Add two statistics to help track how we are computing the inline cost.

Yea, 'NumCallerCallersAnalyzed' isn't a great name, suggestions welcome.

llvm-svn: 154492

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/IPO/Inliner.cpp b/llvm/lib/Transforms/IPO/Inliner.cpp
index 8a9d14977a7..dc9cbfb05e2 100644
--- a/llvm/lib/Transforms/IPO/Inliner.cpp
+++ b/llvm/lib/Transforms/IPO/Inliner.cpp
@@ -36,6 +36,11 @@ STATISTIC(NumCallsDeleted, "Number of call sites deleted, not inlined");
 STATISTIC(NumDeleted, "Number of functions deleted because all callers found");
 STATISTIC(NumMergedAllocas, "Number of allocas merged together");
 
+// This weirdly named statistic tracks the number of times that, when attemting
+// to inline a function A into B, we analyze the callers of B in order to see
+// if those would be more profitable and blocked inline steps.
+STATISTIC(NumCallerCallersAnalyzed, "Number of caller-callers analyzed");
+
 static cl::opt<int>
 InlineLimit("inline-threshold", cl::Hidden, cl::init(225), cl::ZeroOrMore,
         cl::desc("Control the amount of inlining to perform (default = 225)"));
@@ -277,6 +282,7 @@ bool Inliner::shouldInline(CallSite CS) {
       }
 
       InlineCost IC2 = getInlineCost(CS2);
+      ++NumCallerCallersAnalyzed;
       if (!IC2) {
         callerWillBeRemoved = false;
         continue;