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llvm-6502/lib/Target/Alpha/AlphaISelLowering.cpp
Evan Cheng d2cde68855 Default ISD::PREFETCH to expand. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48169 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-10 19:38:10 +00:00

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//===-- AlphaISelLowering.cpp - Alpha DAG Lowering Implementation ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the AlphaISelLowering class.
//
//===----------------------------------------------------------------------===//
#include "AlphaISelLowering.h"
#include "AlphaTargetMachine.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
/// AddLiveIn - This helper function adds the specified physical register to the
/// MachineFunction as a live in value. It also creates a corresponding virtual
/// register for it.
static unsigned AddLiveIn(MachineFunction &MF, unsigned PReg,
TargetRegisterClass *RC) {
assert(RC->contains(PReg) && "Not the correct regclass!");
unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
MF.getRegInfo().addLiveIn(PReg, VReg);
return VReg;
}
AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM) : TargetLowering(TM) {
// Set up the TargetLowering object.
//I am having problems with shr n ubyte 1
setShiftAmountType(MVT::i64);
setSetCCResultContents(ZeroOrOneSetCCResult);
setUsesGlobalOffsetTable(true);
addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
addRegisterClass(MVT::f64, Alpha::F8RCRegisterClass);
addRegisterClass(MVT::f32, Alpha::F4RCRegisterClass);
setLoadXAction(ISD::EXTLOAD, MVT::i1, Promote);
setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
setLoadXAction(ISD::ZEXTLOAD, MVT::i1, Promote);
setLoadXAction(ISD::ZEXTLOAD, MVT::i32, Expand);
setLoadXAction(ISD::SEXTLOAD, MVT::i1, Promote);
setLoadXAction(ISD::SEXTLOAD, MVT::i8, Expand);
setLoadXAction(ISD::SEXTLOAD, MVT::i16, Expand);
// setOperationAction(ISD::BRIND, MVT::Other, Expand);
setOperationAction(ISD::BR_JT, MVT::Other, Expand);
setOperationAction(ISD::BR_CC, MVT::Other, Expand);
setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
setOperationAction(ISD::FREM, MVT::f32, Expand);
setOperationAction(ISD::FREM, MVT::f64, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
if (!TM.getSubtarget<AlphaSubtarget>().hasCT()) {
setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
}
setOperationAction(ISD::BSWAP , MVT::i64, Expand);
setOperationAction(ISD::ROTL , MVT::i64, Expand);
setOperationAction(ISD::ROTR , MVT::i64, Expand);
setOperationAction(ISD::SREM , MVT::i64, Custom);
setOperationAction(ISD::UREM , MVT::i64, Custom);
setOperationAction(ISD::SDIV , MVT::i64, Custom);
setOperationAction(ISD::UDIV , MVT::i64, Custom);
setOperationAction(ISD::MEMMOVE , MVT::Other, Expand);
setOperationAction(ISD::MEMSET , MVT::Other, Expand);
setOperationAction(ISD::MEMCPY , MVT::Other, Expand);
// We don't support sin/cos/sqrt/pow
setOperationAction(ISD::FSIN , MVT::f64, Expand);
setOperationAction(ISD::FCOS , MVT::f64, Expand);
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
setOperationAction(ISD::FSQRT, MVT::f64, Expand);
setOperationAction(ISD::FSQRT, MVT::f32, Expand);
setOperationAction(ISD::FPOW , MVT::f32, Expand);
setOperationAction(ISD::FPOW , MVT::f64, Expand);
setOperationAction(ISD::SETCC, MVT::f32, Promote);
setOperationAction(ISD::BIT_CONVERT, MVT::f32, Promote);
// We don't have line number support yet.
setOperationAction(ISD::LOCATION, MVT::Other, Expand);
setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
setOperationAction(ISD::LABEL, MVT::Other, Expand);
// Not implemented yet.
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
// We want to legalize GlobalAddress and ConstantPool and
// ExternalSymbols nodes into the appropriate instructions to
// materialize the address.
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
setOperationAction(ISD::ExternalSymbol, MVT::i64, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
setOperationAction(ISD::VASTART, MVT::Other, Custom);
setOperationAction(ISD::VAEND, MVT::Other, Expand);
setOperationAction(ISD::VACOPY, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::i32, Custom);
setOperationAction(ISD::RET, MVT::Other, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i32, Custom);
setStackPointerRegisterToSaveRestore(Alpha::R30);
addLegalFPImmediate(APFloat(+0.0)); //F31
addLegalFPImmediate(APFloat(+0.0f)); //F31
addLegalFPImmediate(APFloat(-0.0)); //-F31
addLegalFPImmediate(APFloat(-0.0f)); //-F31
setJumpBufSize(272);
setJumpBufAlignment(16);
computeRegisterProperties();
}
MVT::ValueType
AlphaTargetLowering::getSetCCResultType(const SDOperand &) const {
return MVT::i64;
}
const char *AlphaTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return 0;
case AlphaISD::CVTQT_: return "Alpha::CVTQT_";
case AlphaISD::CVTQS_: return "Alpha::CVTQS_";
case AlphaISD::CVTTQ_: return "Alpha::CVTTQ_";
case AlphaISD::GPRelHi: return "Alpha::GPRelHi";
case AlphaISD::GPRelLo: return "Alpha::GPRelLo";
case AlphaISD::RelLit: return "Alpha::RelLit";
case AlphaISD::GlobalRetAddr: return "Alpha::GlobalRetAddr";
case AlphaISD::CALL: return "Alpha::CALL";
case AlphaISD::DivCall: return "Alpha::DivCall";
case AlphaISD::RET_FLAG: return "Alpha::RET_FLAG";
case AlphaISD::COND_BRANCH_I: return "Alpha::COND_BRANCH_I";
case AlphaISD::COND_BRANCH_F: return "Alpha::COND_BRANCH_F";
}
}
static SDOperand LowerJumpTable(SDOperand Op, SelectionDAG &DAG) {
MVT::ValueType PtrVT = Op.getValueType();
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
SDOperand JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
SDOperand Zero = DAG.getConstant(0, PtrVT);
SDOperand Hi = DAG.getNode(AlphaISD::GPRelHi, MVT::i64, JTI,
DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
SDOperand Lo = DAG.getNode(AlphaISD::GPRelLo, MVT::i64, JTI, Hi);
return Lo;
}
//http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/
//AA-PY8AC-TET1_html/callCH3.html#BLOCK21
//For now, just use variable size stack frame format
//In a standard call, the first six items are passed in registers $16
//- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
//of argument-to-register correspondence.) The remaining items are
//collected in a memory argument list that is a naturally aligned
//array of quadwords. In a standard call, this list, if present, must
//be passed at 0(SP).
//7 ... n 0(SP) ... (n-7)*8(SP)
// //#define FP $15
// //#define RA $26
// //#define PV $27
// //#define GP $29
// //#define SP $30
static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
int &VarArgsBase,
int &VarArgsOffset) {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
std::vector<SDOperand> ArgValues;
SDOperand Root = Op.getOperand(0);
AddLiveIn(MF, Alpha::R29, &Alpha::GPRCRegClass); //GP
AddLiveIn(MF, Alpha::R26, &Alpha::GPRCRegClass); //RA
unsigned args_int[] = {
Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
unsigned args_float[] = {
Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
for (unsigned ArgNo = 0, e = Op.Val->getNumValues()-1; ArgNo != e; ++ArgNo) {
SDOperand argt;
MVT::ValueType ObjectVT = Op.getValue(ArgNo).getValueType();
SDOperand ArgVal;
if (ArgNo < 6) {
switch (ObjectVT) {
default:
cerr << "Unknown Type " << ObjectVT << "\n";
abort();
case MVT::f64:
args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
&Alpha::F8RCRegClass);
ArgVal = DAG.getCopyFromReg(Root, args_float[ArgNo], ObjectVT);
break;
case MVT::f32:
args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
&Alpha::F4RCRegClass);
ArgVal = DAG.getCopyFromReg(Root, args_float[ArgNo], ObjectVT);
break;
case MVT::i64:
args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
&Alpha::GPRCRegClass);
ArgVal = DAG.getCopyFromReg(Root, args_int[ArgNo], MVT::i64);
break;
}
} else { //more args
// Create the frame index object for this incoming parameter...
int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6));
// Create the SelectionDAG nodes corresponding to a load
//from this parameter
SDOperand FIN = DAG.getFrameIndex(FI, MVT::i64);
ArgVal = DAG.getLoad(ObjectVT, Root, FIN, NULL, 0);
}
ArgValues.push_back(ArgVal);
}
// If the functions takes variable number of arguments, copy all regs to stack
bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
if (isVarArg) {
VarArgsOffset = (Op.Val->getNumValues()-1) * 8;
std::vector<SDOperand> LS;
for (int i = 0; i < 6; ++i) {
if (TargetRegisterInfo::isPhysicalRegister(args_int[i]))
args_int[i] = AddLiveIn(MF, args_int[i], &Alpha::GPRCRegClass);
SDOperand argt = DAG.getCopyFromReg(Root, args_int[i], MVT::i64);
int FI = MFI->CreateFixedObject(8, -8 * (6 - i));
if (i == 0) VarArgsBase = FI;
SDOperand SDFI = DAG.getFrameIndex(FI, MVT::i64);
LS.push_back(DAG.getStore(Root, argt, SDFI, NULL, 0));
if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
argt = DAG.getCopyFromReg(Root, args_float[i], MVT::f64);
FI = MFI->CreateFixedObject(8, - 8 * (12 - i));
SDFI = DAG.getFrameIndex(FI, MVT::i64);
LS.push_back(DAG.getStore(Root, argt, SDFI, NULL, 0));
}
//Set up a token factor with all the stack traffic
Root = DAG.getNode(ISD::TokenFactor, MVT::Other, &LS[0], LS.size());
}
ArgValues.push_back(Root);
// Return the new list of results.
std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
Op.Val->value_end());
return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
}
static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
SDOperand Copy = DAG.getCopyToReg(Op.getOperand(0), Alpha::R26,
DAG.getNode(AlphaISD::GlobalRetAddr,
MVT::i64),
SDOperand());
switch (Op.getNumOperands()) {
default:
assert(0 && "Do not know how to return this many arguments!");
abort();
case 1:
break;
//return SDOperand(); // ret void is legal
case 3: {
MVT::ValueType ArgVT = Op.getOperand(1).getValueType();
unsigned ArgReg;
if (MVT::isInteger(ArgVT))
ArgReg = Alpha::R0;
else {
assert(MVT::isFloatingPoint(ArgVT));
ArgReg = Alpha::F0;
}
Copy = DAG.getCopyToReg(Copy, ArgReg, Op.getOperand(1), Copy.getValue(1));
if (DAG.getMachineFunction().getRegInfo().liveout_empty())
DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
break;
}
}
return DAG.getNode(AlphaISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
}
std::pair<SDOperand, SDOperand>
AlphaTargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
bool RetSExt, bool RetZExt, bool isVarArg,
unsigned CallingConv, bool isTailCall,
SDOperand Callee, ArgListTy &Args,
SelectionDAG &DAG) {
int NumBytes = 0;
if (Args.size() > 6)
NumBytes = (Args.size() - 6) * 8;
Chain = DAG.getCALLSEQ_START(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].Ty)) {
default: assert(0 && "Unexpected ValueType for argument!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
// Promote the integer to 64 bits. If the input type is signed use a
// sign extend, otherwise use a zero extend.
if (Args[i].isSExt)
Args[i].Node = DAG.getNode(ISD::SIGN_EXTEND, MVT::i64, Args[i].Node);
else if (Args[i].isZExt)
Args[i].Node = DAG.getNode(ISD::ZERO_EXTEND, MVT::i64, Args[i].Node);
else
Args[i].Node = DAG.getNode(ISD::ANY_EXTEND, MVT::i64, Args[i].Node);
break;
case MVT::i64:
case MVT::f64:
case MVT::f32:
break;
}
args_to_use.push_back(Args[i].Node);
}
std::vector<MVT::ValueType> RetVals;
MVT::ValueType RetTyVT = getValueType(RetTy);
MVT::ValueType ActualRetTyVT = RetTyVT;
if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i32)
ActualRetTyVT = MVT::i64;
if (RetTyVT != MVT::isVoid)
RetVals.push_back(ActualRetTyVT);
RetVals.push_back(MVT::Other);
std::vector<SDOperand> Ops;
Ops.push_back(Chain);
Ops.push_back(Callee);
Ops.insert(Ops.end(), args_to_use.begin(), args_to_use.end());
SDOperand TheCall = DAG.getNode(AlphaISD::CALL, RetVals, &Ops[0], Ops.size());
Chain = TheCall.getValue(RetTyVT != MVT::isVoid);
Chain = DAG.getCALLSEQ_END(Chain,
DAG.getConstant(NumBytes, getPointerTy()),
DAG.getConstant(0, getPointerTy()),
SDOperand());
SDOperand RetVal = TheCall;
if (RetTyVT != ActualRetTyVT) {
ISD::NodeType AssertKind = ISD::DELETED_NODE;
if (RetSExt)
AssertKind = ISD::AssertSext;
else if (RetZExt)
AssertKind = ISD::AssertZext;
if (AssertKind != ISD::DELETED_NODE)
RetVal = DAG.getNode(AssertKind, MVT::i64, RetVal,
DAG.getValueType(RetTyVT));
RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
}
return std::make_pair(RetVal, Chain);
}
/// LowerOperation - Provide custom lowering hooks for some operations.
///
SDOperand AlphaTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
default: assert(0 && "Wasn't expecting to be able to lower this!");
case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG,
VarArgsBase,
VarArgsOffset);
case ISD::RET: return LowerRET(Op,DAG);
case ISD::JumpTable: return LowerJumpTable(Op, DAG);
case ISD::SINT_TO_FP: {
assert(MVT::i64 == Op.getOperand(0).getValueType() &&
"Unhandled SINT_TO_FP type in custom expander!");
SDOperand LD;
bool isDouble = MVT::f64 == Op.getValueType();
LD = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, Op.getOperand(0));
SDOperand FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_,
isDouble?MVT::f64:MVT::f32, LD);
return FP;
}
case ISD::FP_TO_SINT: {
bool isDouble = MVT::f64 == Op.getOperand(0).getValueType();
SDOperand src = Op.getOperand(0);
if (!isDouble) //Promote
src = DAG.getNode(ISD::FP_EXTEND, MVT::f64, src);
src = DAG.getNode(AlphaISD::CVTTQ_, MVT::f64, src);
return DAG.getNode(ISD::BIT_CONVERT, MVT::i64, src);
}
case ISD::ConstantPool: {
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
Constant *C = CP->getConstVal();
SDOperand CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
SDOperand Hi = DAG.getNode(AlphaISD::GPRelHi, MVT::i64, CPI,
DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
SDOperand Lo = DAG.getNode(AlphaISD::GPRelLo, MVT::i64, CPI, Hi);
return Lo;
}
case ISD::GlobalTLSAddress:
assert(0 && "TLS not implemented for Alpha.");
case ISD::GlobalAddress: {
GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
GlobalValue *GV = GSDN->getGlobal();
SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i64, GSDN->getOffset());
// if (!GV->hasWeakLinkage() && !GV->isDeclaration() && !GV->hasLinkOnceLinkage()) {
if (GV->hasInternalLinkage()) {
SDOperand Hi = DAG.getNode(AlphaISD::GPRelHi, MVT::i64, GA,
DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
SDOperand Lo = DAG.getNode(AlphaISD::GPRelLo, MVT::i64, GA, Hi);
return Lo;
} else
return DAG.getNode(AlphaISD::RelLit, MVT::i64, GA,
DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
}
case ISD::ExternalSymbol: {
return DAG.getNode(AlphaISD::RelLit, MVT::i64,
DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
->getSymbol(), MVT::i64),
DAG.getNode(ISD::GLOBAL_OFFSET_TABLE, MVT::i64));
}
case ISD::UREM:
case ISD::SREM:
//Expand only on constant case
if (Op.getOperand(1).getOpcode() == ISD::Constant) {
MVT::ValueType VT = Op.Val->getValueType(0);
SDOperand Tmp1 = Op.Val->getOpcode() == ISD::UREM ?
BuildUDIV(Op.Val, DAG, NULL) :
BuildSDIV(Op.Val, DAG, NULL);
Tmp1 = DAG.getNode(ISD::MUL, VT, Tmp1, Op.getOperand(1));
Tmp1 = DAG.getNode(ISD::SUB, VT, Op.getOperand(0), Tmp1);
return Tmp1;
}
//fall through
case ISD::SDIV:
case ISD::UDIV:
if (MVT::isInteger(Op.getValueType())) {
if (Op.getOperand(1).getOpcode() == ISD::Constant)
return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.Val, DAG, NULL)
: BuildUDIV(Op.Val, DAG, NULL);
const char* opstr = 0;
switch (Op.getOpcode()) {
case ISD::UREM: opstr = "__remqu"; break;
case ISD::SREM: opstr = "__remq"; break;
case ISD::UDIV: opstr = "__divqu"; break;
case ISD::SDIV: opstr = "__divq"; break;
}
SDOperand Tmp1 = Op.getOperand(0),
Tmp2 = Op.getOperand(1),
Addr = DAG.getExternalSymbol(opstr, MVT::i64);
return DAG.getNode(AlphaISD::DivCall, MVT::i64, Addr, Tmp1, Tmp2);
}
break;
case ISD::VAARG: {
SDOperand Chain = Op.getOperand(0);
SDOperand VAListP = Op.getOperand(1);
const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
SDOperand Base = DAG.getLoad(MVT::i64, Chain, VAListP, VAListS, 0);
SDOperand Tmp = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
DAG.getConstant(8, MVT::i64));
SDOperand Offset = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Base.getValue(1),
Tmp, NULL, 0, MVT::i32);
SDOperand DataPtr = DAG.getNode(ISD::ADD, MVT::i64, Base, Offset);
if (MVT::isFloatingPoint(Op.getValueType()))
{
//if fp && Offset < 6*8, then subtract 6*8 from DataPtr
SDOperand FPDataPtr = DAG.getNode(ISD::SUB, MVT::i64, DataPtr,
DAG.getConstant(8*6, MVT::i64));
SDOperand CC = DAG.getSetCC(MVT::i64, Offset,
DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
DataPtr = DAG.getNode(ISD::SELECT, MVT::i64, CC, FPDataPtr, DataPtr);
}
SDOperand NewOffset = DAG.getNode(ISD::ADD, MVT::i64, Offset,
DAG.getConstant(8, MVT::i64));
SDOperand Update = DAG.getTruncStore(Offset.getValue(1), NewOffset,
Tmp, NULL, 0, MVT::i32);
SDOperand Result;
if (Op.getValueType() == MVT::i32)
Result = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Update, DataPtr,
NULL, 0, MVT::i32);
else
Result = DAG.getLoad(Op.getValueType(), Update, DataPtr, NULL, 0);
return Result;
}
case ISD::VACOPY: {
SDOperand Chain = Op.getOperand(0);
SDOperand DestP = Op.getOperand(1);
SDOperand SrcP = Op.getOperand(2);
const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
SDOperand Val = DAG.getLoad(getPointerTy(), Chain, SrcP, SrcS, 0);
SDOperand Result = DAG.getStore(Val.getValue(1), Val, DestP, DestS, 0);
SDOperand NP = DAG.getNode(ISD::ADD, MVT::i64, SrcP,
DAG.getConstant(8, MVT::i64));
Val = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Result, NP, NULL,0, MVT::i32);
SDOperand NPD = DAG.getNode(ISD::ADD, MVT::i64, DestP,
DAG.getConstant(8, MVT::i64));
return DAG.getTruncStore(Val.getValue(1), Val, NPD, NULL, 0, MVT::i32);
}
case ISD::VASTART: {
SDOperand Chain = Op.getOperand(0);
SDOperand VAListP = Op.getOperand(1);
const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
// vastart stores the address of the VarArgsBase and VarArgsOffset
SDOperand FR = DAG.getFrameIndex(VarArgsBase, MVT::i64);
SDOperand S1 = DAG.getStore(Chain, FR, VAListP, VAListS, 0);
SDOperand SA2 = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
DAG.getConstant(8, MVT::i64));
return DAG.getTruncStore(S1, DAG.getConstant(VarArgsOffset, MVT::i64),
SA2, NULL, 0, MVT::i32);
}
case ISD::RETURNADDR:
return DAG.getNode(AlphaISD::GlobalRetAddr, MVT::i64);
//FIXME: implement
case ISD::FRAMEADDR: break;
}
return SDOperand();
}
SDOperand AlphaTargetLowering::CustomPromoteOperation(SDOperand Op,
SelectionDAG &DAG) {
assert(Op.getValueType() == MVT::i32 &&
Op.getOpcode() == ISD::VAARG &&
"Unknown node to custom promote!");
// The code in LowerOperation already handles i32 vaarg
return LowerOperation(Op, DAG);
}
//Inline Asm
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
AlphaTargetLowering::ConstraintType
AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default: break;
case 'f':
case 'r':
return C_RegisterClass;
}
}
return TargetLowering::getConstraintType(Constraint);
}
std::vector<unsigned> AlphaTargetLowering::
getRegClassForInlineAsmConstraint(const std::string &Constraint,
MVT::ValueType VT) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default: break; // Unknown constriant letter
case 'f':
return make_vector<unsigned>(Alpha::F0 , Alpha::F1 , Alpha::F2 ,
Alpha::F3 , Alpha::F4 , Alpha::F5 ,
Alpha::F6 , Alpha::F7 , Alpha::F8 ,
Alpha::F9 , Alpha::F10, Alpha::F11,
Alpha::F12, Alpha::F13, Alpha::F14,
Alpha::F15, Alpha::F16, Alpha::F17,
Alpha::F18, Alpha::F19, Alpha::F20,
Alpha::F21, Alpha::F22, Alpha::F23,
Alpha::F24, Alpha::F25, Alpha::F26,
Alpha::F27, Alpha::F28, Alpha::F29,
Alpha::F30, Alpha::F31, 0);
case 'r':
return make_vector<unsigned>(Alpha::R0 , Alpha::R1 , Alpha::R2 ,
Alpha::R3 , Alpha::R4 , Alpha::R5 ,
Alpha::R6 , Alpha::R7 , Alpha::R8 ,
Alpha::R9 , Alpha::R10, Alpha::R11,
Alpha::R12, Alpha::R13, Alpha::R14,
Alpha::R15, Alpha::R16, Alpha::R17,
Alpha::R18, Alpha::R19, Alpha::R20,
Alpha::R21, Alpha::R22, Alpha::R23,
Alpha::R24, Alpha::R25, Alpha::R26,
Alpha::R27, Alpha::R28, Alpha::R29,
Alpha::R30, Alpha::R31, 0);
}
}
return std::vector<unsigned>();
}
//===----------------------------------------------------------------------===//
// Other Lowering Code
//===----------------------------------------------------------------------===//
MachineBasicBlock *
AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
assert((MI->getOpcode() == Alpha::CAS32 ||
MI->getOpcode() == Alpha::CAS64 ||
MI->getOpcode() == Alpha::LAS32 ||
MI->getOpcode() == Alpha::LAS64 ||
MI->getOpcode() == Alpha::SWAP32 ||
MI->getOpcode() == Alpha::SWAP64) &&
"Unexpected instr type to insert");
bool is32 = MI->getOpcode() == Alpha::CAS32 ||
MI->getOpcode() == Alpha::LAS32 ||
MI->getOpcode() == Alpha::SWAP32;
//Load locked store conditional for atomic ops take on the same form
//start:
//ll
//do stuff (maybe branch to exit)
//sc
//test sc and maybe branck to start
//exit:
const BasicBlock *LLVM_BB = BB->getBasicBlock();
ilist<MachineBasicBlock>::iterator It = BB;
++It;
MachineBasicBlock *thisMBB = BB;
MachineBasicBlock *llscMBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
for(MachineBasicBlock::succ_iterator i = thisMBB->succ_begin(),
e = thisMBB->succ_end(); i != e; ++i)
sinkMBB->addSuccessor(*i);
while(!thisMBB->succ_empty())
thisMBB->removeSuccessor(thisMBB->succ_begin());
MachineFunction *F = BB->getParent();
F->getBasicBlockList().insert(It, llscMBB);
F->getBasicBlockList().insert(It, sinkMBB);
BuildMI(thisMBB, TII->get(Alpha::BR)).addMBB(llscMBB);
unsigned reg_res = MI->getOperand(0).getReg(),
reg_ptr = MI->getOperand(1).getReg(),
reg_v2 = MI->getOperand(2).getReg(),
reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
BuildMI(llscMBB, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
reg_res).addImm(0).addReg(reg_ptr);
switch (MI->getOpcode()) {
case Alpha::CAS32:
case Alpha::CAS64: {
unsigned reg_cmp
= F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
BuildMI(llscMBB, TII->get(Alpha::CMPEQ), reg_cmp)
.addReg(reg_v2).addReg(reg_res);
BuildMI(llscMBB, TII->get(Alpha::BEQ))
.addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
BuildMI(llscMBB, TII->get(Alpha::BISr), reg_store)
.addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
break;
}
case Alpha::LAS32:
case Alpha::LAS64: {
BuildMI(llscMBB, TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
.addReg(reg_res).addReg(reg_v2);
break;
}
case Alpha::SWAP32:
case Alpha::SWAP64: {
BuildMI(llscMBB, TII->get(Alpha::BISr), reg_store)
.addReg(reg_v2).addReg(reg_v2);
break;
}
}
BuildMI(llscMBB, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
.addReg(reg_store).addImm(0).addReg(reg_ptr);
BuildMI(llscMBB, TII->get(Alpha::BEQ))
.addImm(0).addReg(reg_store).addMBB(llscMBB);
BuildMI(llscMBB, TII->get(Alpha::BR)).addMBB(sinkMBB);
thisMBB->addSuccessor(llscMBB);
llscMBB->addSuccessor(llscMBB);
llscMBB->addSuccessor(sinkMBB);
delete MI; // The pseudo instruction is gone now.
return sinkMBB;
}
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