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Added assertion in getVRegDef of MachineRegisterInfo to make sure the virtual

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register does not have multiple definitions. Modified TwoAddressInstructionPass
to use getUniqueVRegDef instead of getVRegDef.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159545 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2012-07-02 18:55:36 +00:00
parent 49589f0d0e
commit 5f917cd3fa
2 changed files with 8 additions and 5 deletions
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11
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -1536,7 +1536,7 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) {
// Emit a copy or rematerialize the definition.
bool isCopy = false;
const TargetRegisterClass *rc = MRI->getRegClass(regB);
MachineInstr *DefMI = MRI->getVRegDef(regB);
MachineInstr *DefMI = MRI->getUniqueVRegDef(regB);
// If it's safe and profitable, remat the definition instead of
// copying it.
if (DefMI &&
@ -1722,9 +1722,10 @@ TwoAddressInstructionPass::CoalesceExtSubRegs(SmallVector<unsigned,4> &Srcs,
continue;
// Check that the instructions are all in the same basic block.
MachineInstr *SrcDefMI = MRI->getVRegDef(SrcReg);
MachineInstr *DstDefMI = MRI->getVRegDef(DstReg);
if (SrcDefMI->getParent() != DstDefMI->getParent())
MachineInstr *SrcDefMI = MRI->getUniqueVRegDef(SrcReg);
MachineInstr *DstDefMI = MRI->getUniqueVRegDef(DstReg);
if (!SrcDefMI || !DstDefMI ||
SrcDefMI->getParent() != DstDefMI->getParent())
continue;
// If there are no other uses than copies which feed into
@ -1874,7 +1875,7 @@ bool TwoAddressInstructionPass::EliminateRegSequences() {
MachineInstr *DefMI = NULL;
if (!MI->getOperand(i).getSubReg() &&
!TargetRegisterInfo::isPhysicalRegister(SrcReg)) {
DefMI = MRI->getVRegDef(SrcReg);
DefMI = MRI->getUniqueVRegDef(SrcReg);
}
if (DefMI && DefMI->isImplicitDef()) {