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Correctly handle replacement and removal of PHIs with one incoming register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54374 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -27,6 +27,7 @@
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#include "llvm/Pass.h"
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#include "llvm/Pass.h"
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#include "llvm/Type.h"
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#include "llvm/Type.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetInstrInfo.h"
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@ -128,10 +129,15 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
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start->RemoveOperand(i-1);
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start->RemoveOperand(i-1);
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}
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}
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if (start->getNumOperands() == 1) {
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if (start->getNumOperands() == 3) {
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MachineInstr* phi = start;
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MachineInstr* phi = start;
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unsigned Input = phi->getOperand(1).getReg();
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unsigned Output = phi->getOperand(0).getReg();
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start++;
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start++;
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phi->eraseFromParent();
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phi->eraseFromParent();
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F.getRegInfo().replaceRegWith(Output, Input);
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} else
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} else
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start++;
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start++;
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}
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}
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