--- /dev/null
+//===-- PPC32ISelPattern.cpp - A pattern matching inst selector for PPC32 -===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a pattern matching instruction selector for 32 bit PowerPC.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PowerPC.h"
+#include "PowerPCInstrBuilder.h"
+#include "PowerPCInstrInfo.h"
+#include "PPC32RegisterInfo.h"
+#include "llvm/Constants.h" // FIXME: REMOVE
+#include "llvm/Function.h"
+#include "llvm/CodeGen/MachineConstantPool.h" // FIXME: REMOVE
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/CodeGen/SSARegMap.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/ADT/Statistic.h"
+#include <set>
+#include <algorithm>
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+// PPC32TargetLowering - PPC32 Implementation of the TargetLowering interface
+namespace {
+ class PPC32TargetLowering : public TargetLowering {
+ int VarArgsFrameIndex; // FrameIndex for start of varargs area.
+ int ReturnAddrIndex; // FrameIndex for return slot.
+ public:
+ PPC32TargetLowering(TargetMachine &TM) : TargetLowering(TM) {
+ // Set up the TargetLowering object.
+
+ // Set up the register classes.
+ addRegisterClass(MVT::i32, PPC32::GPRCRegisterClass);
+ addRegisterClass(MVT::f32, PPC32::GPRCRegisterClass);
+ addRegisterClass(MVT::f64, PPC32::FPRCRegisterClass);
+
+ computeRegisterProperties();
+ }
+
+ /// LowerArguments - This hook must be implemented to indicate how we should
+ /// lower the arguments for the specified function, into the specified DAG.
+ virtual std::vector<SDOperand>
+ LowerArguments(Function &F, SelectionDAG &DAG);
+
+ /// LowerCallTo - This hook lowers an abstract call to a function into an
+ /// actual call.
+ virtual std::pair<SDOperand, SDOperand>
+ LowerCallTo(SDOperand Chain, const Type *RetTy, SDOperand Callee,
+ ArgListTy &Args, SelectionDAG &DAG);
+
+ virtual std::pair<SDOperand, SDOperand>
+ LowerVAStart(SDOperand Chain, SelectionDAG &DAG);
+
+ virtual std::pair<SDOperand,SDOperand>
+ LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
+ const Type *ArgTy, SelectionDAG &DAG);
+
+ virtual std::pair<SDOperand, SDOperand>
+ LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
+ SelectionDAG &DAG);
+ };
+}
+
+
+std::vector<SDOperand>
+PPC32TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
+ //
+ // add beautiful description of PPC stack frame format, or at least some docs
+ //
+ MachineFunction &MF = DAG.getMachineFunction();
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+ MachineBasicBlock& BB = MF.front();
+ std::vector<SDOperand> ArgValues;
+
+ // Due to the rather complicated nature of the PowerPC ABI, rather than a
+ // fixed size array of physical args, for the sake of simplicity let the STL
+ // handle tracking them for us.
+ std::vector<unsigned> argVR, argPR, argOp;
+ unsigned ArgOffset = 24;
+ unsigned GPR_remaining = 8;
+ unsigned FPR_remaining = 13;
+ unsigned GPR_idx = 0, FPR_idx = 0;
+ static const unsigned GPR[] = {
+ PPC::R3, PPC::R4, PPC::R5, PPC::R6,
+ PPC::R7, PPC::R8, PPC::R9, PPC::R10,
+ };
+ static const unsigned FPR[] = {
+ PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
+ PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
+ };
+
+ // Add DAG nodes to load the arguments... On entry to a function on PPC,
+ // the arguments start at offset 24, although they are likely to be passed
+ // in registers.
+ for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
+ SDOperand newroot, argt;
+ unsigned ObjSize;
+ bool needsLoad = false;
+ MVT::ValueType ObjectVT = getValueType(I->getType());
+
+ switch (ObjectVT) {
+ default: assert(0 && "Unhandled argument type!");
+ case MVT::i1:
+ case MVT::i8:
+ case MVT::i16:
+ case MVT::i32:
+ ObjSize = 4;
+ if (GPR_remaining > 0) {
+ BuildMI(&BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
+ unsigned virtReg =
+ MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i32));
+ argt = newroot = DAG.getCopyFromReg(virtReg, MVT::i32, DAG.getRoot());
+ if (ObjectVT != MVT::i32)
+ argt = DAG.getNode(ISD::TRUNCATE, ObjectVT, newroot);
+ argVR.push_back(virtReg);
+ argPR.push_back(GPR[GPR_idx]);
+ argOp.push_back(PPC::OR);
+ } else {
+ needsLoad = true;
+ }
+ break;
+ case MVT::i64: ObjSize = 8;
+ if (GPR_remaining > 1) {
+ BuildMI(&BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
+ BuildMI(&BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx+1]);
+ MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i32));
+ unsigned virtReg =
+ MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i32))-1;
+ // FIXME: is this correct?
+ argt = newroot = DAG.getCopyFromReg(virtReg, MVT::i32, DAG.getRoot());
+ argt = DAG.getCopyFromReg(virtReg+1, MVT::i32, newroot);
+ // Push the arguments for emitting into BB later
+ argVR.push_back(virtReg); argVR.push_back(virtReg+1);
+ argPR.push_back(GPR[GPR_idx]); argPR.push_back(GPR[GPR_idx+1]);
+ argOp.push_back(PPC::OR); argOp.push_back(PPC::OR);
+ } else {
+ needsLoad = true;
+ }
+ break;
+ case MVT::f32: ObjSize = 4;
+ case MVT::f64: ObjSize = 8;
+ if (FPR_remaining > 0) {
+ BuildMI(&BB, PPC::IMPLICIT_DEF, 0, FPR[FPR_idx]);
+ unsigned virtReg =
+ MF.getSSARegMap()->createVirtualRegister(getRegClassFor(ObjectVT));
+ argt = newroot = DAG.getCopyFromReg(virtReg, ObjectVT, DAG.getRoot());
+ argVR.push_back(virtReg);
+ argPR.push_back(FPR[FPR_idx]);
+ argOp.push_back(PPC::FMR);
+ --FPR_remaining;
+ ++FPR_idx;
+ } else {
+ needsLoad = true;
+ }
+ break;
+ }
+
+ // We need to load the argument to a virtual register if we determined above
+ // that we ran out of physical registers of the appropriate type
+ if (needsLoad) {
+ int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
+ SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
+ argt = newroot = DAG.getLoad(ObjectVT, DAG.getEntryNode(), FIN);
+ }
+
+ // Every 4 bytes of argument space consumes one of the GPRs available for
+ // argument passing.
+ if (GPR_remaining > 0) {
+ unsigned delta = (GPR_remaining > 1 && ObjSize == 8) ? 2 : 1;
+ GPR_remaining -= delta;
+ GPR_idx += delta;
+ }
+ ArgOffset += ObjSize;
+
+ DAG.setRoot(newroot.getValue(1));
+ ArgValues.push_back(argt);
+ }
+
+ for (int i = 0, count = argVR.size(); i < count; ++i) {
+ if (argOp[i] == PPC::FMR)
+ BuildMI(&BB, argOp[i], 1, argVR[i]).addReg(argPR[i]);
+ else
+ BuildMI(&BB, argOp[i], 2, argVR[i]).addReg(argPR[i]).addReg(argPR[i]);
+ }
+
+ // If the function takes variable number of arguments, make a frame index for
+ // the start of the first vararg value... for expansion of llvm.va_start.
+ if (F.isVarArg())
+ VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
+
+ return ArgValues;
+}
+
+std::pair<SDOperand, SDOperand>
+PPC32TargetLowering::LowerCallTo(SDOperand Chain,
+ const Type *RetTy, SDOperand Callee,
+ ArgListTy &Args, SelectionDAG &DAG) {
+ // FIXME
+ int NumBytes = 56;
+
+ Chain = DAG.getNode(ISD::ADJCALLSTACKDOWN, MVT::Other, Chain,
+ DAG.getConstant(NumBytes, getPointerTy()));
+ std::vector<SDOperand> args_to_use;
+ for (unsigned i = 0, e = Args.size(); i != e; ++i)
+ {
+ switch (getValueType(Args[i].second)) {
+ default: assert(0 && "Unexpected ValueType for argument!");
+ case MVT::i1:
+ case MVT::i8:
+ case MVT::i16:
+ case MVT::i32:
+ case MVT::i64:
+ case MVT::f64:
+ case MVT::f32:
+ break;
+ }
+ args_to_use.push_back(Args[i].first);
+ }
+
+ std::vector<MVT::ValueType> RetVals;
+ MVT::ValueType RetTyVT = getValueType(RetTy);
+ if (RetTyVT != MVT::isVoid)
+ RetVals.push_back(RetTyVT);
+ RetVals.push_back(MVT::Other);
+
+ SDOperand TheCall = SDOperand(DAG.getCall(RetVals,
+ Chain, Callee, args_to_use), 0);
+ Chain = TheCall.getValue(RetTyVT != MVT::isVoid);
+ Chain = DAG.getNode(ISD::ADJCALLSTACKUP, MVT::Other, Chain,
+ DAG.getConstant(NumBytes, getPointerTy()));
+ return std::make_pair(TheCall, Chain);
+}
+
+std::pair<SDOperand, SDOperand>
+PPC32TargetLowering::LowerVAStart(SDOperand Chain, SelectionDAG &DAG) {
+ //vastart just returns the address of the VarArgsFrameIndex slot.
+ return std::make_pair(DAG.getFrameIndex(VarArgsFrameIndex, MVT::i32), Chain);
+}
+
+std::pair<SDOperand,SDOperand> PPC32TargetLowering::
+LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
+ const Type *ArgTy, SelectionDAG &DAG) {
+ abort();
+}
+
+
+std::pair<SDOperand, SDOperand> PPC32TargetLowering::
+LowerFrameReturnAddress(bool isFrameAddress, SDOperand Chain, unsigned Depth,
+ SelectionDAG &DAG) {
+ abort();
+}
+
+namespace {
+
+//===--------------------------------------------------------------------===//
+/// ISel - PPC32 specific code to select PPC32 machine instructions for
+/// SelectionDAG operations.
+//===--------------------------------------------------------------------===//
+class ISel : public SelectionDAGISel {
+
+ /// Comment Here.
+ PPC32TargetLowering PPC32Lowering;
+
+ /// ExprMap - As shared expressions are codegen'd, we keep track of which
+ /// vreg the value is produced in, so we only emit one copy of each compiled
+ /// tree.
+ std::map<SDOperand, unsigned> ExprMap;
+
+public:
+ ISel(TargetMachine &TM) : SelectionDAGISel(PPC32Lowering), PPC32Lowering(TM)
+ {}
+
+ /// InstructionSelectBasicBlock - This callback is invoked by
+ /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
+ virtual void InstructionSelectBasicBlock(SelectionDAG &DAG) {
+ DEBUG(BB->dump());
+ // Codegen the basic block.
+ Select(DAG.getRoot());
+
+ // Clear state used for selection.
+ ExprMap.clear();
+ }
+
+ unsigned SelectExpr(SDOperand N);
+ unsigned SelectExprFP(SDOperand N, unsigned Result);
+ void Select(SDOperand N);
+
+ void SelectAddr(SDOperand N, unsigned& Reg, int& offset);
+ void SelectBranchCC(SDOperand N);
+};
+
+/// canUseAsImmediateForOpcode - This method returns a value indicating whether
+/// the ConstantSDNode N can be used as an immediate to Opcode. The return
+/// values are either 0, 1 or 2. 0 indicates that either N is not a
+/// ConstantSDNode, or is not suitable for use by that opcode. A return value
+/// of 1 indicates that the constant may be used in normal immediate form. A
+/// return value of 2 indicates that the constant may be used in shifted
+/// immediate form. If the return value is nonzero, the constant value is
+/// placed in Imm.
+///
+static unsigned canUseAsImmediateForOpcode(SDOperand N, unsigned Opcode,
+ unsigned& Imm) {
+ if (N.getOpcode() != ISD::Constant) return 0;
+
+ int v = (int)cast<ConstantSDNode>(N)->getSignExtended();
+
+ switch(Opcode) {
+ default: return 0;
+ case ISD::ADD:
+ if (v <= 32767 && v >= -32768) { Imm = v & 0xFFFF; return 1; }
+ if ((v & 0x0000FFFF) == 0) { Imm = v >> 16; return 2; }
+ break;
+ case ISD::AND:
+ case ISD::XOR:
+ case ISD::OR:
+ if (v >= 0 && v <= 65535) { Imm = v & 0xFFFF; return 1; }
+ if ((v & 0x0000FFFF) == 0) { Imm = v >> 16; return 2; }
+ break;
+ }
+ return 0;
+}
+}
+
+//Check to see if the load is a constant offset from a base register
+void ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
+{
+ Reg = SelectExpr(N);
+ offset = 0;
+ return;
+}
+
+void ISel::SelectBranchCC(SDOperand N)
+{
+ assert(N.getOpcode() == ISD::BRCOND && "Not a BranchCC???");
+ MachineBasicBlock *Dest =
+ cast<BasicBlockSDNode>(N.getOperand(2))->getBasicBlock();
+ unsigned Opc;
+
+ Select(N.getOperand(0)); //chain
+ SDOperand CC = N.getOperand(1);
+
+ //Giveup and do the stupid thing
+ unsigned Tmp1 = SelectExpr(CC);
+ BuildMI(BB, PPC::BNE, 2).addReg(Tmp1).addMBB(Dest);
+ return;
+}
+
+unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
+{
+ unsigned Tmp1, Tmp2, Tmp3;
+ unsigned Opc = 0;
+ SDNode *Node = N.Val;
+ MVT::ValueType DestType = N.getValueType();
+ unsigned opcode = N.getOpcode();
+
+ switch (opcode) {
+ default:
+ Node->dump();
+ assert(0 && "Node not handled!\n");
+
+ case ISD::SELECT:
+ abort();
+
+ case ISD::FP_ROUND:
+ assert (DestType == MVT::f32 &&
+ N.getOperand(0).getValueType() == MVT::f64 &&
+ "only f64 to f32 conversion supported here");
+ Tmp1 = SelectExpr(N.getOperand(0));
+ BuildMI(BB, PPC::FRSP, 1, Result).addReg(Tmp1);
+ return Result;
+
+ case ISD::FP_EXTEND:
+ assert (DestType == MVT::f64 &&
+ N.getOperand(0).getValueType() == MVT::f32 &&
+ "only f32 to f64 conversion supported here");
+ Tmp1 = SelectExpr(N.getOperand(0));
+ BuildMI(BB, PPC::FMR, 1, Result).addReg(Tmp1);
+ return Result;
+
+ case ISD::CopyFromReg:
+ // FIXME: Handle copy from physregs!
+ // Just use the specified register as our input.
+ return dyn_cast<RegSDNode>(Node)->getReg();
+
+ case ISD::LOAD:
+ abort();
+
+ case ISD::ConstantFP:
+ abort();
+
+ case ISD::MUL:
+ case ISD::ADD:
+ case ISD::SUB:
+ case ISD::SDIV:
+ switch( opcode ) {
+ case ISD::MUL: Opc = DestType == MVT::f64 ? PPC::FMUL : PPC::FMULS; break;
+ case ISD::ADD: Opc = DestType == MVT::f64 ? PPC::FADD : PPC::FADDS; break;
+ case ISD::SUB: Opc = DestType == MVT::f64 ? PPC::FSUB : PPC::FSUBS; break;
+ case ISD::SDIV: Opc = DestType == MVT::f64 ? PPC::FDIV : PPC::FDIVS; break;
+ };
+
+ Tmp1 = SelectExpr(N.getOperand(0));
+ Tmp2 = SelectExpr(N.getOperand(1));
+ BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
+ return Result;
+
+ case ISD::EXTLOAD:
+ abort();
+
+ case ISD::UINT_TO_FP:
+ case ISD::SINT_TO_FP:
+ abort();
+ }
+ assert(0 && "should not get here");
+ return 0;
+}
+
+unsigned ISel::SelectExpr(SDOperand N) {
+ unsigned Result;
+ unsigned Tmp1, Tmp2, Tmp3;
+ unsigned Opc = 0;
+ unsigned opcode = N.getOpcode();
+
+ SDNode *Node = N.Val;
+ MVT::ValueType DestType = N.getValueType();
+
+ unsigned &Reg = ExprMap[N];
+ if (Reg) return Reg;
+
+ if (DestType == MVT::f64 || DestType == MVT::f32)
+ return SelectExprFP(N, Result);
+
+ if (N.getOpcode() != ISD::CALL)
+ Reg = Result = (N.getValueType() != MVT::Other) ?
+ MakeReg(N.getValueType()) : 1;
+ else
+ abort(); // FIXME: Implement Call
+
+ switch (opcode) {
+ default:
+ Node->dump();
+ assert(0 && "Node not handled!\n");
+
+ case ISD::DYNAMIC_STACKALLOC:
+ abort();
+
+ case ISD::ConstantPool:
+ abort();
+
+ case ISD::FrameIndex:
+ abort();
+
+ case ISD::EXTLOAD:
+ case ISD::ZEXTLOAD:
+ case ISD::SEXTLOAD:
+ case ISD::LOAD:
+ case ISD::GlobalAddress:
+ case ISD::CALL:
+ abort();
+
+ case ISD::SIGN_EXTEND:
+ case ISD::SIGN_EXTEND_INREG:
+ Tmp1 = SelectExpr(N.getOperand(0));
+ BuildMI(BB, PPC::EXTSH, 1, Result).addReg(Tmp1);
+ return Result;
+
+ case ISD::ZERO_EXTEND_INREG:
+ Tmp1 = SelectExpr(N.getOperand(0));
+ switch(cast<MVTSDNode>(Node)->getExtraValueType()) {
+ default:
+ Node->dump();
+ assert(0 && "Zero Extend InReg not there yet");
+ break;
+ case MVT::i16: Tmp2 = 16; break;
+ case MVT::i8: Tmp2 = 24; break;
+ case MVT::i1: Tmp2 = 31; break;
+ }
+ BuildMI(BB, PPC::RLWINM, 5, Result).addReg(Tmp1).addImm(0).addImm(0)
+ .addImm(Tmp2).addImm(31);
+ return Result;
+
+ case ISD::SETCC:
+ abort();
+
+ case ISD::CopyFromReg:
+ if (Result == 1)
+ Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
+ Tmp1 = dyn_cast<RegSDNode>(Node)->getReg();
+ BuildMI(BB, PPC::OR, 2, Result).addReg(Tmp1).addReg(Tmp1);
+ return Result;
+
+ case ISD::SHL:
+ case ISD::SRL:
+ case ISD::SRA:
+ case ISD::MUL:
+ abort();
+
+ case ISD::ADD:
+ assert (DestType == MVT::i32 && "Only do arithmetic on i32s!");
+ Tmp1 = SelectExpr(N.getOperand(0));
+ switch(canUseAsImmediateForOpcode(N.getOperand(1), opcode, Tmp2)) {
+ default: assert(0 && "unhandled result code");
+ case 0: // No immediate
+ Tmp2 = SelectExpr(N.getOperand(1));
+ BuildMI(BB, PPC::ADD, 2, Result).addReg(Tmp1).addReg(Tmp2);
+ break;
+ case 1: // Low immediate
+ BuildMI(BB, PPC::ADDI, 2, Result).addReg(Tmp1).addSImm(Tmp2);
+ break;
+ case 2: // Shifted immediate
+ BuildMI(BB, PPC::ADDIS, 2, Result).addReg(Tmp1).addSImm(Tmp2);
+ break;
+ }
+ return Result;
+
+ case ISD::SUB:
+ abort();
+
+ case ISD::AND:
+ case ISD::OR:
+ case ISD::XOR:
+ assert (DestType == MVT::i32 && "Only do arithmetic on i32s!");
+ Tmp1 = SelectExpr(N.getOperand(0));
+ switch(canUseAsImmediateForOpcode(N.getOperand(1), opcode, Tmp2)) {
+ default: assert(0 && "unhandled result code");
+ case 0: // No immediate
+ Tmp2 = SelectExpr(N.getOperand(1));
+ switch (opcode) {
+ case ISD::AND: Tmp3 = PPC::AND; break;
+ case ISD::OR: Tmp3 = PPC::OR; break;
+ case ISD::XOR: Tmp3 = PPC::XOR; break;
+ }
+ BuildMI(BB, Tmp3, 2, Result).addReg(Tmp1).addReg(Tmp2);
+ break;
+ case 1: // Low immediate
+ switch (opcode) {
+ case ISD::AND: Tmp3 = PPC::ANDIo; break;
+ case ISD::OR: Tmp3 = PPC::ORI; break;
+ case ISD::XOR: Tmp3 = PPC::XORI; break;
+ }
+ BuildMI(BB, Tmp3, 2, Result).addReg(Tmp1).addImm(Tmp2);
+ break;
+ case 2: // Shifted immediate
+ switch (opcode) {
+ case ISD::AND: Tmp3 = PPC::ANDISo; break;
+ case ISD::OR: Tmp3 = PPC::ORIS; break;
+ case ISD::XOR: Tmp3 = PPC::XORIS; break;
+ }
+ BuildMI(BB, Tmp3, 2, Result).addReg(Tmp1).addImm(Tmp2);
+ break;
+ }
+ return Result;
+
+ case ISD::UREM:
+ case ISD::SREM:
+ case ISD::SDIV:
+ case ISD::UDIV:
+ abort();
+
+ case ISD::FP_TO_UINT:
+ case ISD::FP_TO_SINT:
+ abort();
+
+ case ISD::SELECT:
+ abort();
+
+ case ISD::Constant:
+ switch (N.getValueType()) {
+ default: assert(0 && "Cannot use constants of this type!");
+ case MVT::i1:
+ BuildMI(BB, PPC::LI, 1, Result)
+ .addSImm(!cast<ConstantSDNode>(N)->isNullValue());
+ break;
+ case MVT::i32:
+ {
+ int v = (int)cast<ConstantSDNode>(N)->getSignExtended();
+ if (v < 32768 && v >= -32768) {
+ BuildMI(BB, PPC::LI, 1, Result).addSImm(v);
+ } else {
+ unsigned Temp = MakeReg(MVT::i32);
+ BuildMI(BB, PPC::LIS, 1, Temp).addSImm(v >> 16);
+ BuildMI(BB, PPC::ORI, 2, Result).addReg(Temp).addImm(v & 0xFFFF);
+ }
+ }
+ }
+ return Result;
+ }
+
+ return 0;
+}
+
+void ISel::Select(SDOperand N) {
+ unsigned Tmp1, Tmp2, Opc;
+ unsigned opcode = N.getOpcode();
+
+ if (!ExprMap.insert(std::make_pair(N, 1)).second)
+ return; // Already selected.
+
+ SDNode *Node = N.Val;
+
+ switch (Node->getOpcode()) {
+ default:
+ Node->dump(); std::cerr << "\n";
+ assert(0 && "Node not handled yet!");
+ case ISD::EntryToken: return; // Noop
+ case ISD::TokenFactor:
+ for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
+ Select(Node->getOperand(i));
+ return;
+ case ISD::ADJCALLSTACKDOWN:
+ case ISD::ADJCALLSTACKUP:
+ Select(N.getOperand(0));
+ Tmp1 = cast<ConstantSDNode>(N.getOperand(1))->getValue();
+ Opc = N.getOpcode() == ISD::ADJCALLSTACKDOWN ? PPC::ADJCALLSTACKDOWN :
+ PPC::ADJCALLSTACKUP;
+ BuildMI(BB, Opc, 1).addImm(Tmp1);
+ return;
+ case ISD::BR: {
+ MachineBasicBlock *Dest =
+ cast<BasicBlockSDNode>(N.getOperand(1))->getBasicBlock();
+
+ Select(N.getOperand(0));
+ BuildMI(BB, PPC::B, 1).addMBB(Dest);
+ return;
+ }
+ case ISD::BRCOND:
+ SelectBranchCC(N);
+ return;
+ case ISD::CopyToReg:
+ Select(N.getOperand(0));
+ Tmp1 = SelectExpr(N.getOperand(1));
+ Tmp2 = cast<RegSDNode>(N)->getReg();
+
+ if (Tmp1 != Tmp2) {
+ if (N.getOperand(1).getValueType() == MVT::f64 ||
+ N.getOperand(1).getValueType() == MVT::f32)
+ BuildMI(BB, PPC::FMR, 1, Tmp2).addReg(Tmp1);
+ else
+ BuildMI(BB, PPC::OR, 2, Tmp2).addReg(Tmp1).addReg(Tmp1);
+ }
+ return;
+ case ISD::ImplicitDef:
+ Select(N.getOperand(0));
+ BuildMI(BB, PPC::IMPLICIT_DEF, 0, cast<RegSDNode>(N)->getReg());
+ return;
+ case ISD::RET:
+ switch (N.getNumOperands()) {
+ default:
+ assert(0 && "Unknown return instruction!");
+ case 3:
+ assert(N.getOperand(1).getValueType() == MVT::i32 &&
+ N.getOperand(2).getValueType() == MVT::i32 &&
+ "Unknown two-register value!");
+ Select(N.getOperand(0));
+ Tmp1 = SelectExpr(N.getOperand(1));
+ Tmp2 = SelectExpr(N.getOperand(2));
+ BuildMI(BB, PPC::OR, 2, PPC::R3).addReg(Tmp1).addReg(Tmp1);
+ BuildMI(BB, PPC::OR, 2, PPC::R4).addReg(Tmp2).addReg(Tmp2);
+ break;
+ case 2:
+ Select(N.getOperand(0));
+ Tmp1 = SelectExpr(N.getOperand(1));
+ switch (N.getOperand(1).getValueType()) {
+ default:
+ assert(0 && "Unknown return type!");
+ case MVT::f64:
+ case MVT::f32:
+ BuildMI(BB, PPC::FMR, 1, PPC::F1).addReg(Tmp1);
+ break;
+ case MVT::i32:
+ BuildMI(BB, PPC::OR, 2, PPC::R3).addReg(Tmp1).addReg(Tmp1);
+ break;
+ }
+ }
+ BuildMI(BB, PPC::BLR, 0); // Just emit a 'ret' instruction
+ return;
+
+ case ISD::TRUNCSTORE:
+ case ISD::STORE:
+ {
+ SDOperand Chain = N.getOperand(0);
+ SDOperand Value = N.getOperand(1);
+ SDOperand Address = N.getOperand(2);
+ Select(Chain);
+
+ Tmp1 = SelectExpr(Value); //value
+
+ if (opcode == ISD::STORE) {
+ switch(Value.getValueType()) {
+ default: assert(0 && "unknown Type in store");
+ case MVT::i32: Opc = PPC::STW; break;
+ case MVT::f64: Opc = PPC::STFD; break;
+ case MVT::f32: Opc = PPC::STFS; break;
+ }
+ } else { //ISD::TRUNCSTORE
+ switch(cast<MVTSDNode>(Node)->getExtraValueType()) {
+ default: assert(0 && "unknown Type in store");
+ case MVT::i1: //FIXME: DAG does not promote this load
+ case MVT::i8: Opc = PPC::STB; break;
+ case MVT::i16: Opc = PPC::STH; break;
+ }
+ }
+
+ if (Address.getOpcode() == ISD::GlobalAddress)
+ {
+ BuildMI(BB, Opc, 2).addReg(Tmp1)
+ .addGlobalAddress(cast<GlobalAddressSDNode>(Address)->getGlobal());
+ }
+ else if(Address.getOpcode() == ISD::FrameIndex)
+ {
+ BuildMI(BB, Opc, 2).addReg(Tmp1)
+ .addFrameIndex(cast<FrameIndexSDNode>(Address)->getIndex());
+ }
+ else
+ {
+ int offset;
+ SelectAddr(Address, Tmp2, offset);
+ BuildMI(BB, Opc, 3).addReg(Tmp1).addImm(offset).addReg(Tmp2);
+ }
+ return;
+ }
+ case ISD::EXTLOAD:
+ case ISD::SEXTLOAD:
+ case ISD::ZEXTLOAD:
+ case ISD::LOAD:
+ case ISD::CopyFromReg:
+ case ISD::CALL:
+ case ISD::DYNAMIC_STACKALLOC:
+ ExprMap.erase(N);
+ SelectExpr(N);
+ return;
+ }
+ assert(0 && "Should not be reached!");
+}
+
+
+/// createPPC32PatternInstructionSelector - This pass converts an LLVM function
+/// into a machine code representation using pattern matching and a machine
+/// description file.
+///
+FunctionPass *llvm::createPPC32ISelPattern(TargetMachine &TM) {
+ return new ISel(TM);
+}
\ No newline at end of file
projects / oota-llvm.git / commitdiff