[LoopPredication] add some simple stats

Just adding some useful statistics to LoopPredication pass
which was lacking any of these.

llvm-svn: 344681

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopPredication.cpp b/llvm/lib/Transforms/Scalar/LoopPredication.cpp
index cbb6594cf8f..ccaf10142d5 100644
--- a/llvm/lib/Transforms/Scalar/LoopPredication.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopPredication.cpp
@@ -178,6 +178,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Transforms/Scalar/LoopPredication.h"
+#include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/BranchProbabilityInfo.h"
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/LoopPass.h"
@@ -196,6 +197,9 @@
 
 #define DEBUG_TYPE "loop-predication"
 
+STATISTIC(TotalConsidered, "Number of guards considered");
+STATISTIC(TotalWidened, "Number of checks widened");
+
 using namespace llvm;
 
 static cl::opt<bool> EnableIVTruncation("loop-predication-enable-iv-truncation",
@@ -574,6 +578,8 @@ bool LoopPredication::widenGuardConditions(IntrinsicInst *Guard,
   LLVM_DEBUG(dbgs() << "Processing guard:\n");
   LLVM_DEBUG(Guard->dump());
 
+  TotalConsidered++;
+
   IRBuilder<> Builder(cast<Instruction>(Preheader->getTerminator()));
 
   // The guard condition is expected to be in form of:
@@ -615,6 +621,8 @@ bool LoopPredication::widenGuardConditions(IntrinsicInst *Guard,
   if (NumWidened == 0)
     return false;
 
+  TotalWidened += NumWidened;
+
   // Emit the new guard condition
   Builder.SetInsertPoint(Guard);
   Value *LastCheck = nullptr;