make the inliner do less work for leaf functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101846 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/IPO/Inliner.cpp b/lib/Transforms/IPO/Inliner.cpp
index 07918543d40390764d0608c18832c05664640685..6c732d21f28d05229bd0c0d9b7ef25d4feeebc97 100644 (file)
--- a/lib/Transforms/IPO/Inliner.cpp
+++ b/lib/Transforms/IPO/Inliner.cpp
@@ -333,6 +333,10 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
 
   DEBUG(dbgs() << ": " << CallSites.size() << " call sites.\n");
 
+  // If there are no calls in this function, exit early.
+  if (CallSites.empty())
+    return false;
+  
   // Now that we have all of the call sites, move the ones to functions in the
   // current SCC to the end of the list.
   unsigned FirstCallInSCC = CallSites.size();