Add DebugCounters to DivRemPairs

For people who don't use DebugCounters, NFCI.

Patch by Zhizhou Yang!

Differential Revision: https://reviews.llvm.org/D50033

llvm-svn: 338431

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/DivRemPairs.cpp b/llvm/lib/Transforms/Scalar/DivRemPairs.cpp
index e1bc590c5c9..ffcf34f1cf7 100644
--- a/llvm/lib/Transforms/Scalar/DivRemPairs.cpp
+++ b/llvm/lib/Transforms/Scalar/DivRemPairs.cpp
@@ -21,6 +21,7 @@
 #include "llvm/IR/Dominators.h"
 #include "llvm/IR/Function.h"
 #include "llvm/Pass.h"
+#include "llvm/Support/DebugCounter.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/BypassSlowDivision.h"
 using namespace llvm;
@@ -29,6 +30,8 @@ using namespace llvm;
 STATISTIC(NumPairs, "Number of div/rem pairs");
 STATISTIC(NumHoisted, "Number of instructions hoisted");
 STATISTIC(NumDecomposed, "Number of instructions decomposed");
+DEBUG_COUNTER(DRPCounter, "div-rem-pairs-transform",
+              "Controls transformations in div-rem-pairs pass");
 
 /// Find matching pairs of integer div/rem ops (they have the same numerator,
 /// denominator, and signedness). If they exist in different basic blocks, bring
@@ -93,6 +96,9 @@ static bool optimizeDivRem(Function &F, const TargetTransformInfo &TTI,
     if (!DivDominates && !DT.dominates(RemInst, DivInst))
       continue;
 
+    if (!DebugCounter::shouldExecute(DRPCounter))
+      continue;
+
     if (HasDivRemOp) {
       // The target has a single div/rem operation. Hoist the lower instruction
       // to make the matched pair visible to the backend.