Added a more function PIC16 backend. However to get this working a patch in

ExpandIntegerOperand (LegalizeIntegerTypes.cpp) is needed which is yet to be reworked and submitted. 

llvm-svn: 59617

1 files changed, 22 insertions, 238 deletions

diff --git a/llvm/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp b/llvm/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp
index d98be99f86c..6c2b8ec9747 100644
--- a/llvm/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PIC16/PIC16ISelDAGToDAG.cpp
@@ -13,263 +13,47 @@
 
 #define DEBUG_TYPE "pic16-isel"
 
-#include "PIC16.h"
-#include "PIC16ISelLowering.h"
-#include "PIC16RegisterInfo.h"
-#include "PIC16Subtarget.h"
-#include "PIC16TargetMachine.h"
-#include "llvm/GlobalValue.h"
-#include "llvm/Instructions.h"
-#include "llvm/Intrinsics.h"
-#include "llvm/Type.h"
-#include "llvm/CodeGen/MachineConstantPool.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/SelectionDAGISel.h"
-#include "llvm/Support/CFG.h"
-#include "llvm/Support/Compiler.h"
+#include "PIC16ISelDAGToDAG.h"
 #include "llvm/Support/Debug.h"
-#include "llvm/Target/TargetMachine.h"
-using namespace llvm;
-
-//===----------------------------------------------------------------------===//
-// Instruction Selector Implementation
-//===----------------------------------------------------------------------===//
-
-//===----------------------------------------------------------------------===//
-// PIC16DAGToDAGISel - PIC16 specific code to select PIC16 machine
-// instructions for SelectionDAG operations.
-//===----------------------------------------------------------------------===//
-namespace {
-
-class VISIBILITY_HIDDEN PIC16DAGToDAGISel : public SelectionDAGISel {
-
-  /// TM - Keep a reference to PIC16TargetMachine.
-  PIC16TargetMachine &TM;
 
-public:
-  explicit PIC16DAGToDAGISel(PIC16TargetMachine &tm) : 
-        SelectionDAGISel(*tm.getTargetLowering()),
-        TM(tm) {}
-  
-  virtual void InstructionSelect();
-
-  // Pass Name
-  virtual const char *getPassName() const {
-    return "PIC16 DAG->DAG Pattern Instruction Selection";
-  } 
-  
-private:
-  // Include the pieces autogenerated from the target description.
-#include "PIC16GenDAGISel.inc"
-
-  SDNode *Select(SDValue N);
-
-  // Select addressing mode. currently assume base + offset addr mode.
-  bool SelectAM(SDValue Op, SDValue N, SDValue &Base, SDValue &Offset);
-  bool SelectDirectAM(SDValue Op, SDValue N, SDValue &Base, 
-                      SDValue &Offset);
-  bool StoreInDirectAM(SDValue Op, SDValue N, SDValue &fsr);
-  bool LoadFSR(SDValue Op, SDValue N, SDValue &Base, SDValue &Offset);
-  bool LoadNothing(SDValue Op, SDValue N, SDValue &Base, 
-                   SDValue &Offset);
-
-  // getI8Imm - Return a target constant with the specified
-  // value, of type i8.
-  inline SDValue getI8Imm(unsigned Imm) {
-    return CurDAG->getTargetConstant(Imm, MVT::i8);
-  }
-
-
-#ifndef NDEBUG
-  unsigned Indent;
-#endif
-};
+using namespace llvm;
 
+/// createPIC16ISelDag - This pass converts a legalized DAG into a
+/// PIC16-specific DAG, ready for instruction scheduling.
+FunctionPass *llvm::createPIC16ISelDag(PIC16TargetMachine &TM) {
+  return new PIC16DAGToDAGISel(TM);
 }
 
+
 /// InstructionSelect - This callback is invoked by
 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
-void PIC16DAGToDAGISel::InstructionSelect() 
-{
+void PIC16DAGToDAGISel::InstructionSelect() {
   DEBUG(BB->dump());
-  // Codegen the basic block.
-
-  DOUT << "===== Instruction selection begins:\n";
-#ifndef NDEBUG
-  Indent = 0;
-#endif
-
-  // Select target instructions for the DAG.
   SelectRoot(*CurDAG);
-
-  DOUT << "===== Instruction selection ends:\n";
-
   CurDAG->RemoveDeadNodes();
 }
 
-
-bool PIC16DAGToDAGISel::
-SelectDirectAM (SDValue Op, SDValue N, SDValue &Base, SDValue &Offset)
-{
-  GlobalAddressSDNode *GA;
-  ConstantSDNode      *GC;
-
-  // if Address is FI, get the TargetFrameIndex.
-  if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(N)) {
-    DOUT << "--------- its frame Index\n";
-    Base   = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
-    Offset = CurDAG->getTargetConstant(0, MVT::i32);
-    return true;
-  }
-
-  if (N.getOpcode() == ISD::GlobalAddress) {
-    GA = dyn_cast<GlobalAddressSDNode>(N);
-    Offset = CurDAG->getTargetConstant((unsigned char)GA->getOffset(), MVT::i8);
-    Base = CurDAG->getTargetGlobalAddress(GA->getGlobal(), MVT::i16,
-                                          GA->getOffset());
-    return true;
-  } 
-
-  if (N.getOpcode() == ISD::ADD) {
-    GC = dyn_cast<ConstantSDNode>(N.getOperand(1));
-    Offset = CurDAG->getTargetConstant((unsigned char)GC->getZExtValue(),
-                                       MVT::i8);
-    if ((GA = dyn_cast<GlobalAddressSDNode>(N.getOperand(0)))) {
-      Base = CurDAG->getTargetGlobalAddress(GA->getGlobal(), MVT::i16, 
-                                            GC->getZExtValue());
-      return true;
-    }
-    else if (FrameIndexSDNode *FIN 
-                = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
-      Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
-      return true;
-    }
-  }
-
-  return false;  
-}
-
-
-// FIXME: must also account for preinc/predec/postinc/postdec.
-bool PIC16DAGToDAGISel::
-StoreInDirectAM (SDValue Op, SDValue N, SDValue &fsr)
-{
-  RegisterSDNode *Reg;
-  if (N.getOpcode() == ISD::LOAD) {
-    LoadSDNode *LD = dyn_cast<LoadSDNode>(N);
-    if (LD) {
-      fsr = LD->getBasePtr();
-    }
-    else if (isa<RegisterSDNode>(N.getNode())) { 
-      //FIXME an attempt to retrieve the register number
-      //but does not work
-      DOUT << "this is a register\n";
-      Reg = dyn_cast<RegisterSDNode>(N.getNode());
-      fsr = CurDAG->getRegister(Reg->getReg(),MVT::i16);  
-    }
-    else {
-      DOUT << "this is not a register\n";
-      // FIXME must use whatever load is using
-      fsr = CurDAG->getRegister(1,MVT::i16);
-    }
-    return true;
-  }
-  return false;  
-}
-
-bool PIC16DAGToDAGISel::
-LoadFSR (SDValue Op, SDValue N, SDValue &Base, SDValue &Offset)
-{
-  GlobalAddressSDNode *GA;
-
-  if (N.getOpcode() == ISD::GlobalAddress) {
-    GA = dyn_cast<GlobalAddressSDNode>(N);
-    Offset = CurDAG->getTargetConstant((unsigned char)GA->getOffset(), MVT::i8);
-    Base = CurDAG->getTargetGlobalAddress(GA->getGlobal(), MVT::i16,
-                                          GA->getOffset());
-    return true;
-  }
-  else if (N.getOpcode() == PIC16ISD::Package) {
-    CurDAG->setGraphColor(Op.getNode(), "blue");
-    CurDAG->viewGraph();
-  }
-
-  return false;
-}
-
-// LoadNothing - Don't thake this seriously, it will change.
-bool PIC16DAGToDAGISel::
-LoadNothing (SDValue Op, SDValue N, SDValue &Base, SDValue &Offset)
-{
-  GlobalAddressSDNode *GA;
-  if (N.getOpcode() == ISD::GlobalAddress) {
-    GA = dyn_cast<GlobalAddressSDNode>(N);
-    DOUT << "==========" << GA->getOffset() << "\n";
-    Offset = CurDAG->getTargetConstant((unsigned char)GA->getOffset(), MVT::i8);
-    Base = CurDAG->getTargetGlobalAddress(GA->getGlobal(), MVT::i16,
-                                          GA->getOffset());
-    return true;
-  }  
-
-  return false;
-}
-
-
 /// Select - Select instructions not customized! Used for
 /// expanded, promoted and normal instructions.
-SDNode* PIC16DAGToDAGISel::Select(SDValue N) 
-{
-  SDNode *Node = N.getNode();
-  unsigned Opcode = Node->getOpcode();
-
-  // Dump information about the Node being selected
-#ifndef NDEBUG
-  DOUT << std::string(Indent, ' ') << "Selecting: ";
-  DEBUG(Node->dump(CurDAG));
-  DOUT << "\n";
-  Indent += 2;
-#endif
-
-  // If we have a custom node, we already have selected!
-  if (Node->isMachineOpcode()) {
-#ifndef NDEBUG
-    DOUT << std::string(Indent-2, ' ') << "== ";
-    DEBUG(Node->dump(CurDAG));
-    DOUT << "\n";
-    Indent -= 2;
-#endif
-    return NULL;
-  }
-
-  ///
-  // FIXME: Instruction Selection not handled by custom or by the 
-  // auto-generated tablegen selection should be handled here.
-  /// 
-  switch(Opcode) {
-    default: break;
-  }
+SDNode* PIC16DAGToDAGISel::Select(SDValue N) {
 
   // Select the default instruction.
   SDNode *ResNode = SelectCode(N);
 
-#ifndef NDEBUG
-  DOUT << std::string(Indent-2, ' ') << "=> ";
-  if (ResNode == NULL || ResNode == N.getNode())
-    DEBUG(N.getNode()->dump(CurDAG));
-  else
-    DEBUG(ResNode->dump(CurDAG));
-  DOUT << "\n";
-  Indent -= 2;
-#endif
-
   return ResNode;
 }
 
-/// createPIC16ISelDag - This pass converts a legalized DAG into a 
-/// PIC16-specific DAG, ready for instruction scheduling.
-FunctionPass *llvm::createPIC16ISelDag(PIC16TargetMachine &TM) {
-  return new PIC16DAGToDAGISel(TM);
-}
 
+// SelectDirectAddr - Match a direct address for DAG. 
+// A direct address could be a globaladdress or externalsymbol.
+bool PIC16DAGToDAGISel::SelectDirectAddr(SDValue Op, SDValue N, 
+                                      SDValue &Address) {
+  // Return true if TGA or ES.
+  if (N.getOpcode() == ISD::TargetGlobalAddress
+      || N.getOpcode() == ISD::TargetExternalSymbol) {
+    Address = N;
+    return true;
+  }
+
+  return false;
+}