddedInstrns &DelayAdI = AddedInstrMap[DelayedMI];
// "added after" instructions of the delayed instr
- 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
// instructions
-
- deque<MachineInstr *>::iterator OrigAdIt;
-
- for( OrigAdIt = OrigAft.begin(); OrigAdIt != OrigAft.end() ; ++OrigAdIt ) {
- DelayedAft.push_back( *OrigAdIt );
- }
+ DelayedAft.insert(DelayedAft.end(), OrigAft.begin(), OrigAft.end());
// empty the "added after instructions" of the original instruction
OrigAft.clear();
-
}
//----------------------------------------------------------------------------
void PhyRegAlloc::printMachineCode()
{
- cout << endl << ";************** Method ";
- cout << Meth->getName() << " *****************" << endl;
-
- Method::const_iterator BBI = Meth->begin(); // random iterator for BBs
-
- for( ; BBI != Meth->end(); ++BBI) { // traverse BBs in random order
+ cerr << "\n;************** Function " << Fn->getName()
+ << " *****************\n";
- cout << endl ; printLabel( *BBI); cout << ": ";
+ for (MachineFunction::iterator BBI = MF.begin(), BBE = MF.end();
+ BBI != BBE; ++BBI) {
+ cerr << "\n"; printLabel(BBI->getBasicBlock()); cerr << ": ";
// get the iterator for machine instructions
- MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
- MachineCodeForBasicBlock::iterator MInstIterator = MIVec.begin();
+ MachineBasicBlock& MBB = *BBI;
+ MachineBasicBlock::iterator MII = MBB.begin();
// iterate over all the machine instructions in BB
- for( ; MInstIterator != MIVec.end(); ++MInstIterator) {
-
- MachineInstr *const MInst = *MInstIterator;
-
-
- cout << endl << "\t";
- cout << TargetInstrDescriptors[MInst->getOpCode()].opCodeString;
-
-
- //for(MachineInstr::val_const_op_iterator OpI(MInst);!OpI.done();++OpI) {
+ for ( ; MII != MBB.end(); ++MII) {
+ MachineInstr *const MInst = *MII;
- for(unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum) {
+ cerr << "\n\t";
+ cerr << TargetInstrDescriptors[MInst->getOpCode()].opCodeString;
+ for (unsigned OpNum=0; OpNum < MInst->getNumOperands(); ++OpNum) {
MachineOperand& Op = MInst->getOperand(OpNum);
- if( Op.getOperandType() == MachineOperand::MO_VirtualRegister ||
- Op.getOperandType() == MachineOperand::MO_CCRegister /*||
- Op.getOperandType() == MachineOperand::MO_PCRelativeDisp*/ ) {
+ if (Op.getType() == MachineOperand::MO_VirtualRegister ||
+ Op.getType() == MachineOperand::MO_CCRegister /*||
+ Op.getType() == MachineOperand::MO_PCRelativeDisp*/ ) {
const Value *const Val = Op.getVRegValue () ;
// ****this code is temporary till NULL Values are fixed
- if( ! Val ) {
- cout << "\t<*NULL*>";
+ if (! Val ) {
+ cerr << "\t<*NULL*>";
continue;
}
// if a label or a constant
- if( (Val->getValueType() == Value::BasicBlockVal) ) {
-
- cout << "\t"; printLabel( Op.getVRegValue () );
- }
- else {
+ if (isa<BasicBlock>(Val)) {
+ cerr << "\t"; printLabel( Op.getVRegValue () );
+ } else {
// else it must be a register value
const int RegNum = Op.getAllocatedRegNum();
- cout << "\t" << "%" << MRI.getUnifiedRegName( RegNum );
+ cerr << "\t" << "%" << MRI.getUnifiedRegName( RegNum );
if (Val->hasName() )
- cout << "(" << Val->getName() << ")";
+ cerr << "(" << Val->getName() << ")";
else
- cout << "(" << Val << ")";
+ cerr << "(" << Val << ")";
- if( Op.opIsDef() )
- cout << "*";
+ if (Op.opIsDef() )
+ cerr << "*";
const LiveRange *LROfVal = LRI.getLiveRangeForValue(Val);
- if( LROfVal )
- if( LROfVal->hasSpillOffset() )
- cout << "$";
+ if (LROfVal )
+ if (LROfVal->hasSpillOffset() )
+ cerr << "$";
}
}
- else if(Op.getOperandType() == MachineOperand::MO_MachineRegister) {
- cout << "\t" << "%" << MRI.getUnifiedRegName(Op.getMachineRegNum());
+ else if (Op.getType() == MachineOperand::MO_MachineRegister) {
+ cerr << "\t" << "%" << MRI.getUnifiedRegName(Op.getMachineRegNum());
}
else
- cout << "\t" << Op; // use dump field
+ cerr << "\t" << Op; // use dump field
}
unsigned NumOfImpRefs = MInst->getNumImplicitRefs();
- if( NumOfImpRefs > 0 ) {
-
- cout << "\tImplicit:";
+ if (NumOfImpRefs > 0) {
+ cerr << "\tImplicit:";
- for(unsigned z=0; z < NumOfImpRefs; z++) {
- printValue( MInst->getImplicitRef(z) );
- cout << "\t";
- }
-
+ for (unsigned z=0; z < NumOfImpRefs; z++)
+ cerr << RAV(MInst->getImplicitRef(z)) << "\t";
}
} // for all machine instructions
-
- cout << endl;
+ cerr << "\n";
} // for all BBs
- cout << endl;
-}
-
-
-#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 ];
- if ( !AI ) {
- AI = new AddedInstrns();
- AddedInstrMap[ CRMI ] = AI;
- }
-
- // 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( 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" );
-
- }
-
+ cerr << "\n";
}
-#endif
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
void PhyRegAlloc::colorIncomingArgs()
{
- const BasicBlock *const FirstBB = Meth->front();
- const MachineInstr *FirstMI = *((FirstBB->getMachineInstrVec()).begin());
- assert( FirstMI && "No machine instruction in entry BB");
-
- AddedInstrns *AI = AddedInstrMap[ FirstMI ];
- if ( !AI ) {
- AI = new AddedInstrns();
- AddedInstrMap[ FirstMI ] = AI;
- }
-
- MRI.colorMethodArgs(Meth, LRI, AI );
+ MRI.colorMethodArgs(Fn, LRI, &AddedInstrAtEntry);
}
//----------------------------------------------------------------------------
// Used to generate a label for a basic block
//----------------------------------------------------------------------------
-void PhyRegAlloc::printLabel(const Value *const Val)
-{
- if( Val->hasName() )
- cout << Val->getName();
+void PhyRegAlloc::printLabel(const Value *Val) {
+ if (Val->hasName())
+ cerr << Val->getName();
else
- cout << "Label" << Val;
+ cerr << "Label" << Val;
}
void PhyRegAlloc::markUnusableSugColors()
{
- if(DEBUG_RA ) cout << "\nmarking unusable suggested colors ..." << endl;
-
// hash map iterator
LiveRangeMapType::const_iterator HMI = (LRI.getLiveRangeMap())->begin();
LiveRangeMapType::const_iterator HMIEnd = (LRI.getLiveRangeMap())->end();
- for( ; HMI != HMIEnd ; ++HMI ) {
-
- if( (*HMI).first ) {
-
- LiveRange *L = (*HMI).second; // get the LiveRange
-
- if(L) {
- if( L->hasSuggestedColor() ) {
-
- int RCID = (L->getRegClass())->getID();
- if( MRI.isRegVolatile( RCID, L->getSuggestedColor()) &&
+ for (; HMI != HMIEnd ; ++HMI ) {
+ if (HMI->first) {
+ LiveRange *L = HMI->second; // get the LiveRange
+ if (L) {
+ if (L->hasSuggestedColor()) {
+ int RCID = L->getRegClass()->getID();
+ if (MRI.isRegVolatile( RCID, L->getSuggestedColor()) &&
L->isCallInterference() )
L->setSuggestedColorUsable( false );
else
// this method allocate a new spill position on the stack.
//----------------------------------------------------------------------------
-void PhyRegAlloc::allocateStackSpace4SpilledLRs()
-{
- if(DEBUG_RA ) cout << "\nsetting LR stack offsets ..." << endl;
-
- // hash map iterator
- LiveRangeMapType::const_iterator HMI = (LRI.getLiveRangeMap())->begin();
- LiveRangeMapType::const_iterator HMIEnd = (LRI.getLiveRangeMap())->end();
-
- for( ; HMI != HMIEnd ; ++HMI ) {
- if( (*HMI).first ) {
- LiveRange *L = (*HMI).second; // get the LiveRange
- if(L)
- if( ! L->hasColor() )
-
- // NOTE: ** allocating the size of long Type **
- L->setSpillOffFromFP(mcInfo.allocateSpilledValue(TM,
- Type::LongTy));
-
+void PhyRegAlloc::allocateStackSpace4SpilledLRs() {
+ if (DEBUG_RA) cerr << "\nSetting LR stack offsets for spills...\n";
+
+ LiveRangeMapType::const_iterator HMI = LRI.getLiveRangeMap()->begin();
+ LiveRangeMapType::const_iterator HMIEnd = LRI.getLiveRangeMap()->end();
+
+ 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 **
+ int stackOffset = MF.allocateSpilledValue(TM, Type::LongTy);
+ L->setSpillOffFromFP(stackOffset);
+ if (DEBUG_RA)
+ cerr << " LR# " << L->getUserIGNode()->getIndex()
+ << ": stack-offset = " << stackOffset << "\n";
}
- } // for all LR's in hash map
+ }
+ } // for all LR's in hash map
}
//
LRI.constructLiveRanges(); // create LR info
- if( DEBUG_RA )
+ if (DEBUG_RA >= RA_DEBUG_LiveRanges)
LRI.printLiveRanges();
createIGNodeListsAndIGs(); // create IGNode list and IGs
buildInterferenceGraphs(); // build IGs in all reg classes
- if( DEBUG_RA ) {
+ if (DEBUG_RA >= RA_DEBUG_LiveRanges) {
// 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 >= RA_DEBUG_LiveRanges) {
// 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();
}
markUnusableSugColors();
// color all register classes using the graph coloring algo
- for( unsigned int rc=0; rc < NumOfRegClasses ; rc++)
- RegClassList[ rc ]->colorAllRegs();
+ for (unsigned rc=0; rc < NumOfRegClasses ; rc++)
+ RegClassList[rc]->colorAllRegs();
// Atter grpah coloring, if some LRs did not receive a color (i.e, spilled)
// a poistion for such spilled LRs
//
allocateStackSpace4SpilledLRs();
- mcInfo.popAllTempValues(TM); // TODO **Check
+ MF.popAllTempValues(TM); // TODO **Check
// color incoming args - if the correct color was not received
// insert code to copy to the correct register
//
colorIncomingArgs();
-
// Now update the machine code with register names and add any
// additional code inserted by the register allocator to the instruction
// stream
//
updateMachineCode();
-
if (DEBUG_RA) {
- MachineCodeForMethod::get(Meth).dump();
- printMachineCode(); // only for DEBUGGING
+ cerr << "\n**** Machine Code After Register Allocation:\n\n";
+ MF.dump();
}
-
}
projects / oota-llvm.git / blobdiff