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Create a new InstrEmitter class for translating SelectionDAG nodes

Browse Source 
into MachineInstrs. This is mostly just moving the code from
ScheduleDAGSDNodesEmit.cpp into a new class. This decouples MachineInstr
emitting from scheduling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83699 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-10-10 01:32:21 +00:00
parent c81b783e27
commit bcea859fc1
5 changed files with 263 additions and 183 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/CodeGen/SelectionDAG/CMakeLists.txt
View File

@ -2,6 +2,7 @@ add_llvm_library(LLVMSelectionDAG
CallingConvLower.cpp
DAGCombiner.cpp
FastISel.cpp
InstrEmitter.cpp
LegalizeDAG.cpp
LegalizeFloatTypes.cpp
LegalizeIntegerTypes.cpp
@ -13,7 +14,6 @@ add_llvm_library(LLVMSelectionDAG
ScheduleDAGList.cpp
ScheduleDAGRRList.cpp
ScheduleDAGSDNodes.cpp
ScheduleDAGSDNodesEmit.cpp
SelectionDAG.cpp
SelectionDAGBuild.cpp
SelectionDAGISel.cpp

197
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodesEmit.cpp → lib/CodeGen/SelectionDAG/InstrEmitter.cpp
View File

@ -1,4 +1,4 @@
//===---- ScheduleDAGEmit.cpp - Emit routines for the ScheduleDAG class ---===//
//==--- InstrEmitter.cpp - Emit MachineInstrs for the SelectionDAG class ---==//
//
// The LLVM Compiler Infrastructure
//
@ -7,13 +7,14 @@
//
//===----------------------------------------------------------------------===//
//
// This implements the Emit routines for the ScheduleDAG class, which creates
// MachineInstrs according to the computed schedule.
// This implements the Emit routines for the SelectionDAG class, which creates
// MachineInstrs based on the decisions of the SelectionDAG instruction
// selection.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "pre-RA-sched"
#include "ScheduleDAGSDNodes.h"
#define DEBUG_TYPE "instr-emitter"
#include "InstrEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
@ -29,9 +30,34 @@
#include "llvm/Support/MathExtras.h"
using namespace llvm;
/// CountResults - The results of target nodes have register or immediate
/// operands first, then an optional chain, and optional flag operands (which do
/// not go into the resulting MachineInstr).
unsigned InstrEmitter::CountResults(SDNode *Node) {
unsigned N = Node->getNumValues();
while (N && Node->getValueType(N - 1) == MVT::Flag)
--N;
if (N && Node->getValueType(N - 1) == MVT::Other)
--N; // Skip over chain result.
return N;
}
/// CountOperands - The inputs to target nodes have any actual inputs first,
/// followed by an optional chain operand, then an optional flag operand.
/// Compute the number of actual operands that will go into the resulting
/// MachineInstr.
unsigned InstrEmitter::CountOperands(SDNode *Node) {
unsigned N = Node->getNumOperands();
while (N && Node->getOperand(N - 1).getValueType() == MVT::Flag)
--N;
if (N && Node->getOperand(N - 1).getValueType() == MVT::Other)
--N; // Ignore chain if it exists.
return N;
}
/// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
/// implicit physical register output.
void ScheduleDAGSDNodes::
void InstrEmitter::
EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
unsigned SrcReg, DenseMap<SDValue, unsigned> &VRBaseMap) {
unsigned VRBase = 0;
@ -101,7 +127,7 @@ EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
// Figure out the register class to create for the destreg.
if (VRBase) {
DstRC = MRI.getRegClass(VRBase);
DstRC = MRI->getRegClass(VRBase);
} else if (UseRC) {
assert(UseRC->hasType(VT) && "Incompatible phys register def and uses!");
DstRC = UseRC;
@ -115,8 +141,8 @@ EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
VRBase = SrcReg;
} else {
// Create the reg, emit the copy.
VRBase = MRI.createVirtualRegister(DstRC);
bool Emitted = TII->copyRegToReg(*BB, InsertPos, VRBase, SrcReg,
VRBase = MRI->createVirtualRegister(DstRC);
bool Emitted = TII->copyRegToReg(*MBB, InsertPos, VRBase, SrcReg,
DstRC, SrcRC);
assert(Emitted && "Unable to issue a copy instruction!\n");
@ -133,8 +159,8 @@ EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
/// getDstOfCopyToRegUse - If the only use of the specified result number of
/// node is a CopyToReg, return its destination register. Return 0 otherwise.
unsigned ScheduleDAGSDNodes::getDstOfOnlyCopyToRegUse(SDNode *Node,
unsigned ResNo) const {
unsigned InstrEmitter::getDstOfOnlyCopyToRegUse(SDNode *Node,
unsigned ResNo) const {
if (!Node->hasOneUse())
return 0;
@ -149,7 +175,7 @@ unsigned ScheduleDAGSDNodes::getDstOfOnlyCopyToRegUse(SDNode *Node,
return 0;
}
void ScheduleDAGSDNodes::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
void InstrEmitter::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
const TargetInstrDesc &II,
bool IsClone, bool IsCloned,
DenseMap<SDValue, unsigned> &VRBaseMap) {
@ -179,7 +205,7 @@ void ScheduleDAGSDNodes::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
User->getOperand(2).getResNo() == i) {
unsigned Reg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
if (TargetRegisterInfo::isVirtualRegister(Reg)) {
const TargetRegisterClass *RegRC = MRI.getRegClass(Reg);
const TargetRegisterClass *RegRC = MRI->getRegClass(Reg);
if (RegRC == RC) {
VRBase = Reg;
MI->addOperand(MachineOperand::CreateReg(Reg, true));
@ -193,7 +219,7 @@ void ScheduleDAGSDNodes::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
// the machine instruction.
if (VRBase == 0) {
assert(RC && "Isn't a register operand!");
VRBase = MRI.createVirtualRegister(RC);
VRBase = MRI->createVirtualRegister(RC);
MI->addOperand(MachineOperand::CreateReg(VRBase, true));
}
@ -208,8 +234,8 @@ void ScheduleDAGSDNodes::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
/// getVR - Return the virtual register corresponding to the specified result
/// of the specified node.
unsigned ScheduleDAGSDNodes::getVR(SDValue Op,
DenseMap<SDValue, unsigned> &VRBaseMap) {
unsigned InstrEmitter::getVR(SDValue Op,
DenseMap<SDValue, unsigned> &VRBaseMap) {
if (Op.isMachineOpcode() &&
Op.getMachineOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
// Add an IMPLICIT_DEF instruction before every use.
@ -218,9 +244,10 @@ unsigned ScheduleDAGSDNodes::getVR(SDValue Op,
// does not include operand register class info.
if (!VReg) {
const TargetRegisterClass *RC = TLI->getRegClassFor(Op.getValueType());
VReg = MRI.createVirtualRegister(RC);
VReg = MRI->createVirtualRegister(RC);
}
BuildMI(BB, Op.getDebugLoc(), TII->get(TargetInstrInfo::IMPLICIT_DEF),VReg);
BuildMI(MBB, Op.getDebugLoc(),
TII->get(TargetInstrInfo::IMPLICIT_DEF), VReg);
return VReg;
}
@ -234,10 +261,10 @@ unsigned ScheduleDAGSDNodes::getVR(SDValue Op,
/// specified machine instr. Insert register copies if the register is
/// not in the required register class.
void
ScheduleDAGSDNodes::AddRegisterOperand(MachineInstr *MI, SDValue Op,
unsigned IIOpNum,
const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap) {
InstrEmitter::AddRegisterOperand(MachineInstr *MI, SDValue Op,
unsigned IIOpNum,
const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap) {
assert(Op.getValueType() != MVT::Other &&
Op.getValueType() != MVT::Flag &&
"Chain and flag operands should occur at end of operand list!");
@ -252,15 +279,15 @@ ScheduleDAGSDNodes::AddRegisterOperand(MachineInstr *MI, SDValue Op,
// If the instruction requires a register in a different class, create
// a new virtual register and copy the value into it.
if (II) {
const TargetRegisterClass *SrcRC = MRI.getRegClass(VReg);
const TargetRegisterClass *SrcRC = MRI->getRegClass(VReg);
const TargetRegisterClass *DstRC = 0;
if (IIOpNum < II->getNumOperands())
DstRC = II->OpInfo[IIOpNum].getRegClass(TRI);
assert((DstRC || (TID.isVariadic() && IIOpNum >= TID.getNumOperands())) &&
"Don't have operand info for this instruction!");
if (DstRC && SrcRC != DstRC && !SrcRC->hasSuperClass(DstRC)) {
unsigned NewVReg = MRI.createVirtualRegister(DstRC);
bool Emitted = TII->copyRegToReg(*BB, InsertPos, NewVReg, VReg,
unsigned NewVReg = MRI->createVirtualRegister(DstRC);
bool Emitted = TII->copyRegToReg(*MBB, InsertPos, NewVReg, VReg,
DstRC, SrcRC);
assert(Emitted && "Unable to issue a copy instruction!\n");
(void) Emitted;
@ -275,10 +302,10 @@ ScheduleDAGSDNodes::AddRegisterOperand(MachineInstr *MI, SDValue Op,
/// specifies the instruction information for the node, and IIOpNum is the
/// operand number (in the II) that we are adding. IIOpNum and II are used for
/// assertions only.
void ScheduleDAGSDNodes::AddOperand(MachineInstr *MI, SDValue Op,
unsigned IIOpNum,
const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap) {
void InstrEmitter::AddOperand(MachineInstr *MI, SDValue Op,
unsigned IIOpNum,
const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap) {
if (Op.isMachineOpcode()) {
AddRegisterOperand(MI, Op, IIOpNum, II, VRBaseMap);
} else if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
@ -304,18 +331,19 @@ void ScheduleDAGSDNodes::AddOperand(MachineInstr *MI, SDValue Op,
const Type *Type = CP->getType();
// MachineConstantPool wants an explicit alignment.
if (Align == 0) {
Align = TM.getTargetData()->getPrefTypeAlignment(Type);
Align = TM->getTargetData()->getPrefTypeAlignment(Type);
if (Align == 0) {
// Alignment of vector types. FIXME!
Align = TM.getTargetData()->getTypeAllocSize(Type);
Align = TM->getTargetData()->getTypeAllocSize(Type);
}
}
unsigned Idx;
MachineConstantPool *MCP = MF->getConstantPool();
if (CP->isMachineConstantPoolEntry())
Idx = ConstPool->getConstantPoolIndex(CP->getMachineCPVal(), Align);
Idx = MCP->getConstantPoolIndex(CP->getMachineCPVal(), Align);
else
Idx = ConstPool->getConstantPoolIndex(CP->getConstVal(), Align);
Idx = MCP->getConstantPoolIndex(CP->getConstVal(), Align);
MI->addOperand(MachineOperand::CreateCPI(Idx, Offset,
CP->getTargetFlags()));
} else if (ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(Op)) {
@ -346,8 +374,8 @@ getSuperRegisterRegClass(const TargetRegisterClass *TRC,
/// EmitSubregNode - Generate machine code for subreg nodes.
///
void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
DenseMap<SDValue, unsigned> &VRBaseMap){
void InstrEmitter::EmitSubregNode(SDNode *Node,
DenseMap<SDValue, unsigned> &VRBaseMap){
unsigned VRBase = 0;
unsigned Opc = Node->getMachineOpcode();
@ -370,12 +398,12 @@ void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
unsigned SubIdx = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
// Create the extract_subreg machine instruction.
MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(),
MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(),
TII->get(TargetInstrInfo::EXTRACT_SUBREG));
// Figure out the register class to create for the destreg.
unsigned VReg = getVR(Node->getOperand(0), VRBaseMap);
const TargetRegisterClass *TRC = MRI.getRegClass(VReg);
const TargetRegisterClass *TRC = MRI->getRegClass(VReg);
const TargetRegisterClass *SRC = TRC->getSubRegisterRegClass(SubIdx);
assert(SRC && "Invalid subregister index in EXTRACT_SUBREG");
@ -383,17 +411,17 @@ void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
// Note that if we're going to directly use an existing register,
// it must be precisely the required class, and not a subclass
// thereof.
if (VRBase == 0 || SRC != MRI.getRegClass(VRBase)) {
if (VRBase == 0 || SRC != MRI->getRegClass(VRBase)) {
// Create the reg
assert(SRC && "Couldn't find source register class");
VRBase = MRI.createVirtualRegister(SRC);
VRBase = MRI->createVirtualRegister(SRC);
}
// Add def, source, and subreg index
MI->addOperand(MachineOperand::CreateReg(VRBase, true));
AddOperand(MI, Node->getOperand(0), 0, 0, VRBaseMap);
MI->addOperand(MachineOperand::CreateImm(SubIdx));
BB->insert(InsertPos, MI);
MBB->insert(InsertPos, MI);
} else if (Opc == TargetInstrInfo::INSERT_SUBREG ||
Opc == TargetInstrInfo::SUBREG_TO_REG) {
SDValue N0 = Node->getOperand(0);
@ -401,7 +429,7 @@ void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
SDValue N2 = Node->getOperand(2);
unsigned SubReg = getVR(N1, VRBaseMap);
unsigned SubIdx = cast<ConstantSDNode>(N2)->getZExtValue();
const TargetRegisterClass *TRC = MRI.getRegClass(SubReg);
const TargetRegisterClass *TRC = MRI->getRegClass(SubReg);
const TargetRegisterClass *SRC =
getSuperRegisterRegClass(TRC, SubIdx,
Node->getValueType(0));
@ -410,14 +438,14 @@ void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
// Note that if we're going to directly use an existing register,
// it must be precisely the required class, and not a subclass
// thereof.
if (VRBase == 0 || SRC != MRI.getRegClass(VRBase)) {
if (VRBase == 0 || SRC != MRI->getRegClass(VRBase)) {
// Create the reg
assert(SRC && "Couldn't find source register class");
VRBase = MRI.createVirtualRegister(SRC);
VRBase = MRI->createVirtualRegister(SRC);
}
// Create the insert_subreg or subreg_to_reg machine instruction.
MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(), TII->get(Opc));
MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(), TII->get(Opc));
MI->addOperand(MachineOperand::CreateReg(VRBase, true));
// If creating a subreg_to_reg, then the first input operand
@ -430,7 +458,7 @@ void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
// Add the subregster being inserted
AddOperand(MI, N1, 0, 0, VRBaseMap);
MI->addOperand(MachineOperand::CreateImm(SubIdx));
BB->insert(InsertPos, MI);
MBB->insert(InsertPos, MI);
} else
llvm_unreachable("Node is not insert_subreg, extract_subreg, or subreg_to_reg");
@ -445,17 +473,17 @@ void ScheduleDAGSDNodes::EmitSubregNode(SDNode *Node,
/// register is constrained to be in a particular register class.
///
void
ScheduleDAGSDNodes::EmitCopyToRegClassNode(SDNode *Node,
DenseMap<SDValue, unsigned> &VRBaseMap) {
InstrEmitter::EmitCopyToRegClassNode(SDNode *Node,
DenseMap<SDValue, unsigned> &VRBaseMap) {
unsigned VReg = getVR(Node->getOperand(0), VRBaseMap);
const TargetRegisterClass *SrcRC = MRI.getRegClass(VReg);
const TargetRegisterClass *SrcRC = MRI->getRegClass(VReg);
unsigned DstRCIdx = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
const TargetRegisterClass *DstRC = TRI->getRegClass(DstRCIdx);
// Create the new VReg in the destination class and emit a copy.
unsigned NewVReg = MRI.createVirtualRegister(DstRC);
bool Emitted = TII->copyRegToReg(*BB, InsertPos, NewVReg, VReg,
unsigned NewVReg = MRI->createVirtualRegister(DstRC);
bool Emitted = TII->copyRegToReg(*MBB, InsertPos, NewVReg, VReg,
DstRC, SrcRC);
assert(Emitted &&
"Unable to issue a copy instruction for a COPY_TO_REGCLASS node!\n");
@ -469,8 +497,8 @@ ScheduleDAGSDNodes::EmitCopyToRegClassNode(SDNode *Node,
/// EmitNode - Generate machine code for an node and needed dependencies.
///
void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
DenseMap<SDValue, unsigned> &VRBaseMap,
void InstrEmitter::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
DenseMap<SDValue, unsigned> &VRBaseMap,
DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) {
// If machine instruction
if (Node->isMachineOpcode()) {
@ -507,7 +535,7 @@ void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
#endif
// Create the new machine instruction.
MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(), II);
MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(), II);
// Add result register values for things that are defined by this
// instruction.
@ -531,10 +559,10 @@ void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
if (II.usesCustomDAGSchedInsertionHook()) {
// Insert this instruction into the basic block using a target
// specific inserter which may returns a new basic block.
BB = TLI->EmitInstrWithCustomInserter(MI, BB, EM);
InsertPos = BB->end();
MBB = TLI->EmitInstrWithCustomInserter(MI, MBB, EM);
InsertPos = MBB->end();
} else {
BB->insert(InsertPos, MI);
MBB->insert(InsertPos, MI);
}
// Additional results must be an physical register def.
@ -551,7 +579,7 @@ void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
switch (Node->getOpcode()) {
default:
#ifndef NDEBUG
Node->dump(DAG);
Node->dump();
#endif
llvm_unreachable("This target-independent node should have been selected!");
break;
@ -576,17 +604,17 @@ void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
const TargetRegisterClass *SrcTRC = 0, *DstTRC = 0;
// Get the register classes of the src/dst.
if (TargetRegisterInfo::isVirtualRegister(SrcReg))
SrcTRC = MRI.getRegClass(SrcReg);
SrcTRC = MRI->getRegClass(SrcReg);
else
SrcTRC = TRI->getPhysicalRegisterRegClass(SrcReg,SrcVal.getValueType());
if (TargetRegisterInfo::isVirtualRegister(DestReg))
DstTRC = MRI.getRegClass(DestReg);
DstTRC = MRI->getRegClass(DestReg);
else
DstTRC = TRI->getPhysicalRegisterRegClass(DestReg,
Node->getOperand(1).getValueType());
bool Emitted = TII->copyRegToReg(*BB, InsertPos, DestReg, SrcReg,
bool Emitted = TII->copyRegToReg(*MBB, InsertPos, DestReg, SrcReg,
DstTRC, SrcTRC);
assert(Emitted && "Unable to issue a copy instruction!\n");
(void) Emitted;
@ -603,7 +631,7 @@ void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
--NumOps; // Ignore the flag operand.
// Create the inline asm machine instruction.
MachineInstr *MI = BuildMI(MF, Node->getDebugLoc(),
MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(),
TII->get(TargetInstrInfo::INLINEASM));
// Add the asm string as an external symbol operand.
@ -645,44 +673,21 @@ void ScheduleDAGSDNodes::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
break;
}
}
BB->insert(InsertPos, MI);
MBB->insert(InsertPos, MI);
break;
}
}
}
/// EmitSchedule - Emit the machine code in scheduled order.
MachineBasicBlock *ScheduleDAGSDNodes::
EmitSchedule(DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) {
DenseMap<SDValue, unsigned> VRBaseMap;
DenseMap<SUnit*, unsigned> CopyVRBaseMap;
for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
SUnit *SU = Sequence[i];
if (!SU) {
// Null SUnit* is a noop.
EmitNoop();
continue;
}
// For pre-regalloc scheduling, create instructions corresponding to the
// SDNode and any flagged SDNodes and append them to the block.
if (!SU->getNode()) {
// Emit a copy.
EmitPhysRegCopy(SU, CopyVRBaseMap);
continue;
}
SmallVector<SDNode *, 4> FlaggedNodes;
for (SDNode *N = SU->getNode()->getFlaggedNode(); N;
N = N->getFlaggedNode())
FlaggedNodes.push_back(N);
while (!FlaggedNodes.empty()) {
EmitNode(FlaggedNodes.back(), SU->OrigNode != SU, SU->isCloned,
VRBaseMap, EM);
FlaggedNodes.pop_back();
}
EmitNode(SU->getNode(), SU->OrigNode != SU, SU->isCloned, VRBaseMap, EM);
}
return BB;
/// InstrEmitter - Construct an InstrEmitter and set it to start inserting
/// at the given position in the given block.
InstrEmitter::InstrEmitter(MachineBasicBlock *mbb,
MachineBasicBlock::iterator insertpos)
: MF(mbb->getParent()),
MRI(&MF->getRegInfo()),
TM(&MF->getTarget()),
TII(TM->getInstrInfo()),
TRI(TM->getRegisterInfo()),
TLI(TM->getTargetLowering()),
MBB(mbb), InsertPos(insertpos) {
}

119
lib/CodeGen/SelectionDAG/InstrEmitter.h Normal file
View File

@ -0,0 +1,119 @@
//===---- InstrEmitter.h - Emit MachineInstrs for the SelectionDAG class ---==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This declares the Emit routines for the SelectionDAG class, which creates
// MachineInstrs based on the decisions of the SelectionDAG instruction
// selection.
//
//===----------------------------------------------------------------------===//
#ifndef INSTREMITTER_H
#define INSTREMITTER_H
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/ADT/DenseMap.h"
namespace llvm {
class TargetInstrDesc;
class InstrEmitter {
MachineFunction *MF;
MachineRegisterInfo *MRI;
const TargetMachine *TM;
const TargetInstrInfo *TII;
const TargetRegisterInfo *TRI;
const TargetLowering *TLI;
MachineBasicBlock *MBB;
MachineBasicBlock::iterator InsertPos;
/// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
/// implicit physical register output.
void EmitCopyFromReg(SDNode *Node, unsigned ResNo,
bool IsClone, bool IsCloned,
unsigned SrcReg,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// getDstOfCopyToRegUse - If the only use of the specified result number of
/// node is a CopyToReg, return its destination register. Return 0 otherwise.
unsigned getDstOfOnlyCopyToRegUse(SDNode *Node,
unsigned ResNo) const;
void CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
const TargetInstrDesc &II,
bool IsClone, bool IsCloned,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// getVR - Return the virtual register corresponding to the specified result
/// of the specified node.
unsigned getVR(SDValue Op,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// AddRegisterOperand - Add the specified register as an operand to the
/// specified machine instr. Insert register copies if the register is
/// not in the required register class.
void AddRegisterOperand(MachineInstr *MI, SDValue Op,
unsigned IIOpNum,
const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// AddOperand - Add the specified operand to the specified machine instr. II
/// specifies the instruction information for the node, and IIOpNum is the
/// operand number (in the II) that we are adding. IIOpNum and II are used for
/// assertions only.
void AddOperand(MachineInstr *MI, SDValue Op,
unsigned IIOpNum,
const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// EmitSubregNode - Generate machine code for subreg nodes.
///
void EmitSubregNode(SDNode *Node, DenseMap<SDValue, unsigned> &VRBaseMap);
/// EmitCopyToRegClassNode - Generate machine code for COPY_TO_REGCLASS nodes.
/// COPY_TO_REGCLASS is just a normal copy, except that the destination
/// register is constrained to be in a particular register class.
///
void EmitCopyToRegClassNode(SDNode *Node,
DenseMap<SDValue, unsigned> &VRBaseMap);
public:
/// CountResults - The results of target nodes have register or immediate
/// operands first, then an optional chain, and optional flag operands
/// (which do not go into the machine instrs.)
static unsigned CountResults(SDNode *Node);
/// CountOperands - The inputs to target nodes have any actual inputs first,
/// followed by an optional chain operand, then flag operands. Compute
/// the number of actual operands that will go into the resulting
/// MachineInstr.
static unsigned CountOperands(SDNode *Node);
/// EmitNode - Generate machine code for an node and needed dependencies.
///
void EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
DenseMap<SDValue, unsigned> &VRBaseMap,
DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM);
/// getBlock - Return the current basic block.
MachineBasicBlock *getBlock() { return MBB; }
/// getInsertPos - Return the current insertion position.
MachineBasicBlock::iterator getInsertPos() { return InsertPos; }
/// InstrEmitter - Construct an InstrEmitter and set it to start inserting
/// at the given position in the given block.
InstrEmitter(MachineBasicBlock *mbb, MachineBasicBlock::iterator insertpos);
};
}
#endif

68
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
View File

@ -14,6 +14,7 @@
#define DEBUG_TYPE "pre-RA-sched"
#include "ScheduleDAGSDNodes.h"
#include "InstrEmitter.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetInstrInfo.h"
@ -181,7 +182,7 @@ void ScheduleDAGSDNodes::AddSchedEdges() {
if (N->isMachineOpcode() &&
TII->get(N->getMachineOpcode()).getImplicitDefs()) {
SU->hasPhysRegClobbers = true;
unsigned NumUsed = CountResults(N);
unsigned NumUsed = InstrEmitter::CountResults(N);
while (NumUsed != 0 && !N->hasAnyUseOfValue(NumUsed - 1))
--NumUsed; // Skip over unused values at the end.
if (NumUsed > TII->get(N->getMachineOpcode()).getNumDefs())
@ -250,31 +251,6 @@ void ScheduleDAGSDNodes::ComputeLatency(SUnit *SU) {
}
}
/// CountResults - The results of target nodes have register or immediate
/// operands first, then an optional chain, and optional flag operands (which do
/// not go into the resulting MachineInstr).
unsigned ScheduleDAGSDNodes::CountResults(SDNode *Node) {
unsigned N = Node->getNumValues();
while (N && Node->getValueType(N - 1) == MVT::Flag)
--N;
if (N && Node->getValueType(N - 1) == MVT::Other)
--N; // Skip over chain result.
return N;
}
/// CountOperands - The inputs to target nodes have any actual inputs first,
/// followed by an optional chain operand, then an optional flag operand.
/// Compute the number of actual operands that will go into the resulting
/// MachineInstr.
unsigned ScheduleDAGSDNodes::CountOperands(SDNode *Node) {
unsigned N = Node->getNumOperands();
while (N && Node->getOperand(N - 1).getValueType() == MVT::Flag)
--N;
if (N && Node->getOperand(N - 1).getValueType() == MVT::Other)
--N; // Ignore chain if it exists.
return N;
}
void ScheduleDAGSDNodes::dumpNode(const SUnit *SU) const {
if (!SU->getNode()) {
errs() << "PHYS REG COPY\n";
@ -293,3 +269,43 @@ void ScheduleDAGSDNodes::dumpNode(const SUnit *SU) const {
FlaggedNodes.pop_back();
}
}
/// EmitSchedule - Emit the machine code in scheduled order.
MachineBasicBlock *ScheduleDAGSDNodes::
EmitSchedule(DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) {
InstrEmitter Emitter(BB, InsertPos);
DenseMap<SDValue, unsigned> VRBaseMap;
DenseMap<SUnit*, unsigned> CopyVRBaseMap;
for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
SUnit *SU = Sequence[i];
if (!SU) {
// Null SUnit* is a noop.
EmitNoop();
continue;
}
// For pre-regalloc scheduling, create instructions corresponding to the
// SDNode and any flagged SDNodes and append them to the block.
if (!SU->getNode()) {
// Emit a copy.
EmitPhysRegCopy(SU, CopyVRBaseMap);
continue;
}
SmallVector<SDNode *, 4> FlaggedNodes;
for (SDNode *N = SU->getNode()->getFlaggedNode(); N;
N = N->getFlaggedNode())
FlaggedNodes.push_back(N);
while (!FlaggedNodes.empty()) {
Emitter.EmitNode(FlaggedNodes.back(), SU->OrigNode != SU, SU->isCloned,
VRBaseMap, EM);
FlaggedNodes.pop_back();
}
Emitter.EmitNode(SU->getNode(), SU->OrigNode != SU, SU->isCloned,
VRBaseMap, EM);
}
BB = Emitter.getBlock();
InsertPos = Emitter.getInsertPos();
return BB;
}

60
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h
View File

@ -92,25 +92,6 @@ namespace llvm {
///
virtual void ComputeLatency(SUnit *SU);
/// CountResults - The results of target nodes have register or immediate
/// operands first, then an optional chain, and optional flag operands
/// (which do not go into the machine instrs.)
static unsigned CountResults(SDNode *Node);
/// CountOperands - The inputs to target nodes have any actual inputs first,
/// followed by an optional chain operand, then flag operands. Compute
/// the number of actual operands that will go into the resulting
/// MachineInstr.
static unsigned CountOperands(SDNode *Node);
/// EmitNode - Generate machine code for an node and needed dependencies.
/// VRBaseMap contains, for each already emitted node, the first virtual
/// register number for the results of the node.
///
void EmitNode(SDNode *Node, bool IsClone, bool HasClone,
DenseMap<SDValue, unsigned> &VRBaseMap,
DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM);
virtual MachineBasicBlock *
EmitSchedule(DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM);
@ -126,47 +107,6 @@ namespace llvm {
virtual void getCustomGraphFeatures(GraphWriter<ScheduleDAG*> &GW) const;
private:
/// EmitSubregNode - Generate machine code for subreg nodes.
///
void EmitSubregNode(SDNode *Node,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// EmitCopyToRegClassNode - Generate machine code for COPY_TO_REGCLASS
/// nodes.
///
void EmitCopyToRegClassNode(SDNode *Node,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// getVR - Return the virtual register corresponding to the specified result
/// of the specified node.
unsigned getVR(SDValue Op, DenseMap<SDValue, unsigned> &VRBaseMap);
/// getDstOfCopyToRegUse - If the only use of the specified result number of
/// node is a CopyToReg, return its destination register. Return 0 otherwise.
unsigned getDstOfOnlyCopyToRegUse(SDNode *Node, unsigned ResNo) const;
void AddOperand(MachineInstr *MI, SDValue Op, unsigned IIOpNum,
const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// AddRegisterOperand - Add the specified register as an operand to the
/// specified machine instr. Insert register copies if the register is
/// not in the required register class.
void AddRegisterOperand(MachineInstr *MI, SDValue Op,
unsigned IIOpNum, const TargetInstrDesc *II,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
/// implicit physical register output.
void EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone,
bool IsCloned, unsigned SrcReg,
DenseMap<SDValue, unsigned> &VRBaseMap);
void CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
const TargetInstrDesc &II, bool IsClone,
bool IsCloned,
DenseMap<SDValue, unsigned> &VRBaseMap);
/// BuildSchedUnits, AddSchedEdges - Helper functions for BuildSchedGraph.
void BuildSchedUnits();
void AddSchedEdges();