[ORE] Move loop invariant ORE checks outside the PM loop.

Summary:
This takes 22ms out of ~20s compiling sqlite3.c because we call it
for every unit of compilation and every pass.

Reviewers: paquette, anemet

Subscribers: mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D49586

llvm-svn: 337654

llvm/include/llvm/IR/Module.h

@@ -256,6 +256,13 @@ public:
   /// versions when the pass does not change.
   std::unique_ptr<RandomNumberGenerator> createRNG(const Pass* P) const;
 
+  /// Return true if size-info optimization remark is enabled, false
+  /// otherwise.
+  bool shouldEmitInstrCountChangedRemark() {
+    return getContext().getDiagHandlerPtr()->isAnalysisRemarkEnabled(
+        "size-info");
+  }
+
   /// @}
   /// @name Module Level Mutators
   /// @{

llvm/lib/Analysis/CallGraphSCCPass.cpp

@@ -130,12 +130,16 @@ bool CGPassManager::RunPassOnSCC(Pass *P, CallGraphSCC &CurSCC,
     }
 
     {
+      unsigned InstrCount = 0;
+      bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
       TimeRegion PassTimer(getPassTimer(CGSP));
-      unsigned InstrCount = initSizeRemarkInfo(M);
+      if (EmitICRemark)
+        InstrCount = initSizeRemarkInfo(M);
       Changed = CGSP->runOnSCC(CurSCC);
 
       // If the pass modified the module, it may have modified the instruction
       // count of the module. Try emitting a remark.
+      if (EmitICRemark)
         emitInstrCountChangedRemark(P, M, InstrCount);
     }
     

llvm/lib/Analysis/LoopPass.cpp

@@ -193,6 +193,8 @@ bool LPPassManager::runOnFunction(Function &F) {
   }
 
   // Walk Loops
+  unsigned InstrCount = 0;
+  bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
   while (!LQ.empty()) {
     CurrentLoopDeleted = false;
     CurrentLoop = LQ.back();
@@ -210,8 +212,10 @@ bool LPPassManager::runOnFunction(Function &F) {
       {
         PassManagerPrettyStackEntry X(P, *CurrentLoop->getHeader());
         TimeRegion PassTimer(getPassTimer(P));
-        unsigned InstrCount = initSizeRemarkInfo(M);
+        if (EmitICRemark)
+          InstrCount = initSizeRemarkInfo(M);
         Changed |= P->runOnLoop(CurrentLoop, *this);
+        if (EmitICRemark)
           emitInstrCountChangedRemark(P, M, InstrCount);
       }
 

llvm/lib/IR/LegacyPassManager.cpp

@@ -137,17 +137,11 @@ bool PMDataManager::isPassDebuggingExecutionsOrMore() const {
 
 unsigned PMDataManager::initSizeRemarkInfo(Module &M) {
   // Only calculate getInstructionCount if the size-info remark is requested.
-  if (M.getContext().getDiagHandlerPtr()->isAnalysisRemarkEnabled("size-info"))
   return M.getInstructionCount();
-  return 0;
 }
 
 void PMDataManager::emitInstrCountChangedRemark(Pass *P, Module &M,
                                                 unsigned CountBefore) {
-  // Did the user request the remark? If not, quit.
-  if (!M.getContext().getDiagHandlerPtr()->isAnalysisRemarkEnabled("size-info"))
-    return;
-
   // We need a function containing at least one basic block in order to output
   // remarks. Since it's possible that the first function in the module doesn't
   // actually contain a basic block, we have to go and find one that's suitable
@@ -1349,6 +1343,8 @@ bool BBPassManager::runOnFunction(Function &F) {
   bool Changed = doInitialization(F);
   Module &M = *F.getParent();
 
+  unsigned InstrCount = 0;
+  bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
   for (BasicBlock &BB : F)
     for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
       BasicBlockPass *BP = getContainedPass(Index);
@@ -1363,8 +1359,10 @@ bool BBPassManager::runOnFunction(Function &F) {
         // If the pass crashes, remember this.
         PassManagerPrettyStackEntry X(BP, BB);
         TimeRegion PassTimer(getPassTimer(BP));
-        unsigned InstrCount = initSizeRemarkInfo(M);
+        if (EmitICRemark)
+          InstrCount = initSizeRemarkInfo(M);
         LocalChanged |= BP->runOnBasicBlock(BB);
+        if (EmitICRemark)
           emitInstrCountChangedRemark(BP, M, InstrCount);
       }
 
@@ -1569,6 +1567,8 @@ bool FPPassManager::runOnFunction(Function &F) {
   // Collect inherited analysis from Module level pass manager.
   populateInheritedAnalysis(TPM->activeStack);
 
+  unsigned InstrCount = 0;
+  bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
   for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
     FunctionPass *FP = getContainedPass(Index);
     bool LocalChanged = false;
@@ -1581,8 +1581,10 @@ bool FPPassManager::runOnFunction(Function &F) {
     {
       PassManagerPrettyStackEntry X(FP, F);
       TimeRegion PassTimer(getPassTimer(FP));
-      unsigned InstrCount = initSizeRemarkInfo(M);
+      if (EmitICRemark)
+        InstrCount = initSizeRemarkInfo(M);
       LocalChanged |= FP->runOnFunction(F);
+      if (EmitICRemark)
         emitInstrCountChangedRemark(FP, M, InstrCount);
     }
 
@@ -1647,6 +1649,8 @@ MPPassManager::runOnModule(Module &M) {
   for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index)
     Changed |= getContainedPass(Index)->doInitialization(M);
 
+  unsigned InstrCount = 0;
+  bool EmitICRemark = M.shouldEmitInstrCountChangedRemark();
   for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
     ModulePass *MP = getContainedPass(Index);
     bool LocalChanged = false;
@@ -1660,8 +1664,10 @@ MPPassManager::runOnModule(Module &M) {
       PassManagerPrettyStackEntry X(MP, M);
       TimeRegion PassTimer(getPassTimer(MP));
 
-      unsigned InstrCount = initSizeRemarkInfo(M);
+      if (EmitICRemark)
+        InstrCount = initSizeRemarkInfo(M);
       LocalChanged |= MP->runOnModule(M);
+      if (EmitICRemark)
         emitInstrCountChangedRemark(MP, M, InstrCount);
     }