[llvm-commits] [llvm] r126158 - /llvm/trunk/lib/CodeGen/BranchFolding.cpp

[Evan Cheng]

Author: evancheng
Date: Mon Feb 21 17:39:48 2011
New Revision: 126158

URL: http://llvm.org/viewvc/llvm-project?rev=126158&view=rev
Log:
Add more debugging output.

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=126158&r1=126157&r2=126158&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/BranchFolding.cpp (original)
+++ llvm/trunk/lib/CodeGen/BranchFolding.cpp Mon Feb 21 17:39:48 2011
@@ -501,10 +501,11 @@
                               MachineBasicBlock *SuccBB,
                               MachineBasicBlock *PredBB) {
   CommonTailLen = ComputeCommonTailLength(MBB1, MBB2, I1, I2);
-  MachineFunction *MF = MBB1->getParent();
-
   if (CommonTailLen == 0)
     return false;
+  DEBUG(dbgs() << "Common tail length of BB#" << MBB1->getNumber()
+               << " and BB#" << MBB2->getNumber() << " is " << CommonTailLen
+               << '\n');
 
   // It's almost always profitable to merge any number of non-terminator
   // instructions with the block that falls through into the common successor.
@@ -541,6 +542,7 @@
   // we don't have to split a block.  At worst we will be introducing 1 new
   // branch instruction, which is likely to be smaller than the 2
   // instructions that would be deleted in the merge.
+  MachineFunction *MF = MBB1->getParent();
   if (EffectiveTailLen >= 2 &&
       MF->getFunction()->hasFnAttr(Attribute::OptimizeForSize) &&
       (I1 == MBB1->begin() || I2 == MBB2->begin()))