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| author | Evan Cheng <evan.cheng@apple.com> | 2011-02-21 23:39:48 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2011-02-21 23:39:48 +0000 |
| commit | cf13af6fdee302c2cc8628ae95b40b2bccfdde4b (patch) | |
| tree | d7caa5e0acaf4623ff196459cdc6220eb05da716 /lib/CodeGen/BranchFolding.cpp | |
| parent | d45e8bf93b2024213e423b7b40272da6636e78f7 (diff) | |
| download | llvm-cf13af6fdee302c2cc8628ae95b40b2bccfdde4b.tar.gz llvm-cf13af6fdee302c2cc8628ae95b40b2bccfdde4b.tar.bz2 llvm-cf13af6fdee302c2cc8628ae95b40b2bccfdde4b.tar.xz | |
Add more debugging output.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126158 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | lib/CodeGen/BranchFolding.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index cb81aa3c88..78a87431fe 100644 --- a/lib/CodeGen/BranchFolding.cpp +++ b/lib/CodeGen/BranchFolding.cpp @@ -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())) |