[Analysis] Introduce isSoleCallToLocalFunction (NFC)

We check to see if a given CallBase is a sole call to a local function
at multiple places in InlineCost.cpp.  This patch factors out the
common code.

Differential Revision: https://reviews.llvm.org/D134114

1 files changed, 10 insertions, 8 deletions

diff --git a/llvm/lib/Analysis/InlineCost.cpp b/llvm/lib/Analysis/InlineCost.cpp
index 86e0b4b..e193cee 100644
--- a/llvm/lib/Analysis/InlineCost.cpp
+++ b/llvm/lib/Analysis/InlineCost.cpp
@@ -1063,6 +1063,13 @@ public:
   bool wasDecidedByCostThreshold() const { return DecidedByCostThreshold; }
 };
 
+// Return true if CB is the sole call to local function Callee.
+static bool isSoleCallToLocalFunction(const CallBase &CB,
+                                      const Function &Callee) {
+  return Callee.hasLocalLinkage() && Callee.hasOneLiveUse() &&
+         &Callee == CB.getCalledFunction();
+}
+
 class InlineCostFeaturesAnalyzer final : public CallAnalyzer {
 private:
   InlineCostFeatures Cost = {};
@@ -1236,8 +1243,7 @@ private:
         (F.getCallingConv() == CallingConv::Cold));
 
     set(InlineCostFeatureIndex::LastCallToStaticBonus,
-        (F.hasLocalLinkage() && F.hasOneLiveUse() &&
-         &F == CandidateCall.getCalledFunction()));
+        isSoleCallToLocalFunction(CandidateCall, F));
 
     // FIXME: we shouldn't repeat this logic in both the Features and Cost
     // analyzer - instead, we should abstract it to a common method in the
@@ -1913,12 +1919,10 @@ void InlineCostCallAnalyzer::updateThreshold(CallBase &Call, Function &Callee) {
   SingleBBBonus = Threshold * SingleBBBonusPercent / 100;
   VectorBonus = Threshold * VectorBonusPercent / 100;
 
-  bool OnlyOneCallAndLocalLinkage = F.hasLocalLinkage() && F.hasOneLiveUse() &&
-                                    &F == Call.getCalledFunction();
   // If there is only one call of the function, and it has internal linkage,
   // the cost of inlining it drops dramatically. It may seem odd to update
   // Cost in updateThreshold, but the bonus depends on the logic in this method.
-  if (OnlyOneCallAndLocalLinkage)
+  if (isSoleCallToLocalFunction(Call, F))
     Cost -= LastCallToStaticBonus;
 }
 
@@ -2712,12 +2716,10 @@ InlineResult CallAnalyzer::analyze() {
     onBlockAnalyzed(BB);
   }
 
-  bool OnlyOneCallAndLocalLinkage = F.hasLocalLinkage() && F.hasOneLiveUse() &&
-                                    &F == CandidateCall.getCalledFunction();
   // If this is a noduplicate call, we can still inline as long as
   // inlining this would cause the removal of the caller (so the instruction
   // is not actually duplicated, just moved).
-  if (!OnlyOneCallAndLocalLinkage && ContainsNoDuplicateCall)
+  if (!isSoleCallToLocalFunction(CandidateCall, F) && ContainsNoDuplicateCall)
     return InlineResult::failure("noduplicate");
 
   // If the callee's stack size exceeds the user-specified threshold,