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Speed up -instcombine by 20% by avoiding a particularly expensive passmgr call.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34902 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-03-04 04:27:24 +00:00
parent 55091782c1
commit f964f321eb
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -74,6 +74,7 @@ namespace {
std::vector<Instruction*> Worklist; std::vector<Instruction*> Worklist;
DenseMap<Instruction*, unsigned> WorklistMap; DenseMap<Instruction*, unsigned> WorklistMap;
TargetData *TD; TargetData *TD;
bool MustPreserveLCSSA;
public: public:
/// AddToWorkList - Add the specified instruction to the worklist if it /// AddToWorkList - Add the specified instruction to the worklist if it
/// isn't already in it. /// isn't already in it.
@ -7685,7 +7686,7 @@ static bool DeadPHICycle(PHINode *PN, std::set<PHINode*> &PotentiallyDeadPHIs) {
// //
Instruction *InstCombiner::visitPHINode(PHINode &PN) { Instruction *InstCombiner::visitPHINode(PHINode &PN) {
// If LCSSA is around, don't mess with Phi nodes // If LCSSA is around, don't mess with Phi nodes
if (mustPreserveAnalysisID(LCSSAID)) return 0; if (MustPreserveLCSSA) return 0;
if (Value *V = PN.hasConstantValue()) if (Value *V = PN.hasConstantValue())
return ReplaceInstUsesWith(PN, V); return ReplaceInstUsesWith(PN, V);
@ -9344,6 +9345,8 @@ bool InstCombiner::DoOneIteration(Function &F, unsigned Iteration) {
bool InstCombiner::runOnFunction(Function &F) { bool InstCombiner::runOnFunction(Function &F) {
MustPreserveLCSSA = mustPreserveAnalysisID(LCSSAID);
bool EverMadeChange = false; bool EverMadeChange = false;
// Iterate while there is work to do. // Iterate while there is work to do.