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Simplify 

llvm-svn: 133798
This commit is contained in:
Rafael Espindola 2011-06-24 15:50:56 +00:00
parent cb0213bda6
commit 5135ae2383
1 changed files with 6 additions and 14 deletions
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20
llvm/lib/CodeGen/TailDuplication.cpp
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@ -97,7 +97,7 @@ namespace {
bool shouldTailDuplicate(const MachineFunction &MF,
bool IsSimple, MachineBasicBlock &TailBB);
bool isSimpleBB(MachineBasicBlock *TailBB);
bool canCompletelyDuplicateBB(MachineBasicBlock &BB, bool IsSimple);
bool canCompletelyDuplicateBB(MachineBasicBlock &BB);
bool duplicateSimpleBB(MachineBasicBlock *TailBB,
SmallVector<MachineBasicBlock*, 8> &TDBBs,
const DenseSet<unsigned> &RegsUsedByPhi,
@ -573,7 +573,7 @@ TailDuplicatePass::shouldTailDuplicate(const MachineFunction &MF,
if (!PreRegAlloc)
return true;
return canCompletelyDuplicateBB(TailBB, IsSimple);
return canCompletelyDuplicateBB(TailBB);
}
/// isSimpleBB - True if this BB has only one unconditional jump.
@ -606,30 +606,22 @@ bothUsedInPHI(const MachineBasicBlock &A,
}
bool
TailDuplicatePass::canCompletelyDuplicateBB(MachineBasicBlock &BB,
bool isSimple) {
TailDuplicatePass::canCompletelyDuplicateBB(MachineBasicBlock &BB) {
SmallPtrSet<MachineBasicBlock*, 8> Succs(BB.succ_begin(), BB.succ_end());
for (MachineBasicBlock::pred_iterator PI = BB.pred_begin(),
PE = BB.pred_end(); PI != PE; ++PI) {
MachineBasicBlock *PredBB = *PI;
if (isSimple) {
if (PredBB->getLandingPadSuccessor())
return false;
if (bothUsedInPHI(*PredBB, Succs))
return false;
} else {
if (PredBB->succ_size() > 1)
return false;
}
if (PredBB->succ_size() > 1)
return false;
MachineBasicBlock *PredTBB = NULL, *PredFBB = NULL;
SmallVector<MachineOperand, 4> PredCond;
if (TII->AnalyzeBranch(*PredBB, PredTBB, PredFBB, PredCond, true))
return false;
if (!isSimple && !PredCond.empty())
if (!PredCond.empty())
return false;
}
return true;