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Fixes to type conversion stuff to match induction variables more frequently

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1417 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-12-05 06:34:00 +00:00
parent 6de230aca8
commit a8b6d43f2a
2 changed files with 128 additions and 31 deletions
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19
lib/Transforms/ExprTypeConvert.cpp
View File

@ -477,7 +477,6 @@ Value *ConvertExpressionToType(Value *V, const Type *Ty, ValueMapCache &VMC) {
#ifdef DEBUG_EXPR_CONVERT
cerr << "ExpIn: " << (void*)I << " " << I
<< "ExpOut: " << (void*)Res << " " << Res;
cerr << "ExpCREATED: " << (void*)Res << " " << Res;
#endif
if (I->use_empty()) {
@ -553,9 +552,8 @@ static bool OperandConvertableToType(User *U, Value *V, const Type *Ty,
return true;
case Instruction::Add:
if (V == I->getOperand(0) && isa<CastInst>(I->getOperand(1)) &&
isa<PointerType>(Ty)) {
Value *IndexVal = cast<CastInst>(I->getOperand(1))->getOperand(0);
if (isa<PointerType>(Ty)) {
Value *IndexVal = I->getOperand(V == I->getOperand(0) ? 1 : 0);
vector<Value*> Indices;
if (const Type *ETy = ConvertableToGEP(Ty, IndexVal, Indices)) {
const Type *RetTy = PointerType::get(ETy);
@ -732,9 +730,8 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
break;
case Instruction::Add:
if (OldVal == I->getOperand(0) && isa<CastInst>(I->getOperand(1)) &&
isa<PointerType>(NewTy)) {
Value *IndexVal = cast<CastInst>(I->getOperand(1))->getOperand(0);
if (isa<PointerType>(NewTy)) {
Value *IndexVal = I->getOperand(OldVal == I->getOperand(0) ? 1 : 0);
vector<Value*> Indices;
BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
@ -742,7 +739,7 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
// If successful, convert the add to a GEP
const Type *RetTy = PointerType::get(ETy);
// First operand is actually the given pointer...
Res = new GetElementPtrInst(NewVal, Indices);
Res = new GetElementPtrInst(NewVal, Indices, Name);
assert(cast<PointerType>(Res->getType())->getElementType() == ETy &&
"ConvertableToGEP broken!");
break;
@ -904,7 +901,7 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
ValueHandle::ValueHandle(ValueMapCache &VMC, Value *V)
: Instruction(Type::VoidTy, UserOp1, ""), Cache(VMC) {
#ifdef DEBUG_EXPR_CONVERT
cerr << "VH AQUIRING: " << (void*)V << " " << V;
//cerr << "VH AQUIRING: " << (void*)V << " " << V;
#endif
Operands.push_back(Use(V, this));
}
@ -915,7 +912,7 @@ static void RecursiveDelete(ValueMapCache &Cache, Instruction *I) {
assert(I->getParent() && "Inst not in basic block!");
#ifdef DEBUG_EXPR_CONVERT
cerr << "VH DELETING: " << (void*)I << " " << I;
//cerr << "VH DELETING: " << (void*)I << " " << I;
#endif
for (User::op_iterator OI = I->op_begin(), OE = I->op_end();
@ -946,7 +943,7 @@ ValueHandle::~ValueHandle() {
RecursiveDelete(Cache, dyn_cast<Instruction>(V));
} else {
#ifdef DEBUG_EXPR_CONVERT
cerr << "VH RELEASING: " << (void*)Operands[0].get() << " " << Operands[0]->use_size() << " " << Operands[0];
//cerr << "VH RELEASING: " << (void*)Operands[0].get() << " " << Operands[0]->use_size() << " " << Operands[0];
#endif
}
}

110
lib/Transforms/LevelRaise.cpp
View File

@ -51,7 +51,84 @@ static inline bool isReinterpretingCast(const CastInst *CI) {
#if 0 // Unneccesary code, handled by convert exprs
// Peephole optimize the following instructions:
// %t1 = cast ? to x *
// %t2 = add x * %SP, %t1 ;; Constant must be 2nd operand
//
// Into: %t3 = getelementptr {<...>} * %SP, <element indices>
// %t2 = cast <eltype> * %t3 to {<...>}*
//
static bool HandleCastToPointer(BasicBlock::iterator BI,
const PointerType *DestPTy) {
CastInst *CI = cast<CastInst>(*BI);
// Scan all of the uses, looking for any uses that are not add
// instructions. If we have non-adds, do not make this transformation.
//
for (Value::use_iterator I = CI->use_begin(), E = CI->use_end();
I != E; ++I) {
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(*I)) {
if (BO->getOpcode() != Instruction::Add)
return false;
} else {
return false;
}
}
vector<Value*> Indices;
Value *Src = CI->getOperand(0);
const Type *Result = ConvertableToGEP(DestPTy, Src, Indices, &BI);
const PointerType *UsedType = DestPTy;
// If we fail, check to see if we have an pointer source type that, if
// converted to an unsized array type, would work. In this case, we propogate
// the cast forward to the input of the add instruction.
//
if (Result == 0 && getPointedToComposite(DestPTy) == 0) {
// Make an unsized array and try again...
UsedType = PointerType::get(ArrayType::get(DestPTy->getElementType()));
Result = ConvertableToGEP(UsedType, Src, Indices, &BI);
}
if (Result == 0) return false; // Not convertable...
PRINT_PEEPHOLE2("cast-add-to-gep:in", Src, CI);
// If we have a getelementptr capability... transform all of the
// add instruction uses into getelementptr's.
for (Value::use_iterator UI = CI->use_begin(), E = CI->use_end();
UI != E; ++UI) {
Instruction *I = cast<Instruction>(*UI);
assert(I->getOpcode() == Instruction::Add && I->getNumOperands() == 2 &&
"Use is not a valid add instruction!");
// Get the value added to the cast result pointer...
Value *OtherPtr = I->getOperand((I->getOperand(0) == CI) ? 1 : 0);
BasicBlock *BB = I->getParent();
BasicBlock::iterator AddIt = find(BB->getInstList().begin(),
BB->getInstList().end(), I);
if (UsedType != DestPTy) {
// Insert a cast of the incoming value to something addressable...
CastInst *C = new CastInst(OtherPtr, UsedType, OtherPtr->getName());
AddIt = BB->getInstList().insert(AddIt, C)+1;
OtherPtr = C;
}
GetElementPtrInst *GEP = new GetElementPtrInst(OtherPtr, Indices,
I->getName());
PRINT_PEEPHOLE1("cast-add-to-gep:i", I);
// Replace the old add instruction with the shiny new GEP inst
ReplaceInstWithInst(BB->getInstList(), AddIt, GEP);
PRINT_PEEPHOLE1("cast-add-to-gep:o", GEP);
}
return true;
}
#endif
// Peephole optimize the following instructions:
// %t1 = cast ulong <const int> to {<...>} *
@ -149,6 +226,9 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
// Check to see if it's a cast of an instruction that does not depend on the
// specific type of the operands to do it's job.
if (!isReinterpretingCast(CI)) {
// Check to see if we can convert the source of the cast to match the
// destination type of the cast...
//
ValueTypeCache ConvertedTypes;
if (ValueConvertableToType(CI, Src->getType(), ConvertedTypes)) {
PRINT_PEEPHOLE2("CAST-DEST-EXPR-CONV:in ", Src, CI);
@ -165,7 +245,11 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
cerr << "DONE CONVERTING EXPR TYPE: \n\n";// << BB->getParent();
#endif
return true;
} else {
}
// Check to see if we can convert the users of the cast value to match the
// source type of the cast...
//
ConvertedTypes.clear();
if (ExpressionConvertableToType(Src, DestTy, ConvertedTypes)) {
PRINT_PEEPHOLE2("CAST-SRC-EXPR-CONV:in ", Src, CI);
@ -185,8 +269,16 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
#endif
return true;
}
#if 0
// Otherwise find out it this cast is a cast to a pointer type, which is
// then added to some other pointer, then loaded or stored through. If
// so, convert the add into a getelementptr instruction...
//
if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
if (HandleCastToPointer(BI, DestPTy))
return true;
}
#endif
}
// Check to see if we are casting from a structure pointer to a pointer to
@ -355,7 +447,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
return true;
}
#if 0
// Peephole optimize the following instructions:
// %t1 = cast <ty> * %t0 to <ty2> *
// %V = load <ty2> * %t1
@ -394,6 +486,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
return true;
}
}
#endif
} else if (I->getOpcode() == Instruction::Add &&
isa<CastInst>(I->getOperand(1))) {
@ -544,6 +637,10 @@ static bool DoInsertArrayCasts(Method *M) {
// TODO: insert casts for alloca, malloc, and function call results. Also,
// look for pointers that already have casts, to add to the map.
if (Changed) {
cerr << "Inserted casts:\n" << M;
}
return Changed;
}
@ -564,12 +661,15 @@ bool RaisePointerReferences::doit(Method *M) {
// arrays...
//
bool Changed = false, LocalChange;
Changed |= DoInsertArrayCasts(M);
do {
#ifdef DEBUG_PEEPHOLE_INSTS
cerr << "Looping: \n" << M;
#endif
LocalChange = DoInsertArrayCasts(M);
// Iterate over the method, refining it, until it converges on a stable
// state
bool LocalChange = false;
while (DoRaisePass(M)) LocalChange = true;
Changed |= LocalChange;