diff options
| -rw-r--r-- | lib/CodeGen/UnreachableBlockElim.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/CodeGen/UnreachableBlockElim.cpp b/lib/CodeGen/UnreachableBlockElim.cpp index 19341ee721..ca682fd65a 100644 --- a/lib/CodeGen/UnreachableBlockElim.cpp +++ b/lib/CodeGen/UnreachableBlockElim.cpp @@ -27,6 +27,7 @@ #include "llvm/Pass.h" #include "llvm/Type.h" #include "llvm/CodeGen/MachineFunctionPass.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/Support/CFG.h" #include "llvm/Support/Compiler.h" #include "llvm/Target/TargetInstrInfo.h" @@ -128,10 +129,15 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) { start->RemoveOperand(i-1); } - if (start->getNumOperands() == 1) { + if (start->getNumOperands() == 3) { MachineInstr* phi = start; + unsigned Input = phi->getOperand(1).getReg(); + unsigned Output = phi->getOperand(0).getReg(); + start++; phi->eraseFromParent(); + + F.getRegInfo().replaceRegWith(Output, Input); } else start++; } |