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https://github.com/c64scene-ar/llvm-6502.git
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Fixes to type conversion stuff to match induction variables more frequently
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1417 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -477,7 +477,6 @@ Value *ConvertExpressionToType(Value *V, const Type *Ty, ValueMapCache &VMC) {
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#ifdef DEBUG_EXPR_CONVERT
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cerr << "ExpIn: " << (void*)I << " " << I
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<< "ExpOut: " << (void*)Res << " " << Res;
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cerr << "ExpCREATED: " << (void*)Res << " " << Res;
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#endif
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if (I->use_empty()) {
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@ -553,9 +552,8 @@ static bool OperandConvertableToType(User *U, Value *V, const Type *Ty,
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return true;
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case Instruction::Add:
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if (V == I->getOperand(0) && isa<CastInst>(I->getOperand(1)) &&
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isa<PointerType>(Ty)) {
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Value *IndexVal = cast<CastInst>(I->getOperand(1))->getOperand(0);
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if (isa<PointerType>(Ty)) {
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Value *IndexVal = I->getOperand(V == I->getOperand(0) ? 1 : 0);
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vector<Value*> Indices;
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if (const Type *ETy = ConvertableToGEP(Ty, IndexVal, Indices)) {
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const Type *RetTy = PointerType::get(ETy);
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@ -732,9 +730,8 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
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break;
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case Instruction::Add:
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if (OldVal == I->getOperand(0) && isa<CastInst>(I->getOperand(1)) &&
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isa<PointerType>(NewTy)) {
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Value *IndexVal = cast<CastInst>(I->getOperand(1))->getOperand(0);
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if (isa<PointerType>(NewTy)) {
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Value *IndexVal = I->getOperand(OldVal == I->getOperand(0) ? 1 : 0);
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vector<Value*> Indices;
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BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
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@ -742,7 +739,7 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
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// If successful, convert the add to a GEP
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const Type *RetTy = PointerType::get(ETy);
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// First operand is actually the given pointer...
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Res = new GetElementPtrInst(NewVal, Indices);
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Res = new GetElementPtrInst(NewVal, Indices, Name);
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assert(cast<PointerType>(Res->getType())->getElementType() == ETy &&
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"ConvertableToGEP broken!");
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break;
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@ -904,7 +901,7 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
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ValueHandle::ValueHandle(ValueMapCache &VMC, Value *V)
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: Instruction(Type::VoidTy, UserOp1, ""), Cache(VMC) {
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#ifdef DEBUG_EXPR_CONVERT
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cerr << "VH AQUIRING: " << (void*)V << " " << V;
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//cerr << "VH AQUIRING: " << (void*)V << " " << V;
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#endif
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Operands.push_back(Use(V, this));
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}
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@ -915,7 +912,7 @@ static void RecursiveDelete(ValueMapCache &Cache, Instruction *I) {
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assert(I->getParent() && "Inst not in basic block!");
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#ifdef DEBUG_EXPR_CONVERT
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cerr << "VH DELETING: " << (void*)I << " " << I;
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//cerr << "VH DELETING: " << (void*)I << " " << I;
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#endif
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for (User::op_iterator OI = I->op_begin(), OE = I->op_end();
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@ -946,7 +943,7 @@ ValueHandle::~ValueHandle() {
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RecursiveDelete(Cache, dyn_cast<Instruction>(V));
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} else {
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#ifdef DEBUG_EXPR_CONVERT
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cerr << "VH RELEASING: " << (void*)Operands[0].get() << " " << Operands[0]->use_size() << " " << Operands[0];
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//cerr << "VH RELEASING: " << (void*)Operands[0].get() << " " << Operands[0]->use_size() << " " << Operands[0];
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#endif
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}
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}
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@ -51,7 +51,84 @@ static inline bool isReinterpretingCast(const CastInst *CI) {
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#if 0 // Unneccesary code, handled by convert exprs
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// Peephole optimize the following instructions:
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// %t1 = cast ? to x *
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// %t2 = add x * %SP, %t1 ;; Constant must be 2nd operand
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//
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// Into: %t3 = getelementptr {<...>} * %SP, <element indices>
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// %t2 = cast <eltype> * %t3 to {<...>}*
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//
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static bool HandleCastToPointer(BasicBlock::iterator BI,
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const PointerType *DestPTy) {
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CastInst *CI = cast<CastInst>(*BI);
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// Scan all of the uses, looking for any uses that are not add
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// instructions. If we have non-adds, do not make this transformation.
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//
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for (Value::use_iterator I = CI->use_begin(), E = CI->use_end();
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I != E; ++I) {
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if (BinaryOperator *BO = dyn_cast<BinaryOperator>(*I)) {
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if (BO->getOpcode() != Instruction::Add)
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return false;
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} else {
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return false;
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}
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}
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vector<Value*> Indices;
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Value *Src = CI->getOperand(0);
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const Type *Result = ConvertableToGEP(DestPTy, Src, Indices, &BI);
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const PointerType *UsedType = DestPTy;
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// If we fail, check to see if we have an pointer source type that, if
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// converted to an unsized array type, would work. In this case, we propogate
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// the cast forward to the input of the add instruction.
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//
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if (Result == 0 && getPointedToComposite(DestPTy) == 0) {
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// Make an unsized array and try again...
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UsedType = PointerType::get(ArrayType::get(DestPTy->getElementType()));
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Result = ConvertableToGEP(UsedType, Src, Indices, &BI);
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}
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if (Result == 0) return false; // Not convertable...
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PRINT_PEEPHOLE2("cast-add-to-gep:in", Src, CI);
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// If we have a getelementptr capability... transform all of the
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// add instruction uses into getelementptr's.
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for (Value::use_iterator UI = CI->use_begin(), E = CI->use_end();
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UI != E; ++UI) {
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Instruction *I = cast<Instruction>(*UI);
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assert(I->getOpcode() == Instruction::Add && I->getNumOperands() == 2 &&
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"Use is not a valid add instruction!");
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// Get the value added to the cast result pointer...
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Value *OtherPtr = I->getOperand((I->getOperand(0) == CI) ? 1 : 0);
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BasicBlock *BB = I->getParent();
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BasicBlock::iterator AddIt = find(BB->getInstList().begin(),
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BB->getInstList().end(), I);
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if (UsedType != DestPTy) {
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// Insert a cast of the incoming value to something addressable...
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CastInst *C = new CastInst(OtherPtr, UsedType, OtherPtr->getName());
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AddIt = BB->getInstList().insert(AddIt, C)+1;
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OtherPtr = C;
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}
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GetElementPtrInst *GEP = new GetElementPtrInst(OtherPtr, Indices,
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I->getName());
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PRINT_PEEPHOLE1("cast-add-to-gep:i", I);
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// Replace the old add instruction with the shiny new GEP inst
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ReplaceInstWithInst(BB->getInstList(), AddIt, GEP);
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PRINT_PEEPHOLE1("cast-add-to-gep:o", GEP);
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}
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return true;
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}
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#endif
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// Peephole optimize the following instructions:
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// %t1 = cast ulong <const int> to {<...>} *
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@ -128,7 +205,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
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// Peephole optimize the following instructions:
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// %tmp = cast <ty> %V to <ty2>
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// %V = cast <ty2> %tmp to <ty3> ; Where ty & ty2 are same size
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// %V = cast <ty2> %tmp to <ty3> ; Where ty & ty2 are same size
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//
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// Into: cast <ty> %V to <ty3>
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//
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@ -149,6 +226,9 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
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// Check to see if it's a cast of an instruction that does not depend on the
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// specific type of the operands to do it's job.
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if (!isReinterpretingCast(CI)) {
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// Check to see if we can convert the source of the cast to match the
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// destination type of the cast...
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//
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ValueTypeCache ConvertedTypes;
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if (ValueConvertableToType(CI, Src->getType(), ConvertedTypes)) {
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PRINT_PEEPHOLE2("CAST-DEST-EXPR-CONV:in ", Src, CI);
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@ -165,28 +245,40 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
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cerr << "DONE CONVERTING EXPR TYPE: \n\n";// << BB->getParent();
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#endif
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return true;
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} else {
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ConvertedTypes.clear();
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if (ExpressionConvertableToType(Src, DestTy, ConvertedTypes)) {
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PRINT_PEEPHOLE2("CAST-SRC-EXPR-CONV:in ", Src, CI);
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}
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// Check to see if we can convert the users of the cast value to match the
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// source type of the cast...
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//
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ConvertedTypes.clear();
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if (ExpressionConvertableToType(Src, DestTy, ConvertedTypes)) {
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PRINT_PEEPHOLE2("CAST-SRC-EXPR-CONV:in ", Src, CI);
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#ifdef DEBUG_PEEPHOLE_INSTS
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cerr << "\nCONVERTING SRC EXPR TYPE:\n";
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cerr << "\nCONVERTING SRC EXPR TYPE:\n";
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#endif
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ValueMapCache ValueMap;
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Value *E = ConvertExpressionToType(Src, DestTy, ValueMap);
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if (Constant *CPV = dyn_cast<Constant>(E))
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CI->replaceAllUsesWith(CPV);
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ValueMapCache ValueMap;
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Value *E = ConvertExpressionToType(Src, DestTy, ValueMap);
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if (Constant *CPV = dyn_cast<Constant>(E))
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CI->replaceAllUsesWith(CPV);
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BI = BB->begin(); // Rescan basic block. BI might be invalidated.
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PRINT_PEEPHOLE1("CAST-SRC-EXPR-CONV:out", E);
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BI = BB->begin(); // Rescan basic block. BI might be invalidated.
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PRINT_PEEPHOLE1("CAST-SRC-EXPR-CONV:out", E);
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#ifdef DEBUG_PEEPHOLE_INSTS
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cerr << "DONE CONVERTING SRC EXPR TYPE: \n\n";// << BB->getParent();
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cerr << "DONE CONVERTING SRC EXPR TYPE: \n\n";// << BB->getParent();
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#endif
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return true;
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}
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return true;
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}
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#if 0
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// Otherwise find out it this cast is a cast to a pointer type, which is
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// then added to some other pointer, then loaded or stored through. If
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// so, convert the add into a getelementptr instruction...
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//
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if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
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if (HandleCastToPointer(BI, DestPTy))
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return true;
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}
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#endif
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}
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// Check to see if we are casting from a structure pointer to a pointer to
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@ -355,7 +447,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
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return true;
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}
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#if 0
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// Peephole optimize the following instructions:
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// %t1 = cast <ty> * %t0 to <ty2> *
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// %V = load <ty2> * %t1
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@ -394,6 +486,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
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return true;
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}
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}
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#endif
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} else if (I->getOpcode() == Instruction::Add &&
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isa<CastInst>(I->getOperand(1))) {
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@ -544,6 +637,10 @@ static bool DoInsertArrayCasts(Method *M) {
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// TODO: insert casts for alloca, malloc, and function call results. Also,
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// look for pointers that already have casts, to add to the map.
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if (Changed) {
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cerr << "Inserted casts:\n" << M;
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}
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return Changed;
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}
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@ -564,12 +661,15 @@ bool RaisePointerReferences::doit(Method *M) {
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// arrays...
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//
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bool Changed = false, LocalChange;
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Changed |= DoInsertArrayCasts(M);
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do {
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#ifdef DEBUG_PEEPHOLE_INSTS
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cerr << "Looping: \n" << M;
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#endif
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LocalChange = DoInsertArrayCasts(M);
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// Iterate over the method, refining it, until it converges on a stable
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// state
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bool LocalChange = false;
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while (DoRaisePass(M)) LocalChange = true;
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Changed |= LocalChange;
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