//
//===----------------------------------------------------------------------===//
-#include "llvm/Constants.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/Constants.h"
+#include "llvm/Function.h"
+#include "llvm/InlineAsm.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/ErrorHandling.h"
#include "llvm/Support/LeakDetector.h"
#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/Streams.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/FoldingSet.h"
-#include <ostream>
using namespace llvm;
//===----------------------------------------------------------------------===//
*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.
/// 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 isKill, bool isDead, bool isUndef) {
// If this operand is already a register operand, use setReg to update the
// register's use/def lists.
if (isReg()) {
IsImp = isImp;
IsKill = isKill;
IsDead = isDead;
+ IsUndef = isUndef;
IsEarlyClobber = false;
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()) return false;
+ if (getType() != Other.getType() ||
+ getTargetFlags() != Other.getTargetFlags())
+ return false;
switch (getType()) {
- default: assert(0 && "Unrecognized operand type");
+ default: llvm_unreachable("Unrecognized operand type");
case MachineOperand::MO_Register:
return getReg() == Other.getReg() && isDef() == Other.isDef() &&
getSubReg() == Other.getSubReg();
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(std::ostream &OS, const TargetMachine *TM) const {
- raw_os_ostream RawOS(OS);
- print(RawOS, TM);
-}
-
void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
switch (getType()) {
case MachineOperand::MO_Register:
else
OS << "%mreg" << getReg();
}
-
- if (isDef() || isKill() || isDead() || isImplicit() || isEarlyClobber()) {
- OS << "<";
+
+ if (getSubReg() != 0)
+ OS << ':' << getSubReg();
+
+ if (isDef() || isKill() || isDead() || isImplicit() || isUndef() ||
+ isEarlyClobber()) {
+ OS << '<';
bool NeedComma = false;
- if (isImplicit()) {
- if (NeedComma) OS << ",";
- OS << (isDef() ? "imp-def" : "imp-use");
- NeedComma = true;
- } else if (isDef()) {
- if (NeedComma) OS << ",";
+ 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()) {
- if (NeedComma) OS << ",";
+
+ if (isKill() || isDead() || isUndef()) {
+ if (NeedComma) OS << ',';
if (isKill()) OS << "kill";
if (isDead()) OS << "dead";
+ if (isUndef()) {
+ if (isKill() || isDead())
+ OS << ',';
+ OS << "undef";
+ }
}
- OS << ">";
+ OS << '>';
}
break;
case MachineOperand::MO_Immediate:
OS << getImm();
break;
case MachineOperand::MO_FPImmediate:
- if (getFPImm()->getType() == Type::FloatTy) {
+ if (getFPImm()->getType()->isFloatTy())
OS << getFPImm()->getValueAPF().convertToFloat();
- } else {
+ else
OS << getFPImm()->getValueAPF().convertToDouble();
- }
break;
case MachineOperand::MO_MachineBasicBlock:
OS << "mbb<"
<< ((Value*)getMBB()->getBasicBlock())->getName()
- << "," << (void*)getMBB() << ">";
+ << "," << (void*)getMBB() << '>';
break;
case MachineOperand::MO_FrameIndex:
- OS << "<fi#" << getIndex() << ">";
+ OS << "<fi#" << getIndex() << '>';
break;
case MachineOperand::MO_ConstantPoolIndex:
OS << "<cp#" << getIndex();
if (getOffset()) OS << "+" << getOffset();
- OS << ">";
+ OS << '>';
break;
case MachineOperand::MO_JumpTableIndex:
- OS << "<jt#" << getIndex() << ">";
+ OS << "<jt#" << getIndex() << '>';
break;
case MachineOperand::MO_GlobalAddress:
OS << "<ga:" << ((Value*)getGlobal())->getName();
if (getOffset()) OS << "+" << getOffset();
- OS << ">";
+ OS << '>';
break;
case MachineOperand::MO_ExternalSymbol:
OS << "<es:" << getSymbolName();
if (getOffset()) OS << "+" << getOffset();
- OS << ">";
+ OS << '>';
+ break;
+ case MachineOperand::MO_BlockAddress:
+ OS << "<blockaddress: ";
+ WriteAsOperand(OS, getBlockAddress()->getFunction(), /*PrintType=*/false);
+ OS << ", ";
+ WriteAsOperand(OS, getBlockAddress()->getBasicBlock(), /*PrintType=*/false);
+ OS << '>';
break;
default:
- assert(0 && "Unrecognized operand type");
+ llvm_unreachable("Unrecognized operand type");
}
+
+ if (unsigned TF = getTargetFlags())
+ OS << "[TF=" << TF << ']';
}
//===----------------------------------------------------------------------===//
int64_t o, uint64_t s, unsigned int a)
: Offset(o), Size(s), V(v),
Flags((f & 7) | ((Log2_32(a) + 1) << 3)) {
- assert(isPowerOf2_32(a) && "Alignment is not a power of 2!");
+ assert(getBaseAlignment() == a && "Alignment is not a power of 2!");
assert((isLoad() || isStore()) && "Not a load/store!");
}
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), Parent(0) {
+ : TID(0), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0),
+ Parent(0), debugLoc(DebugLoc::getUnknownLoc()) {
// Make sure that we get added to a machine basicblock
LeakDetector::addGarbageObject(this);
}
/// 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), Parent(0) {
+ : TID(&tid), NumImplicitOps(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), MemRefs(0), MemRefsEnd(0),
+ Parent(0), debugLoc(dl) {
if (!NoImp && TID->getImplicitDefs())
for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
NumImplicitOps++;
LeakDetector::addGarbageObject(this);
}
-/// MachineInstr ctor - Work exactly the same as the ctor above, except that the
-/// MachineInstr is created and added to the end of the specified basic block.
+/// 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,
+MachineInstr::MachineInstr(MachineBasicBlock *MBB, const TargetInstrDesc &tid)
+ : TID(&tid), NumImplicitOps(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), Parent(0) {
+ : TID(&tid), NumImplicitOps(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)
/// MachineInstr ctor - Copies MachineInstr arg exactly
///
MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
- : TID(&MI.getDesc()), NumImplicitOps(0), Parent(0) {
+ : TID(&MI.getDesc()), NumImplicitOps(0),
+ MemRefs(MI.MemRefs), MemRefsEnd(MI.MemRefsEnd),
+ Parent(0), debugLoc(MI.getDebugLoc()) {
Operands.reserve(MI.getNumOperands());
// Add operands
addOperand(MI.getOperand(i));
NumImplicitOps = MI.NumImplicitOps;
- // Add memory operands.
- for (std::list<MachineMemOperand>::const_iterator i = MI.memoperands_begin(),
- j = MI.memoperands_end(); i != j; ++i)
- addMemOperand(MF, *i);
-
// Set parent to null.
Parent = 0;
MachineInstr::~MachineInstr() {
LeakDetector::removeGarbageObject(this);
- assert(MemOperands.empty() &&
- "MachineInstr being deleted with live memoperands!");
#ifndef NDEBUG
for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
assert(Operands[i].ParentMI == this && "ParentMI mismatch!");
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) {
// If the operand is a register, update the operand's use list.
if (Op.isReg())
- Operands.back().AddRegOperandToRegInfo(getRegInfo());
+ Operands.back().AddRegOperandToRegInfo(RegInfo);
return;
}
}
// Otherwise, we have to insert a real operand before any implicit ones.
unsigned OpNo = Operands.size()-NumImplicitOps;
- MachineRegisterInfo *RegInfo = getRegInfo();
-
// If this instruction isn't embedded into a function, then we don't need to
// update any operand lists.
if (RegInfo == 0) {
}
}
-/// addMemOperand - Add a MachineMemOperand to the machine instruction,
-/// referencing arbitrary storage.
+/// 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,
- const MachineMemOperand &MO) {
- MemOperands.push_back(MO);
-}
+ MachineMemOperand *MO) {
+ mmo_iterator OldMemRefs = MemRefs;
+ mmo_iterator OldMemRefsEnd = MemRefsEnd;
-/// clearMemOperands - Erase all of this MachineInstr's MachineMemOperands.
-void MachineInstr::clearMemOperands(MachineFunction &MF) {
- MemOperands.clear();
-}
+ 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.
if (!TID->isVariadic())
return NumOperands;
- for (unsigned e = getNumOperands(); NumOperands != e; ++NumOperands) {
- const MachineOperand &MO = getOperand(NumOperands);
+ for (unsigned i = NumOperands, e = getNumOperands(); i != e; ++i) {
+ const MachineOperand &MO = getOperand(i);
if (!MO.isReg() || !MO.isImplicit())
NumOperands++;
}
}
/// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
-/// the specific register or -1 if it is not found. It further tightening
+/// 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 {
return -1;
}
-/// isRegReDefinedByTwoAddr - Given the defined register and the operand index,
-/// check if the register def is a re-definition due to two addr elimination.
-bool MachineInstr::isRegReDefinedByTwoAddr(unsigned Reg, unsigned DefIdx) const{
+/// 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 (getOpcode() == TargetInstrInfo::INLINEASM) {
+ 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() && MO.getReg() == Reg &&
- TID.getOperandConstraint(i, TOI::TIED_TO) == (int)DefIdx)
+ 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 (getOpcode() == TargetInstrInfo::INLINEASM) {
+ 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) {
/// 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) const {
+ bool &SawStore,
+ AliasAnalysis *AA) const {
// Ignore stuff that we obviously can't move.
if (TID->mayStore() || TID->isCall()) {
SawStore = true;
return false;
}
- if (TID->isReturn() || TID->isBranch() || TID->hasUnmodeledSideEffects())
+ if (TID->isTerminator() || TID->hasUnmodeledSideEffects())
return false;
// See if this instruction does a load. If so, we have to guarantee that the
// 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() && !TII->isInvariantLoad(this))
+ 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 laod is volatile, we can't move it.
+ // 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) const {
+ unsigned DstReg,
+ AliasAnalysis *AA) const {
bool SawStore = false;
- if (!getDesc().isRematerializable() ||
- !TII->isTriviallyReMaterializable(this) ||
- !isSafeToMove(TII, SawStore))
+ if (!TII->isTriviallyReMaterializable(this, AA) ||
+ !isSafeToMove(TII, SawStore, AA))
return false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
- MachineOperand &MO = getOperand(i);
+ const MachineOperand &MO = getOperand(i);
if (!MO.isReg())
continue;
// FIXME: For now, do not remat any instruction with register operands.
return true;
// Check the memory reference information for volatile references.
- for (std::list<MachineMemOperand>::const_iterator I = memoperands_begin(),
- E = memoperands_end(); I != E; ++I)
- if (I->isVolatile())
+ for (mmo_iterator I = memoperands_begin(), E = memoperands_end(); I != E; ++I)
+ if ((*I)->isVolatile())
return true;
return false;
}
-void MachineInstr::dump() const {
- cerr << " " << *this;
+/// 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 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;
}
-void MachineInstr::print(std::ostream &OS, const TargetMachine *TM) const {
- raw_os_ostream RawOS(OS);
- print(RawOS, TM);
+void MachineInstr::dump() const {
+ errs() << " " << *this;
}
void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
if (!memoperands_empty()) {
OS << ", Mem:";
- for (std::list<MachineMemOperand>::const_iterator i = memoperands_begin(),
- e = memoperands_end(); i != e; ++i) {
- const MachineMemOperand &MRO = *i;
- const Value *V = MRO.getValue();
-
- assert((MRO.isLoad() || MRO.isStore()) &&
- "SV has to be a load, store or both.");
-
- if (MRO.isVolatile())
- OS << "Volatile ";
-
- if (MRO.isLoad())
- OS << "LD";
- if (MRO.isStore())
- OS << "ST";
-
- OS << "(" << MRO.getSize() << "," << MRO.getAlignment() << ") [";
-
- if (!V)
- OS << "<unknown>";
- else if (!V->getName().empty())
- OS << V->getName();
- else if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V)) {
- PSV->print(OS);
- } else
- OS << V;
-
- OS << " + " << MRO.getOffset() << "]";
+ for (mmo_iterator i = memoperands_begin(), e = memoperands_end();
+ i != e; ++i) {
+ OS << **i;
+ if (next(i) != e)
+ OS << " ";
}
}
+ if (!debugLoc.isUnknown()) {
+ const MachineFunction *MF = getParent()->getParent();
+ DebugLocTuple DLT = MF->getDebugLocTuple(debugLoc);
+ DICompileUnit CU(DLT.Scope);
+ if (!CU.isNull())
+ OS << " [dbg: "
+ << CU.getDirectory() << '/' << CU.getFilename() << ","
+ << DLT.Line << ","
+ << DLT.Col << "]";
+ }
+
OS << "\n";
}
SmallVector<unsigned,4> DeadOps;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
- if (!MO.isReg() || !MO.isUse())
+ if (!MO.isReg() || !MO.isUse() || MO.isUndef())
continue;
unsigned Reg = MO.getReg();
if (!Reg)
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;
}
// If not found, this means an alias of one of the operands is dead. Add a
// new implicit operand if required.
- if (!Found && AddIfNotFound) {
- addOperand(MachineOperand::CreateReg(IncomingReg,
- true /*IsDef*/,
- true /*IsImp*/,
- false /*IsKill*/,
- true /*IsDead*/));
- return true;
- }
- return Found;
+ if (Found || !AddIfNotFound)
+ return Found;
+
+ addOperand(MachineOperand::CreateReg(IncomingReg,
+ true /*IsDef*/,
+ true /*IsImp*/,
+ false /*IsKill*/,
+ true /*IsDead*/));
+ return true;
}
projects / oota-llvm.git / blobdiff