From 75eb53584367098a5625028e22f1ff8e169d0efd 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90759 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/MachineSSAUpdater.cpp | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen/MachineSSAUpdater.cpp') diff --git a/lib/CodeGen/MachineSSAUpdater.cpp b/lib/CodeGen/MachineSSAUpdater.cpp index 069c3c2..f41109e 100644 --- a/lib/CodeGen/MachineSSAUpdater.cpp +++ b/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 v1.1