Add lowering for global address nodes. Not pretty efficient though.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70730 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 27 insertions, 1 deletions

diff --git a/lib/Target/MSP430/MSP430ISelLowering.cpp b/lib/Target/MSP430/MSP430ISelLowering.cpp
index ab8be5a..58ca76a 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -65,6 +65,7 @@ MSP430TargetLowering::MSP430TargetLowering(MSP430TargetMachine &tm) :
 
   setOperationAction(ISD::SRA, MVT::i16, Custom);
   setOperationAction(ISD::RET, MVT::Other, Custom);
+  setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
 }
 
 SDValue MSP430TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
@@ -73,6 +74,7 @@ SDValue MSP430TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
   case ISD::SRA:              return LowerShifts(Op, DAG);
   case ISD::RET:              return LowerRET(Op, DAG);
   case ISD::CALL:             return LowerCALL(Op, DAG);
+  case ISD::GlobalAddress:    return LowerGlobalAddress(Op, DAG);
   default:
     assert(0 && "unimplemented operand");
     return SDValue();
@@ -421,11 +423,22 @@ SDValue MSP430TargetLowering::LowerShifts(SDValue Op,
   return Victim;
 }
 
+SDValue MSP430TargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) {
+  const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
+  int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
+
+  // Create the TargetGlobalAddress node, folding in the constant offset.
+  SDValue Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset);
+  return DAG.getNode(MSP430ISD::Wrapper, Op.getDebugLoc(),
+                     getPointerTy(), Result);
+}
+
 const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const {
   switch (Opcode) {
   default: return NULL;
   case MSP430ISD::RET_FLAG:           return "MSP430ISD::RET_FLAG";
   case MSP430ISD::RRA:                return "MSP430ISD::RRA";
   case MSP430ISD::CALL:               return "MSP430ISD::CALL";
+  case MSP430ISD::Wrapper:            return "MSP430ISD::Wrapper";
   }
 }
diff --git a/lib/Target/MSP430/MSP430ISelLowering.h b/lib/Target/MSP430/MSP430ISelLowering.h
index 9e18cb0..a1f03ac 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.h
+++ b/lib/Target/MSP430/MSP430ISelLowering.h
@@ -32,7 +32,11 @@ namespace llvm {
 
       /// CALL/TAILCALL - These operations represent an abstract call
       /// instruction, which includes a bunch of information.
-      CALL
+      CALL,
+
+      /// Wrapper - A wrapper node for TargetConstantPool, TargetExternalSymbol,
+      /// and TargetGlobalAddress.
+      Wrapper
     };
   }
 
@@ -55,6 +59,7 @@ namespace llvm {
     SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
     SDValue LowerCCCArguments(SDValue Op, SelectionDAG &DAG);
     SDValue LowerShifts(SDValue Op, SelectionDAG &DAG);
+    SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
 
     SDValue LowerCCCCallTo(SDValue Op, SelectionDAG &DAG,
                            unsigned CC);
diff --git a/lib/Target/MSP430/MSP430InstrInfo.td b/lib/Target/MSP430/MSP430InstrInfo.td
index 5d3566d..e337b29 100644
--- a/lib/Target/MSP430/MSP430InstrInfo.td
+++ b/lib/Target/MSP430/MSP430InstrInfo.td
@@ -25,6 +25,7 @@ class SDTCisI16<int OpNum> : SDTCisVT<OpNum, i16>;
 def SDT_MSP430Call         : SDTypeProfile<0, -1, [SDTCisVT<0, iPTR>]>;
 def SDT_MSP430CallSeqStart : SDCallSeqStart<[SDTCisVT<0, i16>]>;
 def SDT_MSP430CallSeqEnd   : SDCallSeqEnd<[SDTCisVT<0, i16>, SDTCisVT<1, i16>]>;
+def SDT_MSP430Wrapper      : SDTypeProfile<1, 1, [SDTCisSameAs<0, 1>, SDTCisPtrTy<0>]>;
 
 //===----------------------------------------------------------------------===//
 // MSP430 Specific Node Definitions.
@@ -42,6 +43,7 @@ def MSP430callseq_start :
 def MSP430callseq_end :
                  SDNode<"ISD::CALLSEQ_END",   SDT_MSP430CallSeqEnd,
                         [SDNPHasChain, SDNPOptInFlag, SDNPOutFlag]>;
+def MSP430Wrapper : SDNode<"MSP430ISD::Wrapper",     SDT_MSP430Wrapper>;
 
 //===----------------------------------------------------------------------===//
 // MSP430 Operand Definitions.
@@ -611,6 +613,12 @@ def : Pat<(extloadi16i8 addr:$src), (MOVZX16rm8 addr:$src)>;
 def : Pat<(i8 (trunc GR16:$src)),
           (EXTRACT_SUBREG GR16:$src, subreg_8bit)>;
 
+// GlobalAddress
+def : Pat<(i16 (MSP430Wrapper tglobaladdr :$dst)), (MOV16ri tglobaladdr :$dst)>;
+
+def : Pat<(add GR16:$src1, (MSP430Wrapper tglobaladdr :$src2)),
+          (ADD16ri GR16:$src1, tglobaladdr:$src2)>;
+
 // calls
 def : Pat<(MSP430call (i16 tglobaladdr:$dst)),
           (CALLi tglobaladdr:$dst)>;