1 files changed, 9 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
index 75585fcc8026..7d017095c88c 100644
--- a/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
@@ -78,6 +78,7 @@
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Casting.h"
+#include "llvm/Support/DebugCounter.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/Local.h"
@@ -93,6 +94,9 @@ using namespace PatternMatch;
 static const unsigned UnknownAddressSpace =
     std::numeric_limits<unsigned>::max();
 
+DEBUG_COUNTER(StraightLineStrengthReduceCounter, "slsr-counter",
+              "Controls whether rewriteCandidateWithBasis is executed.");
+
 namespace {
 
 class StraightLineStrengthReduceLegacyPass : public FunctionPass {
@@ -268,8 +272,8 @@ FunctionPass *llvm::createStraightLineStrengthReducePass() {
 bool StraightLineStrengthReduce::isBasisFor(const Candidate &Basis,
                                             const Candidate &C) {
   return (Basis.Ins != C.Ins && // skip the same instruction
-          // They must have the same type too. Basis.Base == C.Base doesn't
-          // guarantee their types are the same (PR23975).
+          // They must have the same type too. Basis.Base == C.Base
+          // doesn't guarantee their types are the same (PR23975).
           Basis.Ins->getType() == C.Ins->getType() &&
           // Basis must dominate C in order to rewrite C with respect to Basis.
           DT->dominates(Basis.Ins->getParent(), C.Ins->getParent()) &&
@@ -610,6 +614,9 @@ Value *StraightLineStrengthReduce::emitBump(const Candidate &Basis,
 
 void StraightLineStrengthReduce::rewriteCandidateWithBasis(
     const Candidate &C, const Candidate &Basis) {
+  if (!DebugCounter::shouldExecute(StraightLineStrengthReduceCounter))
+    return;
+
   assert(C.CandidateKind == Basis.CandidateKind && C.Base == Basis.Base &&
          C.Stride == Basis.Stride);
   // We run rewriteCandidateWithBasis on all candidates in a post-order, so the