diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2009-12-07 03:07:01 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-12-07 03:07:01 +0000 |
| commit | 7e572eb37f1ddb4c9c165354f48692d4cd66affa (patch) | |
| tree | ec0b6b50f03660bdfde3175983df90b8df28eec9 /lib/CodeGen/MachineSSAUpdater.cpp | |
| parent | 6bfcba7e137113e5f38cc4f937ad61cc7253ec74 (diff) | |
If BB is empty, insert PHI before end() instead of front().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90744 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineSSAUpdater.cpp')
| -rw-r--r-- | lib/CodeGen/MachineSSAUpdater.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/CodeGen/MachineSSAUpdater.cpp b/lib/CodeGen/MachineSSAUpdater.cpp index b7711f9f8c..069c3c281f 100644 --- a/lib/CodeGen/MachineSSAUpdater.cpp +++ b/lib/CodeGen/MachineSSAUpdater.cpp @@ -157,8 +157,9 @@ unsigned MachineSSAUpdater::GetValueInMiddleOfBlock(MachineBasicBlock *BB) { return SingularValue; // Otherwise, we do need a PHI: insert one now. + MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->front(); MachineInstr *InsertedPHI = InsertNewDef(TargetInstrInfo::PHI, BB, - BB->front(), VRC, MRI, TII); + Loc, VRC, MRI, TII); // Fill in all the predecessors of the PHI. MachineInstrBuilder MIB(InsertedPHI); @@ -231,7 +232,8 @@ unsigned MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB){ // that we have a cycle. Handle this by inserting a PHI node and returning // it. When we get back to the first instance of the recursion we will fill // in the PHI node. - MachineInstr *NewPHI = InsertNewDef(TargetInstrInfo::PHI, BB, BB->front(), + MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->front(); + MachineInstr *NewPHI = InsertNewDef(TargetInstrInfo::PHI, BB, Loc, VRC, MRI,TII); unsigned NewVR = NewPHI->getOperand(0).getReg(); InsertRes.first->second = NewVR; @@ -311,7 +313,8 @@ unsigned MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB){ // Otherwise, we do need a PHI: insert one now if we don't already have one. MachineInstr *InsertedPHI; if (InsertedVal == 0) { - InsertedPHI = InsertNewDef(TargetInstrInfo::PHI, BB, BB->front(), + MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->front(); + InsertedPHI = InsertNewDef(TargetInstrInfo::PHI, BB, Loc, VRC, MRI, TII); InsertedVal = InsertedPHI->getOperand(0).getReg(); } else { |