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Correctly handle replacement and removal of PHIs with one incoming register.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54374 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2008-08-05 21:40:45 +00:00
parent 021507be82
commit 5d2f8072d4
1 changed files with 7 additions and 1 deletions
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8
lib/CodeGen/UnreachableBlockElim.cpp
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@@ -27,6 +27,7 @@
#include "llvm/Pass.h" #include "llvm/Pass.h"
#include "llvm/Type.h" #include "llvm/Type.h"
#include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CFG.h" #include "llvm/Support/CFG.h"
#include "llvm/Support/Compiler.h" #include "llvm/Support/Compiler.h"
#include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetInstrInfo.h"
@@ -128,10 +129,15 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
start->RemoveOperand(i-1); start->RemoveOperand(i-1);
} }
if (start->getNumOperands() == 1) { if (start->getNumOperands() == 3) {
MachineInstr* phi = start; MachineInstr* phi = start;
unsigned Input = phi->getOperand(1).getReg();
unsigned Output = phi->getOperand(0).getReg();
start++; start++;
phi->eraseFromParent(); phi->eraseFromParent();
F.getRegInfo().replaceRegWith(Output, Input);
} else } else
start++; start++;
} }