-//===- ConstantProp.cpp - Code to perform Simple Constant Propogation -----===//
+//===- ConstantProp.cpp - Code to perform Simple Constant Propagation -----===//
+//
+// The LLVM Compiler Infrastructure
//
-// This file implements constant propogation and merging:
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements constant propagation and merging:
//
// Specifically, this:
// * Converts instructions like "add int 1, 2" into 3
namespace {
Statistic<> NumInstKilled("constprop", "Number of instructions killed");
- struct ConstantPropogation : public FunctionPass {
+ struct ConstantPropagation : public FunctionPass {
bool runOnFunction(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.preservesCFG();
+ AU.setPreservesCFG();
}
};
- RegisterOpt<ConstantPropogation> X("constprop","Simple constant propogation");
+ RegisterOpt<ConstantPropagation> X("constprop","Simple constant propagation");
}
-Pass *createConstantPropogationPass() {
- return new ConstantPropogation();
+Pass *createConstantPropagationPass() {
+ return new ConstantPropagation();
}
-bool ConstantPropogation::runOnFunction(Function &F) {
+bool ConstantPropagation::runOnFunction(Function &F) {
// Initialize the worklist to all of the instructions ready to process...
std::set<Instruction*> WorkList(inst_begin(F), inst_end(F));
bool Changed = false;
if (!I->use_empty()) // Don't muck with dead instructions...
if (Constant *C = ConstantFoldInstruction(I)) {
// Add all of the users of this instruction to the worklist, they might
- // be constant propogatable now...
+ // be constant propagatable now...
for (Value::use_iterator UI = I->use_begin(), UE = I->use_end();
UI != UE; ++UI)
WorkList.insert(cast<Instruction>(*UI));