C++ (Cpp) MachineInstr::explicit_uses Examples

Example #1

File: WebAssemblyExplicitLocals.cpp Project: mkurdej/llvm

/// Given a MachineOperand of a stackified vreg, return the instruction at the
/// start of the expression tree.
static MachineInstr *FindStartOfTree(MachineOperand &MO,
                                     MachineRegisterInfo &MRI,
                                     WebAssemblyFunctionInfo &MFI) {
  unsigned Reg = MO.getReg();
  assert(MFI.isVRegStackified(Reg));
  MachineInstr *Def = MRI.getVRegDef(Reg);

  // Find the first stackified use and proceed from there.
  for (MachineOperand &DefMO : Def->explicit_uses()) {
    if (!DefMO.isReg())
      continue;
    return FindStartOfTree(DefMO, MRI, MFI);
  }

  // If there were no stackified uses, we've reached the start.
  return Def;
}