From cc7706219477dde6f91213b73af123c0ed95eb7c Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Mon, 7 Dec 2009 10:15:19 +0000 Subject: Pre-regalloc tale duplication. Work in progress. llvm-svn: 90759 --- llvm/lib/CodeGen/MachineSSAUpdater.cpp | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'llvm/lib/CodeGen/MachineSSAUpdater.cpp') diff --git a/llvm/lib/CodeGen/MachineSSAUpdater.cpp b/llvm/lib/CodeGen/MachineSSAUpdater.cpp index 069c3c281f8..f41109e80cf 100644 --- a/llvm/lib/CodeGen/MachineSSAUpdater.cpp +++ b/llvm/lib/CodeGen/MachineSSAUpdater.cpp @@ -207,6 +207,16 @@ void MachineSSAUpdater::RewriteUse(MachineOperand &U) { U.setReg(NewVR); } +void MachineSSAUpdater::ReplaceRegWith(unsigned OldReg, unsigned NewReg) { + MRI->replaceRegWith(OldReg, NewReg); + + AvailableValsTy &AvailableVals = getAvailableVals(AV); + for (DenseMap::iterator + I = AvailableVals.begin(), E = AvailableVals.end(); I != E; ++I) + if (I->second == OldReg) + I->second = NewReg; +} + /// GetValueAtEndOfBlockInternal - Check to see if AvailableVals has an entry /// for the specified BB and if so, return it. If not, construct SSA form by /// walking predecessors inserting PHI nodes as needed until we get to a block @@ -297,7 +307,7 @@ unsigned MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB){ MachineInstr *OldVal = MRI->getVRegDef(InsertedVal); // Be careful about dead loops. These RAUW's also update InsertedVal. assert(InsertedVal != SingularValue && "Dead loop?"); - MRI->replaceRegWith(InsertedVal, SingularValue); + ReplaceRegWith(InsertedVal, SingularValue); OldVal->eraseFromParent(); } -- cgit v1.2.3