mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 18:29:46 +00:00
Renamed op_const_iterator -> const_op_iterator Renamed PointerType::getValueType() -> PointerType::getElementType() git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1408 91177308-0d34-0410-b5e6-96231b3b80d8
380 lines
11 KiB
C++
380 lines
11 KiB
C++
#include "llvm/CodeGen/LiveRangeInfo.h"
|
|
|
|
LiveRangeInfo::LiveRangeInfo(const Method *const M,
|
|
const TargetMachine& tm,
|
|
vector<RegClass *> &RCL)
|
|
: Meth(M), LiveRangeMap(),
|
|
TM(tm), RegClassList(RCL),
|
|
MRI( tm.getRegInfo()),
|
|
CallRetInstrList()
|
|
{ }
|
|
|
|
|
|
// union two live ranges into one. The 2nd LR is deleted. Used for coalescing.
|
|
// Note: the caller must make sure that L1 and L2 are distinct and both
|
|
// LRs don't have suggested colors
|
|
|
|
void LiveRangeInfo::unionAndUpdateLRs(LiveRange *const L1, LiveRange *L2)
|
|
{
|
|
assert( L1 != L2);
|
|
L1->setUnion( L2 ); // add elements of L2 to L1
|
|
ValueSet::iterator L2It;
|
|
|
|
for( L2It = L2->begin() ; L2It != L2->end(); ++L2It) {
|
|
|
|
//assert(( L1->getTypeID() == L2->getTypeID()) && "Merge:Different types");
|
|
|
|
L1->add( *L2It ); // add the var in L2 to L1
|
|
LiveRangeMap[ *L2It ] = L1; // now the elements in L2 should map to L1
|
|
}
|
|
|
|
|
|
// Now if LROfDef(L1) has a suggested color, it will remain.
|
|
// But, if LROfUse(L2) has a suggested color, the new range
|
|
// must have the same color.
|
|
|
|
if(L2->hasSuggestedColor())
|
|
L1->setSuggestedColor( L2->getSuggestedColor() );
|
|
|
|
|
|
if( L2->isCallInterference() )
|
|
L1->setCallInterference();
|
|
|
|
|
|
delete ( L2 ); // delete L2 as it is no longer needed
|
|
}
|
|
|
|
|
|
|
|
|
|
void LiveRangeInfo::constructLiveRanges()
|
|
{
|
|
|
|
if( DEBUG_RA)
|
|
cout << "Consturcting Live Ranges ..." << endl;
|
|
|
|
// first find the live ranges for all incoming args of the method since
|
|
// those LRs start from the start of the method
|
|
|
|
// get the argument list
|
|
const Method::ArgumentListType& ArgList = Meth->getArgumentList();
|
|
// get an iterator to arg list
|
|
Method::ArgumentListType::const_iterator ArgIt = ArgList.begin();
|
|
|
|
|
|
for( ; ArgIt != ArgList.end() ; ++ArgIt) { // for each argument
|
|
|
|
LiveRange * ArgRange = new LiveRange(); // creates a new LR and
|
|
const Value *const Val = (const Value *) *ArgIt;
|
|
|
|
assert( Val);
|
|
|
|
ArgRange->add( Val ); // add the arg (def) to it
|
|
LiveRangeMap[ Val ] = ArgRange;
|
|
|
|
// create a temp machine op to find the register class of value
|
|
//const MachineOperand Op(MachineOperand::MO_VirtualRegister);
|
|
|
|
unsigned rcid = MRI.getRegClassIDOfValue( Val );
|
|
ArgRange->setRegClass(RegClassList[ rcid ] );
|
|
|
|
|
|
if( DEBUG_RA > 1) {
|
|
cout << " adding LiveRange for argument ";
|
|
printValue( (const Value *) *ArgIt); cout << endl;
|
|
}
|
|
}
|
|
|
|
// Now suggest hardware registers for these method args
|
|
MRI.suggestRegs4MethodArgs(Meth, *this);
|
|
|
|
|
|
|
|
// Now find speical LLVM instructions (CALL, RET) and LRs in machine
|
|
// instructions.
|
|
|
|
|
|
Method::const_iterator BBI = Meth->begin(); // random iterator for BBs
|
|
|
|
for( ; BBI != Meth->end(); ++BBI) { // go thru BBs in random order
|
|
|
|
// Now find all LRs for machine the instructions. A new LR will be created
|
|
// only for defs in the machine instr since, we assume that all Values are
|
|
// defined before they are used. However, there can be multiple defs for
|
|
// the same Value in machine instructions.
|
|
|
|
// get the iterator for machine instructions
|
|
const MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
|
|
MachineCodeForBasicBlock::const_iterator
|
|
MInstIterator = MIVec.begin();
|
|
|
|
// iterate over all the machine instructions in BB
|
|
for( ; MInstIterator != MIVec.end(); MInstIterator++) {
|
|
|
|
const MachineInstr * MInst = *MInstIterator;
|
|
|
|
// Now if the machine instruction is a call/return instruction,
|
|
// add it to CallRetInstrList for processing its implicit operands
|
|
|
|
if( (TM.getInstrInfo()).isReturn( MInst->getOpCode()) ||
|
|
(TM.getInstrInfo()).isCall( MInst->getOpCode()) )
|
|
CallRetInstrList.push_back( MInst );
|
|
|
|
|
|
// iterate over MI operands to find defs
|
|
for( MachineInstr::val_const_op_iterator OpI(MInst);!OpI.done(); ++OpI) {
|
|
|
|
if( DEBUG_RA) {
|
|
MachineOperand::MachineOperandType OpTyp =
|
|
OpI.getMachineOperand().getOperandType();
|
|
|
|
if ( OpTyp == MachineOperand::MO_CCRegister) {
|
|
cout << "\n**CC reg found. Is Def=" << OpI.isDef() << " Val:";
|
|
printValue( OpI.getMachineOperand().getVRegValue() );
|
|
cout << endl;
|
|
}
|
|
}
|
|
|
|
// create a new LR iff this operand is a def
|
|
if( OpI.isDef() ) {
|
|
|
|
const Value *const Def = *OpI;
|
|
|
|
|
|
// Only instruction values are accepted for live ranges here
|
|
|
|
if( Def->getValueType() != Value::InstructionVal ) {
|
|
cout << "\n**%%Error: Def is not an instruction val. Def=";
|
|
printValue( Def ); cout << endl;
|
|
continue;
|
|
}
|
|
|
|
|
|
LiveRange *DefRange = LiveRangeMap[Def];
|
|
|
|
// see LR already there (because of multiple defs)
|
|
|
|
if( !DefRange) { // if it is not in LiveRangeMap
|
|
|
|
DefRange = new LiveRange(); // creates a new live range and
|
|
DefRange->add( Def ); // add the instruction (def) to it
|
|
LiveRangeMap[ Def ] = DefRange; // update the map
|
|
|
|
if( DEBUG_RA > 1) {
|
|
cout << " creating a LR for def: ";
|
|
printValue(Def); cout << endl;
|
|
}
|
|
|
|
// set the register class of the new live range
|
|
//assert( RegClassList.size() );
|
|
MachineOperand::MachineOperandType OpTy =
|
|
OpI.getMachineOperand().getOperandType();
|
|
|
|
bool isCC = ( OpTy == MachineOperand::MO_CCRegister);
|
|
unsigned rcid = MRI.getRegClassIDOfValue(
|
|
OpI.getMachineOperand().getVRegValue(), isCC );
|
|
|
|
|
|
if(isCC && DEBUG_RA) {
|
|
cout << "\a**created a LR for a CC reg:";
|
|
printValue( OpI.getMachineOperand().getVRegValue() );
|
|
}
|
|
|
|
DefRange->setRegClass( RegClassList[ rcid ] );
|
|
|
|
}
|
|
else {
|
|
DefRange->add( Def ); // add the opearand to def range
|
|
// update the map - Operand points
|
|
// to the merged set
|
|
LiveRangeMap[ Def ] = DefRange;
|
|
|
|
if( DEBUG_RA > 1) {
|
|
cout << " added to an existing LR for def: ";
|
|
printValue( Def ); cout << endl;
|
|
}
|
|
}
|
|
|
|
} // if isDef()
|
|
|
|
} // for all opereands in machine instructions
|
|
|
|
} // for all machine instructions in the BB
|
|
|
|
} // for all BBs in method
|
|
|
|
|
|
// Now we have to suggest clors for call and return arg live ranges.
|
|
// Also, if there are implicit defs (e.g., retun value of a call inst)
|
|
// they must be added to the live range list
|
|
|
|
suggestRegs4CallRets();
|
|
|
|
if( DEBUG_RA)
|
|
cout << "Initial Live Ranges constructed!" << endl;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Suggest colors for call and return args.
|
|
// Also create new LRs for implicit defs
|
|
|
|
void LiveRangeInfo::suggestRegs4CallRets()
|
|
{
|
|
|
|
CallRetInstrListType::const_iterator It = CallRetInstrList.begin();
|
|
|
|
for( ; It != CallRetInstrList.end(); ++It ) {
|
|
|
|
const MachineInstr *MInst = *It;
|
|
MachineOpCode OpCode = MInst->getOpCode();
|
|
|
|
if( (TM.getInstrInfo()).isReturn(OpCode) )
|
|
MRI.suggestReg4RetValue( MInst, *this);
|
|
|
|
else if( (TM.getInstrInfo()).isCall( OpCode ) )
|
|
MRI.suggestRegs4CallArgs( MInst, *this, RegClassList );
|
|
|
|
else
|
|
assert( 0 && "Non call/ret instr in CallRetInstrList" );
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void LiveRangeInfo::coalesceLRs()
|
|
{
|
|
|
|
/* Algorithm:
|
|
for each BB in method
|
|
for each machine instruction (inst)
|
|
for each definition (def) in inst
|
|
for each operand (op) of inst that is a use
|
|
if the def and op are of the same register type
|
|
if the def and op do not interfere //i.e., not simultaneously live
|
|
if (degree(LR of def) + degree(LR of op)) <= # avail regs
|
|
if both LRs do not have suggested colors
|
|
merge2IGNodes(def, op) // i.e., merge 2 LRs
|
|
|
|
*/
|
|
|
|
if( DEBUG_RA)
|
|
cout << endl << "Coalscing LRs ..." << endl;
|
|
|
|
Method::const_iterator BBI = Meth->begin(); // random iterator for BBs
|
|
|
|
for( ; BBI != Meth->end(); ++BBI) { // traverse BBs in random order
|
|
|
|
// get the iterator for machine instructions
|
|
const MachineCodeForBasicBlock& MIVec = (*BBI)->getMachineInstrVec();
|
|
MachineCodeForBasicBlock::const_iterator
|
|
MInstIterator = MIVec.begin();
|
|
|
|
// iterate over all the machine instructions in BB
|
|
for( ; MInstIterator != MIVec.end(); ++MInstIterator) {
|
|
|
|
const MachineInstr * MInst = *MInstIterator;
|
|
|
|
if( DEBUG_RA > 1) {
|
|
cout << " *Iterating over machine instr ";
|
|
MInst->dump();
|
|
cout << endl;
|
|
}
|
|
|
|
|
|
// iterate over MI operands to find defs
|
|
for(MachineInstr::val_const_op_iterator DefI(MInst);!DefI.done();++DefI){
|
|
|
|
if( DefI.isDef() ) { // iff this operand is a def
|
|
|
|
LiveRange *const LROfDef = getLiveRangeForValue( *DefI );
|
|
assert( LROfDef );
|
|
RegClass *const RCOfDef = LROfDef->getRegClass();
|
|
|
|
MachineInstr::val_const_op_iterator UseI(MInst);
|
|
for( ; !UseI.done(); ++UseI){ // for all uses
|
|
|
|
LiveRange *const LROfUse = getLiveRangeForValue( *UseI );
|
|
|
|
if( ! LROfUse ) { // if LR of use is not found
|
|
|
|
//don't warn about labels
|
|
if (!((*UseI)->getType())->isLabelType() && DEBUG_RA) {
|
|
cout<<" !! Warning: No LR for use "; printValue(*UseI);
|
|
cout << endl;
|
|
}
|
|
continue; // ignore and continue
|
|
}
|
|
|
|
if( LROfUse == LROfDef) // nothing to merge if they are same
|
|
continue;
|
|
|
|
//RegClass *const RCOfUse = LROfUse->getRegClass();
|
|
//if( RCOfDef == RCOfUse ) { // if the reg classes are the same
|
|
|
|
if( MRI.getRegType(LROfDef) == MRI.getRegType(LROfUse) ) {
|
|
|
|
// If the two RegTypes are the same
|
|
|
|
if( ! RCOfDef->getInterference(LROfDef, LROfUse) ) {
|
|
|
|
unsigned CombinedDegree =
|
|
LROfDef->getUserIGNode()->getNumOfNeighbors() +
|
|
LROfUse->getUserIGNode()->getNumOfNeighbors();
|
|
|
|
if( CombinedDegree <= RCOfDef->getNumOfAvailRegs() ) {
|
|
|
|
// if both LRs do not have suggested colors
|
|
if( ! (LROfDef->hasSuggestedColor() &&
|
|
LROfUse->hasSuggestedColor() ) ) {
|
|
|
|
RCOfDef->mergeIGNodesOfLRs(LROfDef, LROfUse);
|
|
unionAndUpdateLRs(LROfDef, LROfUse);
|
|
}
|
|
|
|
|
|
} // if combined degree is less than # of regs
|
|
|
|
} // if def and use do not interfere
|
|
|
|
}// if reg classes are the same
|
|
|
|
} // for all uses
|
|
|
|
} // if def
|
|
|
|
} // for all defs
|
|
|
|
} // for all machine instructions
|
|
|
|
} // for all BBs
|
|
|
|
if( DEBUG_RA)
|
|
cout << endl << "Coalscing Done!" << endl;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*--------------------------- Debug code for printing ---------------*/
|
|
|
|
|
|
void LiveRangeInfo::printLiveRanges()
|
|
{
|
|
LiveRangeMapType::iterator HMI = LiveRangeMap.begin(); // hash map iterator
|
|
cout << endl << "Printing Live Ranges from Hash Map:" << endl;
|
|
for( ; HMI != LiveRangeMap.end() ; HMI ++ ) {
|
|
if( (*HMI).first && (*HMI).second ) {
|
|
cout <<" "; printValue((*HMI).first); cout << "\t: ";
|
|
((*HMI).second)->printSet(); cout << endl;
|
|
}
|
|
}
|
|
}
|
|
|
|
|