Allow getBlockFreq to return 0.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135742 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 4 deletions

diff --git a/include/llvm/CodeGen/MachineBlockFrequency.h b/include/llvm/CodeGen/MachineBlockFrequency.h
index 25bf1f08dc..7b43867740 100644
--- a/include/llvm/CodeGen/MachineBlockFrequency.h
+++ b/include/llvm/CodeGen/MachineBlockFrequency.h
@@ -40,11 +40,11 @@ public:
 
   bool runOnMachineFunction(MachineFunction &F);
 
-  /// getblockFreq - Return block frequency. Never return 0, value must be
-  /// positive. Please note that initial frequency is equal to 1024. It means
+  /// getblockFreq - Return block frequency. Return 0 if we don't have the
+  /// information. Please note that initial frequency is equal to 1024. It means
   /// that we should not rely on the value itself, but only on the comparison to
-  /// the other block frequencies. We do this to avoid using of the floating
-  /// points.
+  /// the other block frequencies. We do this to avoid using of floating points.
+  ///
   uint32_t getBlockFreq(MachineBasicBlock *MBB);
 };