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Differential D143252 Diff 495466 llvm/lib/Target/ARC/ARCOptAddrMode.cpp

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llvm/lib/Target/ARC/ARCOptAddrMode.cpp

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// Return true if \p MI dominates of uses of virtual register \p VReg // Return true if \p MI dominates of uses of virtual register \p VReg
static bool dominatesAllUsesOf(const MachineInstr *MI, unsigned VReg, static bool dominatesAllUsesOf(const MachineInstr *MI, unsigned VReg,
MachineDominatorTree *MDT, MachineDominatorTree *MDT,
MachineRegisterInfo *MRI) { MachineRegisterInfo *MRI) {
assert(Register::isVirtualRegister(VReg) && "Expected virtual register!"); assert(Register::isVirtualRegister(VReg) && "Expected virtual register!");
for (auto it = MRI->use_nodbg_begin(VReg), end = MRI->use_nodbg_end(); for (const MachineOperand &Use : MRI->use_nodbg_operands(VReg)) {
it != end; ++it) { const MachineInstr *User = Use.getParent();
MachineInstr *User = it->getParent();
if (User->isPHI()) { if (User->isPHI()) {
unsigned BBOperandIdx = User->getOperandNo(&*it) + 1; unsigned BBOperandIdx = Use.getOperandNo() + 1;
MachineBasicBlock *MBB = User->getOperand(BBOperandIdx).getMBB(); MachineBasicBlock *MBB = User->getOperand(BBOperandIdx).getMBB();
if (MBB->empty()) { if (MBB->empty()) {
const MachineBasicBlock *InstBB = MI->getParent(); const MachineBasicBlock *InstBB = MI->getParent();
assert(InstBB != MBB && "Instruction found in empty MBB"); assert(InstBB != MBB && "Instruction found in empty MBB");
if (!MDT->dominates(InstBB, MBB)) if (!MDT->dominates(InstBB, MBB))
return false; return false;
continue; continue;
} }
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