Add some basic debug output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105561 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CodePlacementOpt.cpp b/lib/CodeGen/CodePlacementOpt.cpp
index 3ff2a046d233683fc95cebdaa3797e52b4d6e861..e0e315c6c677fdd91fe6be3d0349365d50834bb3 100644 (file)
--- a/lib/CodeGen/CodePlacementOpt.cpp
+++ b/lib/CodeGen/CodePlacementOpt.cpp
@@ -178,6 +178,8 @@ bool CodePlacementOpt::EliminateUnconditionalJumpsToTop(MachineFunction &MF,
         continue;
 
       // Move the block.
+      DEBUG(dbgs() << "CGP: Moving blocks starting at BB#" << Pred->getNumber()
+                   << " to top of loop.\n");
       Changed = true;
 
       // Move it and all the blocks that can reach it via fallthrough edges
@@ -297,6 +299,8 @@ bool CodePlacementOpt::MoveDiscontiguousLoopBlocks(MachineFunction &MF,
         continue;
 
       // Move the block.
+      DEBUG(dbgs() << "CGP: Moving blocks starting at BB#" << BB->getNumber()
+                   << " to be contiguous with loop.\n");
       Changed = true;
 
       // Process this block and all loop blocks contiguous with it, to keep