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Fix liveness calculation when splitting critical edges during PHI elimination.

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- Edges are split before any phis are eliminated, so the code is SSA.

- Create a proper IR BasicBlock for the split edges.

- LiveVariables::addNewBlock now has same syntax as
  MachineDominatorTree::addNewBlock. Algorithm calculates predecessor live-out
  set rather than successor live-in set.

This feature still causes some miscompilations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86867 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2009-11-11 19:31:31 +00:00
parent eba4ed9cbb
commit 3e20475fee
4 changed files with 83 additions and 55 deletions
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8
include/llvm/CodeGen/LiveVariables.h
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@ -267,9 +267,11 @@ public:
void HandleVirtRegUse(unsigned reg, MachineBasicBlock *MBB,
MachineInstr *MI);
/// addNewBlock - Add a new basic block A as an empty predecessor of B. All
/// variables that are live into B will be marked as passing live through A.
void addNewBlock(MachineBasicBlock *A, MachineBasicBlock *B);
/// addNewBlock - Add a new basic block BB as an empty succcessor to
/// DomBB. All variables that are live out of DomBB will be marked as passing
/// live through BB. This method assumes that the machine code is still in SSA
/// form.
void addNewBlock(MachineBasicBlock *BB, MachineBasicBlock *DomBB);
};
} // End llvm namespace