Added MachineInstr::isRegTiedToDefOperand to check for two-addressness.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67335 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 7bb6164..cc85b80 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -689,7 +689,7 @@
return -1;
}
-/// isRegReDefinedByTwoAddr - Given the index of a register def operand,
+/// isRegReDefinedByTwoAddr - Given the index of a register operand,
/// check if the register def is a re-definition due to two addr elimination.
bool MachineInstr::isRegReDefinedByTwoAddr(unsigned DefIdx) const{
assert(getOperand(DefIdx).isDef() && "DefIdx is not a def!");
@@ -703,6 +703,24 @@
return false;
}
+/// isRegTiedToDefOperand - Return true if the operand of the specified index
+/// is a register use and it is tied to an def operand. It also returns the def
+/// operand index by reference.
+bool MachineInstr::isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx){
+ const TargetInstrDesc &TID = getDesc();
+ if (UseOpIdx >= TID.getNumOperands())
+ return false;
+ const MachineOperand &MO = getOperand(UseOpIdx);
+ if (!MO.isReg() || !MO.isUse())
+ return false;
+ int DefIdx = TID.getOperandConstraint(UseOpIdx, TOI::TIED_TO);
+ if (DefIdx == -1)
+ return false;
+ if (DefOpIdx)
+ *DefOpIdx = (unsigned)DefIdx;
+ return true;
+}
+
/// copyKillDeadInfo - Copies kill / dead operand properties from MI.
///
void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {