[X86][MIPS][ARM] New machine instruction property 'isMoveReg'

This property is needed in order to follow values movement between
registers. This property is used in TII to implement method that
returns true if simple copy like instruction is recognized, along
with source and destination machine operands.

Patch by Nikola Prica.

Differential Revision: https://reviews.llvm.org/D45204

llvm-svn: 333093

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/Mips16InstrInfo.cpp b/llvm/lib/Target/Mips/Mips16InstrInfo.cpp
index e11023b4d27..593dafbb9fc 100644
--- a/llvm/lib/Target/Mips/Mips16InstrInfo.cpp
+++ b/llvm/lib/Target/Mips/Mips16InstrInfo.cpp
@@ -97,6 +97,16 @@ void Mips16InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
     MIB.addReg(SrcReg, getKillRegState(KillSrc));
 }
 
+bool Mips16InstrInfo::isCopyInstr(const MachineInstr &MI, MachineOperand &Src,
+                                  MachineOperand &Dest) const {
+  if (MI.isMoveReg()) {
+    Dest = MI.getOperand(0);
+    Src = MI.getOperand(1);
+    return true;
+  }
+  return false;
+}
+
 void Mips16InstrInfo::storeRegToStack(MachineBasicBlock &MBB,
                                       MachineBasicBlock::iterator I,
                                       unsigned SrcReg, bool isKill, int FI,