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llvm-mirror/lib/CodeGen/MachineInstr.cpp
Jakob Stoklund Olesen cc0cf22b98 Add an MF argument to TRI::getPointerRegClass() and TII::getRegClass(). 
The getPointerRegClass() hook can return register classes that depend on
the calling convention of the current function (ptr_rc_tailcall).

So far, we have been able to infer the calling convention from the
subtarget alone, but as we add support for multiple calling conventions
per target, that no longer works.

Patch by Yiannis Tsiouris!

llvm-svn: 156328
2012-05-07 22:10:26 +00:00

1922 lines
66 KiB
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//===-- lib/CodeGen/MachineInstr.cpp --------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Methods common to all machine instructions.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/InlineAsm.h"
#include "llvm/LLVMContext.h"
#include "llvm/Metadata.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/Value.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LeakDetector.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/Hashing.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// MachineOperand Implementation
//===----------------------------------------------------------------------===//
/// AddRegOperandToRegInfo - Add this register operand to the specified
/// MachineRegisterInfo. If it is null, then the next/prev fields should be
/// explicitly nulled out.
void MachineOperand::AddRegOperandToRegInfo(MachineRegisterInfo *RegInfo) {
assert(isReg() && "Can only add reg operand to use lists");
// If the reginfo pointer is null, just explicitly null out or next/prev
// pointers, to ensure they are not garbage.
if (RegInfo == 0) {
Contents.Reg.Prev = 0;
Contents.Reg.Next = 0;
return;
}
// Otherwise, add this operand to the head of the registers use/def list.
MachineOperand **Head = &RegInfo->getRegUseDefListHead(getReg());
// For SSA values, we prefer to keep the definition at the start of the list.
// we do this by skipping over the definition if it is at the head of the
// list.
if (*Head && (*Head)->isDef())
Head = &(*Head)->Contents.Reg.Next;
Contents.Reg.Next = *Head;
if (Contents.Reg.Next) {
assert(getReg() == Contents.Reg.Next->getReg() &&
"Different regs on the same list!");
Contents.Reg.Next->Contents.Reg.Prev = &Contents.Reg.Next;
}
Contents.Reg.Prev = Head;
*Head = this;
}
/// RemoveRegOperandFromRegInfo - Remove this register operand from the
/// MachineRegisterInfo it is linked with.
void MachineOperand::RemoveRegOperandFromRegInfo() {
assert(isOnRegUseList() && "Reg operand is not on a use list");
// Unlink this from the doubly linked list of operands.
MachineOperand *NextOp = Contents.Reg.Next;
*Contents.Reg.Prev = NextOp;
if (NextOp) {
assert(NextOp->getReg() == getReg() && "Corrupt reg use/def chain!");
NextOp->Contents.Reg.Prev = Contents.Reg.Prev;
}
Contents.Reg.Prev = 0;
Contents.Reg.Next = 0;
}
void MachineOperand::setReg(unsigned Reg) {
if (getReg() == Reg) return; // No change.
// Otherwise, we have to change the register. If this operand is embedded
// into a machine function, we need to update the old and new register's
// use/def lists.
if (MachineInstr *MI = getParent())
if (MachineBasicBlock *MBB = MI->getParent())
if (MachineFunction *MF = MBB->getParent()) {
RemoveRegOperandFromRegInfo();
SmallContents.RegNo = Reg;
AddRegOperandToRegInfo(&MF->getRegInfo());
return;
}
// Otherwise, just change the register, no problem. :)
SmallContents.RegNo = Reg;
}
void MachineOperand::substVirtReg(unsigned Reg, unsigned SubIdx,
const TargetRegisterInfo &TRI) {
assert(TargetRegisterInfo::isVirtualRegister(Reg));
if (SubIdx && getSubReg())
SubIdx = TRI.composeSubRegIndices(SubIdx, getSubReg());
setReg(Reg);
if (SubIdx)
setSubReg(SubIdx);
}
void MachineOperand::substPhysReg(unsigned Reg, const TargetRegisterInfo &TRI) {
assert(TargetRegisterInfo::isPhysicalRegister(Reg));
if (getSubReg()) {
Reg = TRI.getSubReg(Reg, getSubReg());
// Note that getSubReg() may return 0 if the sub-register doesn't exist.
// That won't happen in legal code.
setSubReg(0);
}
setReg(Reg);
}
/// ChangeToImmediate - Replace this operand with a new immediate operand of
/// the specified value. If an operand is known to be an immediate already,
/// the setImm method should be used.
void MachineOperand::ChangeToImmediate(int64_t ImmVal) {
// If this operand is currently a register operand, and if this is in a
// function, deregister the operand from the register's use/def list.
if (isReg() && getParent() && getParent()->getParent() &&
getParent()->getParent()->getParent())
RemoveRegOperandFromRegInfo();
OpKind = MO_Immediate;
Contents.ImmVal = ImmVal;
}
/// ChangeToRegister - Replace this operand with a new register operand of
/// the specified value. If an operand is known to be an register already,
/// the setReg method should be used.
void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
bool isKill, bool isDead, bool isUndef,
bool isDebug) {
// If this operand is already a register operand, use setReg to update the
// register's use/def lists.
if (isReg()) {
assert(!isEarlyClobber());
setReg(Reg);
} else {
// Otherwise, change this to a register and set the reg#.
OpKind = MO_Register;
SmallContents.RegNo = Reg;
// If this operand is embedded in a function, add the operand to the
// register's use/def list.
if (MachineInstr *MI = getParent())
if (MachineBasicBlock *MBB = MI->getParent())
if (MachineFunction *MF = MBB->getParent())
AddRegOperandToRegInfo(&MF->getRegInfo());
}
IsDef = isDef;
IsImp = isImp;
IsKill = isKill;
IsDead = isDead;
IsUndef = isUndef;
IsInternalRead = false;
IsEarlyClobber = false;
IsDebug = isDebug;
SubReg = 0;
}
/// isIdenticalTo - Return true if this operand is identical to the specified
/// operand.
bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
if (getType() != Other.getType() ||
getTargetFlags() != Other.getTargetFlags())
return false;
switch (getType()) {
case MachineOperand::MO_Register:
return getReg() == Other.getReg() && isDef() == Other.isDef() &&
getSubReg() == Other.getSubReg();
case MachineOperand::MO_Immediate:
return getImm() == Other.getImm();
case MachineOperand::MO_CImmediate:
return getCImm() == Other.getCImm();
case MachineOperand::MO_FPImmediate:
return getFPImm() == Other.getFPImm();
case MachineOperand::MO_MachineBasicBlock:
return getMBB() == Other.getMBB();
case MachineOperand::MO_FrameIndex:
return getIndex() == Other.getIndex();
case MachineOperand::MO_ConstantPoolIndex:
return getIndex() == Other.getIndex() && getOffset() == Other.getOffset();
case MachineOperand::MO_JumpTableIndex:
return getIndex() == Other.getIndex();
case MachineOperand::MO_GlobalAddress:
return getGlobal() == Other.getGlobal() && getOffset() == Other.getOffset();
case MachineOperand::MO_ExternalSymbol:
return !strcmp(getSymbolName(), Other.getSymbolName()) &&
getOffset() == Other.getOffset();
case MachineOperand::MO_BlockAddress:
return getBlockAddress() == Other.getBlockAddress();
case MO_RegisterMask:
return getRegMask() == Other.getRegMask();
case MachineOperand::MO_MCSymbol:
return getMCSymbol() == Other.getMCSymbol();
case MachineOperand::MO_Metadata:
return getMetadata() == Other.getMetadata();
}
llvm_unreachable("Invalid machine operand type");
}
/// print - Print the specified machine operand.
///
void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
// If the instruction is embedded into a basic block, we can find the
// target info for the instruction.
if (!TM)
if (const MachineInstr *MI = getParent())
if (const MachineBasicBlock *MBB = MI->getParent())
if (const MachineFunction *MF = MBB->getParent())
TM = &MF->getTarget();
const TargetRegisterInfo *TRI = TM ? TM->getRegisterInfo() : 0;
switch (getType()) {
case MachineOperand::MO_Register:
OS << PrintReg(getReg(), TRI, getSubReg());
if (isDef() || isKill() || isDead() || isImplicit() || isUndef() ||
isInternalRead() || isEarlyClobber()) {
OS << '<';
bool NeedComma = false;
if (isDef()) {
if (NeedComma) OS << ',';
if (isEarlyClobber())
OS << "earlyclobber,";
if (isImplicit())
OS << "imp-";
OS << "def";
NeedComma = true;
// <def,read-undef> only makes sense when getSubReg() is set.
// Don't clutter the output otherwise.
if (isUndef() && getSubReg())
OS << ",read-undef";
} else if (isImplicit()) {
OS << "imp-use";
NeedComma = true;
}
if (isKill() || isDead() || (isUndef() && isUse()) || isInternalRead()) {
if (NeedComma) OS << ',';
NeedComma = false;
if (isKill()) {
OS << "kill";
NeedComma = true;
}
if (isDead()) {
OS << "dead";
NeedComma = true;
}
if (isUndef() && isUse()) {
if (NeedComma) OS << ',';
OS << "undef";
NeedComma = true;
}
if (isInternalRead()) {
if (NeedComma) OS << ',';
OS << "internal";
NeedComma = true;
}
}
OS << '>';
}
break;
case MachineOperand::MO_Immediate:
OS << getImm();
break;
case MachineOperand::MO_CImmediate:
getCImm()->getValue().print(OS, false);
break;
case MachineOperand::MO_FPImmediate:
if (getFPImm()->getType()->isFloatTy())
OS << getFPImm()->getValueAPF().convertToFloat();
else
OS << getFPImm()->getValueAPF().convertToDouble();
break;
case MachineOperand::MO_MachineBasicBlock:
OS << "<BB#" << getMBB()->getNumber() << ">";
break;
case MachineOperand::MO_FrameIndex:
OS << "<fi#" << getIndex() << '>';
break;
case MachineOperand::MO_ConstantPoolIndex:
OS << "<cp#" << getIndex();
if (getOffset()) OS << "+" << getOffset();
OS << '>';
break;
case MachineOperand::MO_JumpTableIndex:
OS << "<jt#" << getIndex() << '>';
break;
case MachineOperand::MO_GlobalAddress:
OS << "<ga:";
WriteAsOperand(OS, getGlobal(), /*PrintType=*/false);
if (getOffset()) OS << "+" << getOffset();
OS << '>';
break;
case MachineOperand::MO_ExternalSymbol:
OS << "<es:" << getSymbolName();
if (getOffset()) OS << "+" << getOffset();
OS << '>';
break;
case MachineOperand::MO_BlockAddress:
OS << '<';
WriteAsOperand(OS, getBlockAddress(), /*PrintType=*/false);
OS << '>';
break;
case MachineOperand::MO_RegisterMask:
OS << "<regmask>";
break;
case MachineOperand::MO_Metadata:
OS << '<';
WriteAsOperand(OS, getMetadata(), /*PrintType=*/false);
OS << '>';
break;
case MachineOperand::MO_MCSymbol:
OS << "<MCSym=" << *getMCSymbol() << '>';
break;
}
if (unsigned TF = getTargetFlags())
OS << "[TF=" << TF << ']';
}
//===----------------------------------------------------------------------===//
// MachineMemOperand Implementation
//===----------------------------------------------------------------------===//
/// getAddrSpace - Return the LLVM IR address space number that this pointer
/// points into.
unsigned MachinePointerInfo::getAddrSpace() const {
if (V == 0) return 0;
return cast<PointerType>(V->getType())->getAddressSpace();
}
/// getConstantPool - Return a MachinePointerInfo record that refers to the
/// constant pool.
MachinePointerInfo MachinePointerInfo::getConstantPool() {
return MachinePointerInfo(PseudoSourceValue::getConstantPool());
}
/// getFixedStack - Return a MachinePointerInfo record that refers to the
/// the specified FrameIndex.
MachinePointerInfo MachinePointerInfo::getFixedStack(int FI, int64_t offset) {
return MachinePointerInfo(PseudoSourceValue::getFixedStack(FI), offset);
}
MachinePointerInfo MachinePointerInfo::getJumpTable() {
return MachinePointerInfo(PseudoSourceValue::getJumpTable());
}
MachinePointerInfo MachinePointerInfo::getGOT() {
return MachinePointerInfo(PseudoSourceValue::getGOT());
}
MachinePointerInfo MachinePointerInfo::getStack(int64_t Offset) {
return MachinePointerInfo(PseudoSourceValue::getStack(), Offset);
}
MachineMemOperand::MachineMemOperand(MachinePointerInfo ptrinfo, unsigned f,
uint64_t s, unsigned int a,
const MDNode *TBAAInfo,
const MDNode *Ranges)
: PtrInfo(ptrinfo), Size(s),
Flags((f & ((1 << MOMaxBits) - 1)) | ((Log2_32(a) + 1) << MOMaxBits)),
TBAAInfo(TBAAInfo), Ranges(Ranges) {
assert((PtrInfo.V == 0 || isa<PointerType>(PtrInfo.V->getType())) &&
"invalid pointer value");
assert(getBaseAlignment() == a && "Alignment is not a power of 2!");
assert((isLoad() || isStore()) && "Not a load/store!");
}
/// Profile - Gather unique data for the object.
///
void MachineMemOperand::Profile(FoldingSetNodeID &ID) const {
ID.AddInteger(getOffset());
ID.AddInteger(Size);
ID.AddPointer(getValue());
ID.AddInteger(Flags);
}
void MachineMemOperand::refineAlignment(const MachineMemOperand *MMO) {
// The Value and Offset may differ due to CSE. But the flags and size
// should be the same.
assert(MMO->getFlags() == getFlags() && "Flags mismatch!");
assert(MMO->getSize() == getSize() && "Size mismatch!");
if (MMO->getBaseAlignment() >= getBaseAlignment()) {
// Update the alignment value.
Flags = (Flags & ((1 << MOMaxBits) - 1)) |
((Log2_32(MMO->getBaseAlignment()) + 1) << MOMaxBits);
// Also update the base and offset, because the new alignment may
// not be applicable with the old ones.
PtrInfo = MMO->PtrInfo;
}
}
/// getAlignment - Return the minimum known alignment in bytes of the
/// actual memory reference.
uint64_t MachineMemOperand::getAlignment() const {
return MinAlign(getBaseAlignment(), getOffset());
}
raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineMemOperand &MMO) {
assert((MMO.isLoad() || MMO.isStore()) &&
"SV has to be a load, store or both.");
if (MMO.isVolatile())
OS << "Volatile ";
if (MMO.isLoad())
OS << "LD";
if (MMO.isStore())
OS << "ST";
OS << MMO.getSize();
// Print the address information.
OS << "[";
if (!MMO.getValue())
OS << "<unknown>";
else
WriteAsOperand(OS, MMO.getValue(), /*PrintType=*/false);
// If the alignment of the memory reference itself differs from the alignment
// of the base pointer, print the base alignment explicitly, next to the base
// pointer.
if (MMO.getBaseAlignment() != MMO.getAlignment())
OS << "(align=" << MMO.getBaseAlignment() << ")";
if (MMO.getOffset() != 0)
OS << "+" << MMO.getOffset();
OS << "]";
// Print the alignment of the reference.
if (MMO.getBaseAlignment() != MMO.getAlignment() ||
MMO.getBaseAlignment() != MMO.getSize())
OS << "(align=" << MMO.getAlignment() << ")";
// Print TBAA info.
if (const MDNode *TBAAInfo = MMO.getTBAAInfo()) {
OS << "(tbaa=";
if (TBAAInfo->getNumOperands() > 0)
WriteAsOperand(OS, TBAAInfo->getOperand(0), /*PrintType=*/false);
else
OS << "<unknown>";
OS << ")";
}
// Print nontemporal info.
if (MMO.isNonTemporal())
OS << "(nontemporal)";
return OS;
}
//===----------------------------------------------------------------------===//
// MachineInstr Implementation
//===----------------------------------------------------------------------===//
/// MachineInstr ctor - This constructor creates a dummy MachineInstr with
/// MCID NULL and no operands.
MachineInstr::MachineInstr()
: MCID(0), Flags(0), AsmPrinterFlags(0),
NumMemRefs(0), MemRefs(0),
Parent(0) {
// Make sure that we get added to a machine basicblock
LeakDetector::addGarbageObject(this);
}
void MachineInstr::addImplicitDefUseOperands() {
if (MCID->ImplicitDefs)
for (const uint16_t *ImpDefs = MCID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
addOperand(MachineOperand::CreateReg(*ImpDefs, true, true));
if (MCID->ImplicitUses)
for (const uint16_t *ImpUses = MCID->getImplicitUses(); *ImpUses; ++ImpUses)
addOperand(MachineOperand::CreateReg(*ImpUses, false, true));
}
/// MachineInstr ctor - This constructor creates a MachineInstr and adds the
/// implicit operands. It reserves space for the number of operands specified by
/// the MCInstrDesc.
MachineInstr::MachineInstr(const MCInstrDesc &tid, bool NoImp)
: MCID(&tid), Flags(0), AsmPrinterFlags(0),
NumMemRefs(0), MemRefs(0), Parent(0) {
unsigned NumImplicitOps = 0;
if (!NoImp)
NumImplicitOps = MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
Operands.reserve(NumImplicitOps + MCID->getNumOperands());
if (!NoImp)
addImplicitDefUseOperands();
// Make sure that we get added to a machine basicblock
LeakDetector::addGarbageObject(this);
}
/// MachineInstr ctor - As above, but with a DebugLoc.
MachineInstr::MachineInstr(const MCInstrDesc &tid, const DebugLoc dl,
bool NoImp)
: MCID(&tid), Flags(0), AsmPrinterFlags(0),
NumMemRefs(0), MemRefs(0), Parent(0), debugLoc(dl) {
unsigned NumImplicitOps = 0;
if (!NoImp)
NumImplicitOps = MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
Operands.reserve(NumImplicitOps + MCID->getNumOperands());
if (!NoImp)
addImplicitDefUseOperands();
// Make sure that we get added to a machine basicblock
LeakDetector::addGarbageObject(this);
}
/// MachineInstr ctor - Work exactly the same as the ctor two above, except
/// that the MachineInstr is created and added to the end of the specified
/// basic block.
MachineInstr::MachineInstr(MachineBasicBlock *MBB, const MCInstrDesc &tid)
: MCID(&tid), Flags(0), AsmPrinterFlags(0),
NumMemRefs(0), MemRefs(0), Parent(0) {
assert(MBB && "Cannot use inserting ctor with null basic block!");
unsigned NumImplicitOps =
MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
Operands.reserve(NumImplicitOps + MCID->getNumOperands());
addImplicitDefUseOperands();
// Make sure that we get added to a machine basicblock
LeakDetector::addGarbageObject(this);
MBB->push_back(this); // Add instruction to end of basic block!
}
/// MachineInstr ctor - As above, but with a DebugLoc.
///
MachineInstr::MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl,
const MCInstrDesc &tid)
: MCID(&tid), Flags(0), AsmPrinterFlags(0),
NumMemRefs(0), MemRefs(0), Parent(0), debugLoc(dl) {
assert(MBB && "Cannot use inserting ctor with null basic block!");
unsigned NumImplicitOps =
MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
Operands.reserve(NumImplicitOps + MCID->getNumOperands());
addImplicitDefUseOperands();
// Make sure that we get added to a machine basicblock
LeakDetector::addGarbageObject(this);
MBB->push_back(this); // Add instruction to end of basic block!
}
/// MachineInstr ctor - Copies MachineInstr arg exactly
///
MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
: MCID(&MI.getDesc()), Flags(0), AsmPrinterFlags(0),
NumMemRefs(MI.NumMemRefs), MemRefs(MI.MemRefs),
Parent(0), debugLoc(MI.getDebugLoc()) {
Operands.reserve(MI.getNumOperands());
// Add operands
for (unsigned i = 0; i != MI.getNumOperands(); ++i)
addOperand(MI.getOperand(i));
// Copy all the flags.
Flags = MI.Flags;
// Set parent to null.
Parent = 0;
LeakDetector::addGarbageObject(this);
}
MachineInstr::~MachineInstr() {
LeakDetector::removeGarbageObject(this);
#ifndef NDEBUG
for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
assert(Operands[i].ParentMI == this && "ParentMI mismatch!");
assert((!Operands[i].isReg() || !Operands[i].isOnRegUseList()) &&
"Reg operand def/use list corrupted");
}
#endif
}
/// getRegInfo - If this instruction is embedded into a MachineFunction,
/// return the MachineRegisterInfo object for the current function, otherwise
/// return null.
MachineRegisterInfo *MachineInstr::getRegInfo() {
if (MachineBasicBlock *MBB = getParent())
return &MBB->getParent()->getRegInfo();
return 0;
}
/// RemoveRegOperandsFromUseLists - Unlink all of the register operands in
/// this instruction from their respective use lists. This requires that the
/// operands already be on their use lists.
void MachineInstr::RemoveRegOperandsFromUseLists() {
for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
if (Operands[i].isReg())
Operands[i].RemoveRegOperandFromRegInfo();
}
}
/// AddRegOperandsToUseLists - Add all of the register operands in
/// this instruction from their respective use lists. This requires that the
/// operands not be on their use lists yet.
void MachineInstr::AddRegOperandsToUseLists(MachineRegisterInfo &RegInfo) {
for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
if (Operands[i].isReg())
Operands[i].AddRegOperandToRegInfo(&RegInfo);
}
}
/// addOperand - Add the specified operand to the instruction. If it is an
/// implicit operand, it is added to the end of the operand list. If it is
/// an explicit operand it is added at the end of the explicit operand list
/// (before the first implicit operand).
void MachineInstr::addOperand(const MachineOperand &Op) {
assert(MCID && "Cannot add operands before providing an instr descriptor");
bool isImpReg = Op.isReg() && Op.isImplicit();
MachineRegisterInfo *RegInfo = getRegInfo();
// If the Operands backing store is reallocated, all register operands must
// be removed and re-added to RegInfo. It is storing pointers to operands.
bool Reallocate = RegInfo &&
!Operands.empty() && Operands.size() == Operands.capacity();
// Find the insert location for the new operand. Implicit registers go at
// the end, everything goes before the implicit regs.
unsigned OpNo = Operands.size();
// Remove all the implicit operands from RegInfo if they need to be shifted.
// FIXME: Allow mixed explicit and implicit operands on inline asm.
// InstrEmitter::EmitSpecialNode() is marking inline asm clobbers as
// implicit-defs, but they must not be moved around. See the FIXME in
// InstrEmitter.cpp.
if (!isImpReg && !isInlineAsm()) {
while (OpNo && Operands[OpNo-1].isReg() && Operands[OpNo-1].isImplicit()) {
--OpNo;
if (RegInfo)
Operands[OpNo].RemoveRegOperandFromRegInfo();
}
}
// OpNo now points as the desired insertion point. Unless this is a variadic
// instruction, only implicit regs are allowed beyond MCID->getNumOperands().
assert((isImpReg || MCID->isVariadic() || OpNo < MCID->getNumOperands()) &&
"Trying to add an operand to a machine instr that is already done!");
// All operands from OpNo have been removed from RegInfo. If the Operands
// backing store needs to be reallocated, we also need to remove any other
// register operands.
if (Reallocate)
for (unsigned i = 0; i != OpNo; ++i)
if (Operands[i].isReg())
Operands[i].RemoveRegOperandFromRegInfo();
// Insert the new operand at OpNo.
Operands.insert(Operands.begin() + OpNo, Op);
Operands[OpNo].ParentMI = this;
// The Operands backing store has now been reallocated, so we can re-add the
// operands before OpNo.
if (Reallocate)
for (unsigned i = 0; i != OpNo; ++i)
if (Operands[i].isReg())
Operands[i].AddRegOperandToRegInfo(RegInfo);
// When adding a register operand, tell RegInfo about it.
if (Operands[OpNo].isReg()) {
// Add the new operand to RegInfo, even when RegInfo is NULL.
// This will initialize the linked list pointers.
Operands[OpNo].AddRegOperandToRegInfo(RegInfo);
// If the register operand is flagged as early, mark the operand as such.
if (MCID->getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1)
Operands[OpNo].setIsEarlyClobber(true);
}
// Re-add all the implicit ops.
if (RegInfo) {
for (unsigned i = OpNo + 1, e = Operands.size(); i != e; ++i) {
assert(Operands[i].isReg() && "Should only be an implicit reg!");
Operands[i].AddRegOperandToRegInfo(RegInfo);
}
}
}
/// RemoveOperand - Erase an operand from an instruction, leaving it with one
/// fewer operand than it started with.
///
void MachineInstr::RemoveOperand(unsigned OpNo) {
assert(OpNo < Operands.size() && "Invalid operand number");
// Special case removing the last one.
if (OpNo == Operands.size()-1) {
// If needed, remove from the reg def/use list.
if (Operands.back().isReg() && Operands.back().isOnRegUseList())
Operands.back().RemoveRegOperandFromRegInfo();
Operands.pop_back();
return;
}
// Otherwise, we are removing an interior operand. If we have reginfo to
// update, remove all operands that will be shifted down from their reg lists,
// move everything down, then re-add them.
MachineRegisterInfo *RegInfo = getRegInfo();
if (RegInfo) {
for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
if (Operands[i].isReg())
Operands[i].RemoveRegOperandFromRegInfo();
}
}
Operands.erase(Operands.begin()+OpNo);
if (RegInfo) {
for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
if (Operands[i].isReg())
Operands[i].AddRegOperandToRegInfo(RegInfo);
}
}
}
/// addMemOperand - Add a MachineMemOperand to the machine instruction.
/// This function should be used only occasionally. The setMemRefs function
/// is the primary method for setting up a MachineInstr's MemRefs list.
void MachineInstr::addMemOperand(MachineFunction &MF,
MachineMemOperand *MO) {
mmo_iterator OldMemRefs = MemRefs;
uint16_t OldNumMemRefs = NumMemRefs;
uint16_t NewNum = NumMemRefs + 1;
mmo_iterator NewMemRefs = MF.allocateMemRefsArray(NewNum);
std::copy(OldMemRefs, OldMemRefs + OldNumMemRefs, NewMemRefs);
NewMemRefs[NewNum - 1] = MO;
MemRefs = NewMemRefs;
NumMemRefs = NewNum;
}
bool MachineInstr::hasPropertyInBundle(unsigned Mask, QueryType Type) const {
const MachineBasicBlock *MBB = getParent();
MachineBasicBlock::const_instr_iterator MII = *this; ++MII;
while (MII != MBB->end() && MII->isInsideBundle()) {
if (MII->getDesc().getFlags() & Mask) {
if (Type == AnyInBundle)
return true;
} else {
if (Type == AllInBundle)
return false;
}
++MII;
}
return Type == AllInBundle;
}
bool MachineInstr::isIdenticalTo(const MachineInstr *Other,
MICheckType Check) const {
// If opcodes or number of operands are not the same then the two
// instructions are obviously not identical.
if (Other->getOpcode() != getOpcode() ||
Other->getNumOperands() != getNumOperands())
return false;
if (isBundle()) {
// Both instructions are bundles, compare MIs inside the bundle.
MachineBasicBlock::const_instr_iterator I1 = *this;
MachineBasicBlock::const_instr_iterator E1 = getParent()->instr_end();
MachineBasicBlock::const_instr_iterator I2 = *Other;
MachineBasicBlock::const_instr_iterator E2= Other->getParent()->instr_end();
while (++I1 != E1 && I1->isInsideBundle()) {
++I2;
if (I2 == E2 || !I2->isInsideBundle() || !I1->isIdenticalTo(I2, Check))
return false;
}
}
// Check operands to make sure they match.
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
const MachineOperand &OMO = Other->getOperand(i);
if (!MO.isReg()) {
if (!MO.isIdenticalTo(OMO))
return false;
continue;
}
// Clients may or may not want to ignore defs when testing for equality.
// For example, machine CSE pass only cares about finding common
// subexpressions, so it's safe to ignore virtual register defs.
if (MO.isDef()) {
if (Check == IgnoreDefs)
continue;
else if (Check == IgnoreVRegDefs) {
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
TargetRegisterInfo::isPhysicalRegister(OMO.getReg()))
if (MO.getReg() != OMO.getReg())
return false;
} else {
if (!MO.isIdenticalTo(OMO))
return false;
if (Check == CheckKillDead && MO.isDead() != OMO.isDead())
return false;
}
} else {
if (!MO.isIdenticalTo(OMO))
return false;
if (Check == CheckKillDead && MO.isKill() != OMO.isKill())
return false;
}
}
// If DebugLoc does not match then two dbg.values are not identical.
if (isDebugValue())
if (!getDebugLoc().isUnknown() && !Other->getDebugLoc().isUnknown()
&& getDebugLoc() != Other->getDebugLoc())
return false;
return true;
}
/// removeFromParent - This method unlinks 'this' from the containing basic
/// block, and returns it, but does not delete it.
MachineInstr *MachineInstr::removeFromParent() {
assert(getParent() && "Not embedded in a basic block!");
// If it's a bundle then remove the MIs inside the bundle as well.
if (isBundle()) {
MachineBasicBlock *MBB = getParent();
MachineBasicBlock::instr_iterator MII = *this; ++MII;
MachineBasicBlock::instr_iterator E = MBB->instr_end();
while (MII != E && MII->isInsideBundle()) {
MachineInstr *MI = &*MII;
++MII;
MBB->remove(MI);
}
}
getParent()->remove(this);
return this;
}
/// eraseFromParent - This method unlinks 'this' from the containing basic
/// block, and deletes it.
void MachineInstr::eraseFromParent() {
assert(getParent() && "Not embedded in a basic block!");
// If it's a bundle then remove the MIs inside the bundle as well.
if (isBundle()) {
MachineBasicBlock *MBB = getParent();
MachineBasicBlock::instr_iterator MII = *this; ++MII;
MachineBasicBlock::instr_iterator E = MBB->instr_end();
while (MII != E && MII->isInsideBundle()) {
MachineInstr *MI = &*MII;
++MII;
MBB->erase(MI);
}
}
getParent()->erase(this);
}
/// getNumExplicitOperands - Returns the number of non-implicit operands.
///
unsigned MachineInstr::getNumExplicitOperands() const {
unsigned NumOperands = MCID->getNumOperands();
if (!MCID->isVariadic())
return NumOperands;
for (unsigned i = NumOperands, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (!MO.isReg() || !MO.isImplicit())
NumOperands++;
}
return NumOperands;
}
/// isBundled - Return true if this instruction part of a bundle. This is true
/// if either itself or its following instruction is marked "InsideBundle".
bool MachineInstr::isBundled() const {
if (isInsideBundle())
return true;
MachineBasicBlock::const_instr_iterator nextMI = this;
++nextMI;
return nextMI != Parent->instr_end() && nextMI->isInsideBundle();
}
bool MachineInstr::isStackAligningInlineAsm() const {
if (isInlineAsm()) {
unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
return true;
}
return false;
}
int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx,
unsigned *GroupNo) const {
assert(isInlineAsm() && "Expected an inline asm instruction");
assert(OpIdx < getNumOperands() && "OpIdx out of range");
// Ignore queries about the initial operands.
if (OpIdx < InlineAsm::MIOp_FirstOperand)
return -1;
unsigned Group = 0;
unsigned NumOps;
for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
i += NumOps) {
const MachineOperand &FlagMO = getOperand(i);
// If we reach the implicit register operands, stop looking.
if (!FlagMO.isImm())
return -1;
NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
if (i + NumOps > OpIdx) {
if (GroupNo)
*GroupNo = Group;
return i;
}
++Group;
}
return -1;
}
const TargetRegisterClass*
MachineInstr::getRegClassConstraint(unsigned OpIdx,
const TargetInstrInfo *TII,
const TargetRegisterInfo *TRI) const {
assert(getParent() && "Can't have an MBB reference here!");
assert(getParent()->getParent() && "Can't have an MF reference here!");
const MachineFunction &MF = *getParent()->getParent();
// Most opcodes have fixed constraints in their MCInstrDesc.
if (!isInlineAsm())
return TII->getRegClass(getDesc(), OpIdx, TRI, MF);
if (!getOperand(OpIdx).isReg())
return NULL;
// For tied uses on inline asm, get the constraint from the def.
unsigned DefIdx;
if (getOperand(OpIdx).isUse() && isRegTiedToDefOperand(OpIdx, &DefIdx))
OpIdx = DefIdx;
// Inline asm stores register class constraints in the flag word.
int FlagIdx = findInlineAsmFlagIdx(OpIdx);
if (FlagIdx < 0)
return NULL;
unsigned Flag = getOperand(FlagIdx).getImm();
unsigned RCID;
if (InlineAsm::hasRegClassConstraint(Flag, RCID))
return TRI->getRegClass(RCID);
// Assume that all registers in a memory operand are pointers.
if (InlineAsm::getKind(Flag) == InlineAsm::Kind_Mem)
return TRI->getPointerRegClass(MF);
return NULL;
}
/// getBundleSize - Return the number of instructions inside the MI bundle.
unsigned MachineInstr::getBundleSize() const {
assert(isBundle() && "Expecting a bundle");
MachineBasicBlock::const_instr_iterator I = *this;
unsigned Size = 0;
while ((++I)->isInsideBundle()) {
++Size;
}
assert(Size > 1 && "Malformed bundle");
return Size;
}
/// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
/// the specific register or -1 if it is not found. It further tightens
/// the search criteria to a use that kills the register if isKill is true.
int MachineInstr::findRegisterUseOperandIdx(unsigned Reg, bool isKill,
const TargetRegisterInfo *TRI) const {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (!MO.isReg() || !MO.isUse())
continue;
unsigned MOReg = MO.getReg();
if (!MOReg)
continue;
if (MOReg == Reg ||
(TRI &&
TargetRegisterInfo::isPhysicalRegister(MOReg) &&
TargetRegisterInfo::isPhysicalRegister(Reg) &&
TRI->isSubRegister(MOReg, Reg)))
if (!isKill || MO.isKill())
return i;
}
return -1;
}
/// readsWritesVirtualRegister - Return a pair of bools (reads, writes)
/// indicating if this instruction reads or writes Reg. This also considers
/// partial defines.
std::pair<bool,bool>
MachineInstr::readsWritesVirtualRegister(unsigned Reg,
SmallVectorImpl<unsigned> *Ops) const {
bool PartDef = false; // Partial redefine.
bool FullDef = false; // Full define.
bool Use = false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (!MO.isReg() || MO.getReg() != Reg)
continue;
if (Ops)
Ops->push_back(i);
if (MO.isUse())
Use |= !MO.isUndef();
else if (MO.getSubReg() && !MO.isUndef())
// A partial <def,undef> doesn't count as reading the register.
PartDef = true;
else
FullDef = true;
}
// A partial redefine uses Reg unless there is also a full define.
return std::make_pair(Use || (PartDef && !FullDef), PartDef || FullDef);
}
/// findRegisterDefOperandIdx() - Returns the operand index that is a def of
/// the specified register or -1 if it is not found. If isDead is true, defs
/// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
/// also checks if there is a def of a super-register.
int
MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead, bool Overlap,
const TargetRegisterInfo *TRI) const {
bool isPhys = TargetRegisterInfo::isPhysicalRegister(Reg);
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
// Accept regmask operands when Overlap is set.
// Ignore them when looking for a specific def operand (Overlap == false).
if (isPhys && Overlap && MO.isRegMask() && MO.clobbersPhysReg(Reg))
return i;
if (!MO.isReg() || !MO.isDef())
continue;
unsigned MOReg = MO.getReg();
bool Found = (MOReg == Reg);
if (!Found && TRI && isPhys &&
TargetRegisterInfo::isPhysicalRegister(MOReg)) {
if (Overlap)
Found = TRI->regsOverlap(MOReg, Reg);
else
Found = TRI->isSubRegister(MOReg, Reg);
}
if (Found && (!isDead || MO.isDead()))
return i;
}
return -1;
}
/// findFirstPredOperandIdx() - Find the index of the first operand in the
/// operand list that is used to represent the predicate. It returns -1 if
/// none is found.
int MachineInstr::findFirstPredOperandIdx() const {
// Don't call MCID.findFirstPredOperandIdx() because this variant
// is sometimes called on an instruction that's not yet complete, and
// so the number of operands is less than the MCID indicates. In
// particular, the PTX target does this.
const MCInstrDesc &MCID = getDesc();
if (MCID.isPredicable()) {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (MCID.OpInfo[i].isPredicate())
return i;
}
return -1;
}
/// isRegTiedToUseOperand - Given the index of a register def operand,
/// check if the register def is tied to a source operand, due to either
/// two-address elimination or inline assembly constraints. Returns the
/// first tied use operand index by reference is UseOpIdx is not null.
bool MachineInstr::
isRegTiedToUseOperand(unsigned DefOpIdx, unsigned *UseOpIdx) const {
if (isInlineAsm()) {
assert(DefOpIdx > InlineAsm::MIOp_FirstOperand);
const MachineOperand &MO = getOperand(DefOpIdx);
if (!MO.isReg() || !MO.isDef() || MO.getReg() == 0)
return false;
// Determine the actual operand index that corresponds to this index.
unsigned DefNo = 0;
int FlagIdx = findInlineAsmFlagIdx(DefOpIdx, &DefNo);
if (FlagIdx < 0)
return false;
// Which part of the group is DefOpIdx?
unsigned DefPart = DefOpIdx - (FlagIdx + 1);
for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands();
i != e; ++i) {
const MachineOperand &FMO = getOperand(i);
if (!FMO.isImm())
continue;
if (i+1 >= e || !getOperand(i+1).isReg() || !getOperand(i+1).isUse())
continue;
unsigned Idx;
if (InlineAsm::isUseOperandTiedToDef(FMO.getImm(), Idx) &&
Idx == DefNo) {
if (UseOpIdx)
*UseOpIdx = (unsigned)i + 1 + DefPart;
return true;
}
}
return false;
}
assert(getOperand(DefOpIdx).isDef() && "DefOpIdx is not a def!");
const MCInstrDesc &MCID = getDesc();
for (unsigned i = 0, e = MCID.getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (MO.isReg() && MO.isUse() &&
MCID.getOperandConstraint(i, MCOI::TIED_TO) == (int)DefOpIdx) {
if (UseOpIdx)
*UseOpIdx = (unsigned)i;
return true;
}
}
return false;
}
/// isRegTiedToDefOperand - Return true if the operand of the specified index
/// is a register use and it is tied to an def operand. It also returns the def
/// operand index by reference.
bool MachineInstr::
isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx) const {
if (isInlineAsm()) {
const MachineOperand &MO = getOperand(UseOpIdx);
if (!MO.isReg() || !MO.isUse() || MO.getReg() == 0)
return false;
// Find the flag operand corresponding to UseOpIdx
int FlagIdx = findInlineAsmFlagIdx(UseOpIdx);
if (FlagIdx < 0)
return false;
const MachineOperand &UFMO = getOperand(FlagIdx);
unsigned DefNo;
if (InlineAsm::isUseOperandTiedToDef(UFMO.getImm(), DefNo)) {
if (!DefOpIdx)
return true;
unsigned DefIdx = InlineAsm::MIOp_FirstOperand;
// Remember to adjust the index. First operand is asm string, second is
// the HasSideEffects and AlignStack bits, then there is a flag for each.
while (DefNo) {
const MachineOperand &FMO = getOperand(DefIdx);
assert(FMO.isImm());
// Skip over this def.
DefIdx += InlineAsm::getNumOperandRegisters(FMO.getImm()) + 1;
--DefNo;
}
*DefOpIdx = DefIdx + UseOpIdx - FlagIdx;
return true;
}
return false;
}
const MCInstrDesc &MCID = getDesc();
if (UseOpIdx >= MCID.getNumOperands())
return false;
const MachineOperand &MO = getOperand(UseOpIdx);
if (!MO.isReg() || !MO.isUse())
return false;
int DefIdx = MCID.getOperandConstraint(UseOpIdx, MCOI::TIED_TO);
if (DefIdx == -1)
return false;
if (DefOpIdx)
*DefOpIdx = (unsigned)DefIdx;
return true;
}
/// clearKillInfo - Clears kill flags on all operands.
///
void MachineInstr::clearKillInfo() {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (MO.isReg() && MO.isUse())
MO.setIsKill(false);
}
}
/// copyKillDeadInfo - Copies kill / dead operand properties from MI.
///
void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
if (!MO.isReg() || (!MO.isKill() && !MO.isDead()))
continue;
for (unsigned j = 0, ee = getNumOperands(); j != ee; ++j) {
MachineOperand &MOp = getOperand(j);
if (!MOp.isIdenticalTo(MO))
continue;
if (MO.isKill())
MOp.setIsKill();
else
MOp.setIsDead();
break;
}
}
}
/// copyPredicates - Copies predicate operand(s) from MI.
void MachineInstr::copyPredicates(const MachineInstr *MI) {
assert(!isBundle() && "MachineInstr::copyPredicates() can't handle bundles");
const MCInstrDesc &MCID = MI->getDesc();
if (!MCID.isPredicable())
return;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
if (MCID.OpInfo[i].isPredicate()) {
// Predicated operands must be last operands.
addOperand(MI->getOperand(i));
}
}
}
void MachineInstr::substituteRegister(unsigned FromReg,
unsigned ToReg,
unsigned SubIdx,
const TargetRegisterInfo &RegInfo) {
if (TargetRegisterInfo::isPhysicalRegister(ToReg)) {
if (SubIdx)
ToReg = RegInfo.getSubReg(ToReg, SubIdx);
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (!MO.isReg() || MO.getReg() != FromReg)
continue;
MO.substPhysReg(ToReg, RegInfo);
}
} else {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (!MO.isReg() || MO.getReg() != FromReg)
continue;
MO.substVirtReg(ToReg, SubIdx, RegInfo);
}
}
}
/// isSafeToMove - Return true if it is safe to move this instruction. If
/// SawStore is set to true, it means that there is a store (or call) between
/// the instruction's location and its intended destination.
bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII,
AliasAnalysis *AA,
bool &SawStore) const {
// Ignore stuff that we obviously can't move.
if (mayStore() || isCall()) {
SawStore = true;
return false;
}
if (isLabel() || isDebugValue() ||
isTerminator() || hasUnmodeledSideEffects())
return false;
// See if this instruction does a load. If so, we have to guarantee that the
// loaded value doesn't change between the load and the its intended
// destination. The check for isInvariantLoad gives the targe the chance to
// classify the load as always returning a constant, e.g. a constant pool
// load.
if (mayLoad() && !isInvariantLoad(AA))
// Otherwise, this is a real load. If there is a store between the load and
// end of block, or if the load is volatile, we can't move it.
return !SawStore && !hasVolatileMemoryRef();
return true;
}
/// isSafeToReMat - Return true if it's safe to rematerialize the specified
/// instruction which defined the specified register instead of copying it.
bool MachineInstr::isSafeToReMat(const TargetInstrInfo *TII,
AliasAnalysis *AA,
unsigned DstReg) const {
bool SawStore = false;
if (!TII->isTriviallyReMaterializable(this, AA) ||
!isSafeToMove(TII, AA, SawStore))
return false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (!MO.isReg())
continue;
// FIXME: For now, do not remat any instruction with register operands.
// Later on, we can loosen the restriction is the register operands have
// not been modified between the def and use. Note, this is different from
// MachineSink because the code is no longer in two-address form (at least
// partially).
if (MO.isUse())
return false;
else if (!MO.isDead() && MO.getReg() != DstReg)
return false;
}
return true;
}
/// hasVolatileMemoryRef - Return true if this instruction may have a
/// volatile memory reference, or if the information describing the
/// memory reference is not available. Return false if it is known to
/// have no volatile memory references.
bool MachineInstr::hasVolatileMemoryRef() const {
// An instruction known never to access memory won't have a volatile access.
if (!mayStore() &&
!mayLoad() &&
!isCall() &&
!hasUnmodeledSideEffects())
return false;
// Otherwise, if the instruction has no memory reference information,
// conservatively assume it wasn't preserved.
if (memoperands_empty())
return true;
// Check the memory reference information for volatile references.
for (mmo_iterator I = memoperands_begin(), E = memoperands_end(); I != E; ++I)
if ((*I)->isVolatile())
return true;
return false;
}
/// isInvariantLoad - Return true if this instruction is loading from a
/// location whose value is invariant across the function. For example,
/// loading a value from the constant pool or from the argument area
/// of a function if it does not change. This should only return true of
/// *all* loads the instruction does are invariant (if it does multiple loads).
bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
// If the instruction doesn't load at all, it isn't an invariant load.
if (!mayLoad())
return false;
// If the instruction has lost its memoperands, conservatively assume that
// it may not be an invariant load.
if (memoperands_empty())
return false;
const MachineFrameInfo *MFI = getParent()->getParent()->getFrameInfo();
for (mmo_iterator I = memoperands_begin(),
E = memoperands_end(); I != E; ++I) {
if ((*I)->isVolatile()) return false;
if ((*I)->isStore()) return false;
if ((*I)->isInvariant()) return true;
if (const Value *V = (*I)->getValue()) {
// A load from a constant PseudoSourceValue is invariant.
if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V))
if (PSV->isConstant(MFI))
continue;
// If we have an AliasAnalysis, ask it whether the memory is constant.
if (AA && AA->pointsToConstantMemory(
AliasAnalysis::Location(V, (*I)->getSize(),
(*I)->getTBAAInfo())))
continue;
}
// Otherwise assume conservatively.
return false;
}
// Everything checks out.
return true;
}
/// isConstantValuePHI - If the specified instruction is a PHI that always
/// merges together the same virtual register, return the register, otherwise
/// return 0.
unsigned MachineInstr::isConstantValuePHI() const {
if (!isPHI())
return 0;
assert(getNumOperands() >= 3 &&
"It's illegal to have a PHI without source operands");
unsigned Reg = getOperand(1).getReg();
for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)
if (getOperand(i).getReg() != Reg)
return 0;
return Reg;
}
bool MachineInstr::hasUnmodeledSideEffects() const {
if (hasProperty(MCID::UnmodeledSideEffects))
return true;
if (isInlineAsm()) {
unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
return true;
}
return false;
}
/// allDefsAreDead - Return true if all the defs of this instruction are dead.
///
bool MachineInstr::allDefsAreDead() const {
for (unsigned i = 0, e = getNumOperands(); i < e; ++i) {
const MachineOperand &MO = getOperand(i);
if (!MO.isReg() || MO.isUse())
continue;
if (!MO.isDead())
return false;
}
return true;
}
/// copyImplicitOps - Copy implicit register operands from specified
/// instruction to this instruction.
void MachineInstr::copyImplicitOps(const MachineInstr *MI) {
for (unsigned i = MI->getDesc().getNumOperands(), e = MI->getNumOperands();
i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
if (MO.isReg() && MO.isImplicit())
addOperand(MO);
}
}
void MachineInstr::dump() const {
dbgs() << " " << *this;
}
static void printDebugLoc(DebugLoc DL, const MachineFunction *MF,
raw_ostream &CommentOS) {
const LLVMContext &Ctx = MF->getFunction()->getContext();
if (!DL.isUnknown()) { // Print source line info.
DIScope Scope(DL.getScope(Ctx));
// Omit the directory, because it's likely to be long and uninteresting.
if (Scope.Verify())
CommentOS << Scope.getFilename();
else
CommentOS << "<unknown>";
CommentOS << ':' << DL.getLine();
if (DL.getCol() != 0)
CommentOS << ':' << DL.getCol();
DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx));
if (!InlinedAtDL.isUnknown()) {
CommentOS << " @[ ";
printDebugLoc(InlinedAtDL, MF, CommentOS);
CommentOS << " ]";
}
}
}
void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
// We can be a bit tidier if we know the TargetMachine and/or MachineFunction.
const MachineFunction *MF = 0;
const MachineRegisterInfo *MRI = 0;
if (const MachineBasicBlock *MBB = getParent()) {
MF = MBB->getParent();
if (!TM && MF)
TM = &MF->getTarget();
if (MF)
MRI = &MF->getRegInfo();
}
// Save a list of virtual registers.
SmallVector<unsigned, 8> VirtRegs;
// Print explicitly defined operands on the left of an assignment syntax.
unsigned StartOp = 0, e = getNumOperands();
for (; StartOp < e && getOperand(StartOp).isReg() &&
getOperand(StartOp).isDef() &&
!getOperand(StartOp).isImplicit();
++StartOp) {
if (StartOp != 0) OS << ", ";
getOperand(StartOp).print(OS, TM);
unsigned Reg = getOperand(StartOp).getReg();
if (TargetRegisterInfo::isVirtualRegister(Reg))
VirtRegs.push_back(Reg);
}
if (StartOp != 0)
OS << " = ";
// Print the opcode name.
if (TM && TM->getInstrInfo())
OS << TM->getInstrInfo()->getName(getOpcode());
else
OS << "UNKNOWN";
// Print the rest of the operands.
bool OmittedAnyCallClobbers = false;
bool FirstOp = true;
unsigned AsmDescOp = ~0u;
unsigned AsmOpCount = 0;
if (isInlineAsm() && e >= InlineAsm::MIOp_FirstOperand) {
// Print asm string.
OS << " ";
getOperand(InlineAsm::MIOp_AsmString).print(OS, TM);
// Print HasSideEffects, IsAlignStack
unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
OS << " [sideeffect]";
if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
OS << " [alignstack]";
StartOp = AsmDescOp = InlineAsm::MIOp_FirstOperand;
FirstOp = false;
}
for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (MO.isReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg()))
VirtRegs.push_back(MO.getReg());
// Omit call-clobbered registers which aren't used anywhere. This makes
// call instructions much less noisy on targets where calls clobber lots
// of registers. Don't rely on MO.isDead() because we may be called before
// LiveVariables is run, or we may be looking at a non-allocatable reg.
if (MF && isCall() &&
MO.isReg() && MO.isImplicit() && MO.isDef()) {
unsigned Reg = MO.getReg();
if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
const MachineRegisterInfo &MRI = MF->getRegInfo();
if (MRI.use_empty(Reg) && !MRI.isLiveOut(Reg)) {
bool HasAliasLive = false;
for (const uint16_t *Alias = TM->getRegisterInfo()->getAliasSet(Reg);
unsigned AliasReg = *Alias; ++Alias)
if (!MRI.use_empty(AliasReg) || MRI.isLiveOut(AliasReg)) {
HasAliasLive = true;
break;
}
if (!HasAliasLive) {
OmittedAnyCallClobbers = true;
continue;
}
}
}
}
if (FirstOp) FirstOp = false; else OS << ",";
OS << " ";
if (i < getDesc().NumOperands) {
const MCOperandInfo &MCOI = getDesc().OpInfo[i];
if (MCOI.isPredicate())
OS << "pred:";
if (MCOI.isOptionalDef())
OS << "opt:";
}
if (isDebugValue() && MO.isMetadata()) {
// Pretty print DBG_VALUE instructions.
const MDNode *MD = MO.getMetadata();
if (const MDString *MDS = dyn_cast<MDString>(MD->getOperand(2)))
OS << "!\"" << MDS->getString() << '\"';
else
MO.print(OS, TM);
} else if (TM && (isInsertSubreg() || isRegSequence()) && MO.isImm()) {
OS << TM->getRegisterInfo()->getSubRegIndexName(MO.getImm());
} else if (i == AsmDescOp && MO.isImm()) {
// Pretty print the inline asm operand descriptor.
OS << '$' << AsmOpCount++;
unsigned Flag = MO.getImm();
switch (InlineAsm::getKind(Flag)) {
case InlineAsm::Kind_RegUse: OS << ":[reguse"; break;
case InlineAsm::Kind_RegDef: OS << ":[regdef"; break;
case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec"; break;
case InlineAsm::Kind_Clobber: OS << ":[clobber"; break;
case InlineAsm::Kind_Imm: OS << ":[imm"; break;
case InlineAsm::Kind_Mem: OS << ":[mem"; break;
default: OS << ":[??" << InlineAsm::getKind(Flag); break;
}
unsigned RCID = 0;
if (InlineAsm::hasRegClassConstraint(Flag, RCID)) {
if (TM)
OS << ':' << TM->getRegisterInfo()->getRegClass(RCID)->getName();
else
OS << ":RC" << RCID;
}
unsigned TiedTo = 0;
if (InlineAsm::isUseOperandTiedToDef(Flag, TiedTo))
OS << " tiedto:$" << TiedTo;
OS << ']';
// Compute the index of the next operand descriptor.
AsmDescOp += 1 + InlineAsm::getNumOperandRegisters(Flag);
} else
MO.print(OS, TM);
}
// Briefly indicate whether any call clobbers were omitted.
if (OmittedAnyCallClobbers) {
if (!FirstOp) OS << ",";
OS << " ...";
}
bool HaveSemi = false;
if (Flags) {
if (!HaveSemi) OS << ";"; HaveSemi = true;
OS << " flags: ";
if (Flags & FrameSetup)
OS << "FrameSetup";
}
if (!memoperands_empty()) {
if (!HaveSemi) OS << ";"; HaveSemi = true;
OS << " mem:";
for (mmo_iterator i = memoperands_begin(), e = memoperands_end();
i != e; ++i) {
OS << **i;
if (llvm::next(i) != e)
OS << " ";
}
}
// Print the regclass of any virtual registers encountered.
if (MRI && !VirtRegs.empty()) {
if (!HaveSemi) OS << ";"; HaveSemi = true;
for (unsigned i = 0; i != VirtRegs.size(); ++i) {
const TargetRegisterClass *RC = MRI->getRegClass(VirtRegs[i]);
OS << " " << RC->getName() << ':' << PrintReg(VirtRegs[i]);
for (unsigned j = i+1; j != VirtRegs.size();) {
if (MRI->getRegClass(VirtRegs[j]) != RC) {
++j;
continue;
}
if (VirtRegs[i] != VirtRegs[j])
OS << "," << PrintReg(VirtRegs[j]);
VirtRegs.erase(VirtRegs.begin()+j);
}
}
}
// Print debug location information.
if (isDebugValue() && getOperand(e - 1).isMetadata()) {
if (!HaveSemi) OS << ";"; HaveSemi = true;
DIVariable DV(getOperand(e - 1).getMetadata());
OS << " line no:" << DV.getLineNumber();
if (MDNode *InlinedAt = DV.getInlinedAt()) {
DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt);
if (!InlinedAtDL.isUnknown()) {
OS << " inlined @[ ";
printDebugLoc(InlinedAtDL, MF, OS);
OS << " ]";
}
}
} else if (!debugLoc.isUnknown() && MF) {
if (!HaveSemi) OS << ";"; HaveSemi = true;
OS << " dbg:";
printDebugLoc(debugLoc, MF, OS);
}
OS << '\n';
}
bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
bool hasAliases = isPhysReg && RegInfo->getAliasSet(IncomingReg);
bool Found = false;
SmallVector<unsigned,4> DeadOps;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (!MO.isReg() || !MO.isUse() || MO.isUndef())
continue;
unsigned Reg = MO.getReg();
if (!Reg)
continue;
if (Reg == IncomingReg) {
if (!Found) {
if (MO.isKill())
// The register is already marked kill.
return true;
if (isPhysReg && isRegTiedToDefOperand(i))
// Two-address uses of physregs must not be marked kill.
return true;
MO.setIsKill();
Found = true;
}
} else if (hasAliases && MO.isKill() &&
TargetRegisterInfo::isPhysicalRegister(Reg)) {
// A super-register kill already exists.
if (RegInfo->isSuperRegister(IncomingReg, Reg))
return true;
if (RegInfo->isSubRegister(IncomingReg, Reg))
DeadOps.push_back(i);
}
}
// Trim unneeded kill operands.
while (!DeadOps.empty()) {
unsigned OpIdx = DeadOps.back();
if (getOperand(OpIdx).isImplicit())
RemoveOperand(OpIdx);
else
getOperand(OpIdx).setIsKill(false);
DeadOps.pop_back();
}
// If not found, this means an alias of one of the operands is killed. Add a
// new implicit operand if required.
if (!Found && AddIfNotFound) {
addOperand(MachineOperand::CreateReg(IncomingReg,
false /*IsDef*/,
true /*IsImp*/,
true /*IsKill*/));
return true;
}
return Found;
}
void MachineInstr::clearRegisterKills(unsigned Reg,
const TargetRegisterInfo *RegInfo) {
if (!TargetRegisterInfo::isPhysicalRegister(Reg))
RegInfo = 0;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (!MO.isReg() || !MO.isUse() || !MO.isKill())
continue;
unsigned OpReg = MO.getReg();
if (OpReg == Reg || (RegInfo && RegInfo->isSuperRegister(Reg, OpReg)))
MO.setIsKill(false);
}
}
bool MachineInstr::addRegisterDead(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
bool hasAliases = isPhysReg && RegInfo->getAliasSet(IncomingReg);
bool Found = false;
SmallVector<unsigned,4> DeadOps;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (!MO.isReg() || !MO.isDef())
continue;
unsigned Reg = MO.getReg();
if (!Reg)
continue;
if (Reg == IncomingReg) {
MO.setIsDead();
Found = true;
} else if (hasAliases && MO.isDead() &&
TargetRegisterInfo::isPhysicalRegister(Reg)) {
// There exists a super-register that's marked dead.
if (RegInfo->isSuperRegister(IncomingReg, Reg))
return true;
if (RegInfo->getSubRegisters(IncomingReg) &&
RegInfo->getSuperRegisters(Reg) &&
RegInfo->isSubRegister(IncomingReg, Reg))
DeadOps.push_back(i);
}
}
// Trim unneeded dead operands.
while (!DeadOps.empty()) {
unsigned OpIdx = DeadOps.back();
if (getOperand(OpIdx).isImplicit())
RemoveOperand(OpIdx);
else
getOperand(OpIdx).setIsDead(false);
DeadOps.pop_back();
}
// If not found, this means an alias of one of the operands is dead. Add a
// new implicit operand if required.
if (Found || !AddIfNotFound)
return Found;
addOperand(MachineOperand::CreateReg(IncomingReg,
true /*IsDef*/,
true /*IsImp*/,
false /*IsKill*/,
true /*IsDead*/));
return true;
}
void MachineInstr::addRegisterDefined(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo) {
if (TargetRegisterInfo::isPhysicalRegister(IncomingReg)) {
MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo);
if (MO)
return;
} else {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (MO.isReg() && MO.getReg() == IncomingReg && MO.isDef() &&
MO.getSubReg() == 0)
return;
}
}
addOperand(MachineOperand::CreateReg(IncomingReg,
true /*IsDef*/,
true /*IsImp*/));
}
void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
const TargetRegisterInfo &TRI) {
bool HasRegMask = false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (MO.isRegMask()) {
HasRegMask = true;
continue;
}
if (!MO.isReg() || !MO.isDef()) continue;
unsigned Reg = MO.getReg();
if (!TargetRegisterInfo::isPhysicalRegister(Reg)) continue;
bool Dead = true;
for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
I != E; ++I)
if (TRI.regsOverlap(*I, Reg)) {
Dead = false;
break;
}
// If there are no uses, including partial uses, the def is dead.
if (Dead) MO.setIsDead();
}
// This is a call with a register mask operand.
// Mask clobbers are always dead, so add defs for the non-dead defines.
if (HasRegMask)
for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
I != E; ++I)
addRegisterDefined(*I, &TRI);
}
unsigned
MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) {
// Build up a buffer of hash code components.
//
// FIXME: This is a total hack. We should have a hash_value overload for
// MachineOperand, but currently that doesn't work because there are many
// different ideas of "equality" and thus different sets of information that
// contribute to the hash code. This one happens to want to take a specific
// subset. And it's still not clear that this routine uses the *correct*
// subset of information when computing the hash code. The goal is to use the
// same inputs for the hash code here that MachineInstr::isIdenticalTo uses to
// test for equality when passed the 'IgnoreVRegDefs' filter flag. It would
// be very useful to factor the selection of relevant inputs out of the two
// functions and into a common routine, but it's not clear how that can be
// done.
SmallVector<size_t, 8> HashComponents;
HashComponents.reserve(MI->getNumOperands() + 1);
HashComponents.push_back(MI->getOpcode());
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
switch (MO.getType()) {
default: break;
case MachineOperand::MO_Register:
if (MO.isDef() && TargetRegisterInfo::isVirtualRegister(MO.getReg()))
continue; // Skip virtual register defs.
HashComponents.push_back(hash_combine(MO.getType(), MO.getReg()));
break;
case MachineOperand::MO_Immediate:
HashComponents.push_back(hash_combine(MO.getType(), MO.getImm()));
break;
case MachineOperand::MO_FrameIndex:
case MachineOperand::MO_ConstantPoolIndex:
case MachineOperand::MO_JumpTableIndex:
HashComponents.push_back(hash_combine(MO.getType(), MO.getIndex()));
break;
case MachineOperand::MO_MachineBasicBlock:
HashComponents.push_back(hash_combine(MO.getType(), MO.getMBB()));
break;
case MachineOperand::MO_GlobalAddress:
HashComponents.push_back(hash_combine(MO.getType(), MO.getGlobal()));
break;
case MachineOperand::MO_BlockAddress:
HashComponents.push_back(hash_combine(MO.getType(),
MO.getBlockAddress()));
break;
case MachineOperand::MO_MCSymbol:
HashComponents.push_back(hash_combine(MO.getType(), MO.getMCSymbol()));
break;
}
}
return hash_combine_range(HashComponents.begin(), HashComponents.end());
}
void MachineInstr::emitError(StringRef Msg) const {
// Find the source location cookie.
unsigned LocCookie = 0;
const MDNode *LocMD = 0;
for (unsigned i = getNumOperands(); i != 0; --i) {
if (getOperand(i-1).isMetadata() &&
(LocMD = getOperand(i-1).getMetadata()) &&
LocMD->getNumOperands() != 0) {
if (const ConstantInt *CI = dyn_cast<ConstantInt>(LocMD->getOperand(0))) {
LocCookie = CI->getZExtValue();
break;
}
}
}
if (const MachineBasicBlock *MBB = getParent())
if (const MachineFunction *MF = MBB->getParent())
return MF->getMMI().getModule()->getContext().emitError(LocCookie, Msg);
report_fatal_error(Msg);
}
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