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llvm-mirror/lib/CodeGen/MachineInstr.cpp
stozer 3078d95513 [DebugInfo] Update MachineInstr to help support variadic DBG_VALUE instructions 
Following on from this RFC[0] from a while back, this is the first patch towards
implementing variadic debug values.

This patch specifically adds a set of functions to MachineInstr for performing
operations specific to debug values, and replacing uses of the more general
functions where appropriate. The most prevalent of these is replacing
getOperand(0) with getDebugOperand(0) for debug-value-specific code, as the
operands corresponding to values will no longer be at index 0, but index 2 and
upwards: getDebugOperand(x) == getOperand(x+2). Similar replacements have been
added for the other operands, along with some helper functions to replace
oft-repeated code and operate on a variable number of value operands.

[0] http://lists.llvm.org/pipermail/llvm-dev/2020-February/139376.html<Paste>

Differential Revision: https://reviews.llvm.org/D81852
2020-06-22 16:01:12 +01:00

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//===- lib/CodeGen/MachineInstr.cpp ---------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Methods common to all machine instructions.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallBitVector.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/CodeGen/GlobalISel/RegisterBank.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/ModuleSlotTracker.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/LowLevelTypeImpl.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetIntrinsicInfo.h"
#include "llvm/Target/TargetMachine.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <iterator>
#include <utility>
using namespace llvm;
static const MachineFunction *getMFIfAvailable(const MachineInstr &MI) {
if (const MachineBasicBlock *MBB = MI.getParent())
if (const MachineFunction *MF = MBB->getParent())
return MF;
return nullptr;
}
// Try to crawl up to the machine function and get TRI and IntrinsicInfo from
// it.
static void tryToGetTargetInfo(const MachineInstr &MI,
const TargetRegisterInfo *&TRI,
const MachineRegisterInfo *&MRI,
const TargetIntrinsicInfo *&IntrinsicInfo,
const TargetInstrInfo *&TII) {
if (const MachineFunction *MF = getMFIfAvailable(MI)) {
TRI = MF->getSubtarget().getRegisterInfo();
MRI = &MF->getRegInfo();
IntrinsicInfo = MF->getTarget().getIntrinsicInfo();
TII = MF->getSubtarget().getInstrInfo();
}
}
void MachineInstr::addImplicitDefUseOperands(MachineFunction &MF) {
if (MCID->ImplicitDefs)
for (const MCPhysReg *ImpDefs = MCID->getImplicitDefs(); *ImpDefs;
++ImpDefs)
addOperand(MF, MachineOperand::CreateReg(*ImpDefs, true, true));
if (MCID->ImplicitUses)
for (const MCPhysReg *ImpUses = MCID->getImplicitUses(); *ImpUses;
++ImpUses)
addOperand(MF, MachineOperand::CreateReg(*ImpUses, false, true));
}
/// MachineInstr ctor - This constructor creates a MachineInstr and adds the
/// implicit operands. It reserves space for the number of operands specified by
/// the MCInstrDesc.
MachineInstr::MachineInstr(MachineFunction &MF, const MCInstrDesc &tid,
DebugLoc dl, bool NoImp)
: MCID(&tid), debugLoc(std::move(dl)) {
assert(debugLoc.hasTrivialDestructor() && "Expected trivial destructor");
// Reserve space for the expected number of operands.
if (unsigned NumOps = MCID->getNumOperands() +
MCID->getNumImplicitDefs() + MCID->getNumImplicitUses()) {
CapOperands = OperandCapacity::get(NumOps);
Operands = MF.allocateOperandArray(CapOperands);
}
if (!NoImp)
addImplicitDefUseOperands(MF);
}
/// MachineInstr ctor - Copies MachineInstr arg exactly
///
MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
: MCID(&MI.getDesc()), Info(MI.Info), debugLoc(MI.getDebugLoc()) {
assert(debugLoc.hasTrivialDestructor() && "Expected trivial destructor");
CapOperands = OperandCapacity::get(MI.getNumOperands());
Operands = MF.allocateOperandArray(CapOperands);
// Copy operands.
for (const MachineOperand &MO : MI.operands())
addOperand(MF, MO);
// Copy all the sensible flags.
setFlags(MI.Flags);
}
/// 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 nullptr;
}
/// 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(MachineRegisterInfo &MRI) {
for (MachineOperand &MO : operands())
if (MO.isReg())
MRI.removeRegOperandFromUseList(&MO);
}
/// 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 &MRI) {
for (MachineOperand &MO : operands())
if (MO.isReg())
MRI.addRegOperandToUseList(&MO);
}
void MachineInstr::addOperand(const MachineOperand &Op) {
MachineBasicBlock *MBB = getParent();
assert(MBB && "Use MachineInstrBuilder to add operands to dangling instrs");
MachineFunction *MF = MBB->getParent();
assert(MF && "Use MachineInstrBuilder to add operands to dangling instrs");
addOperand(*MF, Op);
}
/// Move NumOps MachineOperands from Src to Dst, with support for overlapping
/// ranges. If MRI is non-null also update use-def chains.
static void moveOperands(MachineOperand *Dst, MachineOperand *Src,
unsigned NumOps, MachineRegisterInfo *MRI) {
if (MRI)
return MRI->moveOperands(Dst, Src, NumOps);
// MachineOperand is a trivially copyable type so we can just use memmove.
assert(Dst && Src && "Unknown operands");
std::memmove(Dst, Src, NumOps * sizeof(MachineOperand));
}
/// 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(MachineFunction &MF, const MachineOperand &Op) {
assert(MCID && "Cannot add operands before providing an instr descriptor");
// Check if we're adding one of our existing operands.
if (&Op >= Operands && &Op < Operands + NumOperands) {
// This is unusual: MI->addOperand(MI->getOperand(i)).
// If adding Op requires reallocating or moving existing operands around,
// the Op reference could go stale. Support it by copying Op.
MachineOperand CopyOp(Op);
return addOperand(MF, CopyOp);
}
// Find the insert location for the new operand. Implicit registers go at
// the end, everything else goes before the implicit regs.
//
// FIXME: Allow mixed explicit and implicit operands on inline asm.
// InstrEmitter::EmitSpecialNode() is marking inline asm clobbers as
// implicit-defs, but they must not be moved around. See the FIXME in
// InstrEmitter.cpp.
unsigned OpNo = getNumOperands();
bool isImpReg = Op.isReg() && Op.isImplicit();
if (!isImpReg && !isInlineAsm()) {
while (OpNo && Operands[OpNo-1].isReg() && Operands[OpNo-1].isImplicit()) {
--OpNo;
assert(!Operands[OpNo].isTied() && "Cannot move tied operands");
}
}
#ifndef NDEBUG
bool isDebugOp = Op.getType() == MachineOperand::MO_Metadata ||
Op.getType() == MachineOperand::MO_MCSymbol;
// OpNo now points as the desired insertion point. Unless this is a variadic
// instruction, only implicit regs are allowed beyond MCID->getNumOperands().
// RegMask operands go between the explicit and implicit operands.
assert((isImpReg || Op.isRegMask() || MCID->isVariadic() ||
OpNo < MCID->getNumOperands() || isDebugOp) &&
"Trying to add an operand to a machine instr that is already done!");
#endif
MachineRegisterInfo *MRI = getRegInfo();
// Determine if the Operands array needs to be reallocated.
// Save the old capacity and operand array.
OperandCapacity OldCap = CapOperands;
MachineOperand *OldOperands = Operands;
if (!OldOperands || OldCap.getSize() == getNumOperands()) {
CapOperands = OldOperands ? OldCap.getNext() : OldCap.get(1);
Operands = MF.allocateOperandArray(CapOperands);
// Move the operands before the insertion point.
if (OpNo)
moveOperands(Operands, OldOperands, OpNo, MRI);
}
// Move the operands following the insertion point.
if (OpNo != NumOperands)
moveOperands(Operands + OpNo + 1, OldOperands + OpNo, NumOperands - OpNo,
MRI);
++NumOperands;
// Deallocate the old operand array.
if (OldOperands != Operands && OldOperands)
MF.deallocateOperandArray(OldCap, OldOperands);
// Copy Op into place. It still needs to be inserted into the MRI use lists.
MachineOperand *NewMO = new (Operands + OpNo) MachineOperand(Op);
NewMO->ParentMI = this;
// When adding a register operand, tell MRI about it.
if (NewMO->isReg()) {
// Ensure isOnRegUseList() returns false, regardless of Op's status.
NewMO->Contents.Reg.Prev = nullptr;
// Ignore existing ties. This is not a property that can be copied.
NewMO->TiedTo = 0;
// Add the new operand to MRI, but only for instructions in an MBB.
if (MRI)
MRI->addRegOperandToUseList(NewMO);
// The MCID operand information isn't accurate until we start adding
// explicit operands. The implicit operands are added first, then the
// explicits are inserted before them.
if (!isImpReg) {
// Tie uses to defs as indicated in MCInstrDesc.
if (NewMO->isUse()) {
int DefIdx = MCID->getOperandConstraint(OpNo, MCOI::TIED_TO);
if (DefIdx != -1)
tieOperands(DefIdx, OpNo);
}
// If the register operand is flagged as early, mark the operand as such.
if (MCID->getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1)
NewMO->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 < getNumOperands() && "Invalid operand number");
untieRegOperand(OpNo);
#ifndef NDEBUG
// Moving tied operands would break the ties.
for (unsigned i = OpNo + 1, e = getNumOperands(); i != e; ++i)
if (Operands[i].isReg())
assert(!Operands[i].isTied() && "Cannot move tied operands");
#endif
MachineRegisterInfo *MRI = getRegInfo();
if (MRI && Operands[OpNo].isReg())
MRI->removeRegOperandFromUseList(Operands + OpNo);
// Don't call the MachineOperand destructor. A lot of this code depends on
// MachineOperand having a trivial destructor anyway, and adding a call here
// wouldn't make it 'destructor-correct'.
if (unsigned N = NumOperands - 1 - OpNo)
moveOperands(Operands + OpNo, Operands + OpNo + 1, N, MRI);
--NumOperands;
}
void MachineInstr::setExtraInfo(MachineFunction &MF,
ArrayRef<MachineMemOperand *> MMOs,
MCSymbol *PreInstrSymbol,
MCSymbol *PostInstrSymbol,
MDNode *HeapAllocMarker) {
bool HasPreInstrSymbol = PreInstrSymbol != nullptr;
bool HasPostInstrSymbol = PostInstrSymbol != nullptr;
bool HasHeapAllocMarker = HeapAllocMarker != nullptr;
int NumPointers =
MMOs.size() + HasPreInstrSymbol + HasPostInstrSymbol + HasHeapAllocMarker;
// Drop all extra info if there is none.
if (NumPointers <= 0) {
Info.clear();
return;
}
// If more than one pointer, then store out of line. Store heap alloc markers
// out of line because PointerSumType cannot hold more than 4 tag types with
// 32-bit pointers.
// FIXME: Maybe we should make the symbols in the extra info mutable?
else if (NumPointers > 1 || HasHeapAllocMarker) {
Info.set<EIIK_OutOfLine>(MF.createMIExtraInfo(
MMOs, PreInstrSymbol, PostInstrSymbol, HeapAllocMarker));
return;
}
// Otherwise store the single pointer inline.
if (HasPreInstrSymbol)
Info.set<EIIK_PreInstrSymbol>(PreInstrSymbol);
else if (HasPostInstrSymbol)
Info.set<EIIK_PostInstrSymbol>(PostInstrSymbol);
else
Info.set<EIIK_MMO>(MMOs[0]);
}
void MachineInstr::dropMemRefs(MachineFunction &MF) {
if (memoperands_empty())
return;
setExtraInfo(MF, {}, getPreInstrSymbol(), getPostInstrSymbol(),
getHeapAllocMarker());
}
void MachineInstr::setMemRefs(MachineFunction &MF,
ArrayRef<MachineMemOperand *> MMOs) {
if (MMOs.empty()) {
dropMemRefs(MF);
return;
}
setExtraInfo(MF, MMOs, getPreInstrSymbol(), getPostInstrSymbol(),
getHeapAllocMarker());
}
void MachineInstr::addMemOperand(MachineFunction &MF,
MachineMemOperand *MO) {
SmallVector<MachineMemOperand *, 2> MMOs;
MMOs.append(memoperands_begin(), memoperands_end());
MMOs.push_back(MO);
setMemRefs(MF, MMOs);
}
void MachineInstr::cloneMemRefs(MachineFunction &MF, const MachineInstr &MI) {
if (this == &MI)
// Nothing to do for a self-clone!
return;
assert(&MF == MI.getMF() &&
"Invalid machine functions when cloning memory refrences!");
// See if we can just steal the extra info already allocated for the
// instruction. We can do this whenever the pre- and post-instruction symbols
// are the same (including null).
if (getPreInstrSymbol() == MI.getPreInstrSymbol() &&
getPostInstrSymbol() == MI.getPostInstrSymbol() &&
getHeapAllocMarker() == MI.getHeapAllocMarker()) {
Info = MI.Info;
return;
}
// Otherwise, fall back on a copy-based clone.
setMemRefs(MF, MI.memoperands());
}
/// Check to see if the MMOs pointed to by the two MemRefs arrays are
/// identical.
static bool hasIdenticalMMOs(ArrayRef<MachineMemOperand *> LHS,
ArrayRef<MachineMemOperand *> RHS) {
if (LHS.size() != RHS.size())
return false;
auto LHSPointees = make_pointee_range(LHS);
auto RHSPointees = make_pointee_range(RHS);
return std::equal(LHSPointees.begin(), LHSPointees.end(),
RHSPointees.begin());
}
void MachineInstr::cloneMergedMemRefs(MachineFunction &MF,
ArrayRef<const MachineInstr *> MIs) {
// Try handling easy numbers of MIs with simpler mechanisms.
if (MIs.empty()) {
dropMemRefs(MF);
return;
}
if (MIs.size() == 1) {
cloneMemRefs(MF, *MIs[0]);
return;
}
// Because an empty memoperands list provides *no* information and must be
// handled conservatively (assuming the instruction can do anything), the only
// way to merge with it is to drop all other memoperands.
if (MIs[0]->memoperands_empty()) {
dropMemRefs(MF);
return;
}
// Handle the general case.
SmallVector<MachineMemOperand *, 2> MergedMMOs;
// Start with the first instruction.
assert(&MF == MIs[0]->getMF() &&
"Invalid machine functions when cloning memory references!");
MergedMMOs.append(MIs[0]->memoperands_begin(), MIs[0]->memoperands_end());
// Now walk all the other instructions and accumulate any different MMOs.
for (const MachineInstr &MI : make_pointee_range(MIs.slice(1))) {
assert(&MF == MI.getMF() &&
"Invalid machine functions when cloning memory references!");
// Skip MIs with identical operands to the first. This is a somewhat
// arbitrary hack but will catch common cases without being quadratic.
// TODO: We could fully implement merge semantics here if needed.
if (hasIdenticalMMOs(MIs[0]->memoperands(), MI.memoperands()))
continue;
// Because an empty memoperands list provides *no* information and must be
// handled conservatively (assuming the instruction can do anything), the
// only way to merge with it is to drop all other memoperands.
if (MI.memoperands_empty()) {
dropMemRefs(MF);
return;
}
// Otherwise accumulate these into our temporary buffer of the merged state.
MergedMMOs.append(MI.memoperands_begin(), MI.memoperands_end());
}
setMemRefs(MF, MergedMMOs);
}
void MachineInstr::setPreInstrSymbol(MachineFunction &MF, MCSymbol *Symbol) {
// Do nothing if old and new symbols are the same.
if (Symbol == getPreInstrSymbol())
return;
// If there was only one symbol and we're removing it, just clear info.
if (!Symbol && Info.is<EIIK_PreInstrSymbol>()) {
Info.clear();
return;
}
setExtraInfo(MF, memoperands(), Symbol, getPostInstrSymbol(),
getHeapAllocMarker());
}
void MachineInstr::setPostInstrSymbol(MachineFunction &MF, MCSymbol *Symbol) {
// Do nothing if old and new symbols are the same.
if (Symbol == getPostInstrSymbol())
return;
// If there was only one symbol and we're removing it, just clear info.
if (!Symbol && Info.is<EIIK_PostInstrSymbol>()) {
Info.clear();
return;
}
setExtraInfo(MF, memoperands(), getPreInstrSymbol(), Symbol,
getHeapAllocMarker());
}
void MachineInstr::setHeapAllocMarker(MachineFunction &MF, MDNode *Marker) {
// Do nothing if old and new symbols are the same.
if (Marker == getHeapAllocMarker())
return;
setExtraInfo(MF, memoperands(), getPreInstrSymbol(), getPostInstrSymbol(),
Marker);
}
void MachineInstr::cloneInstrSymbols(MachineFunction &MF,
const MachineInstr &MI) {
if (this == &MI)
// Nothing to do for a self-clone!
return;
assert(&MF == MI.getMF() &&
"Invalid machine functions when cloning instruction symbols!");
setPreInstrSymbol(MF, MI.getPreInstrSymbol());
setPostInstrSymbol(MF, MI.getPostInstrSymbol());
setHeapAllocMarker(MF, MI.getHeapAllocMarker());
}
uint16_t MachineInstr::mergeFlagsWith(const MachineInstr &Other) const {
// For now, the just return the union of the flags. If the flags get more
// complicated over time, we might need more logic here.
return getFlags() | Other.getFlags();
}
uint16_t MachineInstr::copyFlagsFromInstruction(const Instruction &I) {
uint16_t MIFlags = 0;
// Copy the wrapping flags.
if (const OverflowingBinaryOperator *OB =
dyn_cast<OverflowingBinaryOperator>(&I)) {
if (OB->hasNoSignedWrap())
MIFlags |= MachineInstr::MIFlag::NoSWrap;
if (OB->hasNoUnsignedWrap())
MIFlags |= MachineInstr::MIFlag::NoUWrap;
}
// Copy the exact flag.
if (const PossiblyExactOperator *PE = dyn_cast<PossiblyExactOperator>(&I))
if (PE->isExact())
MIFlags |= MachineInstr::MIFlag::IsExact;
// Copy the fast-math flags.
if (const FPMathOperator *FP = dyn_cast<FPMathOperator>(&I)) {
const FastMathFlags Flags = FP->getFastMathFlags();
if (Flags.noNaNs())
MIFlags |= MachineInstr::MIFlag::FmNoNans;
if (Flags.noInfs())
MIFlags |= MachineInstr::MIFlag::FmNoInfs;
if (Flags.noSignedZeros())
MIFlags |= MachineInstr::MIFlag::FmNsz;
if (Flags.allowReciprocal())
MIFlags |= MachineInstr::MIFlag::FmArcp;
if (Flags.allowContract())
MIFlags |= MachineInstr::MIFlag::FmContract;
if (Flags.approxFunc())
MIFlags |= MachineInstr::MIFlag::FmAfn;
if (Flags.allowReassoc())
MIFlags |= MachineInstr::MIFlag::FmReassoc;
}
return MIFlags;
}
void MachineInstr::copyIRFlags(const Instruction &I) {
Flags = copyFlagsFromInstruction(I);
}
bool MachineInstr::hasPropertyInBundle(uint64_t Mask, QueryType Type) const {
assert(!isBundledWithPred() && "Must be called on bundle header");
for (MachineBasicBlock::const_instr_iterator MII = getIterator();; ++MII) {
if (MII->getDesc().getFlags() & Mask) {
if (Type == AnyInBundle)
return true;
} else {
if (Type == AllInBundle && !MII->isBundle())
return false;
}
// This was the last instruction in the bundle.
if (!MII->isBundledWithSucc())
return Type == AllInBundle;
}
}
bool MachineInstr::isIdenticalTo(const MachineInstr &Other,
MICheckType Check) const {
// If opcodes or number of operands are not the same then the two
// instructions are obviously not identical.
if (Other.getOpcode() != getOpcode() ||
Other.getNumOperands() != getNumOperands())
return false;
if (isBundle()) {
// We have passed the test above that both instructions have the same
// opcode, so we know that both instructions are bundles here. Let's compare
// MIs inside the bundle.
assert(Other.isBundle() && "Expected that both instructions are bundles.");
MachineBasicBlock::const_instr_iterator I1 = getIterator();
MachineBasicBlock::const_instr_iterator I2 = Other.getIterator();
// Loop until we analysed the last intruction inside at least one of the
// bundles.
while (I1->isBundledWithSucc() && I2->isBundledWithSucc()) {
++I1;
++I2;
if (!I1->isIdenticalTo(*I2, Check))
return false;
}
// If we've reached the end of just one of the two bundles, but not both,
// the instructions are not identical.
if (I1->isBundledWithSucc() || I2->isBundledWithSucc())
return false;
}
// Check operands to make sure they match.
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
const MachineOperand &OMO = Other.getOperand(i);
if (!MO.isReg()) {
if (!MO.isIdenticalTo(OMO))
return false;
continue;
}
// Clients may or may not want to ignore defs when testing for equality.
// For example, machine CSE pass only cares about finding common
// subexpressions, so it's safe to ignore virtual register defs.
if (MO.isDef()) {
if (Check == IgnoreDefs)
continue;
else if (Check == IgnoreVRegDefs) {
if (!Register::isVirtualRegister(MO.getReg()) ||
!Register::isVirtualRegister(OMO.getReg()))
if (!MO.isIdenticalTo(OMO))
return false;
} else {
if (!MO.isIdenticalTo(OMO))
return false;
if (Check == CheckKillDead && MO.isDead() != OMO.isDead())
return false;
}
} else {
if (!MO.isIdenticalTo(OMO))
return false;
if (Check == CheckKillDead && MO.isKill() != OMO.isKill())
return false;
}
}
// If DebugLoc does not match then two debug instructions are not identical.
if (isDebugInstr())
if (getDebugLoc() && Other.getDebugLoc() &&
getDebugLoc() != Other.getDebugLoc())
return false;
return true;
}
const MachineFunction *MachineInstr::getMF() const {
return getParent()->getParent();
}
MachineInstr *MachineInstr::removeFromParent() {
assert(getParent() && "Not embedded in a basic block!");
return getParent()->remove(this);
}
MachineInstr *MachineInstr::removeFromBundle() {
assert(getParent() && "Not embedded in a basic block!");
return getParent()->remove_instr(this);
}
void MachineInstr::eraseFromParent() {
assert(getParent() && "Not embedded in a basic block!");
getParent()->erase(this);
}
void MachineInstr::eraseFromParentAndMarkDBGValuesForRemoval() {
assert(getParent() && "Not embedded in a basic block!");
MachineBasicBlock *MBB = getParent();
MachineFunction *MF = MBB->getParent();
assert(MF && "Not embedded in a function!");
MachineInstr *MI = (MachineInstr *)this;
MachineRegisterInfo &MRI = MF->getRegInfo();
for (const MachineOperand &MO : MI->operands()) {
if (!MO.isReg() || !MO.isDef())
continue;
Register Reg = MO.getReg();
if (!Reg.isVirtual())
continue;
MRI.markUsesInDebugValueAsUndef(Reg);
}
MI->eraseFromParent();
}
void MachineInstr::eraseFromBundle() {
assert(getParent() && "Not embedded in a basic block!");
getParent()->erase_instr(this);
}
bool MachineInstr::isCandidateForCallSiteEntry(QueryType Type) const {
if (!isCall(Type))
return false;
switch (getOpcode()) {
case TargetOpcode::PATCHABLE_EVENT_CALL:
case TargetOpcode::PATCHABLE_TYPED_EVENT_CALL:
case TargetOpcode::PATCHPOINT:
case TargetOpcode::STACKMAP:
case TargetOpcode::STATEPOINT:
return false;
}
return true;
}
bool MachineInstr::shouldUpdateCallSiteInfo() const {
if (isBundle())
return isCandidateForCallSiteEntry(MachineInstr::AnyInBundle);
return isCandidateForCallSiteEntry();
}
unsigned MachineInstr::getNumExplicitOperands() const {
unsigned NumOperands = MCID->getNumOperands();
if (!MCID->isVariadic())
return NumOperands;
for (unsigned I = NumOperands, E = getNumOperands(); I != E; ++I) {
const MachineOperand &MO = getOperand(I);
// The operands must always be in the following order:
// - explicit reg defs,
// - other explicit operands (reg uses, immediates, etc.),
// - implicit reg defs
// - implicit reg uses
if (MO.isReg() && MO.isImplicit())
break;
++NumOperands;
}
return NumOperands;
}
unsigned MachineInstr::getNumExplicitDefs() const {
unsigned NumDefs = MCID->getNumDefs();
if (!MCID->isVariadic())
return NumDefs;
for (unsigned I = NumDefs, E = getNumOperands(); I != E; ++I) {
const MachineOperand &MO = getOperand(I);
if (!MO.isReg() || !MO.isDef() || MO.isImplicit())
break;
++NumDefs;
}
return NumDefs;
}
void MachineInstr::bundleWithPred() {
assert(!isBundledWithPred() && "MI is already bundled with its predecessor");
setFlag(BundledPred);
MachineBasicBlock::instr_iterator Pred = getIterator();
--Pred;
assert(!Pred->isBundledWithSucc() && "Inconsistent bundle flags");
Pred->setFlag(BundledSucc);
}
void MachineInstr::bundleWithSucc() {
assert(!isBundledWithSucc() && "MI is already bundled with its successor");
setFlag(BundledSucc);
MachineBasicBlock::instr_iterator Succ = getIterator();
++Succ;
assert(!Succ->isBundledWithPred() && "Inconsistent bundle flags");
Succ->setFlag(BundledPred);
}
void MachineInstr::unbundleFromPred() {
assert(isBundledWithPred() && "MI isn't bundled with its predecessor");
clearFlag(BundledPred);
MachineBasicBlock::instr_iterator Pred = getIterator();
--Pred;
assert(Pred->isBundledWithSucc() && "Inconsistent bundle flags");
Pred->clearFlag(BundledSucc);
}
void MachineInstr::unbundleFromSucc() {
assert(isBundledWithSucc() && "MI isn't bundled with its successor");
clearFlag(BundledSucc);
MachineBasicBlock::instr_iterator Succ = getIterator();
++Succ;
assert(Succ->isBundledWithPred() && "Inconsistent bundle flags");
Succ->clearFlag(BundledPred);
}
bool MachineInstr::isStackAligningInlineAsm() const {
if (isInlineAsm()) {
unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
return true;
}
return false;
}
InlineAsm::AsmDialect MachineInstr::getInlineAsmDialect() const {
assert(isInlineAsm() && "getInlineAsmDialect() only works for inline asms!");
unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
return InlineAsm::AsmDialect((ExtraInfo & InlineAsm::Extra_AsmDialect) != 0);
}
int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx,
unsigned *GroupNo) const {
assert(isInlineAsm() && "Expected an inline asm instruction");
assert(OpIdx < getNumOperands() && "OpIdx out of range");
// Ignore queries about the initial operands.
if (OpIdx < InlineAsm::MIOp_FirstOperand)
return -1;
unsigned Group = 0;
unsigned NumOps;
for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
i += NumOps) {
const MachineOperand &FlagMO = getOperand(i);
// If we reach the implicit register operands, stop looking.
if (!FlagMO.isImm())
return -1;
NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
if (i + NumOps > OpIdx) {
if (GroupNo)
*GroupNo = Group;
return i;
}
++Group;
}
return -1;
}
const DILabel *MachineInstr::getDebugLabel() const {
assert(isDebugLabel() && "not a DBG_LABEL");
return cast<DILabel>(getOperand(0).getMetadata());
}
const MachineOperand &MachineInstr::getDebugVariableOp() const {
assert(isDebugValue() && "not a DBG_VALUE");
return getOperand(2);
}
MachineOperand &MachineInstr::getDebugVariableOp() {
assert(isDebugValue() && "not a DBG_VALUE");
return getOperand(2);
}
const DILocalVariable *MachineInstr::getDebugVariable() const {
assert(isDebugValue() && "not a DBG_VALUE");
return cast<DILocalVariable>(getOperand(2).getMetadata());
}
MachineOperand &MachineInstr::getDebugExpressionOp() {
assert(isDebugValue() && "not a DBG_VALUE");
return getOperand(3);
}
const DIExpression *MachineInstr::getDebugExpression() const {
assert(isDebugValue() && "not a DBG_VALUE");
return cast<DIExpression>(getOperand(3).getMetadata());
}
bool MachineInstr::isDebugEntryValue() const {
return isDebugValue() && getDebugExpression()->isEntryValue();
}
const TargetRegisterClass*
MachineInstr::getRegClassConstraint(unsigned OpIdx,
const TargetInstrInfo *TII,
const TargetRegisterInfo *TRI) const {
assert(getParent() && "Can't have an MBB reference here!");
assert(getMF() && "Can't have an MF reference here!");
const MachineFunction &MF = *getMF();
// Most opcodes have fixed constraints in their MCInstrDesc.
if (!isInlineAsm())
return TII->getRegClass(getDesc(), OpIdx, TRI, MF);
if (!getOperand(OpIdx).isReg())
return nullptr;
// For tied uses on inline asm, get the constraint from the def.
unsigned DefIdx;
if (getOperand(OpIdx).isUse() && isRegTiedToDefOperand(OpIdx, &DefIdx))
OpIdx = DefIdx;
// Inline asm stores register class constraints in the flag word.
int FlagIdx = findInlineAsmFlagIdx(OpIdx);
if (FlagIdx < 0)
return nullptr;
unsigned Flag = getOperand(FlagIdx).getImm();
unsigned RCID;
if ((InlineAsm::getKind(Flag) == InlineAsm::Kind_RegUse ||
InlineAsm::getKind(Flag) == InlineAsm::Kind_RegDef ||
InlineAsm::getKind(Flag) == InlineAsm::Kind_RegDefEarlyClobber) &&
InlineAsm::hasRegClassConstraint(Flag, RCID))
return TRI->getRegClass(RCID);
// Assume that all registers in a memory operand are pointers.
if (InlineAsm::getKind(Flag) == InlineAsm::Kind_Mem)
return TRI->getPointerRegClass(MF);
return nullptr;
}
const TargetRegisterClass *MachineInstr::getRegClassConstraintEffectForVReg(
Register Reg, const TargetRegisterClass *CurRC, const TargetInstrInfo *TII,
const TargetRegisterInfo *TRI, bool ExploreBundle) const {
// Check every operands inside the bundle if we have
// been asked to.
if (ExploreBundle)
for (ConstMIBundleOperands OpndIt(*this); OpndIt.isValid() && CurRC;
++OpndIt)
CurRC = OpndIt->getParent()->getRegClassConstraintEffectForVRegImpl(
OpndIt.getOperandNo(), Reg, CurRC, TII, TRI);
else
// Otherwise, just check the current operands.
for (unsigned i = 0, e = NumOperands; i < e && CurRC; ++i)
CurRC = getRegClassConstraintEffectForVRegImpl(i, Reg, CurRC, TII, TRI);
return CurRC;
}
const TargetRegisterClass *MachineInstr::getRegClassConstraintEffectForVRegImpl(
unsigned OpIdx, Register Reg, const TargetRegisterClass *CurRC,
const TargetInstrInfo *TII, const TargetRegisterInfo *TRI) const {
assert(CurRC && "Invalid initial register class");
// Check if Reg is constrained by some of its use/def from MI.
const MachineOperand &MO = getOperand(OpIdx);
if (!MO.isReg() || MO.getReg() != Reg)
return CurRC;
// If yes, accumulate the constraints through the operand.
return getRegClassConstraintEffect(OpIdx, CurRC, TII, TRI);
}
const TargetRegisterClass *MachineInstr::getRegClassConstraintEffect(
unsigned OpIdx, const TargetRegisterClass *CurRC,
const TargetInstrInfo *TII, const TargetRegisterInfo *TRI) const {
const TargetRegisterClass *OpRC = getRegClassConstraint(OpIdx, TII, TRI);
const MachineOperand &MO = getOperand(OpIdx);
assert(MO.isReg() &&
"Cannot get register constraints for non-register operand");
assert(CurRC && "Invalid initial register class");
if (unsigned SubIdx = MO.getSubReg()) {
if (OpRC)
CurRC = TRI->getMatchingSuperRegClass(CurRC, OpRC, SubIdx);
else
CurRC = TRI->getSubClassWithSubReg(CurRC, SubIdx);
} else if (OpRC)
CurRC = TRI->getCommonSubClass(CurRC, OpRC);
return CurRC;
}
/// Return the number of instructions inside the MI bundle, not counting the
/// header instruction.
unsigned MachineInstr::getBundleSize() const {
MachineBasicBlock::const_instr_iterator I = getIterator();
unsigned Size = 0;
while (I->isBundledWithSucc()) {
++Size;
++I;
}
return Size;
}
/// Returns true if the MachineInstr has an implicit-use operand of exactly
/// the given register (not considering sub/super-registers).
bool MachineInstr::hasRegisterImplicitUseOperand(Register Reg) const {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (MO.isReg() && MO.isUse() && MO.isImplicit() && MO.getReg() == Reg)
return true;
}
return false;
}
/// 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(
Register 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;
Register MOReg = MO.getReg();
if (!MOReg)
continue;
if (MOReg == Reg || (TRI && Reg && MOReg && TRI->regsOverlap(MOReg, Reg)))
if (!isKill || MO.isKill())
return i;
}
return -1;
}
/// readsWritesVirtualRegister - Return a pair of bools (reads, writes)
/// indicating if this instruction reads or writes Reg. This also considers
/// partial defines.
std::pair<bool,bool>
MachineInstr::readsWritesVirtualRegister(Register Reg,
SmallVectorImpl<unsigned> *Ops) const {
bool PartDef = false; // Partial redefine.
bool FullDef = false; // Full define.
bool Use = false;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (!MO.isReg() || MO.getReg() != Reg)
continue;
if (Ops)
Ops->push_back(i);
if (MO.isUse())
Use |= !MO.isUndef();
else if (MO.getSubReg() && !MO.isUndef())
// A partial def undef doesn't count as reading the register.
PartDef = true;
else
FullDef = true;
}
// A partial redefine uses Reg unless there is also a full define.
return std::make_pair(Use || (PartDef && !FullDef), PartDef || FullDef);
}
/// findRegisterDefOperandIdx() - Returns the operand index that is a def of
/// the specified register or -1 if it is not found. If isDead is true, defs
/// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
/// also checks if there is a def of a super-register.
int
MachineInstr::findRegisterDefOperandIdx(Register Reg, bool isDead, bool Overlap,
const TargetRegisterInfo *TRI) const {
bool isPhys = Register::isPhysicalRegister(Reg);
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
// Accept regmask operands when Overlap is set.
// Ignore them when looking for a specific def operand (Overlap == false).
if (isPhys && Overlap && MO.isRegMask() && MO.clobbersPhysReg(Reg))
return i;
if (!MO.isReg() || !MO.isDef())
continue;
Register MOReg = MO.getReg();
bool Found = (MOReg == Reg);
if (!Found && TRI && isPhys && Register::isPhysicalRegister(MOReg)) {
if (Overlap)
Found = TRI->regsOverlap(MOReg, Reg);
else
Found = TRI->isSubRegister(MOReg, Reg);
}
if (Found && (!isDead || MO.isDead()))
return i;
}
return -1;
}
/// findFirstPredOperandIdx() - Find the index of the first operand in the
/// operand list that is used to represent the predicate. It returns -1 if
/// none is found.
int MachineInstr::findFirstPredOperandIdx() const {
// Don't call MCID.findFirstPredOperandIdx() because this variant
// is sometimes called on an instruction that's not yet complete, and
// so the number of operands is less than the MCID indicates. In
// particular, the PTX target does this.
const MCInstrDesc &MCID = getDesc();
if (MCID.isPredicable()) {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (MCID.OpInfo[i].isPredicate())
return i;
}
return -1;
}
// MachineOperand::TiedTo is 4 bits wide.
const unsigned TiedMax = 15;
/// tieOperands - Mark operands at DefIdx and UseIdx as tied to each other.
///
/// Use and def operands can be tied together, indicated by a non-zero TiedTo
/// field. TiedTo can have these values:
///
/// 0: Operand is not tied to anything.
/// 1 to TiedMax-1: Tied to getOperand(TiedTo-1).
/// TiedMax: Tied to an operand >= TiedMax-1.
///
/// The tied def must be one of the first TiedMax operands on a normal
/// instruction. INLINEASM instructions allow more tied defs.
///
void MachineInstr::tieOperands(unsigned DefIdx, unsigned UseIdx) {
MachineOperand &DefMO = getOperand(DefIdx);
MachineOperand &UseMO = getOperand(UseIdx);
assert(DefMO.isDef() && "DefIdx must be a def operand");
assert(UseMO.isUse() && "UseIdx must be a use operand");
assert(!DefMO.isTied() && "Def is already tied to another use");
assert(!UseMO.isTied() && "Use is already tied to another def");
if (DefIdx < TiedMax)
UseMO.TiedTo = DefIdx + 1;
else {
// Inline asm can use the group descriptors to find tied operands, but on
// normal instruction, the tied def must be within the first TiedMax
// operands.
assert(isInlineAsm() && "DefIdx out of range");
UseMO.TiedTo = TiedMax;
}
// UseIdx can be out of range, we'll search for it in findTiedOperandIdx().
DefMO.TiedTo = std::min(UseIdx + 1, TiedMax);
}
/// Given the index of a tied register operand, find the operand it is tied to.
/// Defs are tied to uses and vice versa. Returns the index of the tied operand
/// which must exist.
unsigned MachineInstr::findTiedOperandIdx(unsigned OpIdx) const {
const MachineOperand &MO = getOperand(OpIdx);
assert(MO.isTied() && "Operand isn't tied");
// Normally TiedTo is in range.
if (MO.TiedTo < TiedMax)
return MO.TiedTo - 1;
// Uses on normal instructions can be out of range.
if (!isInlineAsm()) {
// Normal tied defs must be in the 0..TiedMax-1 range.
if (MO.isUse())
return TiedMax - 1;
// MO is a def. Search for the tied use.
for (unsigned i = TiedMax - 1, e = getNumOperands(); i != e; ++i) {
const MachineOperand &UseMO = getOperand(i);
if (UseMO.isReg() && UseMO.isUse() && UseMO.TiedTo == OpIdx + 1)
return i;
}
llvm_unreachable("Can't find tied use");
}
// Now deal with inline asm by parsing the operand group descriptor flags.
// Find the beginning of each operand group.
SmallVector<unsigned, 8> GroupIdx;
unsigned OpIdxGroup = ~0u;
unsigned NumOps;
for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
i += NumOps) {
const MachineOperand &FlagMO = getOperand(i);
assert(FlagMO.isImm() && "Invalid tied operand on inline asm");
unsigned CurGroup = GroupIdx.size();
GroupIdx.push_back(i);
NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
// OpIdx belongs to this operand group.
if (OpIdx > i && OpIdx < i + NumOps)
OpIdxGroup = CurGroup;
unsigned TiedGroup;
if (!InlineAsm::isUseOperandTiedToDef(FlagMO.getImm(), TiedGroup))
continue;
// Operands in this group are tied to operands in TiedGroup which must be
// earlier. Find the number of operands between the two groups.
unsigned Delta = i - GroupIdx[TiedGroup];
// OpIdx is a use tied to TiedGroup.
if (OpIdxGroup == CurGroup)
return OpIdx - Delta;
// OpIdx is a def tied to this use group.
if (OpIdxGroup == TiedGroup)
return OpIdx + Delta;
}
llvm_unreachable("Invalid tied operand on inline asm");
}
/// clearKillInfo - Clears kill flags on all operands.
///
void MachineInstr::clearKillInfo() {
for (MachineOperand &MO : operands()) {
if (MO.isReg() && MO.isUse())
MO.setIsKill(false);
}
}
void MachineInstr::substituteRegister(Register FromReg, Register ToReg,
unsigned SubIdx,
const TargetRegisterInfo &RegInfo) {
if (Register::isPhysicalRegister(ToReg)) {
if (SubIdx)
ToReg = RegInfo.getSubReg(ToReg, SubIdx);
for (MachineOperand &MO : operands()) {
if (!MO.isReg() || MO.getReg() != FromReg)
continue;
MO.substPhysReg(ToReg, RegInfo);
}
} else {
for (MachineOperand &MO : operands()) {
if (!MO.isReg() || MO.getReg() != FromReg)
continue;
MO.substVirtReg(ToReg, SubIdx, RegInfo);
}
}
}
/// isSafeToMove - Return true if it is safe to move this instruction. If
/// SawStore is set to true, it means that there is a store (or call) between
/// the instruction's location and its intended destination.
bool MachineInstr::isSafeToMove(AAResults *AA, bool &SawStore) const {
// Ignore stuff that we obviously can't move.
//
// Treat volatile loads as stores. This is not strictly necessary for
// volatiles, but it is required for atomic loads. It is not allowed to move
// a load across an atomic load with Ordering > Monotonic.
if (mayStore() || isCall() || isPHI() ||
(mayLoad() && hasOrderedMemoryRef())) {
SawStore = true;
return false;
}
if (isPosition() || isDebugInstr() || isTerminator() ||
mayRaiseFPException() || hasUnmodeledSideEffects())
return false;
// See if this instruction does a load. If so, we have to guarantee that the
// loaded value doesn't change between the load and the its intended
// destination. The check for isInvariantLoad gives the targe the chance to
// classify the load as always returning a constant, e.g. a constant pool
// load.
if (mayLoad() && !isDereferenceableInvariantLoad(AA))
// Otherwise, this is a real load. If there is a store between the load and
// end of block, we can't move it.
return !SawStore;
return true;
}
bool MachineInstr::mayAlias(AAResults *AA, const MachineInstr &Other,
bool UseTBAA) const {
const MachineFunction *MF = getMF();
const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
const MachineFrameInfo &MFI = MF->getFrameInfo();
// If neither instruction stores to memory, they can't alias in any
// meaningful way, even if they read from the same address.
if (!mayStore() && !Other.mayStore())
return false;
// Both instructions must be memory operations to be able to alias.
if (!mayLoadOrStore() || !Other.mayLoadOrStore())
return false;
// Let the target decide if memory accesses cannot possibly overlap.
if (TII->areMemAccessesTriviallyDisjoint(*this, Other))
return false;
// FIXME: Need to handle multiple memory operands to support all targets.
if (!hasOneMemOperand() || !Other.hasOneMemOperand())
return true;
MachineMemOperand *MMOa = *memoperands_begin();
MachineMemOperand *MMOb = *Other.memoperands_begin();
// The following interface to AA is fashioned after DAGCombiner::isAlias
// and operates with MachineMemOperand offset with some important
// assumptions:
// - LLVM fundamentally assumes flat address spaces.
// - MachineOperand offset can *only* result from legalization and
// cannot affect queries other than the trivial case of overlap
// checking.
// - These offsets never wrap and never step outside
// of allocated objects.
// - There should never be any negative offsets here.
//
// FIXME: Modify API to hide this math from "user"
// Even before we go to AA we can reason locally about some
// memory objects. It can save compile time, and possibly catch some
// corner cases not currently covered.
int64_t OffsetA = MMOa->getOffset();
int64_t OffsetB = MMOb->getOffset();
int64_t MinOffset = std::min(OffsetA, OffsetB);
uint64_t WidthA = MMOa->getSize();
uint64_t WidthB = MMOb->getSize();
bool KnownWidthA = WidthA != MemoryLocation::UnknownSize;
bool KnownWidthB = WidthB != MemoryLocation::UnknownSize;
const Value *ValA = MMOa->getValue();
const Value *ValB = MMOb->getValue();
bool SameVal = (ValA && ValB && (ValA == ValB));
if (!SameVal) {
const PseudoSourceValue *PSVa = MMOa->getPseudoValue();
const PseudoSourceValue *PSVb = MMOb->getPseudoValue();
if (PSVa && ValB && !PSVa->mayAlias(&MFI))
return false;
if (PSVb && ValA && !PSVb->mayAlias(&MFI))
return false;
if (PSVa && PSVb && (PSVa == PSVb))
SameVal = true;
}
if (SameVal) {
if (!KnownWidthA || !KnownWidthB)
return true;
int64_t MaxOffset = std::max(OffsetA, OffsetB);
int64_t LowWidth = (MinOffset == OffsetA) ? WidthA : WidthB;
return (MinOffset + LowWidth > MaxOffset);
}
if (!AA)
return true;
if (!ValA || !ValB)
return true;
assert((OffsetA >= 0) && "Negative MachineMemOperand offset");
assert((OffsetB >= 0) && "Negative MachineMemOperand offset");
int64_t OverlapA = KnownWidthA ? WidthA + OffsetA - MinOffset
: MemoryLocation::UnknownSize;
int64_t OverlapB = KnownWidthB ? WidthB + OffsetB - MinOffset
: MemoryLocation::UnknownSize;
AliasResult AAResult = AA->alias(
MemoryLocation(ValA, OverlapA,
UseTBAA ? MMOa->getAAInfo() : AAMDNodes()),
MemoryLocation(ValB, OverlapB,
UseTBAA ? MMOb->getAAInfo() : AAMDNodes()));
return (AAResult != NoAlias);
}
/// hasOrderedMemoryRef - Return true if this instruction may have an ordered
/// or volatile memory reference, or if the information describing the memory
/// reference is not available. Return false if it is known to have no ordered
/// memory references.
bool MachineInstr::hasOrderedMemoryRef() const {
// An instruction known never to access memory won't have a volatile access.
if (!mayStore() &&
!mayLoad() &&
!isCall() &&
!hasUnmodeledSideEffects())
return false;
// Otherwise, if the instruction has no memory reference information,
// conservatively assume it wasn't preserved.
if (memoperands_empty())
return true;
// Check if any of our memory operands are ordered.
return llvm::any_of(memoperands(), [](const MachineMemOperand *MMO) {
return !MMO->isUnordered();
});
}
/// isDereferenceableInvariantLoad - Return true if this instruction will never
/// trap and is loading from a location whose value is invariant across a run of
/// this function.
bool MachineInstr::isDereferenceableInvariantLoad(AAResults *AA) const {
// If the instruction doesn't load at all, it isn't an invariant load.
if (!mayLoad())
return false;
// If the instruction has lost its memoperands, conservatively assume that
// it may not be an invariant load.
if (memoperands_empty())
return false;
const MachineFrameInfo &MFI = getParent()->getParent()->getFrameInfo();
for (MachineMemOperand *MMO : memoperands()) {
if (!MMO->isUnordered())
// If the memory operand has ordering side effects, we can't move the
// instruction. Such an instruction is technically an invariant load,
// but the caller code would need updated to expect that.
return false;
if (MMO->isStore()) return false;
if (MMO->isInvariant() && MMO->isDereferenceable())
continue;
// A load from a constant PseudoSourceValue is invariant.
if (const PseudoSourceValue *PSV = MMO->getPseudoValue())
if (PSV->isConstant(&MFI))
continue;
if (const Value *V = MMO->getValue()) {
// If we have an AliasAnalysis, ask it whether the memory is constant.
if (AA &&
AA->pointsToConstantMemory(
MemoryLocation(V, MMO->getSize(), MMO->getAAInfo())))
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");
Register Reg = getOperand(1).getReg();
for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)
if (getOperand(i).getReg() != Reg)
return 0;
return Reg;
}
bool MachineInstr::hasUnmodeledSideEffects() const {
if (hasProperty(MCID::UnmodeledSideEffects))
return true;
if (isInlineAsm()) {
unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
return true;
}
return false;
}
bool MachineInstr::isLoadFoldBarrier() const {
return mayStore() || isCall() || hasUnmodeledSideEffects();
}
/// allDefsAreDead - Return true if all the defs of this instruction are dead.
///
bool MachineInstr::allDefsAreDead() const {
for (const MachineOperand &MO : operands()) {
if (!MO.isReg() || MO.isUse())
continue;
if (!MO.isDead())
return false;
}
return true;
}
/// copyImplicitOps - Copy implicit register operands from specified
/// instruction to this instruction.
void MachineInstr::copyImplicitOps(MachineFunction &MF,
const MachineInstr &MI) {
for (unsigned i = MI.getDesc().getNumOperands(), e = MI.getNumOperands();
i != e; ++i) {
const MachineOperand &MO = MI.getOperand(i);
if ((MO.isReg() && MO.isImplicit()) || MO.isRegMask())
addOperand(MF, MO);
}
}
bool MachineInstr::hasComplexRegisterTies() const {
const MCInstrDesc &MCID = getDesc();
for (unsigned I = 0, E = getNumOperands(); I < E; ++I) {
const auto &Operand = getOperand(I);
if (!Operand.isReg() || Operand.isDef())
// Ignore the defined registers as MCID marks only the uses as tied.
continue;
int ExpectedTiedIdx = MCID.getOperandConstraint(I, MCOI::TIED_TO);
int TiedIdx = Operand.isTied() ? int(findTiedOperandIdx(I)) : -1;
if (ExpectedTiedIdx != TiedIdx)
return true;
}
return false;
}
LLT MachineInstr::getTypeToPrint(unsigned OpIdx, SmallBitVector &PrintedTypes,
const MachineRegisterInfo &MRI) const {
const MachineOperand &Op = getOperand(OpIdx);
if (!Op.isReg())
return LLT{};
if (isVariadic() || OpIdx >= getNumExplicitOperands())
return MRI.getType(Op.getReg());
auto &OpInfo = getDesc().OpInfo[OpIdx];
if (!OpInfo.isGenericType())
return MRI.getType(Op.getReg());
if (PrintedTypes[OpInfo.getGenericTypeIndex()])
return LLT{};
LLT TypeToPrint = MRI.getType(Op.getReg());
// Don't mark the type index printed if it wasn't actually printed: maybe
// another operand with the same type index has an actual type attached:
if (TypeToPrint.isValid())
PrintedTypes.set(OpInfo.getGenericTypeIndex());
return TypeToPrint;
}
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void MachineInstr::dump() const {
dbgs() << " ";
print(dbgs());
}
LLVM_DUMP_METHOD void MachineInstr::dumprImpl(
const MachineRegisterInfo &MRI, unsigned Depth, unsigned MaxDepth,
SmallPtrSetImpl<const MachineInstr *> &AlreadySeenInstrs) const {
if (Depth >= MaxDepth)
return;
if (!AlreadySeenInstrs.insert(this).second)
return;
// PadToColumn always inserts at least one space.
// Don't mess up the alignment if we don't want any space.
if (Depth)
fdbgs().PadToColumn(Depth * 2);
print(fdbgs());
for (const MachineOperand &MO : operands()) {
if (!MO.isReg() || MO.isDef())
continue;
Register Reg = MO.getReg();
if (Reg.isPhysical())
continue;
const MachineInstr *NewMI = MRI.getUniqueVRegDef(Reg);
if (NewMI == nullptr)
continue;
NewMI->dumprImpl(MRI, Depth + 1, MaxDepth, AlreadySeenInstrs);
}
}
LLVM_DUMP_METHOD void MachineInstr::dumpr(const MachineRegisterInfo &MRI,
unsigned MaxDepth) const {
SmallPtrSet<const MachineInstr *, 16> AlreadySeenInstrs;
dumprImpl(MRI, 0, MaxDepth, AlreadySeenInstrs);
}
#endif
void MachineInstr::print(raw_ostream &OS, bool IsStandalone, bool SkipOpers,
bool SkipDebugLoc, bool AddNewLine,
const TargetInstrInfo *TII) const {
const Module *M = nullptr;
const Function *F = nullptr;
if (const MachineFunction *MF = getMFIfAvailable(*this)) {
F = &MF->getFunction();
M = F->getParent();
if (!TII)
TII = MF->getSubtarget().getInstrInfo();
}
ModuleSlotTracker MST(M);
if (F)
MST.incorporateFunction(*F);
print(OS, MST, IsStandalone, SkipOpers, SkipDebugLoc, AddNewLine, TII);
}
void MachineInstr::print(raw_ostream &OS, ModuleSlotTracker &MST,
bool IsStandalone, bool SkipOpers, bool SkipDebugLoc,
bool AddNewLine, const TargetInstrInfo *TII) const {
// We can be a bit tidier if we know the MachineFunction.
const TargetRegisterInfo *TRI = nullptr;
const MachineRegisterInfo *MRI = nullptr;
const TargetIntrinsicInfo *IntrinsicInfo = nullptr;
tryToGetTargetInfo(*this, TRI, MRI, IntrinsicInfo, TII);
if (isCFIInstruction())
assert(getNumOperands() == 1 && "Expected 1 operand in CFI instruction");
SmallBitVector PrintedTypes(8);
bool ShouldPrintRegisterTies = IsStandalone || hasComplexRegisterTies();
auto getTiedOperandIdx = [&](unsigned OpIdx) {
if (!ShouldPrintRegisterTies)
return 0U;
const MachineOperand &MO = getOperand(OpIdx);
if (MO.isReg() && MO.isTied() && !MO.isDef())
return findTiedOperandIdx(OpIdx);
return 0U;
};
unsigned StartOp = 0;
unsigned e = getNumOperands();
// Print explicitly defined operands on the left of an assignment syntax.
while (StartOp < e) {
const MachineOperand &MO = getOperand(StartOp);
if (!MO.isReg() || !MO.isDef() || MO.isImplicit())
break;
if (StartOp != 0)
OS << ", ";
LLT TypeToPrint = MRI ? getTypeToPrint(StartOp, PrintedTypes, *MRI) : LLT{};
unsigned TiedOperandIdx = getTiedOperandIdx(StartOp);
MO.print(OS, MST, TypeToPrint, StartOp, /*PrintDef=*/false, IsStandalone,
ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo);
++StartOp;
}
if (StartOp != 0)
OS << " = ";
if (getFlag(MachineInstr::FrameSetup))
OS << "frame-setup ";
if (getFlag(MachineInstr::FrameDestroy))
OS << "frame-destroy ";
if (getFlag(MachineInstr::FmNoNans))
OS << "nnan ";
if (getFlag(MachineInstr::FmNoInfs))
OS << "ninf ";
if (getFlag(MachineInstr::FmNsz))
OS << "nsz ";
if (getFlag(MachineInstr::FmArcp))
OS << "arcp ";
if (getFlag(MachineInstr::FmContract))
OS << "contract ";
if (getFlag(MachineInstr::FmAfn))
OS << "afn ";
if (getFlag(MachineInstr::FmReassoc))
OS << "reassoc ";
if (getFlag(MachineInstr::NoUWrap))
OS << "nuw ";
if (getFlag(MachineInstr::NoSWrap))
OS << "nsw ";
if (getFlag(MachineInstr::IsExact))
OS << "exact ";
if (getFlag(MachineInstr::NoFPExcept))
OS << "nofpexcept ";
if (getFlag(MachineInstr::NoMerge))
OS << "nomerge ";
// Print the opcode name.
if (TII)
OS << TII->getName(getOpcode());
else
OS << "UNKNOWN";
if (SkipOpers)
return;
// Print the rest of the operands.
bool FirstOp = true;
unsigned AsmDescOp = ~0u;
unsigned AsmOpCount = 0;
if (isInlineAsm() && e >= InlineAsm::MIOp_FirstOperand) {
// Print asm string.
OS << " ";
const unsigned OpIdx = InlineAsm::MIOp_AsmString;
LLT TypeToPrint = MRI ? getTypeToPrint(OpIdx, PrintedTypes, *MRI) : LLT{};
unsigned TiedOperandIdx = getTiedOperandIdx(OpIdx);
getOperand(OpIdx).print(OS, MST, TypeToPrint, OpIdx, /*PrintDef=*/true, IsStandalone,
ShouldPrintRegisterTies, TiedOperandIdx, TRI,
IntrinsicInfo);
// Print HasSideEffects, MayLoad, MayStore, IsAlignStack
unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
OS << " [sideeffect]";
if (ExtraInfo & InlineAsm::Extra_MayLoad)
OS << " [mayload]";
if (ExtraInfo & InlineAsm::Extra_MayStore)
OS << " [maystore]";
if (ExtraInfo & InlineAsm::Extra_IsConvergent)
OS << " [isconvergent]";
if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
OS << " [alignstack]";
if (getInlineAsmDialect() == InlineAsm::AD_ATT)
OS << " [attdialect]";
if (getInlineAsmDialect() == InlineAsm::AD_Intel)
OS << " [inteldialect]";
StartOp = AsmDescOp = InlineAsm::MIOp_FirstOperand;
FirstOp = false;
}
for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
const MachineOperand &MO = getOperand(i);
if (FirstOp) FirstOp = false; else OS << ",";
OS << " ";
if (isDebugValue() && MO.isMetadata()) {
// Pretty print DBG_VALUE instructions.
auto *DIV = dyn_cast<DILocalVariable>(MO.getMetadata());
if (DIV && !DIV->getName().empty())
OS << "!\"" << DIV->getName() << '\"';
else {
LLT TypeToPrint = MRI ? getTypeToPrint(i, PrintedTypes, *MRI) : LLT{};
unsigned TiedOperandIdx = getTiedOperandIdx(i);
MO.print(OS, MST, TypeToPrint, i, /*PrintDef=*/true, IsStandalone,
ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo);
}
} else if (isDebugLabel() && MO.isMetadata()) {
// Pretty print DBG_LABEL instructions.
auto *DIL = dyn_cast<DILabel>(MO.getMetadata());
if (DIL && !DIL->getName().empty())
OS << "\"" << DIL->getName() << '\"';
else {
LLT TypeToPrint = MRI ? getTypeToPrint(i, PrintedTypes, *MRI) : LLT{};
unsigned TiedOperandIdx = getTiedOperandIdx(i);
MO.print(OS, MST, TypeToPrint, i, /*PrintDef=*/true, IsStandalone,
ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo);
}
} else if (i == AsmDescOp && MO.isImm()) {
// Pretty print the inline asm operand descriptor.
OS << '$' << AsmOpCount++;
unsigned Flag = MO.getImm();
OS << ":[";
OS << InlineAsm::getKindName(InlineAsm::getKind(Flag));
unsigned RCID = 0;
if (!InlineAsm::isImmKind(Flag) && !InlineAsm::isMemKind(Flag) &&
InlineAsm::hasRegClassConstraint(Flag, RCID)) {
if (TRI) {
OS << ':' << TRI->getRegClassName(TRI->getRegClass(RCID));
} else
OS << ":RC" << RCID;
}
if (InlineAsm::isMemKind(Flag)) {
unsigned MCID = InlineAsm::getMemoryConstraintID(Flag);
OS << ":" << InlineAsm::getMemConstraintName(MCID);
}
unsigned TiedTo = 0;
if (InlineAsm::isUseOperandTiedToDef(Flag, TiedTo))
OS << " tiedto:$" << TiedTo;
OS << ']';
// Compute the index of the next operand descriptor.
AsmDescOp += 1 + InlineAsm::getNumOperandRegisters(Flag);
} else {
LLT TypeToPrint = MRI ? getTypeToPrint(i, PrintedTypes, *MRI) : LLT{};
unsigned TiedOperandIdx = getTiedOperandIdx(i);
if (MO.isImm() && isOperandSubregIdx(i))
MachineOperand::printSubRegIdx(OS, MO.getImm(), TRI);
else
MO.print(OS, MST, TypeToPrint, i, /*PrintDef=*/true, IsStandalone,
ShouldPrintRegisterTies, TiedOperandIdx, TRI, IntrinsicInfo);
}
}
// Print any optional symbols attached to this instruction as-if they were
// operands.
if (MCSymbol *PreInstrSymbol = getPreInstrSymbol()) {
if (!FirstOp) {
FirstOp = false;
OS << ',';
}
OS << " pre-instr-symbol ";
MachineOperand::printSymbol(OS, *PreInstrSymbol);
}
if (MCSymbol *PostInstrSymbol = getPostInstrSymbol()) {
if (!FirstOp) {
FirstOp = false;
OS << ',';
}
OS << " post-instr-symbol ";
MachineOperand::printSymbol(OS, *PostInstrSymbol);
}
if (MDNode *HeapAllocMarker = getHeapAllocMarker()) {
if (!FirstOp) {
FirstOp = false;
OS << ',';
}
OS << " heap-alloc-marker ";
HeapAllocMarker->printAsOperand(OS, MST);
}
if (!SkipDebugLoc) {
if (const DebugLoc &DL = getDebugLoc()) {
if (!FirstOp)
OS << ',';
OS << " debug-location ";
DL->printAsOperand(OS, MST);
}
}
if (!memoperands_empty()) {
SmallVector<StringRef, 0> SSNs;
const LLVMContext *Context = nullptr;
std::unique_ptr<LLVMContext> CtxPtr;
const MachineFrameInfo *MFI = nullptr;
if (const MachineFunction *MF = getMFIfAvailable(*this)) {
MFI = &MF->getFrameInfo();
Context = &MF->getFunction().getContext();
} else {
CtxPtr = std::make_unique<LLVMContext>();
Context = CtxPtr.get();
}
OS << " :: ";
bool NeedComma = false;
for (const MachineMemOperand *Op : memoperands()) {
if (NeedComma)
OS << ", ";
Op->print(OS, MST, SSNs, *Context, MFI, TII);
NeedComma = true;
}
}
if (SkipDebugLoc)
return;
bool HaveSemi = false;
// Print debug location information.
if (const DebugLoc &DL = getDebugLoc()) {
if (!HaveSemi) {
OS << ';';
HaveSemi = true;
}
OS << ' ';
DL.print(OS);
}
// Print extra comments for DEBUG_VALUE.
if (isDebugValue() && getDebugVariableOp().isMetadata()) {
if (!HaveSemi) {
OS << ";";
HaveSemi = true;
}
auto *DV = getDebugVariable();
OS << " line no:" << DV->getLine();
if (isIndirectDebugValue())
OS << " indirect";
}
// TODO: DBG_LABEL
if (AddNewLine)
OS << '\n';
}
bool MachineInstr::addRegisterKilled(Register IncomingReg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
bool isPhysReg = Register::isPhysicalRegister(IncomingReg);
bool hasAliases = isPhysReg &&
MCRegAliasIterator(IncomingReg, RegInfo, false).isValid();
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;
// DEBUG_VALUE nodes do not contribute to code generation and should
// always be ignored. Failure to do so may result in trying to modify
// KILL flags on DEBUG_VALUE nodes.
if (MO.isDebug())
continue;
Register 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() && Register::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() &&
(!isInlineAsm() || findInlineAsmFlagIdx(OpIdx) < 0))
RemoveOperand(OpIdx);
else
getOperand(OpIdx).setIsKill(false);
DeadOps.pop_back();
}
// If not found, this means an alias of one of the operands is killed. Add a
// new implicit operand if required.
if (!Found && AddIfNotFound) {
addOperand(MachineOperand::CreateReg(IncomingReg,
false /*IsDef*/,
true /*IsImp*/,
true /*IsKill*/));
return true;
}
return Found;
}
void MachineInstr::clearRegisterKills(Register Reg,
const TargetRegisterInfo *RegInfo) {
if (!Register::isPhysicalRegister(Reg))
RegInfo = nullptr;
for (MachineOperand &MO : operands()) {
if (!MO.isReg() || !MO.isUse() || !MO.isKill())
continue;
Register OpReg = MO.getReg();
if ((RegInfo && RegInfo->regsOverlap(Reg, OpReg)) || Reg == OpReg)
MO.setIsKill(false);
}
}
bool MachineInstr::addRegisterDead(Register Reg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
bool isPhysReg = Register::isPhysicalRegister(Reg);
bool hasAliases = isPhysReg &&
MCRegAliasIterator(Reg, RegInfo, false).isValid();
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;
Register MOReg = MO.getReg();
if (!MOReg)
continue;
if (MOReg == Reg) {
MO.setIsDead();
Found = true;
} else if (hasAliases && MO.isDead() &&
Register::isPhysicalRegister(MOReg)) {
// There exists a super-register that's marked dead.
if (RegInfo->isSuperRegister(Reg, MOReg))
return true;
if (RegInfo->isSubRegister(Reg, MOReg))
DeadOps.push_back(i);
}
}
// Trim unneeded dead operands.
while (!DeadOps.empty()) {
unsigned OpIdx = DeadOps.back();
if (getOperand(OpIdx).isImplicit() &&
(!isInlineAsm() || findInlineAsmFlagIdx(OpIdx) < 0))
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(Reg,
true /*IsDef*/,
true /*IsImp*/,
false /*IsKill*/,
true /*IsDead*/));
return true;
}
void MachineInstr::clearRegisterDeads(Register Reg) {
for (MachineOperand &MO : operands()) {
if (!MO.isReg() || !MO.isDef() || MO.getReg() != Reg)
continue;
MO.setIsDead(false);
}
}
void MachineInstr::setRegisterDefReadUndef(Register Reg, bool IsUndef) {
for (MachineOperand &MO : operands()) {
if (!MO.isReg() || !MO.isDef() || MO.getReg() != Reg || MO.getSubReg() == 0)
continue;
MO.setIsUndef(IsUndef);
}
}
void MachineInstr::addRegisterDefined(Register Reg,
const TargetRegisterInfo *RegInfo) {
if (Register::isPhysicalRegister(Reg)) {
MachineOperand *MO = findRegisterDefOperand(Reg, false, false, RegInfo);
if (MO)
return;
} else {
for (const MachineOperand &MO : operands()) {
if (MO.isReg() && MO.getReg() == Reg && MO.isDef() &&
MO.getSubReg() == 0)
return;
}
}
addOperand(MachineOperand::CreateReg(Reg,
true /*IsDef*/,
true /*IsImp*/));
}
void MachineInstr::setPhysRegsDeadExcept(ArrayRef<Register> UsedRegs,
const TargetRegisterInfo &TRI) {
bool HasRegMask = false;
for (MachineOperand &MO : operands()) {
if (MO.isRegMask()) {
HasRegMask = true;
continue;
}
if (!MO.isReg() || !MO.isDef()) continue;
Register Reg = MO.getReg();
if (!Reg.isPhysical())
continue;
// If there are no uses, including partial uses, the def is dead.
if (llvm::none_of(UsedRegs,
[&](MCRegister Use) { return TRI.regsOverlap(Use, Reg); }))
MO.setIsDead();
}
// This is a call with a register mask operand.
// Mask clobbers are always dead, so add defs for the non-dead defines.
if (HasRegMask)
for (ArrayRef<Register>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
I != E; ++I)
addRegisterDefined(*I, &TRI);
}
unsigned
MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) {
// Build up a buffer of hash code components.
SmallVector<size_t, 16> HashComponents;
HashComponents.reserve(MI->getNumOperands() + 1);
HashComponents.push_back(MI->getOpcode());
for (const MachineOperand &MO : MI->operands()) {
if (MO.isReg() && MO.isDef() && Register::isVirtualRegister(MO.getReg()))
continue; // Skip virtual register defs.
HashComponents.push_back(hash_value(MO));
}
return hash_combine_range(HashComponents.begin(), HashComponents.end());
}
void MachineInstr::emitError(StringRef Msg) const {
// Find the source location cookie.
unsigned LocCookie = 0;
const MDNode *LocMD = nullptr;
for (unsigned i = getNumOperands(); i != 0; --i) {
if (getOperand(i-1).isMetadata() &&
(LocMD = getOperand(i-1).getMetadata()) &&
LocMD->getNumOperands() != 0) {
if (const ConstantInt *CI =
mdconst::dyn_extract<ConstantInt>(LocMD->getOperand(0))) {
LocCookie = CI->getZExtValue();
break;
}
}
}
if (const MachineBasicBlock *MBB = getParent())
if (const MachineFunction *MF = MBB->getParent())
return MF->getMMI().getModule()->getContext().emitError(LocCookie, Msg);
report_fatal_error(Msg);
}
MachineInstrBuilder llvm::BuildMI(MachineFunction &MF, const DebugLoc &DL,
const MCInstrDesc &MCID, bool IsIndirect,
Register Reg, const MDNode *Variable,
const MDNode *Expr) {
assert(isa<DILocalVariable>(Variable) && "not a variable");
assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
"Expected inlined-at fields to agree");
auto MIB = BuildMI(MF, DL, MCID).addReg(Reg, RegState::Debug);
if (IsIndirect)
MIB.addImm(0U);
else
MIB.addReg(0U, RegState::Debug);
return MIB.addMetadata(Variable).addMetadata(Expr);
}
MachineInstrBuilder llvm::BuildMI(MachineFunction &MF, const DebugLoc &DL,
const MCInstrDesc &MCID, bool IsIndirect,
MachineOperand &MO, const MDNode *Variable,
const MDNode *Expr) {
assert(isa<DILocalVariable>(Variable) && "not a variable");
assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
"Expected inlined-at fields to agree");
if (MO.isReg())
return BuildMI(MF, DL, MCID, IsIndirect, MO.getReg(), Variable, Expr);
auto MIB = BuildMI(MF, DL, MCID).add(MO);
if (IsIndirect)
MIB.addImm(0U);
else
MIB.addReg(0U, RegState::Debug);
return MIB.addMetadata(Variable).addMetadata(Expr);
}
MachineInstrBuilder llvm::BuildMI(MachineBasicBlock &BB,
MachineBasicBlock::iterator I,
const DebugLoc &DL, const MCInstrDesc &MCID,
bool IsIndirect, Register Reg,
const MDNode *Variable, const MDNode *Expr) {
MachineFunction &MF = *BB.getParent();
MachineInstr *MI = BuildMI(MF, DL, MCID, IsIndirect, Reg, Variable, Expr);
BB.insert(I, MI);
return MachineInstrBuilder(MF, MI);
}
MachineInstrBuilder llvm::BuildMI(MachineBasicBlock &BB,
MachineBasicBlock::iterator I,
const DebugLoc &DL, const MCInstrDesc &MCID,
bool IsIndirect, MachineOperand &MO,
const MDNode *Variable, const MDNode *Expr) {
MachineFunction &MF = *BB.getParent();
MachineInstr *MI = BuildMI(MF, DL, MCID, IsIndirect, MO, Variable, Expr);
BB.insert(I, MI);
return MachineInstrBuilder(MF, *MI);
}
/// Compute the new DIExpression to use with a DBG_VALUE for a spill slot.
/// This prepends DW_OP_deref when spilling an indirect DBG_VALUE.
static const DIExpression *computeExprForSpill(const MachineInstr &MI) {
assert(MI.getOperand(0).isReg() && "can't spill non-register");
assert(MI.getDebugVariable()->isValidLocationForIntrinsic(MI.getDebugLoc()) &&
"Expected inlined-at fields to agree");
const DIExpression *Expr = MI.getDebugExpression();
if (MI.isIndirectDebugValue()) {
assert(MI.getDebugOffset().getImm() == 0 &&
"DBG_VALUE with nonzero offset");
Expr = DIExpression::prepend(Expr, DIExpression::DerefBefore);
}
return Expr;
}
MachineInstr *llvm::buildDbgValueForSpill(MachineBasicBlock &BB,
MachineBasicBlock::iterator I,
const MachineInstr &Orig,
int FrameIndex) {
const DIExpression *Expr = computeExprForSpill(Orig);
return BuildMI(BB, I, Orig.getDebugLoc(), Orig.getDesc())
.addFrameIndex(FrameIndex)
.addImm(0U)
.addMetadata(Orig.getDebugVariable())
.addMetadata(Expr);
}
void llvm::updateDbgValueForSpill(MachineInstr &Orig, int FrameIndex) {
const DIExpression *Expr = computeExprForSpill(Orig);
Orig.getDebugOperand(0).ChangeToFrameIndex(FrameIndex);
Orig.getDebugOffset().ChangeToImmediate(0U);
Orig.getDebugExpressionOp().setMetadata(Expr);
}
void MachineInstr::collectDebugValues(
SmallVectorImpl<MachineInstr *> &DbgValues) {
MachineInstr &MI = *this;
if (!MI.getOperand(0).isReg())
return;
MachineBasicBlock::iterator DI = MI; ++DI;
for (MachineBasicBlock::iterator DE = MI.getParent()->end();
DI != DE; ++DI) {
if (!DI->isDebugValue())
return;
if (DI->getDebugOperandForReg(MI.getOperand(0).getReg()))
DbgValues.push_back(&*DI);
}
}
void MachineInstr::changeDebugValuesDefReg(Register Reg) {
// Collect matching debug values.
SmallVector<MachineInstr *, 2> DbgValues;
if (!getOperand(0).isReg())
return;
Register DefReg = getOperand(0).getReg();
auto *MRI = getRegInfo();
for (auto &MO : MRI->use_operands(DefReg)) {
auto *DI = MO.getParent();
if (!DI->isDebugValue())
continue;
if (DI->getDebugOperandForReg(DefReg)) {
DbgValues.push_back(DI);
}
}
// Propagate Reg to debug value instructions.
for (auto *DBI : DbgValues)
DBI->getDebugOperandForReg(DefReg)->setReg(Reg);
}
using MMOList = SmallVector<const MachineMemOperand *, 2>;
static unsigned getSpillSlotSize(const MMOList &Accesses,
const MachineFrameInfo &MFI) {
unsigned Size = 0;
for (auto A : Accesses)
if (MFI.isSpillSlotObjectIndex(
cast<FixedStackPseudoSourceValue>(A->getPseudoValue())
->getFrameIndex()))
Size += A->getSize();
return Size;
}
Optional<unsigned>
MachineInstr::getSpillSize(const TargetInstrInfo *TII) const {
int FI;
if (TII->isStoreToStackSlotPostFE(*this, FI)) {
const MachineFrameInfo &MFI = getMF()->getFrameInfo();
if (MFI.isSpillSlotObjectIndex(FI))
return (*memoperands_begin())->getSize();
}
return None;
}
Optional<unsigned>
MachineInstr::getFoldedSpillSize(const TargetInstrInfo *TII) const {
MMOList Accesses;
if (TII->hasStoreToStackSlot(*this, Accesses))
return getSpillSlotSize(Accesses, getMF()->getFrameInfo());
return None;
}
Optional<unsigned>
MachineInstr::getRestoreSize(const TargetInstrInfo *TII) const {
int FI;
if (TII->isLoadFromStackSlotPostFE(*this, FI)) {
const MachineFrameInfo &MFI = getMF()->getFrameInfo();
if (MFI.isSpillSlotObjectIndex(FI))
return (*memoperands_begin())->getSize();
}
return None;
}
Optional<unsigned>
MachineInstr::getFoldedRestoreSize(const TargetInstrInfo *TII) const {
MMOList Accesses;
if (TII->hasLoadFromStackSlot(*this, Accesses))
return getSpillSlotSize(Accesses, getMF()->getFrameInfo());
return None;
}
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