[llvm] r275104 - Codegen: Fix comment in BranchFolding.cpp

[Kyle Butt via llvm-commits]

Author: iteratee
Date: Mon Jul 11 16:37:03 2016
New Revision: 275104

URL: http://llvm.org/viewvc/llvm-project?rev=275104&view=rev
Log:
Codegen: Fix comment in BranchFolding.cpp

Blocks to be tail-merged may share more than one successor. Correct the
comment to state that they share a specific successor, SuccBB, rather
than a single successor, which is not true.

Modified:
    llvm/trunk/lib/CodeGen/BranchFolding.cpp

Modified: llvm/trunk/lib/CodeGen/BranchFolding.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/BranchFolding.cpp?rev=275104&r1=275103&r2=275104&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/BranchFolding.cpp (original)
+++ llvm/trunk/lib/CodeGen/BranchFolding.cpp Mon Jul 11 16:37:03 2016
@@ -816,14 +816,13 @@ mergeMMOsFromMemoryOperations(MachineBas
   }
 }
 
-// See if any of the blocks in MergePotentials (which all have a common single
-// successor, or all have no successor) can be tail-merged.  If there is a
-// successor, any blocks in MergePotentials that are not tail-merged and
-// are not immediately before Succ must have an unconditional branch to
-// Succ added (but the predecessor/successor lists need no adjustment).
-// The lone predecessor of Succ that falls through into Succ,
+// See if any of the blocks in MergePotentials (which all have SuccBB as a
+// successor, or all have no successor if it is null) can be tail-merged.
+// If there is a successor, any blocks in MergePotentials that are not
+// tail-merged and are not immediately before Succ must have an unconditional
+// branch to Succ added (but the predecessor/successor lists need no
+// adjustment). The lone predecessor of Succ that falls through into Succ,
 // if any, is given in PredBB.
-
 bool BranchFolder::TryTailMergeBlocks(MachineBasicBlock *SuccBB,
                                       MachineBasicBlock *PredBB) {
   bool MadeChange = false;