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llvm-mirror/lib/Target/CellSPU/SPUISelDAGToDAG.cpp
Scott Michel dc780aeb57 Overhaul Cell SPU's addressing mode internals so that there are now 
only two addressing mode nodes, SPUaform and SPUindirect (vice the
three previous ones, SPUaform, SPUdform and SPUxform). This improves
code somewhat because we now avoid using reg+reg addressing when
it can be avoided. It also simplifies the address selection logic,
which was the main point for doing this.

Also, for various global variables that would be loaded using SPU's
A-form addressing, prefer D-form offs[reg] addressing, keeping the
base in a register if the variable is used more than once.

llvm-svn: 46483
2008-01-29 02:16:57 +00:00

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//===-- SPUISelDAGToDAG.cpp - CellSPU pattern matching inst selector ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a pattern matching instruction selector for the Cell SPU,
// converting from a legalized dag to a SPU-target dag.
//
//===----------------------------------------------------------------------===//
#include "SPU.h"
#include "SPUTargetMachine.h"
#include "SPUISelLowering.h"
#include "SPUHazardRecognizers.h"
#include "SPUFrameInfo.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Constants.h"
#include "llvm/GlobalValue.h"
#include "llvm/Intrinsics.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Compiler.h"
#include <iostream>
#include <queue>
#include <set>
using namespace llvm;
namespace {
//! ConstantSDNode predicate for i32 sign-extended, 10-bit immediates
bool
isI64IntS10Immediate(ConstantSDNode *CN)
{
return isS10Constant(CN->getValue());
}
//! ConstantSDNode predicate for i32 sign-extended, 10-bit immediates
bool
isI32IntS10Immediate(ConstantSDNode *CN)
{
return isS10Constant((int) CN->getValue());
}
#if 0
//! SDNode predicate for sign-extended, 10-bit immediate values
bool
isI32IntS10Immediate(SDNode *N)
{
return (N->getOpcode() == ISD::Constant
&& isI32IntS10Immediate(cast<ConstantSDNode>(N)));
}
#endif
//! ConstantSDNode predicate for i32 unsigned 10-bit immediate values
bool
isI32IntU10Immediate(ConstantSDNode *CN)
{
return isU10Constant((int) CN->getValue());
}
//! ConstantSDNode predicate for i16 sign-extended, 10-bit immediate values
bool
isI16IntS10Immediate(ConstantSDNode *CN)
{
return isS10Constant((short) CN->getValue());
}
//! SDNode predicate for i16 sign-extended, 10-bit immediate values
bool
isI16IntS10Immediate(SDNode *N)
{
return (N->getOpcode() == ISD::Constant
&& isI16IntS10Immediate(cast<ConstantSDNode>(N)));
}
//! ConstantSDNode predicate for i16 unsigned 10-bit immediate values
bool
isI16IntU10Immediate(ConstantSDNode *CN)
{
return isU10Constant((short) CN->getValue());
}
//! SDNode predicate for i16 sign-extended, 10-bit immediate values
bool
isI16IntU10Immediate(SDNode *N)
{
return (N->getOpcode() == ISD::Constant
&& isI16IntU10Immediate(cast<ConstantSDNode>(N)));
}
//! ConstantSDNode predicate for signed 16-bit values
/*!
\arg CN The constant SelectionDAG node holding the value
\arg Imm The returned 16-bit value, if returning true
This predicate tests the value in \a CN to see whether it can be
represented as a 16-bit, sign-extended quantity. Returns true if
this is the case.
*/
bool
isIntS16Immediate(ConstantSDNode *CN, short &Imm)
{
MVT::ValueType vt = CN->getValueType(0);
Imm = (short) CN->getValue();
if (vt >= MVT::i1 && vt <= MVT::i16) {
return true;
} else if (vt == MVT::i32) {
int32_t i_val = (int32_t) CN->getValue();
short s_val = (short) i_val;
return i_val == s_val;
} else {
int64_t i_val = (int64_t) CN->getValue();
short s_val = (short) i_val;
return i_val == s_val;
}
return false;
}
//! SDNode predicate for signed 16-bit values.
bool
isIntS16Immediate(SDNode *N, short &Imm)
{
return (N->getOpcode() == ISD::Constant
&& isIntS16Immediate(cast<ConstantSDNode>(N), Imm));
}
//! ConstantFPSDNode predicate for representing floats as 16-bit sign ext.
static bool
isFPS16Immediate(ConstantFPSDNode *FPN, short &Imm)
{
MVT::ValueType vt = FPN->getValueType(0);
if (vt == MVT::f32) {
int val = FloatToBits(FPN->getValueAPF().convertToFloat());
int sval = (int) ((val << 16) >> 16);
Imm = (short) val;
return val == sval;
}
return false;
}
bool
isHighLow(const SDOperand &Op)
{
return (Op.getOpcode() == SPUISD::IndirectAddr
&& ((Op.getOperand(0).getOpcode() == SPUISD::Hi
&& Op.getOperand(1).getOpcode() == SPUISD::Lo)
|| (Op.getOperand(0).getOpcode() == SPUISD::Lo
&& Op.getOperand(1).getOpcode() == SPUISD::Hi)));
}
//===------------------------------------------------------------------===//
//! MVT::ValueType to "useful stuff" mapping structure:
struct valtype_map_s {
MVT::ValueType VT;
unsigned ldresult_ins; /// LDRESULT instruction (0 = undefined)
int prefslot_byte; /// Byte offset of the "preferred" slot
unsigned insmask_ins; /// Insert mask instruction for a-form
};
const valtype_map_s valtype_map[] = {
{ MVT::i1, 0, 3, 0 },
{ MVT::i8, SPU::ORBIr8, 3, 0 },
{ MVT::i16, SPU::ORHIr16, 2, 0 },
{ MVT::i32, SPU::ORIr32, 0, 0 },
{ MVT::i64, SPU::ORIr64, 0, 0 },
{ MVT::f32, 0, 0, 0 },
{ MVT::f64, 0, 0, 0 },
// vector types... (sigh!)
{ MVT::v16i8, 0, 0, SPU::CBD },
{ MVT::v8i16, 0, 0, SPU::CHD },
{ MVT::v4i32, 0, 0, SPU::CWD },
{ MVT::v2i64, 0, 0, 0 },
{ MVT::v4f32, 0, 0, SPU::CWD },
{ MVT::v2f64, 0, 0, 0 }
};
const size_t n_valtype_map = sizeof(valtype_map) / sizeof(valtype_map[0]);
const valtype_map_s *getValueTypeMapEntry(MVT::ValueType VT)
{
const valtype_map_s *retval = 0;
for (size_t i = 0; i < n_valtype_map; ++i) {
if (valtype_map[i].VT == VT) {
retval = valtype_map + i;
break;
}
}
#ifndef NDEBUG
if (retval == 0) {
cerr << "SPUISelDAGToDAG.cpp: getValueTypeMapEntry returns NULL for "
<< MVT::getValueTypeString(VT)
<< "\n";
abort();
}
#endif
return retval;
}
}
//===--------------------------------------------------------------------===//
/// SPUDAGToDAGISel - Cell SPU-specific code to select SPU machine
/// instructions for SelectionDAG operations.
///
class SPUDAGToDAGISel :
public SelectionDAGISel
{
SPUTargetMachine &TM;
SPUTargetLowering &SPUtli;
unsigned GlobalBaseReg;
public:
SPUDAGToDAGISel(SPUTargetMachine &tm) :
SelectionDAGISel(*tm.getTargetLowering()),
TM(tm),
SPUtli(*tm.getTargetLowering())
{}
virtual bool runOnFunction(Function &Fn) {
// Make sure we re-emit a set of the global base reg if necessary
GlobalBaseReg = 0;
SelectionDAGISel::runOnFunction(Fn);
return true;
}
/// getI32Imm - Return a target constant with the specified value, of type
/// i32.
inline SDOperand getI32Imm(uint32_t Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
}
/// getI64Imm - Return a target constant with the specified value, of type
/// i64.
inline SDOperand getI64Imm(uint64_t Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i64);
}
/// getSmallIPtrImm - Return a target constant of pointer type.
inline SDOperand getSmallIPtrImm(unsigned Imm) {
return CurDAG->getTargetConstant(Imm, SPUtli.getPointerTy());
}
/// Select - Convert the specified operand from a target-independent to a
/// target-specific node if it hasn't already been changed.
SDNode *Select(SDOperand Op);
/// Return true if the address N is a RI7 format address [r+imm]
bool SelectDForm2Addr(SDOperand Op, SDOperand N, SDOperand &Disp,
SDOperand &Base);
//! Returns true if the address N is an A-form (local store) address
bool SelectAFormAddr(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Index);
//! D-form address predicate
bool SelectDFormAddr(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Index);
//! Address predicate if N can be expressed as an indexed [r+r] operation.
bool SelectXFormAddr(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Index);
/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
/// inline asm expressions.
virtual bool SelectInlineAsmMemoryOperand(const SDOperand &Op,
char ConstraintCode,
std::vector<SDOperand> &OutOps,
SelectionDAG &DAG) {
SDOperand Op0, Op1;
switch (ConstraintCode) {
default: return true;
case 'm': // memory
if (!SelectDFormAddr(Op, Op, Op0, Op1)
&& !SelectAFormAddr(Op, Op, Op0, Op1))
SelectXFormAddr(Op, Op, Op0, Op1);
break;
case 'o': // offsetable
if (!SelectDFormAddr(Op, Op, Op0, Op1)
&& !SelectAFormAddr(Op, Op, Op0, Op1)) {
Op0 = Op;
AddToISelQueue(Op0); // r+0.
Op1 = getSmallIPtrImm(0);
}
break;
case 'v': // not offsetable
#if 1
assert(0 && "InlineAsmMemoryOperand 'v' constraint not handled.");
#else
SelectAddrIdxOnly(Op, Op, Op0, Op1);
#endif
break;
}
OutOps.push_back(Op0);
OutOps.push_back(Op1);
return false;
}
/// InstructionSelectBasicBlock - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
virtual const char *getPassName() const {
return "Cell SPU DAG->DAG Pattern Instruction Selection";
}
/// CreateTargetHazardRecognizer - Return the hazard recognizer to use for
/// this target when scheduling the DAG.
virtual HazardRecognizer *CreateTargetHazardRecognizer() {
const TargetInstrInfo *II = SPUtli.getTargetMachine().getInstrInfo();
assert(II && "No InstrInfo?");
return new SPUHazardRecognizer(*II);
}
// Include the pieces autogenerated from the target description.
#include "SPUGenDAGISel.inc"
};
/// InstructionSelectBasicBlock - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
void
SPUDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG)
{
DEBUG(BB->dump());
// Select target instructions for the DAG.
DAG.setRoot(SelectRoot(DAG.getRoot()));
DAG.RemoveDeadNodes();
// Emit machine code to BB.
ScheduleAndEmitDAG(DAG);
}
bool
SPUDAGToDAGISel::SelectDForm2Addr(SDOperand Op, SDOperand N, SDOperand &Disp,
SDOperand &Base) {
unsigned Opc = N.getOpcode();
unsigned VT = N.getValueType();
MVT::ValueType PtrVT = SPUtli.getPointerTy();
ConstantSDNode *CN = 0;
int Imm;
if (Opc == ISD::ADD) {
SDOperand Op0 = N.getOperand(0);
SDOperand Op1 = N.getOperand(1);
if (Op1.getOpcode() == ISD::Constant ||
Op1.getOpcode() == ISD::TargetConstant) {
CN = cast<ConstantSDNode>(Op1);
Imm = int(CN->getValue());
if (Imm <= 0xff) {
Disp = CurDAG->getTargetConstant(Imm, SPUtli.getPointerTy());
Base = Op0;
return true;
}
}
} else if (Opc == ISD::GlobalAddress
|| Opc == ISD::TargetGlobalAddress
|| Opc == ISD::Register) {
// Plain old local store address:
Disp = CurDAG->getTargetConstant(0, VT);
Base = N;
return true;
} else if (Opc == SPUISD::IndirectAddr) {
SDOperand Op1 = N.getOperand(1);
if (Op1.getOpcode() == ISD::TargetConstant
|| Op1.getOpcode() == ISD::Constant) {
CN = cast<ConstantSDNode>(N.getOperand(1));
assert(CN != 0 && "SelectIndirectAddr/SPUISD::DForm2Addr expecting constant");
Imm = unsigned(CN->getValue());
if (Imm < 0xff) {
Disp = CurDAG->getTargetConstant(CN->getValue(), PtrVT);
Base = N.getOperand(0);
return true;
}
}
}
return false;
}
/*!
\arg Op The ISD instructio operand
\arg N The address to be tested
\arg Base The base address
\arg Index The base address index
*/
bool
SPUDAGToDAGISel::SelectAFormAddr(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Index) {
// These match the addr256k operand type:
MVT::ValueType OffsVT = MVT::i16;
SDOperand Zero = CurDAG->getTargetConstant(0, OffsVT);
switch (N.getOpcode()) {
case ISD::Constant:
case ISD::ConstantPool:
case ISD::GlobalAddress:
cerr << "SPU SelectAFormAddr: Constant/Pool/Global not lowered.\n";
abort();
/*NOTREACHED*/
case ISD::TargetConstant:
case ISD::TargetGlobalAddress:
case ISD::TargetJumpTable:
cerr << "SPUSelectAFormAddr: Target Constant/Pool/Global not wrapped as "
<< "A-form address.\n";
abort();
/*NOTREACHED*/
case SPUISD::AFormAddr:
// Just load from memory if there's only a single use of the location,
// otherwise, this will get handled below with D-form offset addresses
if (N.hasOneUse()) {
SDOperand Op0 = N.getOperand(0);
switch (Op0.getOpcode()) {
case ISD::TargetConstantPool:
case ISD::TargetJumpTable:
Base = Op0;
Index = Zero;
return true;
case ISD::TargetGlobalAddress: {
GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op0);
GlobalValue *GV = GSDN->getGlobal();
if (GV->getAlignment() == 16) {
Base = Op0;
Index = Zero;
return true;
}
break;
}
}
}
break;
}
return false;
}
/*!
\arg Op The ISD instruction (ignored)
\arg N The address to be tested
\arg Base Base address register/pointer
\arg Index Base address index
Examine the input address by a base register plus a signed 10-bit
displacement, [r+I10] (D-form address).
\return true if \a N is a D-form address with \a Base and \a Index set
to non-empty SDOperand instances.
*/
bool
SPUDAGToDAGISel::SelectDFormAddr(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Index) {
unsigned Opc = N.getOpcode();
unsigned PtrTy = SPUtli.getPointerTy();
if (Opc == ISD::FrameIndex) {
// Stack frame index must be less than 512 (divided by 16):
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N);
DEBUG(cerr << "SelectDFormAddr: ISD::FrameIndex = "
<< FI->getIndex() << "\n");
if (FI->getIndex() < SPUFrameInfo::maxFrameOffset()) {
Base = CurDAG->getTargetConstant(0, PtrTy);
Index = CurDAG->getTargetFrameIndex(FI->getIndex(), PtrTy);
return true;
}
} else if (Opc == ISD::ADD) {
// Generated by getelementptr
const SDOperand Op0 = N.getOperand(0);
const SDOperand Op1 = N.getOperand(1);
if ((Op0.getOpcode() == SPUISD::Hi && Op1.getOpcode() == SPUISD::Lo)
|| (Op1.getOpcode() == SPUISD::Hi && Op0.getOpcode() == SPUISD::Lo)) {
Base = CurDAG->getTargetConstant(0, PtrTy);
Index = N;
return true;
} else if (Op1.getOpcode() == ISD::Constant
|| Op1.getOpcode() == ISD::TargetConstant) {
ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Op1);
int32_t offset = int32_t(CN->getSignExtended());
if (Op0.getOpcode() == ISD::FrameIndex) {
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Op0);
DEBUG(cerr << "SelectDFormAddr: ISD::ADD offset = " << offset
<< " frame index = " << FI->getIndex() << "\n");
if (FI->getIndex() < SPUFrameInfo::maxFrameOffset()) {
Base = CurDAG->getTargetConstant(offset, PtrTy);
Index = CurDAG->getTargetFrameIndex(FI->getIndex(), PtrTy);
return true;
}
} else if (offset > SPUFrameInfo::minFrameOffset()
&& offset < SPUFrameInfo::maxFrameOffset()) {
Base = CurDAG->getTargetConstant(offset, PtrTy);
Index = Op0;
return true;
}
} else if (Op0.getOpcode() == ISD::Constant
|| Op0.getOpcode() == ISD::TargetConstant) {
ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Op0);
int32_t offset = int32_t(CN->getSignExtended());
if (Op1.getOpcode() == ISD::FrameIndex) {
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Op1);
DEBUG(cerr << "SelectDFormAddr: ISD::ADD offset = " << offset
<< " frame index = " << FI->getIndex() << "\n");
if (FI->getIndex() < SPUFrameInfo::maxFrameOffset()) {
Base = CurDAG->getTargetConstant(offset, PtrTy);
Index = CurDAG->getTargetFrameIndex(FI->getIndex(), PtrTy);
return true;
}
} else if (offset > SPUFrameInfo::minFrameOffset()
&& offset < SPUFrameInfo::maxFrameOffset()) {
Base = CurDAG->getTargetConstant(offset, PtrTy);
Index = Op1;
return true;
}
}
} else if (Opc == SPUISD::IndirectAddr) {
// Indirect with constant offset -> D-Form address
const SDOperand Op0 = N.getOperand(0);
const SDOperand Op1 = N.getOperand(1);
SDOperand Zero = CurDAG->getTargetConstant(0, N.getValueType());
if (Op1.getOpcode() == ISD::Constant
|| Op1.getOpcode() == ISD::TargetConstant) {
ConstantSDNode *CN = cast<ConstantSDNode>(Op1);
int32_t offset = int32_t(CN->getSignExtended());
if (offset > SPUFrameInfo::minFrameOffset()
&& offset < SPUFrameInfo::maxFrameOffset()) {
Base = CurDAG->getTargetConstant(CN->getValue(), PtrTy);
Index = Op0;
return true;
}
} else if (Op0.getOpcode() == ISD::Constant
|| Op0.getOpcode() == ISD::TargetConstant) {
ConstantSDNode *CN = cast<ConstantSDNode>(Op0);
int32_t offset = int32_t(CN->getSignExtended());
if (offset > SPUFrameInfo::minFrameOffset()
&& offset < SPUFrameInfo::maxFrameOffset()) {
Base = CurDAG->getTargetConstant(CN->getValue(), PtrTy);
Index = Op1;
return true;
}
} else if (Op0.getOpcode() == SPUISD::Hi
&& Op1.getOpcode() == SPUISD::Lo) {
// (SPUindirect (SPUhi <arg>, 0), (SPUlo <arg>, 0))
Base = CurDAG->getTargetConstant(0, PtrTy);
Index = N;
return true;
}
} else if (Opc == SPUISD::AFormAddr) {
Base = CurDAG->getTargetConstant(0, N.getValueType());
Index = N;
return true;
}
return false;
}
/*!
\arg Op The ISD instruction operand
\arg N The address operand
\arg Base The base pointer operand
\arg Index The offset/index operand
If the address \a N can be expressed as a [r + s10imm] address, returns false.
Otherwise, creates two operands, Base and Index that will become the [r+r]
address.
*/
bool
SPUDAGToDAGISel::SelectXFormAddr(SDOperand Op, SDOperand N, SDOperand &Base,
SDOperand &Index) {
if (SelectAFormAddr(Op, N, Base, Index)
|| SelectDFormAddr(Op, N, Base, Index))
return false;
// All else fails, punt and use an X-form address:
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
}
//! Convert the operand from a target-independent to a target-specific node
/*!
*/
SDNode *
SPUDAGToDAGISel::Select(SDOperand Op) {
SDNode *N = Op.Val;
unsigned Opc = N->getOpcode();
int n_ops = -1;
unsigned NewOpc;
MVT::ValueType OpVT = Op.getValueType();
SDOperand Ops[8];
if (Opc >= ISD::BUILTIN_OP_END && Opc < SPUISD::FIRST_NUMBER) {
return NULL; // Already selected.
} else if (Opc == ISD::FrameIndex) {
// Selects to AIr32 FI, 0 which in turn will become AIr32 SP, imm.
int FI = cast<FrameIndexSDNode>(N)->getIndex();
MVT::ValueType PtrVT = SPUtli.getPointerTy();
SDOperand Zero = CurDAG->getTargetConstant(0, PtrVT);
SDOperand TFI = CurDAG->getTargetFrameIndex(FI, PtrVT);
DEBUG(cerr << "SPUDAGToDAGISel: Replacing FrameIndex with AI32 <FI>, 0\n");
NewOpc = SPU::AIr32;
Ops[0] = TFI;
Ops[1] = Zero;
n_ops = 2;
} else if (Opc == ISD::ZERO_EXTEND) {
// (zero_extend:i16 (and:i8 <arg>, <const>))
const SDOperand &Op1 = N->getOperand(0);
if (Op.getValueType() == MVT::i16 && Op1.getValueType() == MVT::i8) {
if (Op1.getOpcode() == ISD::AND) {
// Fold this into a single ANDHI. This is often seen in expansions of i1
// to i8, then i8 to i16 in logical/branching operations.
DEBUG(cerr << "CellSPU: Coalescing (zero_extend:i16 (and:i8 "
"<arg>, <const>))\n");
NewOpc = SPU::ANDHI1To2;
Ops[0] = Op1.getOperand(0);
Ops[1] = Op1.getOperand(1);
n_ops = 2;
}
}
} else if (Opc == SPUISD::INSERT_MASK) {
SDOperand Op0 = Op.getOperand(0);
if (Op0.getOpcode() == SPUISD::AFormAddr) {
// (SPUvecinsmask (SPUaform <arg>, 0)) ->
// (CBD|CHD|CWD 0, arg)
const valtype_map_s *vtm = getValueTypeMapEntry(OpVT);
ConstantSDNode *CN = cast<ConstantSDNode>(Op0.getOperand(1));
assert(vtm->insmask_ins != 0 && "missing insert mask instruction");
NewOpc = vtm->insmask_ins;
Ops[0] = CurDAG->getTargetConstant(CN->getValue(), Op0.getValueType());
Ops[1] = Op0;
n_ops = 2;
AddToISelQueue(Op0);
} else if (Op0.getOpcode() == ISD::FrameIndex) {
// (SPUvecinsmask <fi>) ->
// (CBD|CHD|CWD 0, <fi>)
const valtype_map_s *vtm = getValueTypeMapEntry(OpVT);
NewOpc = vtm->insmask_ins;
Ops[0] = CurDAG->getTargetConstant(0, Op0.getValueType());
Ops[1] = Op0;
n_ops = 2;
} else if (isHighLow(Op0)) {
// (SPUvecinsmask (SPUindirect (SPUhi <arg>, 0), (SPUlow <arg>, 0))) ->
// (CBD|CHD|CWD 0, arg)
const valtype_map_s *vtm = getValueTypeMapEntry(OpVT);
NewOpc = vtm->insmask_ins;
Ops[0] = CurDAG->getTargetConstant(0, Op0.getValueType());
Ops[1] = Op0;
n_ops = 2;
AddToISelQueue(Op0);
}
} else if (Opc == SPUISD::LDRESULT) {
// Custom select instructions for LDRESULT
unsigned VT = N->getValueType(0);
SDOperand Arg = N->getOperand(0);
SDOperand Chain = N->getOperand(1);
SDNode *Result;
AddToISelQueue(Arg);
if (!MVT::isFloatingPoint(VT)) {
SDOperand Zero = CurDAG->getTargetConstant(0, VT);
const valtype_map_s *vtm = getValueTypeMapEntry(VT);
if (vtm->ldresult_ins == 0) {
cerr << "LDRESULT for unsupported type: "
<< MVT::getValueTypeString(VT)
<< "\n";
abort();
} else
Opc = vtm->ldresult_ins;
AddToISelQueue(Zero);
Result = CurDAG->getTargetNode(Opc, VT, MVT::Other, Arg, Zero, Chain);
} else {
Opc = (VT == MVT::f32 ? SPU::ORf32 : SPU::ORf64);
Result = CurDAG->getTargetNode(Opc, MVT::Other, Arg, Arg, Chain);
}
Chain = SDOperand(Result, 1);
AddToISelQueue(Chain);
return Result;
} else if (Opc == SPUISD::IndirectAddr) {
SDOperand Op0 = Op.getOperand(0);
if (Op0.getOpcode() == SPUISD::LDRESULT
|| Op0.getOpcode() == SPUISD::AFormAddr) {
// (IndirectAddr (LDRESULT|AFormAddr, imm))
SDOperand Op1 = Op.getOperand(1);
MVT::ValueType VT = Op.getValueType();
DEBUG(cerr << "CellSPU: IndirectAddr("
<< (Op0.getOpcode() == SPUISD::LDRESULT
? "LDRESULT"
: "AFormAddr")
<< ", imm):\nOp0 = ");
DEBUG(Op.getOperand(0).Val->dump(CurDAG));
DEBUG(cerr << "\nOp1 = ");
DEBUG(Op.getOperand(1).Val->dump(CurDAG));
DEBUG(cerr << "\n");
if (Op1.getOpcode() == ISD::Constant) {
ConstantSDNode *CN = cast<ConstantSDNode>(Op1);
Op1 = CurDAG->getTargetConstant(CN->getValue(), VT);
}
AddToISelQueue(Op0);
AddToISelQueue(Op1);
NewOpc = SPU::AIr32;
Ops[0] = Op0;
Ops[1] = Op1;
n_ops = 2;
}
}
if (n_ops > 0) {
if (N->hasOneUse())
return CurDAG->SelectNodeTo(N, NewOpc, OpVT, Ops, n_ops);
else
return CurDAG->getTargetNode(NewOpc, OpVT, Ops, n_ops);
} else
return SelectCode(Op);
}
/// createPPCISelDag - This pass converts a legalized DAG into a
/// SPU-specific DAG, ready for instruction scheduling.
///
FunctionPass *llvm::createSPUISelDag(SPUTargetMachine &TM) {
return new SPUDAGToDAGISel(TM);
}
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