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Minor fixes here and there

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8963 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-10-08 16:21:03 +00:00
parent 7d275f459b
commit 3d405b07b4
1 changed files with 21 additions and 22 deletions
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43
lib/Transforms/Scalar/SCCP.cpp
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@ -107,28 +107,28 @@ private:
// is not already a constant, add it to the instruction work list so that
// the users of the instruction are updated later.
//
inline bool markConstant(Instruction *I, Constant *V) {
if (ValueState[I].markConstant(V)) {
DEBUG(std::cerr << "markConstant: " << V << " = " << I);
inline void markConstant(InstVal &IV, Instruction *I, Constant *C) {
if (IV.markConstant(C)) {
DEBUG(std::cerr << "markConstant: " << *C << ": " << *I);
InstWorkList.push_back(I);
return true;
}
return false;
}
inline void markConstant(Instruction *I, Constant *C) {
markConstant(ValueState[I], I, C);
}
// markValueOverdefined - Make a value be marked as "overdefined". If the
// value is not already overdefined, add it to the instruction work list so
// that the users of the instruction are updated later.
//
inline bool markOverdefined(Value *V) {
if (ValueState[V].markOverdefined()) {
if (Instruction *I = dyn_cast<Instruction>(V)) {
DEBUG(std::cerr << "markOverdefined: " << V);
InstWorkList.push_back(I); // Only instructions go on the work list
}
return true;
inline void markOverdefined(InstVal &IV, Instruction *I) {
if (IV.markOverdefined()) {
DEBUG(std::cerr << "markOverdefined: " << *I);
InstWorkList.push_back(I); // Only instructions go on the work list
}
return false;
}
inline void markOverdefined(Instruction *I) {
markOverdefined(ValueState[I], I);
}
// getValueState - Return the InstVal object that corresponds to the value.
@ -193,7 +193,7 @@ private:
void visitGetElementPtrInst(GetElementPtrInst &I);
void visitCallInst (Instruction &I) { markOverdefined(&I); }
void visitInvokeInst (TerminatorInst &I) {
markOverdefined(&I);
if (I.getType() != Type::VoidTy) markOverdefined(&I);
visitTerminatorInst(I);
}
void visitUnwindInst (TerminatorInst &I) { /*returns void*/ }
@ -442,7 +442,8 @@ bool SCCP::isEdgeFeasible(BasicBlock *From, BasicBlock *To) {
// successors executable.
//
void SCCP::visitPHINode(PHINode &PN) {
if (getValueState(&PN).isOverdefined()) return; // Quick exit
InstVal &PNIV = getValueState(&PN);
if (PNIV.isOverdefined()) return; // Quick exit
// Look at all of the executable operands of the PHI node. If any of them
// are overdefined, the PHI becomes overdefined as well. If they are all
@ -457,7 +458,7 @@ void SCCP::visitPHINode(PHINode &PN) {
if (isEdgeFeasible(PN.getIncomingBlock(i), PN.getParent())) {
if (IV.isOverdefined()) { // PHI node becomes overdefined!
markOverdefined(&PN);
markOverdefined(PNIV, &PN);
return;
}
@ -473,7 +474,7 @@ void SCCP::visitPHINode(PHINode &PN) {
// Yes there is. This means the PHI node is not constant.
// You must be overdefined poor PHI.
//
markOverdefined(&PN); // The PHI node now becomes overdefined
markOverdefined(PNIV, &PN); // The PHI node now becomes overdefined
return; // I'm done analyzing you
}
}
@ -486,7 +487,7 @@ void SCCP::visitPHINode(PHINode &PN) {
// this is the case, the PHI remains undefined.
//
if (OperandVal)
markConstant(&PN, OperandVal); // Aquire operand value
markConstant(PNIV, &PN, OperandVal); // Aquire operand value
}
void SCCP::visitTerminatorInst(TerminatorInst &TI) {
@ -510,12 +511,10 @@ void SCCP::visitCastInst(CastInst &I) {
Constant *Result =
ConstantFoldCastInstruction(VState.getConstant(), I.getType());
if (Result) {
// This instruction constant folds!
if (Result) // If this instruction constant folds!
markConstant(&I, Result);
} else {
else
markOverdefined(&I); // Don't know how to fold this instruction. :(
}
}
}