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llvm-mirror/lib/Target/Mips/MipsISelDAGToDAG.cpp
Chris Lattner 1707a88a2c Sink InstructionSelect() out of each target into SDISel, and rename it 
DoInstructionSelection.  Inline "SelectRoot" into it from DAGISelHeader.
Sink some other stuff out of DAGISelHeader into SDISel.

Eliminate the various 'Indent' stuff from various targets, which dates
to when isel was recursive.

 17 files changed, 114 insertions(+), 430 deletions(-)

llvm-svn: 97555
2010-03-02 06:34:30 +00:00

537 lines
18 KiB
C++
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//===-- MipsISelDAGToDAG.cpp - A dag to dag inst selector for Mips --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the MIPS target.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-isel"
#include "Mips.h"
#include "MipsISelLowering.h"
#include "MipsMachineFunction.h"
#include "MipsRegisterInfo.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "llvm/GlobalValue.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/Support/CFG.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/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// MipsDAGToDAGISel - MIPS specific code to select MIPS machine
// instructions for SelectionDAG operations.
//===----------------------------------------------------------------------===//
namespace {
class MipsDAGToDAGISel : public SelectionDAGISel {
/// TM - Keep a reference to MipsTargetMachine.
MipsTargetMachine &TM;
/// Subtarget - Keep a pointer to the MipsSubtarget around so that we can
/// make the right decision when generating code for different targets.
const MipsSubtarget &Subtarget;
public:
explicit MipsDAGToDAGISel(MipsTargetMachine &tm) :
SelectionDAGISel(tm),
TM(tm), Subtarget(tm.getSubtarget<MipsSubtarget>()) {}
// Pass Name
virtual const char *getPassName() const {
return "MIPS DAG->DAG Pattern Instruction Selection";
}
private:
// Include the pieces autogenerated from the target description.
#include "MipsGenDAGISel.inc"
/// getTargetMachine - Return a reference to the TargetMachine, casted
/// to the target-specific type.
const MipsTargetMachine &getTargetMachine() {
return static_cast<const MipsTargetMachine &>(TM);
}
/// getInstrInfo - Return a reference to the TargetInstrInfo, casted
/// to the target-specific type.
const MipsInstrInfo *getInstrInfo() {
return getTargetMachine().getInstrInfo();
}
SDNode *getGlobalBaseReg();
SDNode *Select(SDNode *N);
// Complex Pattern.
bool SelectAddr(SDNode *Op, SDValue N,
SDValue &Base, SDValue &Offset);
SDNode *SelectLoadFp64(SDNode *N);
SDNode *SelectStoreFp64(SDNode *N);
// getI32Imm - Return a target constant with the specified
// value, of type i32.
inline SDValue getI32Imm(unsigned Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
}
};
}
/// getGlobalBaseReg - Output the instructions required to put the
/// GOT address into a register.
SDNode *MipsDAGToDAGISel::getGlobalBaseReg() {
unsigned GlobalBaseReg = getInstrInfo()->getGlobalBaseReg(MF);
return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
}
/// ComplexPattern used on MipsInstrInfo
/// Used on Mips Load/Store instructions
bool MipsDAGToDAGISel::
SelectAddr(SDNode *Op, SDValue Addr, SDValue &Offset, SDValue &Base)
{
// if Address is FI, get the TargetFrameIndex.
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
Offset = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
// on PIC code Load GA
if (TM.getRelocationModel() == Reloc::PIC_) {
if ((Addr.getOpcode() == ISD::TargetGlobalAddress) ||
(Addr.getOpcode() == ISD::TargetConstantPool) ||
(Addr.getOpcode() == ISD::TargetJumpTable)){
Base = CurDAG->getRegister(Mips::GP, MVT::i32);
Offset = Addr;
return true;
}
} else {
if ((Addr.getOpcode() == ISD::TargetExternalSymbol ||
Addr.getOpcode() == ISD::TargetGlobalAddress))
return false;
}
// Operand is a result from an ADD.
if (Addr.getOpcode() == ISD::ADD) {
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
if (Predicate_immSExt16(CN)) {
// If the first operand is a FI, get the TargetFI Node
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>
(Addr.getOperand(0))) {
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
} else {
Base = Addr.getOperand(0);
}
Offset = CurDAG->getTargetConstant(CN->getZExtValue(), MVT::i32);
return true;
}
}
// When loading from constant pools, load the lower address part in
// the instruction itself. Example, instead of:
// lui $2, %hi($CPI1_0)
// addiu $2, $2, %lo($CPI1_0)
// lwc1 $f0, 0($2)
// Generate:
// lui $2, %hi($CPI1_0)
// lwc1 $f0, %lo($CPI1_0)($2)
if ((Addr.getOperand(0).getOpcode() == MipsISD::Hi ||
Addr.getOperand(0).getOpcode() == ISD::LOAD) &&
Addr.getOperand(1).getOpcode() == MipsISD::Lo) {
SDValue LoVal = Addr.getOperand(1);
if (dyn_cast<ConstantPoolSDNode>(LoVal.getOperand(0))) {
Base = Addr.getOperand(0);
Offset = LoVal.getOperand(0);
return true;
}
}
}
Base = Addr;
Offset = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
SDNode *MipsDAGToDAGISel::SelectLoadFp64(SDNode *N) {
MVT::SimpleValueType NVT =
N->getValueType(0).getSimpleVT().SimpleTy;
if (!Subtarget.isMips1() || NVT != MVT::f64)
return NULL;
if (!Predicate_unindexedload(N) ||
!Predicate_load(N))
return NULL;
SDValue Chain = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue Offset0, Offset1, Base;
if (!SelectAddr(N, N1, Offset0, Base) ||
N1.getValueType() != MVT::i32)
return NULL;
MachineSDNode::mmo_iterator MemRefs0 = MF->allocateMemRefsArray(1);
MemRefs0[0] = cast<MemSDNode>(N)->getMemOperand();
DebugLoc dl = N->getDebugLoc();
// The second load should start after for 4 bytes.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Offset0))
Offset1 = CurDAG->getTargetConstant(C->getSExtValue()+4, MVT::i32);
else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Offset0))
Offset1 = CurDAG->getTargetConstantPool(CP->getConstVal(),
MVT::i32,
CP->getAlignment(),
CP->getOffset()+4,
CP->getTargetFlags());
else
return NULL;
// Choose the offsets depending on the endianess
if (TM.getTargetData()->isBigEndian())
std::swap(Offset0, Offset1);
// Instead of:
// ldc $f0, X($3)
// Generate:
// lwc $f0, X($3)
// lwc $f1, X+4($3)
SDNode *LD0 = CurDAG->getMachineNode(Mips::LWC1, dl, MVT::f32,
MVT::Other, Offset0, Base, Chain);
SDValue Undef = SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF,
dl, NVT), 0);
SDValue I0 = CurDAG->getTargetInsertSubreg(Mips::SUBREG_FPEVEN, dl,
MVT::f64, Undef, SDValue(LD0, 0));
SDNode *LD1 = CurDAG->getMachineNode(Mips::LWC1, dl, MVT::f32,
MVT::Other, Offset1, Base, SDValue(LD0, 1));
SDValue I1 = CurDAG->getTargetInsertSubreg(Mips::SUBREG_FPODD, dl,
MVT::f64, I0, SDValue(LD1, 0));
ReplaceUses(SDValue(N, 0), I1);
ReplaceUses(SDValue(N, 1), Chain);
cast<MachineSDNode>(LD0)->setMemRefs(MemRefs0, MemRefs0 + 1);
cast<MachineSDNode>(LD1)->setMemRefs(MemRefs0, MemRefs0 + 1);
return I1.getNode();
}
SDNode *MipsDAGToDAGISel::SelectStoreFp64(SDNode *N) {
if (!Subtarget.isMips1() ||
N->getOperand(1).getValueType() != MVT::f64)
return NULL;
SDValue Chain = N->getOperand(0);
if (!Predicate_unindexedstore(N) ||
!Predicate_store(N))
return NULL;
SDValue N1 = N->getOperand(1);
SDValue N2 = N->getOperand(2);
SDValue Offset0, Offset1, Base;
if (!SelectAddr(N, N2, Offset0, Base) ||
N1.getValueType() != MVT::f64 ||
N2.getValueType() != MVT::i32)
return NULL;
MachineSDNode::mmo_iterator MemRefs0 = MF->allocateMemRefsArray(1);
MemRefs0[0] = cast<MemSDNode>(N)->getMemOperand();
DebugLoc dl = N->getDebugLoc();
// Get the even and odd part from the f64 register
SDValue FPOdd = CurDAG->getTargetExtractSubreg(Mips::SUBREG_FPODD,
dl, MVT::f32, N1);
SDValue FPEven = CurDAG->getTargetExtractSubreg(Mips::SUBREG_FPEVEN,
dl, MVT::f32, N1);
// The second store should start after for 4 bytes.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Offset0))
Offset1 = CurDAG->getTargetConstant(C->getSExtValue()+4, MVT::i32);
else
return NULL;
// Choose the offsets depending on the endianess
if (TM.getTargetData()->isBigEndian())
std::swap(Offset0, Offset1);
// Instead of:
// sdc $f0, X($3)
// Generate:
// swc $f0, X($3)
// swc $f1, X+4($3)
SDValue Ops0[] = { FPEven, Offset0, Base, Chain };
Chain = SDValue(CurDAG->getMachineNode(Mips::SWC1, dl,
MVT::Other, Ops0, 4), 0);
cast<MachineSDNode>(Chain.getNode())->setMemRefs(MemRefs0, MemRefs0 + 1);
SDValue Ops1[] = { FPOdd, Offset1, Base, Chain };
Chain = SDValue(CurDAG->getMachineNode(Mips::SWC1, dl,
MVT::Other, Ops1, 4), 0);
cast<MachineSDNode>(Chain.getNode())->setMemRefs(MemRefs0, MemRefs0 + 1);
ReplaceUses(SDValue(N, 0), Chain);
return Chain.getNode();
}
/// Select instructions not customized! Used for
/// expanded, promoted and normal instructions
SDNode* MipsDAGToDAGISel::Select(SDNode *Node) {
unsigned Opcode = Node->getOpcode();
DebugLoc dl = Node->getDebugLoc();
// Dump information about the Node being selected
DEBUG(errs() << "Selecting: "; Node->dump(CurDAG); errs() << "\n");
// If we have a custom node, we already have selected!
if (Node->isMachineOpcode()) {
DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
return NULL;
}
///
// Instruction Selection not handled by the auto-generated
// tablegen selection should be handled here.
///
switch(Opcode) {
default: break;
case ISD::SUBE:
case ISD::ADDE: {
SDValue InFlag = Node->getOperand(2), CmpLHS;
unsigned Opc = InFlag.getOpcode(); Opc=Opc;
assert(((Opc == ISD::ADDC || Opc == ISD::ADDE) ||
(Opc == ISD::SUBC || Opc == ISD::SUBE)) &&
"(ADD|SUB)E flag operand must come from (ADD|SUB)C/E insn");
unsigned MOp;
if (Opcode == ISD::ADDE) {
CmpLHS = InFlag.getValue(0);
MOp = Mips::ADDu;
} else {
CmpLHS = InFlag.getOperand(0);
MOp = Mips::SUBu;
}
SDValue Ops[] = { CmpLHS, InFlag.getOperand(1) };
SDValue LHS = Node->getOperand(0);
SDValue RHS = Node->getOperand(1);
EVT VT = LHS.getValueType();
SDNode *Carry = CurDAG->getMachineNode(Mips::SLTu, dl, VT, Ops, 2);
SDNode *AddCarry = CurDAG->getMachineNode(Mips::ADDu, dl, VT,
SDValue(Carry,0), RHS);
return CurDAG->SelectNodeTo(Node, MOp, VT, MVT::Flag,
LHS, SDValue(AddCarry,0));
}
/// Mul/Div with two results
case ISD::SDIVREM:
case ISD::UDIVREM:
case ISD::SMUL_LOHI:
case ISD::UMUL_LOHI: {
SDValue Op1 = Node->getOperand(0);
SDValue Op2 = Node->getOperand(1);
unsigned Op;
if (Opcode == ISD::UMUL_LOHI || Opcode == ISD::SMUL_LOHI)
Op = (Opcode == ISD::UMUL_LOHI ? Mips::MULTu : Mips::MULT);
else
Op = (Opcode == ISD::UDIVREM ? Mips::DIVu : Mips::DIV);
SDNode *MulDiv = CurDAG->getMachineNode(Op, dl, MVT::Flag, Op1, Op2);
SDValue InFlag = SDValue(MulDiv, 0);
SDNode *Lo = CurDAG->getMachineNode(Mips::MFLO, dl, MVT::i32,
MVT::Flag, InFlag);
InFlag = SDValue(Lo,1);
SDNode *Hi = CurDAG->getMachineNode(Mips::MFHI, dl, MVT::i32, InFlag);
if (!SDValue(Node, 0).use_empty())
ReplaceUses(SDValue(Node, 0), SDValue(Lo,0));
if (!SDValue(Node, 1).use_empty())
ReplaceUses(SDValue(Node, 1), SDValue(Hi,0));
return NULL;
}
/// Special Muls
case ISD::MUL:
case ISD::MULHS:
case ISD::MULHU: {
SDValue MulOp1 = Node->getOperand(0);
SDValue MulOp2 = Node->getOperand(1);
unsigned MulOp = (Opcode == ISD::MULHU ? Mips::MULTu : Mips::MULT);
SDNode *MulNode = CurDAG->getMachineNode(MulOp, dl,
MVT::Flag, MulOp1, MulOp2);
SDValue InFlag = SDValue(MulNode, 0);
if (Opcode == ISD::MUL)
return CurDAG->getMachineNode(Mips::MFLO, dl, MVT::i32, InFlag);
else
return CurDAG->getMachineNode(Mips::MFHI, dl, MVT::i32, InFlag);
}
/// Div/Rem operations
case ISD::SREM:
case ISD::UREM:
case ISD::SDIV:
case ISD::UDIV: {
SDValue Op1 = Node->getOperand(0);
SDValue Op2 = Node->getOperand(1);
unsigned Op, MOp;
if (Opcode == ISD::SDIV || Opcode == ISD::UDIV) {
Op = (Opcode == ISD::SDIV ? Mips::DIV : Mips::DIVu);
MOp = Mips::MFLO;
} else {
Op = (Opcode == ISD::SREM ? Mips::DIV : Mips::DIVu);
MOp = Mips::MFHI;
}
SDNode *Node = CurDAG->getMachineNode(Op, dl, MVT::Flag, Op1, Op2);
SDValue InFlag = SDValue(Node, 0);
return CurDAG->getMachineNode(MOp, dl, MVT::i32, InFlag);
}
// Get target GOT address.
case ISD::GLOBAL_OFFSET_TABLE:
return getGlobalBaseReg();
case ISD::ConstantFP: {
ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(Node);
if (Node->getValueType(0) == MVT::f64 && CN->isExactlyValue(+0.0)) {
SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
Mips::ZERO, MVT::i32);
SDValue Undef = SDValue(
CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF, dl, MVT::f64), 0);
SDNode *MTC = CurDAG->getMachineNode(Mips::MTC1, dl, MVT::f32, Zero);
SDValue I0 = CurDAG->getTargetInsertSubreg(Mips::SUBREG_FPEVEN, dl,
MVT::f64, Undef, SDValue(MTC, 0));
SDValue I1 = CurDAG->getTargetInsertSubreg(Mips::SUBREG_FPODD, dl,
MVT::f64, I0, SDValue(MTC, 0));
ReplaceUses(SDValue(Node, 0), I1);
return I1.getNode();
}
break;
}
case ISD::LOAD:
if (SDNode *ResNode = SelectLoadFp64(Node))
return ResNode;
// Other cases are autogenerated.
break;
case ISD::STORE:
if (SDNode *ResNode = SelectStoreFp64(Node))
return ResNode;
// Other cases are autogenerated.
break;
/// Handle direct and indirect calls when using PIC. On PIC, when
/// GOT is smaller than about 64k (small code) the GA target is
/// loaded with only one instruction. Otherwise GA's target must
/// be loaded with 3 instructions.
case MipsISD::JmpLink: {
if (TM.getRelocationModel() == Reloc::PIC_) {
unsigned LastOpNum = Node->getNumOperands()-1;
SDValue Chain = Node->getOperand(0);
SDValue Callee = Node->getOperand(1);
SDValue InFlag;
// Skip the incomming flag if present
if (Node->getOperand(LastOpNum).getValueType() == MVT::Flag)
LastOpNum--;
if ( (isa<GlobalAddressSDNode>(Callee)) ||
(isa<ExternalSymbolSDNode>(Callee)) )
{
/// Direct call for global addresses and external symbols
SDValue GPReg = CurDAG->getRegister(Mips::GP, MVT::i32);
// Use load to get GOT target
SDValue Ops[] = { Callee, GPReg, Chain };
SDValue Load = SDValue(CurDAG->getMachineNode(Mips::LW, dl, MVT::i32,
MVT::Other, Ops, 3), 0);
Chain = Load.getValue(1);
// Call target must be on T9
Chain = CurDAG->getCopyToReg(Chain, dl, Mips::T9, Load, InFlag);
} else
/// Indirect call
Chain = CurDAG->getCopyToReg(Chain, dl, Mips::T9, Callee, InFlag);
// Map the JmpLink operands to JALR
SDVTList NodeTys = CurDAG->getVTList(MVT::Other, MVT::Flag);
SmallVector<SDValue, 8> Ops;
Ops.push_back(CurDAG->getRegister(Mips::T9, MVT::i32));
for (unsigned i = 2, e = LastOpNum+1; i != e; ++i)
Ops.push_back(Node->getOperand(i));
Ops.push_back(Chain);
Ops.push_back(Chain.getValue(1));
// Emit Jump and Link Register
SDNode *ResNode = CurDAG->getMachineNode(Mips::JALR, dl, NodeTys,
&Ops[0], Ops.size());
// Replace Chain and InFlag
ReplaceUses(SDValue(Node, 0), SDValue(ResNode, 0));
ReplaceUses(SDValue(Node, 1), SDValue(ResNode, 1));
return ResNode;
}
}
}
// Select the default instruction
SDNode *ResNode = SelectCode(Node);
DEBUG(errs() << "=> ");
if (ResNode == NULL || ResNode == Node)
DEBUG(Node->dump(CurDAG));
else
DEBUG(ResNode->dump(CurDAG));
DEBUG(errs() << "\n");
return ResNode;
}
/// createMipsISelDag - This pass converts a legalized DAG into a
/// MIPS-specific DAG, ready for instruction scheduling.
FunctionPass *llvm::createMipsISelDag(MipsTargetMachine &TM) {
return new MipsDAGToDAGISel(TM);
}
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