[ARM] Mark VSETLNi32 with the InsertSubreg property and implement the related

[oota-llvm.git] / lib / Target / ARM / ARMInstrInfo.cpp

diff --git a/lib/Target/ARM/ARMInstrInfo.cpp b/lib/Target/ARM/ARMInstrInfo.cpp
index 63008853e96bfba0dc7b57452f11dbb6262a336e..5acaa877a3e7ebb55574f36f4bc759d3a692b6c0 100644 (file)
--- a/lib/Target/ARM/ARMInstrInfo.cpp
+++ b/lib/Target/ARM/ARMInstrInfo.cpp
@@ -144,6 +144,29 @@ bool ARMInstrInfo::getExtractSubregLikeInputs(
   llvm_unreachable("Target dependent opcode missing");
 }
 
+bool ARMInstrInfo::getInsertSubregLikeInputs(
+    const MachineInstr &MI, unsigned DefIdx, RegSubRegPair &BaseReg,
+    RegSubRegPairAndIdx &InsertedReg) const {
+  assert(DefIdx < MI.getDesc().getNumDefs() && "Invalid definition index");
+  assert(MI.isInsertSubregLike() && "Invalid kind of instruction");
+
+  switch (MI.getOpcode()) {
+  case ARM::VSETLNi32:
+    // dX = VSETLNi32 dY, rZ, imm
+    const MachineOperand &MOBaseReg = MI.getOperand(1);
+    const MachineOperand &MOInsertedReg = MI.getOperand(2);
+    const MachineOperand &MOIndex = MI.getOperand(3);
+    BaseReg.Reg = MOBaseReg.getReg();
+    BaseReg.SubReg = MOBaseReg.getSubReg();
+
+    InsertedReg.Reg = MOInsertedReg.getReg();
+    InsertedReg.SubReg = MOInsertedReg.getSubReg();
+    InsertedReg.SubIdx = MOIndex.getImm() == 0 ? ARM::ssub_0 : ARM::ssub_1;
+    return true;
+  }
+  llvm_unreachable("Target dependent opcode missing");
+}
+
 namespace {
   /// ARMCGBR - Create Global Base Reg pass. This initializes the PIC
   /// global base register for ARM ELF.