[Inliner] Pass nullptr for the ORE param of getInlineCost if RemarkEnabled

is false.

Right now for inliner and partial inliner, we always pass the address of a
valid ORE object to getInlineCost even if RemarkEnabled is false because of
no -Rpass is specified. Since ComputeFullInlineCost will be set to true if
ORE is non-null in getInlineCost, this introduces the problem that in
getInlineCost we cannot return early even if we already know the cost is
definitely higher than the threshold. It is a general problem for compile
time.

This patch fixes that by pass nullptr as the ORE argument if RemarkEnabled is
false.

Differential Revision: https://reviews.llvm.org/D58399

llvm-svn: 354542

llvm/lib/Transforms/IPO/Inliner.cpp

@@ -1005,8 +1005,11 @@ PreservedAnalyses InlinerPass::run(LazyCallGraph::SCC &InitialC,
     auto GetInlineCost = [&](CallSite CS) {
       Function &Callee = *CS.getCalledFunction();
       auto &CalleeTTI = FAM.getResult<TargetIRAnalysis>(Callee);
+      bool RemarksEnabled =
+          Callee.getContext().getDiagHandlerPtr()->isMissedOptRemarkEnabled(
+              DEBUG_TYPE);
       return getInlineCost(CS, Params, CalleeTTI, GetAssumptionCache, {GetBFI},
-                           PSI, &ORE);
+                           PSI, RemarksEnabled ? &ORE : nullptr);
     };
 
     // Now process as many calls as we have within this caller in the sequnece.

llvm/lib/Transforms/IPO/PartialInlining.cpp

@@ -772,8 +772,12 @@ bool PartialInlinerImpl::shouldPartialInline(
 
   Function *Caller = CS.getCaller();
   auto &CalleeTTI = (*GetTTI)(*Callee);
-  InlineCost IC = getInlineCost(CS, getInlineParams(), CalleeTTI,
-                                *GetAssumptionCache, GetBFI, PSI, &ORE);
+  bool RemarksEnabled =
+      Callee->getContext().getDiagHandlerPtr()->isMissedOptRemarkEnabled(
+          DEBUG_TYPE);
+  InlineCost IC =
+      getInlineCost(CS, getInlineParams(), CalleeTTI, *GetAssumptionCache,
+                    GetBFI, PSI, RemarksEnabled ? &ORE : nullptr);
 
   if (IC.isAlways()) {
     ORE.emit([&]() {