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

llvm-svn: 54374
This commit is contained in:
Owen Anderson 2008-08-05 21:40:45 +00:00
parent 182ab758a3
commit bdaed55ef3
1 changed files with 7 additions and 1 deletions
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8
llvm/lib/CodeGen/UnreachableBlockElim.cpp
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@ -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++;
}