#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();
-
- DOUT << "===== Instruction selection ends:\n";
-
+ SelectRoot(*CurDAG);
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;
+}
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