Check in LLVM r95781.
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
new file mode 100644
index 0000000..df61c74
--- /dev/null
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -0,0 +1,1326 @@
+//===-- 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/Type.h"
+#include "llvm/Value.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineMemOperand.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/PseudoSourceValue.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetInstrDesc.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/Metadata.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();
+ Contents.Reg.RegNo = Reg;
+ AddRegOperandToRegInfo(&MF->getRegInfo());
+ return;
+ }
+
+ // Otherwise, just change the register, no problem. :)
+ Contents.Reg.RegNo = 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;
+ Contents.Reg.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;
+ 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()) {
+ default: llvm_unreachable("Unrecognized operand type");
+ 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_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();
+ }
+}
+
+/// 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();
+
+ switch (getType()) {
+ case MachineOperand::MO_Register:
+ if (getReg() == 0 || TargetRegisterInfo::isVirtualRegister(getReg())) {
+ OS << "%reg" << getReg();
+ } else {
+ if (TM)
+ OS << "%" << TM->getRegisterInfo()->get(getReg()).Name;
+ else
+ OS << "%physreg" << getReg();
+ }
+
+ if (getSubReg() != 0)
+ OS << ':' << getSubReg();
+
+ if (isDef() || isKill() || isDead() || isImplicit() || isUndef() ||
+ isEarlyClobber()) {
+ OS << '<';
+ bool NeedComma = false;
+ if (isDef()) {
+ if (NeedComma) OS << ',';
+ if (isEarlyClobber())
+ OS << "earlyclobber,";
+ if (isImplicit())
+ OS << "imp-";
+ OS << "def";
+ NeedComma = true;
+ } else if (isImplicit()) {
+ OS << "imp-use";
+ NeedComma = true;
+ }
+
+ if (isKill() || isDead() || isUndef()) {
+ if (NeedComma) OS << ',';
+ if (isKill()) OS << "kill";
+ if (isDead()) OS << "dead";
+ if (isUndef()) {
+ if (isKill() || isDead())
+ OS << ',';
+ OS << "undef";
+ }
+ }
+ OS << '>';
+ }
+ break;
+ case MachineOperand::MO_Immediate:
+ OS << getImm();
+ 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_Metadata:
+ OS << '<';
+ WriteAsOperand(OS, getMetadata(), /*PrintType=*/false);
+ OS << '>';
+ break;
+ default:
+ llvm_unreachable("Unrecognized operand type");
+ }
+
+ if (unsigned TF = getTargetFlags())
+ OS << "[TF=" << TF << ']';
+}
+
+//===----------------------------------------------------------------------===//
+// MachineMemOperand Implementation
+//===----------------------------------------------------------------------===//
+
+MachineMemOperand::MachineMemOperand(const Value *v, unsigned int f,
+ int64_t o, uint64_t s, unsigned int a)
+ : Offset(o), Size(s), V(v),
+ Flags((f & 7) | ((Log2_32(a) + 1) << 3)) {
+ 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(Offset);
+ ID.AddInteger(Size);
+ ID.AddPointer(V);
+ 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 & 7) | ((Log2_32(MMO->getBaseAlignment()) + 1) << 3);
+ // Also update the base and offset, because the new alignment may
+ // not be applicable with the old ones.
+ V = MMO->getValue();
+ Offset = MMO->getOffset();
+ }
+}
+
+/// 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() << ")";
+
+ return OS;
+}
+
+//===----------------------------------------------------------------------===//
+// MachineInstr Implementation
+//===----------------------------------------------------------------------===//
+
+/// MachineInstr ctor - This constructor creates a dummy MachineInstr with
+/// TID NULL and no operands.
+MachineInstr::MachineInstr()
+ : TID(0), NumImplicitOps(0), AsmPrinterFlags(0), MemRefs(0), MemRefsEnd(0),
+ Parent(0), debugLoc(DebugLoc::getUnknownLoc()) {
+ // Make sure that we get added to a machine basicblock
+ LeakDetector::addGarbageObject(this);
+}
+
+void MachineInstr::addImplicitDefUseOperands() {
+ if (TID->ImplicitDefs)
+ for (const unsigned *ImpDefs = TID->ImplicitDefs; *ImpDefs; ++ImpDefs)
+ addOperand(MachineOperand::CreateReg(*ImpDefs, true, true));
+ if (TID->ImplicitUses)
+ for (const unsigned *ImpUses = TID->ImplicitUses; *ImpUses; ++ImpUses)
+ addOperand(MachineOperand::CreateReg(*ImpUses, false, true));
+}
+
+/// MachineInstr ctor - This constructor create a MachineInstr and add the
+/// implicit operands. It reserves space for number of operands specified by
+/// TargetInstrDesc or the numOperands if it is not zero. (for
+/// instructions with variable number of operands).
+MachineInstr::MachineInstr(const TargetInstrDesc &tid, bool NoImp)
+ : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0),
+ MemRefs(0), MemRefsEnd(0), Parent(0),
+ debugLoc(DebugLoc::getUnknownLoc()) {
+ if (!NoImp && TID->getImplicitDefs())
+ for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
+ NumImplicitOps++;
+ if (!NoImp && TID->getImplicitUses())
+ for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
+ NumImplicitOps++;
+ Operands.reserve(NumImplicitOps + TID->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 TargetInstrDesc &tid, const DebugLoc dl,
+ bool NoImp)
+ : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0), MemRefs(0), MemRefsEnd(0),
+ Parent(0), debugLoc(dl) {
+ if (!NoImp && TID->getImplicitDefs())
+ for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
+ NumImplicitOps++;
+ if (!NoImp && TID->getImplicitUses())
+ for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
+ NumImplicitOps++;
+ Operands.reserve(NumImplicitOps + TID->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 TargetInstrDesc &tid)
+ : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0),
+ MemRefs(0), MemRefsEnd(0), Parent(0),
+ debugLoc(DebugLoc::getUnknownLoc()) {
+ assert(MBB && "Cannot use inserting ctor with null basic block!");
+ if (TID->ImplicitDefs)
+ for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
+ NumImplicitOps++;
+ if (TID->ImplicitUses)
+ for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
+ NumImplicitOps++;
+ Operands.reserve(NumImplicitOps + TID->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 TargetInstrDesc &tid)
+ : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0), MemRefs(0), MemRefsEnd(0),
+ Parent(0), debugLoc(dl) {
+ assert(MBB && "Cannot use inserting ctor with null basic block!");
+ if (TID->ImplicitDefs)
+ for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
+ NumImplicitOps++;
+ if (TID->ImplicitUses)
+ for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
+ NumImplicitOps++;
+ Operands.reserve(NumImplicitOps + TID->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)
+ : TID(&MI.getDesc()), NumImplicitOps(0), AsmPrinterFlags(0),
+ MemRefs(MI.MemRefs), MemRefsEnd(MI.MemRefsEnd),
+ Parent(0), debugLoc(MI.getDebugLoc()) {
+ Operands.reserve(MI.getNumOperands());
+
+ // Add operands
+ for (unsigned i = 0; i != MI.getNumOperands(); ++i)
+ addOperand(MI.getOperand(i));
+ NumImplicitOps = MI.NumImplicitOps;
+
+ // 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) {
+ bool isImpReg = Op.isReg() && Op.isImplicit();
+ assert((isImpReg || !OperandsComplete()) &&
+ "Trying to add an operand to a machine instr that is already done!");
+
+ MachineRegisterInfo *RegInfo = getRegInfo();
+
+ // If we are adding the operand to the end of the list, our job is simpler.
+ // This is true most of the time, so this is a reasonable optimization.
+ if (isImpReg || NumImplicitOps == 0) {
+ // We can only do this optimization if we know that the operand list won't
+ // reallocate.
+ if (Operands.empty() || Operands.size()+1 <= Operands.capacity()) {
+ Operands.push_back(Op);
+
+ // Set the parent of the operand.
+ Operands.back().ParentMI = this;
+
+ // If the operand is a register, update the operand's use list.
+ if (Op.isReg()) {
+ Operands.back().AddRegOperandToRegInfo(RegInfo);
+ // If the register operand is flagged as early, mark the operand as such
+ unsigned OpNo = Operands.size() - 1;
+ if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
+ Operands[OpNo].setIsEarlyClobber(true);
+ }
+ return;
+ }
+ }
+
+ // Otherwise, we have to insert a real operand before any implicit ones.
+ unsigned OpNo = Operands.size()-NumImplicitOps;
+
+ // If this instruction isn't embedded into a function, then we don't need to
+ // update any operand lists.
+ if (RegInfo == 0) {
+ // Simple insertion, no reginfo update needed for other register operands.
+ Operands.insert(Operands.begin()+OpNo, Op);
+ Operands[OpNo].ParentMI = this;
+
+ // Do explicitly set the reginfo for this operand though, to ensure the
+ // next/prev fields are properly nulled out.
+ if (Operands[OpNo].isReg()) {
+ Operands[OpNo].AddRegOperandToRegInfo(0);
+ // If the register operand is flagged as early, mark the operand as such
+ if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
+ Operands[OpNo].setIsEarlyClobber(true);
+ }
+
+ } else if (Operands.size()+1 <= Operands.capacity()) {
+ // Otherwise, we have to remove register operands from their register use
+ // list, add the operand, then add the register operands back to their use
+ // list. This also must handle the case when the operand list reallocates
+ // to somewhere else.
+
+ // If insertion of this operand won't cause reallocation of the operand
+ // list, just remove the implicit operands, add the operand, then re-add all
+ // the rest of the operands.
+ for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
+ assert(Operands[i].isReg() && "Should only be an implicit reg!");
+ Operands[i].RemoveRegOperandFromRegInfo();
+ }
+
+ // Add the operand. If it is a register, add it to the reg list.
+ Operands.insert(Operands.begin()+OpNo, Op);
+ Operands[OpNo].ParentMI = this;
+
+ if (Operands[OpNo].isReg()) {
+ Operands[OpNo].AddRegOperandToRegInfo(RegInfo);
+ // If the register operand is flagged as early, mark the operand as such
+ if (TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
+ Operands[OpNo].setIsEarlyClobber(true);
+ }
+
+ // Re-add all the implicit ops.
+ 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);
+ }
+ } else {
+ // Otherwise, we will be reallocating the operand list. Remove all reg
+ // operands from their list, then readd them after the operand list is
+ // reallocated.
+ RemoveRegOperandsFromUseLists();
+
+ Operands.insert(Operands.begin()+OpNo, Op);
+ Operands[OpNo].ParentMI = this;
+
+ // Re-add all the operands.
+ AddRegOperandsToUseLists(*RegInfo);
+
+ // If the register operand is flagged as early, mark the operand as such
+ if (Operands[OpNo].isReg()
+ && TID->getOperandConstraint(OpNo, TOI::EARLY_CLOBBER) != -1)
+ Operands[OpNo].setIsEarlyClobber(true);
+ }
+}
+
+/// 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;
+ mmo_iterator OldMemRefsEnd = MemRefsEnd;
+
+ size_t NewNum = (MemRefsEnd - MemRefs) + 1;
+ mmo_iterator NewMemRefs = MF.allocateMemRefsArray(NewNum);
+ mmo_iterator NewMemRefsEnd = NewMemRefs + NewNum;
+
+ std::copy(OldMemRefs, OldMemRefsEnd, NewMemRefs);
+ NewMemRefs[NewNum - 1] = MO;
+
+ MemRefs = NewMemRefs;
+ MemRefsEnd = NewMemRefsEnd;
+}
+
+/// 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!");
+ 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!");
+ getParent()->erase(this);
+}
+
+
+/// OperandComplete - Return true if it's illegal to add a new operand
+///
+bool MachineInstr::OperandsComplete() const {
+ unsigned short NumOperands = TID->getNumOperands();
+ if (!TID->isVariadic() && getNumOperands()-NumImplicitOps >= NumOperands)
+ return true; // Broken: we have all the operands of this instruction!
+ return false;
+}
+
+/// getNumExplicitOperands - Returns the number of non-implicit operands.
+///
+unsigned MachineInstr::getNumExplicitOperands() const {
+ unsigned NumOperands = TID->getNumOperands();
+ if (!TID->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;
+}
+
+
+/// 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;
+}
+
+/// 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,
+ const TargetRegisterInfo *TRI) const {
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = getOperand(i);
+ if (!MO.isReg() || !MO.isDef())
+ continue;
+ unsigned MOReg = MO.getReg();
+ if (MOReg == Reg ||
+ (TRI &&
+ TargetRegisterInfo::isPhysicalRegister(MOReg) &&
+ TargetRegisterInfo::isPhysicalRegister(Reg) &&
+ TRI->isSubRegister(MOReg, Reg)))
+ if (!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 {
+ const TargetInstrDesc &TID = getDesc();
+ if (TID.isPredicable()) {
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ if (TID.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 >= 2);
+ 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;
+ unsigned DefPart = 0;
+ for (unsigned i = 1, e = getNumOperands(); i < e; ) {
+ const MachineOperand &FMO = getOperand(i);
+ // After the normal asm operands there may be additional imp-def regs.
+ if (!FMO.isImm())
+ return false;
+ // Skip over this def.
+ unsigned NumOps = InlineAsm::getNumOperandRegisters(FMO.getImm());
+ unsigned PrevDef = i + 1;
+ i = PrevDef + NumOps;
+ if (i > DefOpIdx) {
+ DefPart = DefOpIdx - PrevDef;
+ break;
+ }
+ ++DefNo;
+ }
+ for (unsigned i = 1, 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 TargetInstrDesc &TID = getDesc();
+ for (unsigned i = 0, e = TID.getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = getOperand(i);
+ if (MO.isReg() && MO.isUse() &&
+ TID.getOperandConstraint(i, TOI::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
+ unsigned FlagIdx, NumOps=0;
+ for (FlagIdx = 1; FlagIdx < UseOpIdx; FlagIdx += NumOps+1) {
+ const MachineOperand &UFMO = getOperand(FlagIdx);
+ // After the normal asm operands there may be additional imp-def regs.
+ if (!UFMO.isImm())
+ return false;
+ NumOps = InlineAsm::getNumOperandRegisters(UFMO.getImm());
+ assert(NumOps < getNumOperands() && "Invalid inline asm flag");
+ if (UseOpIdx < FlagIdx+NumOps+1)
+ break;
+ }
+ if (FlagIdx >= UseOpIdx)
+ return false;
+ const MachineOperand &UFMO = getOperand(FlagIdx);
+ unsigned DefNo;
+ if (InlineAsm::isUseOperandTiedToDef(UFMO.getImm(), DefNo)) {
+ if (!DefOpIdx)
+ return true;
+
+ unsigned DefIdx = 1;
+ // Remember to adjust the index. First operand is asm string, 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 TargetInstrDesc &TID = getDesc();
+ if (UseOpIdx >= TID.getNumOperands())
+ return false;
+ const MachineOperand &MO = getOperand(UseOpIdx);
+ if (!MO.isReg() || !MO.isUse())
+ return false;
+ int DefIdx = TID.getOperandConstraint(UseOpIdx, TOI::TIED_TO);
+ if (DefIdx == -1)
+ return false;
+ if (DefOpIdx)
+ *DefOpIdx = (unsigned)DefIdx;
+ return true;
+}
+
+/// 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) {
+ const TargetInstrDesc &TID = MI->getDesc();
+ if (!TID.isPredicable())
+ return;
+ for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+ if (TID.OpInfo[i].isPredicate()) {
+ // Predicated operands must be last operands.
+ addOperand(MI->getOperand(i));
+ }
+ }
+}
+
+/// 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,
+ bool &SawStore,
+ AliasAnalysis *AA) const {
+ // Ignore stuff that we obviously can't move.
+ if (TID->mayStore() || TID->isCall()) {
+ SawStore = true;
+ return false;
+ }
+ if (TID->isTerminator() || TID->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 (TID->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,
+ unsigned DstReg,
+ AliasAnalysis *AA) const {
+ bool SawStore = false;
+ if (!TII->isTriviallyReMaterializable(this, AA) ||
+ !isSafeToMove(TII, SawStore, AA))
+ 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 (!TID->mayStore() &&
+ !TID->mayLoad() &&
+ !TID->isCall() &&
+ !TID->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 (!TID->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 (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(V))
+ 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;
+}
+
+void MachineInstr::dump() const {
+ dbgs() << " " << *this;
+}
+
+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;
+ if (const MachineBasicBlock *MBB = getParent()) {
+ MF = MBB->getParent();
+ if (!TM && MF)
+ TM = &MF->getTarget();
+ }
+
+ // 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);
+ }
+
+ if (StartOp != 0)
+ OS << " = ";
+
+ // Print the opcode name.
+ OS << getDesc().getName();
+
+ // Print the rest of the operands.
+ bool OmittedAnyCallClobbers = false;
+ bool FirstOp = true;
+ for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = getOperand(i);
+
+ // 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 && getDesc().isCall() &&
+ MO.isReg() && MO.isImplicit() && MO.isDef()) {
+ unsigned Reg = MO.getReg();
+ if (Reg != 0 && TargetRegisterInfo::isPhysicalRegister(Reg)) {
+ const MachineRegisterInfo &MRI = MF->getRegInfo();
+ if (MRI.use_empty(Reg) && !MRI.isLiveOut(Reg)) {
+ bool HasAliasLive = false;
+ for (const unsigned *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 TargetOperandInfo &TOI = getDesc().OpInfo[i];
+ if (TOI.isPredicate())
+ OS << "pred:";
+ if (TOI.isOptionalDef())
+ OS << "opt:";
+ }
+ MO.print(OS, TM);
+ }
+
+ // Briefly indicate whether any call clobbers were omitted.
+ if (OmittedAnyCallClobbers) {
+ if (!FirstOp) OS << ",";
+ OS << " ...";
+ }
+
+ bool HaveSemi = false;
+ 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 (next(i) != e)
+ OS << " ";
+ }
+ }
+
+ if (!debugLoc.isUnknown() && MF) {
+ if (!HaveSemi) OS << ";";
+
+ // TODO: print InlinedAtLoc information
+
+ DILocation DLT = MF->getDILocation(debugLoc);
+ DIScope Scope = DLT.getScope();
+ OS << " dbg:";
+ // Omit the directory, since it's usually long and uninteresting.
+ if (!Scope.isNull())
+ OS << Scope.getFilename();
+ else
+ OS << "<unknown>";
+ OS << ':' << DLT.getLineNumber();
+ if (DLT.getColumnNumber() != 0)
+ OS << ':' << DLT.getColumnNumber();
+ }
+
+ 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;
+}
+
+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) {
+ if (!Found) {
+ if (MO.isDead())
+ // The register is already marked dead.
+ return true;
+ 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) {
+ MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo);
+ if (!MO || MO->getSubReg())
+ addOperand(MachineOperand::CreateReg(IncomingReg,
+ true /*IsDef*/,
+ true /*IsImp*/));
+}