maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Added assertion in getVRegDef of MachineRegisterInfo to make sure the virtual 

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

llvm-svn: 159545
This commit is contained in:
Manman Ren 2012-07-02 18:55:36 +00:00
parent 5da53436d5
commit 72098b2c91
2 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
llvm/lib/CodeGen/MachineRegisterInfo.cpp
View File

@ -162,6 +162,8 @@ void MachineRegisterInfo::replaceRegWith(unsigned FromReg, unsigned ToReg) {
MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
// Since we are in SSA form, we can use the first definition.
def_iterator I = def_begin(Reg);
assert((I.atEnd() || llvm::next(I) == def_end()) &&
"getVRegDef assumes a single definition or no definition");
return !I.atEnd() ? &*I : 0;
}

11
llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
View File

@ -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()) {