[Inliner] Only compute fully inline cost when remarks are enabled.

Prior to this change (and after r311371), we computed it
unconditionally, causin gsevere compile time regressions (in some
cases, 5 to 10x).

llvm-svn: 311804

1 files changed, 11 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/IPO/InlineSimple.cpp b/llvm/lib/Transforms/IPO/InlineSimple.cpp
index 1af40d3dab8..b7a7979bb56 100644
--- a/llvm/lib/Transforms/IPO/InlineSimple.cpp
+++ b/llvm/lib/Transforms/IPO/InlineSimple.cpp
@@ -57,13 +57,23 @@ public:
   InlineCost getInlineCost(CallSite CS) override {
     Function *Callee = CS.getCalledFunction();
     TargetTransformInfo &TTI = TTIWP->getTTI(*Callee);
+
+    bool RemarksEnabled = false;
+    const auto &BBs = CS.getCaller()->getBasicBlockList();
+    if (!BBs.empty()) {
+      auto DI = OptimizationRemark(DEBUG_TYPE, "", DebugLoc(), &BBs.front());
+      if (DI.isEnabled())
+        RemarksEnabled = true;
+    }
     OptimizationRemarkEmitter ORE(CS.getCaller());
+
     std::function<AssumptionCache &(Function &)> GetAssumptionCache =
         [&](Function &F) -> AssumptionCache & {
       return ACT->getAssumptionCache(F);
     };
     return llvm::getInlineCost(CS, Params, TTI, GetAssumptionCache,
-                               /*GetBFI=*/None, PSI, &ORE);
+                               /*GetBFI=*/None, PSI,
+                               RemarksEnabled ? &ORE : nullptr);
   }
 
   bool runOnSCC(CallGraphSCC &SCC) override;