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https://github.com/c64scene-ar/llvm-6502.git
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s/DebugLoc.InlinedLoc/DebugLoc.InlinedAtLoc/g git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84054 91177308-0d34-0410-b5e6-96231b3b80d8
1211 lines
42 KiB
C++
1211 lines
42 KiB
C++
//===-- lib/CodeGen/MachineInstr.cpp --------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Methods common to all machine instructions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Constants.h"
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#include "llvm/InlineAsm.h"
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#include "llvm/Value.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineMemOperand.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetInstrDesc.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/LeakDetector.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/FoldingSet.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// MachineOperand Implementation
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//===----------------------------------------------------------------------===//
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/// AddRegOperandToRegInfo - Add this register operand to the specified
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/// MachineRegisterInfo. If it is null, then the next/prev fields should be
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/// explicitly nulled out.
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void MachineOperand::AddRegOperandToRegInfo(MachineRegisterInfo *RegInfo) {
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assert(isReg() && "Can only add reg operand to use lists");
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// If the reginfo pointer is null, just explicitly null out or next/prev
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// pointers, to ensure they are not garbage.
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if (RegInfo == 0) {
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Contents.Reg.Prev = 0;
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Contents.Reg.Next = 0;
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return;
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}
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// Otherwise, add this operand to the head of the registers use/def list.
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MachineOperand **Head = &RegInfo->getRegUseDefListHead(getReg());
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// For SSA values, we prefer to keep the definition at the start of the list.
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// we do this by skipping over the definition if it is at the head of the
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// list.
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if (*Head && (*Head)->isDef())
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Head = &(*Head)->Contents.Reg.Next;
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Contents.Reg.Next = *Head;
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if (Contents.Reg.Next) {
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assert(getReg() == Contents.Reg.Next->getReg() &&
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"Different regs on the same list!");
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Contents.Reg.Next->Contents.Reg.Prev = &Contents.Reg.Next;
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}
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Contents.Reg.Prev = Head;
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*Head = this;
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}
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/// RemoveRegOperandFromRegInfo - Remove this register operand from the
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/// MachineRegisterInfo it is linked with.
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void MachineOperand::RemoveRegOperandFromRegInfo() {
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assert(isOnRegUseList() && "Reg operand is not on a use list");
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// Unlink this from the doubly linked list of operands.
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MachineOperand *NextOp = Contents.Reg.Next;
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*Contents.Reg.Prev = NextOp;
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if (NextOp) {
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assert(NextOp->getReg() == getReg() && "Corrupt reg use/def chain!");
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NextOp->Contents.Reg.Prev = Contents.Reg.Prev;
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}
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Contents.Reg.Prev = 0;
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Contents.Reg.Next = 0;
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}
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void MachineOperand::setReg(unsigned Reg) {
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if (getReg() == Reg) return; // No change.
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// Otherwise, we have to change the register. If this operand is embedded
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// into a machine function, we need to update the old and new register's
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// use/def lists.
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if (MachineInstr *MI = getParent())
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if (MachineBasicBlock *MBB = MI->getParent())
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if (MachineFunction *MF = MBB->getParent()) {
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RemoveRegOperandFromRegInfo();
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Contents.Reg.RegNo = Reg;
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AddRegOperandToRegInfo(&MF->getRegInfo());
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return;
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}
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// Otherwise, just change the register, no problem. :)
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Contents.Reg.RegNo = Reg;
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}
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/// ChangeToImmediate - Replace this operand with a new immediate operand of
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/// the specified value. If an operand is known to be an immediate already,
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/// the setImm method should be used.
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void MachineOperand::ChangeToImmediate(int64_t ImmVal) {
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// If this operand is currently a register operand, and if this is in a
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// function, deregister the operand from the register's use/def list.
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if (isReg() && getParent() && getParent()->getParent() &&
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getParent()->getParent()->getParent())
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RemoveRegOperandFromRegInfo();
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OpKind = MO_Immediate;
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Contents.ImmVal = ImmVal;
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}
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/// ChangeToRegister - Replace this operand with a new register operand of
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/// the specified value. If an operand is known to be an register already,
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/// the setReg method should be used.
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void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
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bool isKill, bool isDead, bool isUndef) {
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// If this operand is already a register operand, use setReg to update the
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// register's use/def lists.
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if (isReg()) {
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assert(!isEarlyClobber());
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setReg(Reg);
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} else {
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// Otherwise, change this to a register and set the reg#.
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OpKind = MO_Register;
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Contents.Reg.RegNo = Reg;
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// If this operand is embedded in a function, add the operand to the
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// register's use/def list.
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if (MachineInstr *MI = getParent())
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if (MachineBasicBlock *MBB = MI->getParent())
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if (MachineFunction *MF = MBB->getParent())
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AddRegOperandToRegInfo(&MF->getRegInfo());
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}
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IsDef = isDef;
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IsImp = isImp;
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IsKill = isKill;
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IsDead = isDead;
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IsUndef = isUndef;
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IsEarlyClobber = false;
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SubReg = 0;
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}
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/// isIdenticalTo - Return true if this operand is identical to the specified
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/// operand.
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bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
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if (getType() != Other.getType() ||
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getTargetFlags() != Other.getTargetFlags())
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return false;
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switch (getType()) {
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default: llvm_unreachable("Unrecognized operand type");
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case MachineOperand::MO_Register:
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return getReg() == Other.getReg() && isDef() == Other.isDef() &&
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getSubReg() == Other.getSubReg();
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case MachineOperand::MO_Immediate:
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return getImm() == Other.getImm();
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case MachineOperand::MO_FPImmediate:
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return getFPImm() == Other.getFPImm();
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case MachineOperand::MO_MachineBasicBlock:
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return getMBB() == Other.getMBB();
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case MachineOperand::MO_FrameIndex:
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return getIndex() == Other.getIndex();
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case MachineOperand::MO_ConstantPoolIndex:
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return getIndex() == Other.getIndex() && getOffset() == Other.getOffset();
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case MachineOperand::MO_JumpTableIndex:
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return getIndex() == Other.getIndex();
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case MachineOperand::MO_GlobalAddress:
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return getGlobal() == Other.getGlobal() && getOffset() == Other.getOffset();
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case MachineOperand::MO_ExternalSymbol:
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return !strcmp(getSymbolName(), Other.getSymbolName()) &&
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getOffset() == Other.getOffset();
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}
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}
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/// print - Print the specified machine operand.
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///
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void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
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switch (getType()) {
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case MachineOperand::MO_Register:
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if (getReg() == 0 || TargetRegisterInfo::isVirtualRegister(getReg())) {
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OS << "%reg" << getReg();
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} else {
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// If the instruction is embedded into a basic block, we can find the
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// target info for the instruction.
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if (TM == 0)
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if (const MachineInstr *MI = getParent())
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if (const MachineBasicBlock *MBB = MI->getParent())
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if (const MachineFunction *MF = MBB->getParent())
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TM = &MF->getTarget();
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if (TM)
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OS << "%" << TM->getRegisterInfo()->get(getReg()).Name;
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else
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OS << "%mreg" << getReg();
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}
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if (getSubReg() != 0)
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OS << ':' << getSubReg();
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if (isDef() || isKill() || isDead() || isImplicit() || isUndef() ||
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isEarlyClobber()) {
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OS << '<';
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bool NeedComma = false;
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if (isImplicit()) {
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if (NeedComma) OS << ',';
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OS << (isDef() ? "imp-def" : "imp-use");
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NeedComma = true;
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} else if (isDef()) {
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if (NeedComma) OS << ',';
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if (isEarlyClobber())
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OS << "earlyclobber,";
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OS << "def";
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NeedComma = true;
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}
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if (isKill() || isDead() || isUndef()) {
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if (NeedComma) OS << ',';
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if (isKill()) OS << "kill";
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if (isDead()) OS << "dead";
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if (isUndef()) {
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if (isKill() || isDead())
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OS << ',';
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OS << "undef";
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}
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}
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OS << '>';
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}
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break;
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case MachineOperand::MO_Immediate:
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OS << getImm();
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break;
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case MachineOperand::MO_FPImmediate:
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if (getFPImm()->getType()->isFloatTy())
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OS << getFPImm()->getValueAPF().convertToFloat();
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else
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OS << getFPImm()->getValueAPF().convertToDouble();
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break;
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case MachineOperand::MO_MachineBasicBlock:
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OS << "mbb<"
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<< ((Value*)getMBB()->getBasicBlock())->getName()
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<< "," << (void*)getMBB() << '>';
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break;
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case MachineOperand::MO_FrameIndex:
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OS << "<fi#" << getIndex() << '>';
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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OS << "<cp#" << getIndex();
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if (getOffset()) OS << "+" << getOffset();
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OS << '>';
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break;
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case MachineOperand::MO_JumpTableIndex:
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OS << "<jt#" << getIndex() << '>';
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break;
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case MachineOperand::MO_GlobalAddress:
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OS << "<ga:" << ((Value*)getGlobal())->getName();
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if (getOffset()) OS << "+" << getOffset();
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OS << '>';
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break;
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case MachineOperand::MO_ExternalSymbol:
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OS << "<es:" << getSymbolName();
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if (getOffset()) OS << "+" << getOffset();
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OS << '>';
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break;
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default:
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llvm_unreachable("Unrecognized operand type");
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}
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if (unsigned TF = getTargetFlags())
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OS << "[TF=" << TF << ']';
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}
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//===----------------------------------------------------------------------===//
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// MachineMemOperand Implementation
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//===----------------------------------------------------------------------===//
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MachineMemOperand::MachineMemOperand(const Value *v, unsigned int f,
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int64_t o, uint64_t s, unsigned int a)
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: Offset(o), Size(s), V(v),
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Flags((f & 7) | ((Log2_32(a) + 1) << 3)) {
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assert(getBaseAlignment() == a && "Alignment is not a power of 2!");
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assert((isLoad() || isStore()) && "Not a load/store!");
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}
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/// Profile - Gather unique data for the object.
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///
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void MachineMemOperand::Profile(FoldingSetNodeID &ID) const {
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ID.AddInteger(Offset);
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ID.AddInteger(Size);
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ID.AddPointer(V);
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ID.AddInteger(Flags);
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}
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void MachineMemOperand::refineAlignment(const MachineMemOperand *MMO) {
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// The Value and Offset may differ due to CSE. But the flags and size
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// should be the same.
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assert(MMO->getFlags() == getFlags() && "Flags mismatch!");
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assert(MMO->getSize() == getSize() && "Size mismatch!");
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if (MMO->getBaseAlignment() >= getBaseAlignment()) {
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// Update the alignment value.
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Flags = (Flags & 7) | ((Log2_32(MMO->getBaseAlignment()) + 1) << 3);
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// Also update the base and offset, because the new alignment may
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// not be applicable with the old ones.
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V = MMO->getValue();
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Offset = MMO->getOffset();
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}
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}
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/// getAlignment - Return the minimum known alignment in bytes of the
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/// actual memory reference.
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uint64_t MachineMemOperand::getAlignment() const {
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return MinAlign(getBaseAlignment(), getOffset());
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}
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raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineMemOperand &MMO) {
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assert((MMO.isLoad() || MMO.isStore()) &&
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"SV has to be a load, store or both.");
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if (MMO.isVolatile())
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OS << "Volatile ";
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if (MMO.isLoad())
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OS << "LD";
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if (MMO.isStore())
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OS << "ST";
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OS << MMO.getSize();
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// Print the address information.
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OS << "[";
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if (!MMO.getValue())
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OS << "<unknown>";
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else
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WriteAsOperand(OS, MMO.getValue(), /*PrintType=*/false);
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// If the alignment of the memory reference itself differs from the alignment
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// of the base pointer, print the base alignment explicitly, next to the base
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// pointer.
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if (MMO.getBaseAlignment() != MMO.getAlignment())
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OS << "(align=" << MMO.getBaseAlignment() << ")";
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if (MMO.getOffset() != 0)
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OS << "+" << MMO.getOffset();
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OS << "]";
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// Print the alignment of the reference.
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if (MMO.getBaseAlignment() != MMO.getAlignment() ||
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MMO.getBaseAlignment() != MMO.getSize())
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OS << "(align=" << MMO.getAlignment() << ")";
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return OS;
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}
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//===----------------------------------------------------------------------===//
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// MachineInstr Implementation
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//===----------------------------------------------------------------------===//
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/// MachineInstr ctor - This constructor creates a dummy MachineInstr with
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/// TID NULL and no operands.
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MachineInstr::MachineInstr()
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: TID(0), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0),
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Parent(0), debugLoc(DebugLoc::getUnknownLoc()) {
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// Make sure that we get added to a machine basicblock
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LeakDetector::addGarbageObject(this);
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}
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void MachineInstr::addImplicitDefUseOperands() {
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if (TID->ImplicitDefs)
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for (const unsigned *ImpDefs = TID->ImplicitDefs; *ImpDefs; ++ImpDefs)
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addOperand(MachineOperand::CreateReg(*ImpDefs, true, true));
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if (TID->ImplicitUses)
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for (const unsigned *ImpUses = TID->ImplicitUses; *ImpUses; ++ImpUses)
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addOperand(MachineOperand::CreateReg(*ImpUses, false, true));
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}
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/// MachineInstr ctor - This constructor create a MachineInstr and add the
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/// implicit operands. It reserves space for number of operands specified by
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/// TargetInstrDesc or the numOperands if it is not zero. (for
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/// instructions with variable number of operands).
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MachineInstr::MachineInstr(const TargetInstrDesc &tid, bool NoImp)
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: TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0), Parent(0),
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debugLoc(DebugLoc::getUnknownLoc()) {
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if (!NoImp && TID->getImplicitDefs())
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for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
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NumImplicitOps++;
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if (!NoImp && TID->getImplicitUses())
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for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
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NumImplicitOps++;
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Operands.reserve(NumImplicitOps + TID->getNumOperands());
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if (!NoImp)
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addImplicitDefUseOperands();
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// Make sure that we get added to a machine basicblock
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LeakDetector::addGarbageObject(this);
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}
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/// MachineInstr ctor - As above, but with a DebugLoc.
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MachineInstr::MachineInstr(const TargetInstrDesc &tid, const DebugLoc dl,
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bool NoImp)
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: TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0),
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Parent(0), debugLoc(dl) {
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if (!NoImp && TID->getImplicitDefs())
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for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
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NumImplicitOps++;
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if (!NoImp && TID->getImplicitUses())
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for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
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NumImplicitOps++;
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Operands.reserve(NumImplicitOps + TID->getNumOperands());
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if (!NoImp)
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addImplicitDefUseOperands();
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// Make sure that we get added to a machine basicblock
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LeakDetector::addGarbageObject(this);
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}
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/// MachineInstr ctor - Work exactly the same as the ctor two above, except
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/// that the MachineInstr is created and added to the end of the specified
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/// basic block.
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///
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MachineInstr::MachineInstr(MachineBasicBlock *MBB, const TargetInstrDesc &tid)
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: TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0), Parent(0),
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debugLoc(DebugLoc::getUnknownLoc()) {
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assert(MBB && "Cannot use inserting ctor with null basic block!");
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if (TID->ImplicitDefs)
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for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
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NumImplicitOps++;
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if (TID->ImplicitUses)
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for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
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NumImplicitOps++;
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Operands.reserve(NumImplicitOps + TID->getNumOperands());
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addImplicitDefUseOperands();
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// Make sure that we get added to a machine basicblock
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LeakDetector::addGarbageObject(this);
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MBB->push_back(this); // Add instruction to end of basic block!
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}
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/// MachineInstr ctor - As above, but with a DebugLoc.
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///
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MachineInstr::MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl,
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const TargetInstrDesc &tid)
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: TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0),
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Parent(0), debugLoc(dl) {
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assert(MBB && "Cannot use inserting ctor with null basic block!");
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if (TID->ImplicitDefs)
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for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
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NumImplicitOps++;
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if (TID->ImplicitUses)
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for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
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NumImplicitOps++;
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Operands.reserve(NumImplicitOps + TID->getNumOperands());
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addImplicitDefUseOperands();
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// Make sure that we get added to a machine basicblock
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LeakDetector::addGarbageObject(this);
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MBB->push_back(this); // Add instruction to end of basic block!
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}
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/// MachineInstr ctor - Copies MachineInstr arg exactly
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///
|
|
MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
|
|
: TID(&MI.getDesc()), NumImplicitOps(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);
|
|
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);
|
|
|
|
} 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);
|
|
|
|
// 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);
|
|
}
|
|
}
|
|
|
|
/// 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;
|
|
}
|
|
|
|
|
|
/// isLabel - Returns true if the MachineInstr represents a label.
|
|
///
|
|
bool MachineInstr::isLabel() const {
|
|
return getOpcode() == TargetInstrInfo::DBG_LABEL ||
|
|
getOpcode() == TargetInstrInfo::EH_LABEL ||
|
|
getOpcode() == TargetInstrInfo::GC_LABEL;
|
|
}
|
|
|
|
/// isDebugLabel - Returns true if the MachineInstr represents a debug label.
|
|
///
|
|
bool MachineInstr::isDebugLabel() const {
|
|
return getOpcode() == TargetInstrInfo::DBG_LABEL;
|
|
}
|
|
|
|
/// 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 (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() &&
|
|
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) {
|
|
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 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::dump() const {
|
|
errs() << " " << *this;
|
|
}
|
|
|
|
void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
|
|
// Specialize printing if op#0 is definition
|
|
unsigned StartOp = 0;
|
|
if (getNumOperands() && getOperand(0).isReg() && getOperand(0).isDef()) {
|
|
getOperand(0).print(OS, TM);
|
|
OS << " = ";
|
|
++StartOp; // Don't print this operand again!
|
|
}
|
|
|
|
OS << getDesc().getName();
|
|
|
|
for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
|
|
if (i != StartOp)
|
|
OS << ",";
|
|
OS << " ";
|
|
getOperand(i).print(OS, TM);
|
|
}
|
|
|
|
if (!memoperands_empty()) {
|
|
OS << ", Mem:";
|
|
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";
|
|
}
|
|
|
|
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;
|
|
}
|