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Make GVNPRE accurate report whether it modified the function or not.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37673 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-06-20 18:30:20 +00:00
parent 60c916bc72
commit 0304b2bc2b
1 changed files with 12 additions and 5 deletions
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17
lib/Transforms/Scalar/GVNPRE.cpp
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@ -351,7 +351,7 @@ namespace {
// For a given block, calculate the generated expressions, temporaries,
// and the AVAIL_OUT set
void cleanup();
void elimination();
void elimination(bool& changed_function);
void val_insert(std::set<Value*>& s, Value* v);
void val_replace(std::set<Value*>& s, Value* v);
@ -656,7 +656,7 @@ void GVNPRE::dump(const std::set<Value*>& s) const {
DOUT << "}\n\n";
}
void GVNPRE::elimination() {
void GVNPRE::elimination(bool& changed_function) {
DOUT << "\n\nPhase 3: Elimination\n\n";
std::vector<std::pair<Instruction*, Value*> > replace;
@ -693,6 +693,7 @@ void GVNPRE::elimination() {
std::pair<Instruction*, Value*> rep = replace.back();
replace.pop_back();
rep.first->replaceAllUsesWith(rep.second);
changed_function = true;
}
for (std::vector<Instruction*>::iterator I = erase.begin(), E = erase.end();
@ -716,6 +717,8 @@ bool GVNPRE::runOnFunction(Function &F) {
availableOut.clear();
anticipatedIn.clear();
invokeDep.clear();
bool changed_function = false;
std::map<BasicBlock*, std::set<Value*> > generatedExpressions;
std::map<BasicBlock*, std::set<PHINode*> > generatedPhis;
@ -798,7 +801,7 @@ bool GVNPRE::runOnFunction(Function &F) {
// If function has no exit blocks, only perform GVN
PostDominatorTree &PDT = getAnalysis<PostDominatorTree>();
if (PDT[&F.getEntryBlock()] == 0) {
elimination();
elimination(changed_function);
cleanup();
return true;
@ -1049,6 +1052,8 @@ bool GVNPRE::runOnFunction(Function &F) {
C->getName()+".gvnpre",
(*PI)->getTerminator());
changed_function = true;
VN.add(newVal, VN.lookup(U));
std::set<Value*>& predAvail = availableOut[*PI];
@ -1076,6 +1081,8 @@ bool GVNPRE::runOnFunction(Function &F) {
p->addIncoming(avail[*PI], *PI);
}
changed_function = true;
VN.add(p, VN.lookup(e));
DOUT << "Creating value: " << std::hex << p << std::dec << "\n";
@ -1106,10 +1113,10 @@ bool GVNPRE::runOnFunction(Function &F) {
}
// Phase 3: Eliminate
elimination();
elimination(changed_function);
// Phase 4: Cleanup
cleanup();
return true;
return changed_function;
}