[llvm] 54bd375 - [OpenMP][NFC] Add convenient helper and early exit check

[Johannes Doerfert via llvm-commits]

Author: Johannes Doerfert
Date: 2020-07-11T00:51:51-05:00
New Revision: 54bd3751ceebe6eb67804a1ed8be72943817852f

URL: https://github.com/llvm/llvm-project/commit/54bd3751ceebe6eb67804a1ed8be72943817852f
DIFF: https://github.com/llvm/llvm-project/commit/54bd3751ceebe6eb67804a1ed8be72943817852f.diff

LOG: [OpenMP][NFC] Add convenient helper and early exit check

Added: 
    

Modified: 
    llvm/lib/Transforms/IPO/OpenMPOpt.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
index d7572bf7dc53..b2e30a4d2b79 100644
--- a/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
+++ b/llvm/lib/Transforms/IPO/OpenMPOpt.cpp
@@ -161,6 +161,9 @@ struct OMPInformationCache : public InformationCache {
     /// Clear UsesMap for runtime function.
     void clearUsesMap() { UsesMap.clear(); }
 
+    /// Boolean conversion that is true if the runtime function was found.
+    operator bool() const { return Declaration; }
+
     /// Return the vector of uses in function \p F.
     UseVector &getOrCreateUseVector(Function *F) {
       std::shared_ptr<UseVector> &UV = UsesMap[F];
@@ -411,6 +414,9 @@ struct OpenMPOpt {
 
   /// Run all OpenMP optimizations on the underlying SCC/ModuleSlice.
   bool run() {
+    if (SCC.empty())
+      return false;
+
     bool Changed = false;
 
     LLVM_DEBUG(dbgs() << TAG << "Run on SCC with " << SCC.size()