boscc: process preds only once (#15)

cdl-saarland · Mar 26, 2018 · a59df71 · a59df71
1 parent 6425f4e
commit a59df71
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/transform/bosccTransform.cpp b/src/transform/bosccTransform.cpp
@@ -501,7 +501,9 @@ computeDispersion(RatioMap & dispMap) {
     // join incoming fractions
     bool validRatio = true;
     double ratio = 0.0;
+    SmallPtrSet<const BasicBlock*, 6> seenPreds;
     for (auto * pred : predecessors(block)) {
+      if (!seenPreds.insert(pred).second) continue;
       if (!vecInfo.inRegion(*pred)) {
         continue;
       }