1 files changed, 4 insertions, 2 deletions
diff --git a/include/llvm/CodeGen/MachineBranchProbabilityInfo.h b/include/llvm/CodeGen/MachineBranchProbabilityInfo.h
index 39d2f32982..943901f59f 100644
--- a/include/llvm/CodeGen/MachineBranchProbabilityInfo.h
+++ b/include/llvm/CodeGen/MachineBranchProbabilityInfo.h
@@ -34,8 +34,10 @@ class MachineBranchProbabilityInfo : public ImmutablePass {
   // weight to just "inherit" the non-zero weight of an adjacent successor.
   static const uint32_t DEFAULT_WEIGHT = 16;
 
-  // Get sum of the block successors' weights.
-  uint32_t getSumForBlock(MachineBasicBlock *MBB) const;
+  // Get sum of the block successors' weights, potentially scaling them to fit
+  // within 32-bits. If scaling is required, sets Scale based on the necessary
+  // adjustment. Any edge weights used with the sum should be divided by Scale.
+  uint32_t getSumForBlock(MachineBasicBlock *MBB, uint32_t &Scale) const;
 
 public:
   static char ID;