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Add more debugging output. 

llvm-svn: 126158
This commit is contained in:
Evan Cheng 2011-02-21 23:39:48 +00:00
parent 37d5484d18
commit b8ed462ca2
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/CodeGen/BranchFolding.cpp
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@ -501,10 +501,11 @@ static bool ProfitableToMerge(MachineBasicBlock *MBB1,
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 @@ static bool ProfitableToMerge(MachineBasicBlock *MBB1,
// 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()))