mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-12 05:56:25 +00:00
This introduces a new pass, SlotIndexes, which is responsible for numbering instructions for register allocation (and other clients). SlotIndexes numbering is designed to match the existing scheme, so this patch should not cause any changes in the generated code. For consistency, and to avoid naming confusion, LiveIndex has been renamed SlotIndex. The processImplicitDefs method of the LiveIntervals analysis has been moved into its own pass so that it can be run prior to SlotIndexes. This was necessary to match the existing numbering scheme. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85979 91177308-0d34-0410-b5e6-96231b3b80d8
776 lines
25 KiB
C++
776 lines
25 KiB
C++
//===- llvm/CodeGen/SlotIndexes.h - Slot indexes representation -*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements SlotIndex and related classes. The purpuse of SlotIndex
|
|
// is to describe a position at which a register can become live, or cease to
|
|
// be live.
|
|
//
|
|
// SlotIndex is mostly a proxy for entries of the SlotIndexList, a class which
|
|
// is held is LiveIntervals and provides the real numbering. This allows
|
|
// LiveIntervals to perform largely transparent renumbering. The SlotIndex
|
|
// class does hold a PHI bit, which determines whether the index relates to a
|
|
// PHI use or def point, or an actual instruction. See the SlotIndex class
|
|
// description for futher information.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_SLOTINDEXES_H
|
|
#define LLVM_CODEGEN_SLOTINDEXES_H
|
|
|
|
#include "llvm/ADT/PointerIntPair.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/CodeGen/MachineBasicBlock.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/Support/Allocator.h"
|
|
|
|
namespace llvm {
|
|
|
|
/// This class represents an entry in the slot index list held in the
|
|
/// SlotIndexes pass. It should not be used directly. See the
|
|
/// SlotIndex & SlotIndexes classes for the public interface to this
|
|
/// information.
|
|
class IndexListEntry {
|
|
friend class SlotIndex;
|
|
friend class SlotIndexes;
|
|
|
|
private:
|
|
|
|
IndexListEntry *next, *prev;
|
|
MachineInstr *mi;
|
|
unsigned index;
|
|
|
|
public:
|
|
|
|
IndexListEntry(MachineInstr *mi, unsigned index)
|
|
: mi(mi), index(index) {}
|
|
|
|
MachineInstr* getInstr() const { return mi; }
|
|
void setInstr(MachineInstr *mi) { this->mi = mi; }
|
|
|
|
unsigned getIndex() const { return index; }
|
|
void setIndex(unsigned index) { this->index = index; }
|
|
|
|
IndexListEntry* getNext() { return next; }
|
|
const IndexListEntry* getNext() const { return next; }
|
|
void setNext(IndexListEntry *next) { this->next = next; }
|
|
|
|
IndexListEntry* getPrev() { return prev; }
|
|
const IndexListEntry* getPrev() const { return prev; }
|
|
void setPrev(IndexListEntry *prev) { this->prev = prev; }
|
|
|
|
/*
|
|
bool operator==(const IndexListEntry &other) const {
|
|
assert(getIndex() != other.getIndex() || this == &other &&
|
|
"Non-equal index list entries compare equal.");
|
|
return getIndex() == other.getIndex();
|
|
}
|
|
|
|
bool operator!=(const IndexListEntry &other) const {
|
|
return getIndex() != other.getIndex();
|
|
}
|
|
|
|
bool operator<(const IndexListEntry &other) const {
|
|
return getIndex() < other.getIndex();
|
|
}
|
|
|
|
bool operator<=(const IndexListEntry &other) const {
|
|
return getIndex() <= other.getIndex();
|
|
}
|
|
|
|
bool operator>(const IndexListEntry &other) const {
|
|
return getIndex() > other.getIndex();
|
|
}
|
|
|
|
bool operator>=(const IndexListEntry &other) const {
|
|
return getIndex() >= other.getIndex();
|
|
}
|
|
|
|
int distance(const IndexListEntry &other) const {
|
|
return other.getIndex() - getIndex();
|
|
}
|
|
*/
|
|
};
|
|
|
|
// Specialize PointerLikeTypeTraits for IndexListEntry.
|
|
template <>
|
|
class PointerLikeTypeTraits<IndexListEntry*> {
|
|
public:
|
|
static inline void* getAsVoidPointer(IndexListEntry *p) {
|
|
return p;
|
|
}
|
|
static inline IndexListEntry* getFromVoidPointer(void *p) {
|
|
return static_cast<IndexListEntry*>(p);
|
|
}
|
|
enum { NumLowBitsAvailable = 3 };
|
|
};
|
|
|
|
/// SlotIndex - An opaque wrapper around machine indexes.
|
|
class SlotIndex {
|
|
friend class SlotIndexes;
|
|
friend class DenseMapInfo<SlotIndex>;
|
|
|
|
private:
|
|
|
|
// FIXME: Is there any way to statically allocate these things and have
|
|
// them 8-byte aligned?
|
|
static std::auto_ptr<IndexListEntry> emptyKeyPtr, tombstoneKeyPtr;
|
|
static const unsigned PHI_BIT = 1 << 2;
|
|
|
|
PointerIntPair<IndexListEntry*, 3, unsigned> lie;
|
|
|
|
SlotIndex(IndexListEntry *entry, unsigned phiAndSlot)
|
|
: lie(entry, phiAndSlot) {
|
|
assert(entry != 0 && "Attempt to construct index with 0 pointer.");
|
|
}
|
|
|
|
IndexListEntry& entry() const {
|
|
assert(lie.getPointer() != 0 && "Use of invalid index.");
|
|
return *lie.getPointer();
|
|
}
|
|
|
|
int getIndex() const {
|
|
return entry().getIndex() | getSlot();
|
|
}
|
|
|
|
static inline unsigned getHashValue(const SlotIndex &v) {
|
|
IndexListEntry *ptrVal = &v.entry();
|
|
return (unsigned((intptr_t)ptrVal) >> 4) ^
|
|
(unsigned((intptr_t)ptrVal) >> 9);
|
|
}
|
|
|
|
public:
|
|
|
|
// FIXME: Ugh. This is public because LiveIntervalAnalysis is still using it
|
|
// for some spill weight stuff. Fix that, then make this private.
|
|
enum Slot { LOAD, USE, DEF, STORE, NUM };
|
|
|
|
static inline SlotIndex getEmptyKey() {
|
|
// FIXME: How do we guarantee these numbers don't get allocated to
|
|
// legit indexes?
|
|
if (emptyKeyPtr.get() == 0)
|
|
emptyKeyPtr.reset(new IndexListEntry(0, ~0U & ~3U));
|
|
|
|
return SlotIndex(emptyKeyPtr.get(), 0);
|
|
}
|
|
|
|
static inline SlotIndex getTombstoneKey() {
|
|
// FIXME: How do we guarantee these numbers don't get allocated to
|
|
// legit indexes?
|
|
if (tombstoneKeyPtr.get() == 0)
|
|
tombstoneKeyPtr.reset(new IndexListEntry(0, ~0U & ~7U));
|
|
|
|
return SlotIndex(tombstoneKeyPtr.get(), 0);
|
|
}
|
|
|
|
/// Construct an invalid index.
|
|
SlotIndex() : lie(&getEmptyKey().entry(), 0) {}
|
|
|
|
// Construct a new slot index from the given one, set the phi flag on the
|
|
// new index to the value of the phi parameter.
|
|
SlotIndex(const SlotIndex &li, bool phi)
|
|
: lie(&li.entry(), phi ? PHI_BIT & li.getSlot() : (unsigned)li.getSlot()){
|
|
assert(lie.getPointer() != 0 &&
|
|
"Attempt to construct index with 0 pointer.");
|
|
}
|
|
|
|
// Construct a new slot index from the given one, set the phi flag on the
|
|
// new index to the value of the phi parameter, and the slot to the new slot.
|
|
SlotIndex(const SlotIndex &li, bool phi, Slot s)
|
|
: lie(&li.entry(), phi ? PHI_BIT & s : (unsigned)s) {
|
|
assert(lie.getPointer() != 0 &&
|
|
"Attempt to construct index with 0 pointer.");
|
|
}
|
|
|
|
/// Returns true if this is a valid index. Invalid indicies do
|
|
/// not point into an index table, and cannot be compared.
|
|
bool isValid() const {
|
|
return (lie.getPointer() != 0) && (lie.getPointer()->getIndex() != 0);
|
|
}
|
|
|
|
/// Print this index to the given raw_ostream.
|
|
void print(raw_ostream &os) const;
|
|
|
|
/// Dump this index to stderr.
|
|
void dump() const;
|
|
|
|
/// Compare two SlotIndex objects for equality.
|
|
bool operator==(SlotIndex other) const {
|
|
return getIndex() == other.getIndex();
|
|
}
|
|
/// Compare two SlotIndex objects for inequality.
|
|
bool operator!=(SlotIndex other) const {
|
|
return getIndex() != other.getIndex();
|
|
}
|
|
|
|
/// Compare two SlotIndex objects. Return true if the first index
|
|
/// is strictly lower than the second.
|
|
bool operator<(SlotIndex other) const {
|
|
return getIndex() < other.getIndex();
|
|
}
|
|
/// Compare two SlotIndex objects. Return true if the first index
|
|
/// is lower than, or equal to, the second.
|
|
bool operator<=(SlotIndex other) const {
|
|
return getIndex() <= other.getIndex();
|
|
}
|
|
|
|
/// Compare two SlotIndex objects. Return true if the first index
|
|
/// is greater than the second.
|
|
bool operator>(SlotIndex other) const {
|
|
return getIndex() > other.getIndex();
|
|
}
|
|
|
|
/// Compare two SlotIndex objects. Return true if the first index
|
|
/// is greater than, or equal to, the second.
|
|
bool operator>=(SlotIndex other) const {
|
|
return getIndex() >= other.getIndex();
|
|
}
|
|
|
|
/// Return the distance from this index to the given one.
|
|
int distance(SlotIndex other) const {
|
|
return other.getIndex() - getIndex();
|
|
}
|
|
|
|
/// Returns the slot for this SlotIndex.
|
|
Slot getSlot() const {
|
|
return static_cast<Slot>(lie.getInt() & ~PHI_BIT);
|
|
}
|
|
|
|
/// Returns the state of the PHI bit.
|
|
bool isPHI() const {
|
|
return lie.getInt() & PHI_BIT;
|
|
}
|
|
|
|
/// Returns the base index for associated with this index. The base index
|
|
/// is the one associated with the LOAD slot for the instruction pointed to
|
|
/// by this index.
|
|
SlotIndex getBaseIndex() const {
|
|
return getLoadIndex();
|
|
}
|
|
|
|
/// Returns the boundary index for associated with this index. The boundary
|
|
/// index is the one associated with the LOAD slot for the instruction
|
|
/// pointed to by this index.
|
|
SlotIndex getBoundaryIndex() const {
|
|
return getStoreIndex();
|
|
}
|
|
|
|
/// Returns the index of the LOAD slot for the instruction pointed to by
|
|
/// this index.
|
|
SlotIndex getLoadIndex() const {
|
|
return SlotIndex(&entry(), SlotIndex::LOAD);
|
|
}
|
|
|
|
/// Returns the index of the USE slot for the instruction pointed to by
|
|
/// this index.
|
|
SlotIndex getUseIndex() const {
|
|
return SlotIndex(&entry(), SlotIndex::USE);
|
|
}
|
|
|
|
/// Returns the index of the DEF slot for the instruction pointed to by
|
|
/// this index.
|
|
SlotIndex getDefIndex() const {
|
|
return SlotIndex(&entry(), SlotIndex::DEF);
|
|
}
|
|
|
|
/// Returns the index of the STORE slot for the instruction pointed to by
|
|
/// this index.
|
|
SlotIndex getStoreIndex() const {
|
|
return SlotIndex(&entry(), SlotIndex::STORE);
|
|
}
|
|
|
|
/// Returns the next slot in the index list. This could be either the
|
|
/// next slot for the instruction pointed to by this index or, if this
|
|
/// index is a STORE, the first slot for the next instruction.
|
|
/// WARNING: This method is considerably more expensive than the methods
|
|
/// that return specific slots (getUseIndex(), etc). If you can - please
|
|
/// use one of those methods.
|
|
SlotIndex getNextSlot() const {
|
|
Slot s = getSlot();
|
|
if (s == SlotIndex::STORE) {
|
|
return SlotIndex(entry().getNext(), SlotIndex::LOAD);
|
|
}
|
|
return SlotIndex(&entry(), s + 1);
|
|
}
|
|
|
|
/// Returns the next index. This is the index corresponding to the this
|
|
/// index's slot, but for the next instruction.
|
|
SlotIndex getNextIndex() const {
|
|
return SlotIndex(entry().getNext(), getSlot());
|
|
}
|
|
|
|
/// Returns the previous slot in the index list. This could be either the
|
|
/// previous slot for the instruction pointed to by this index or, if this
|
|
/// index is a LOAD, the last slot for the previous instruction.
|
|
/// WARNING: This method is considerably more expensive than the methods
|
|
/// that return specific slots (getUseIndex(), etc). If you can - please
|
|
/// use one of those methods.
|
|
SlotIndex getPrevSlot() const {
|
|
Slot s = getSlot();
|
|
if (s == SlotIndex::LOAD) {
|
|
return SlotIndex(entry().getPrev(), SlotIndex::STORE);
|
|
}
|
|
return SlotIndex(&entry(), s - 1);
|
|
}
|
|
|
|
/// Returns the previous index. This is the index corresponding to this
|
|
/// index's slot, but for the previous instruction.
|
|
SlotIndex getPrevIndex() const {
|
|
return SlotIndex(entry().getPrev(), getSlot());
|
|
}
|
|
|
|
};
|
|
|
|
/// DenseMapInfo specialization for SlotIndex.
|
|
template <>
|
|
struct DenseMapInfo<SlotIndex> {
|
|
static inline SlotIndex getEmptyKey() {
|
|
return SlotIndex::getEmptyKey();
|
|
}
|
|
static inline SlotIndex getTombstoneKey() {
|
|
return SlotIndex::getTombstoneKey();
|
|
}
|
|
static inline unsigned getHashValue(const SlotIndex &v) {
|
|
return SlotIndex::getHashValue(v);
|
|
}
|
|
static inline bool isEqual(const SlotIndex &LHS, const SlotIndex &RHS) {
|
|
return (LHS == RHS);
|
|
}
|
|
static inline bool isPod() { return false; }
|
|
};
|
|
|
|
inline raw_ostream& operator<<(raw_ostream &os, SlotIndex li) {
|
|
li.print(os);
|
|
return os;
|
|
}
|
|
|
|
typedef std::pair<SlotIndex, MachineBasicBlock*> IdxMBBPair;
|
|
|
|
inline bool operator<(SlotIndex V, const IdxMBBPair &IM) {
|
|
return V < IM.first;
|
|
}
|
|
|
|
inline bool operator<(const IdxMBBPair &IM, SlotIndex V) {
|
|
return IM.first < V;
|
|
}
|
|
|
|
struct Idx2MBBCompare {
|
|
bool operator()(const IdxMBBPair &LHS, const IdxMBBPair &RHS) const {
|
|
return LHS.first < RHS.first;
|
|
}
|
|
};
|
|
|
|
/// SlotIndexes pass.
|
|
///
|
|
/// This pass assigns indexes to each instruction.
|
|
class SlotIndexes : public MachineFunctionPass {
|
|
private:
|
|
|
|
MachineFunction *mf;
|
|
IndexListEntry *indexListHead;
|
|
unsigned functionSize;
|
|
|
|
typedef DenseMap<const MachineInstr*, SlotIndex> Mi2IndexMap;
|
|
Mi2IndexMap mi2iMap;
|
|
|
|
/// MBB2IdxMap - The indexes of the first and last instructions in the
|
|
/// specified basic block.
|
|
typedef DenseMap<const MachineBasicBlock*,
|
|
std::pair<SlotIndex, SlotIndex> > MBB2IdxMap;
|
|
MBB2IdxMap mbb2IdxMap;
|
|
|
|
/// Idx2MBBMap - Sorted list of pairs of index of first instruction
|
|
/// and MBB id.
|
|
std::vector<IdxMBBPair> idx2MBBMap;
|
|
|
|
typedef DenseMap<const MachineBasicBlock*, SlotIndex> TerminatorGapsMap;
|
|
TerminatorGapsMap terminatorGaps;
|
|
|
|
// IndexListEntry allocator.
|
|
BumpPtrAllocator ileAllocator;
|
|
|
|
IndexListEntry* createEntry(MachineInstr *mi, unsigned index) {
|
|
IndexListEntry *entry =
|
|
static_cast<IndexListEntry*>(
|
|
ileAllocator.Allocate(sizeof(IndexListEntry),
|
|
alignof<IndexListEntry>()));
|
|
|
|
new (entry) IndexListEntry(mi, index);
|
|
|
|
return entry;
|
|
}
|
|
|
|
void initList() {
|
|
assert(indexListHead == 0 && "Zero entry non-null at initialisation.");
|
|
indexListHead = createEntry(0, ~0U);
|
|
indexListHead->setNext(0);
|
|
indexListHead->setPrev(indexListHead);
|
|
}
|
|
|
|
void clearList() {
|
|
indexListHead = 0;
|
|
ileAllocator.Reset();
|
|
}
|
|
|
|
IndexListEntry* getTail() {
|
|
assert(indexListHead != 0 && "Call to getTail on uninitialized list.");
|
|
return indexListHead->getPrev();
|
|
}
|
|
|
|
const IndexListEntry* getTail() const {
|
|
assert(indexListHead != 0 && "Call to getTail on uninitialized list.");
|
|
return indexListHead->getPrev();
|
|
}
|
|
|
|
// Returns true if the index list is empty.
|
|
bool empty() const { return (indexListHead == getTail()); }
|
|
|
|
IndexListEntry* front() {
|
|
assert(!empty() && "front() called on empty index list.");
|
|
return indexListHead;
|
|
}
|
|
|
|
const IndexListEntry* front() const {
|
|
assert(!empty() && "front() called on empty index list.");
|
|
return indexListHead;
|
|
}
|
|
|
|
IndexListEntry* back() {
|
|
assert(!empty() && "back() called on empty index list.");
|
|
return getTail()->getPrev();
|
|
}
|
|
|
|
const IndexListEntry* back() const {
|
|
assert(!empty() && "back() called on empty index list.");
|
|
return getTail()->getPrev();
|
|
}
|
|
|
|
/// Insert a new entry before itr.
|
|
void insert(IndexListEntry *itr, IndexListEntry *val) {
|
|
assert(itr != 0 && "itr should not be null.");
|
|
IndexListEntry *prev = itr->getPrev();
|
|
val->setNext(itr);
|
|
val->setPrev(prev);
|
|
|
|
if (itr != indexListHead) {
|
|
prev->setNext(val);
|
|
}
|
|
else {
|
|
indexListHead = val;
|
|
}
|
|
itr->setPrev(val);
|
|
}
|
|
|
|
/// Push a new entry on to the end of the list.
|
|
void push_back(IndexListEntry *val) {
|
|
insert(getTail(), val);
|
|
}
|
|
|
|
public:
|
|
static char ID;
|
|
|
|
SlotIndexes() : MachineFunctionPass(&ID), indexListHead(0) {}
|
|
|
|
virtual void getAnalysisUsage(AnalysisUsage &au) const;
|
|
virtual void releaseMemory();
|
|
|
|
virtual bool runOnMachineFunction(MachineFunction &fn);
|
|
|
|
/// Dump the indexes.
|
|
void dump() const;
|
|
|
|
/// Renumber the index list, providing space for new instructions.
|
|
void renumber();
|
|
|
|
/// Returns the zero index for this analysis.
|
|
SlotIndex getZeroIndex() {
|
|
assert(front()->getIndex() == 0 && "First index is not 0?");
|
|
return SlotIndex(front(), 0);
|
|
}
|
|
|
|
/// Returns the invalid index marker for this analysis.
|
|
SlotIndex getInvalidIndex() {
|
|
return getZeroIndex();
|
|
}
|
|
|
|
/// Returns the distance between the highest and lowest indexes allocated
|
|
/// so far.
|
|
unsigned getIndexesLength() const {
|
|
assert(front()->getIndex() == 0 &&
|
|
"Initial index isn't zero?");
|
|
|
|
return back()->getIndex();
|
|
}
|
|
|
|
/// Returns the number of instructions in the function.
|
|
unsigned getFunctionSize() const {
|
|
return functionSize;
|
|
}
|
|
|
|
/// Returns true if the given machine instr is mapped to an index,
|
|
/// otherwise returns false.
|
|
bool hasIndex(const MachineInstr *instr) const {
|
|
return (mi2iMap.find(instr) != mi2iMap.end());
|
|
}
|
|
|
|
/// Returns the base index for the given instruction.
|
|
SlotIndex getInstructionIndex(const MachineInstr *instr) const {
|
|
Mi2IndexMap::const_iterator itr = mi2iMap.find(instr);
|
|
assert(itr != mi2iMap.end() && "Instruction not found in maps.");
|
|
return itr->second;
|
|
}
|
|
|
|
/// Returns the instruction for the given index, or null if the given
|
|
/// index has no instruction associated with it.
|
|
MachineInstr* getInstructionFromIndex(SlotIndex index) const {
|
|
return index.entry().getInstr();
|
|
}
|
|
|
|
/// Returns the next non-null index.
|
|
SlotIndex getNextNonNullIndex(SlotIndex index) {
|
|
SlotIndex nextNonNull = index.getNextIndex();
|
|
|
|
while (&nextNonNull.entry() != getTail() &&
|
|
getInstructionFromIndex(nextNonNull) == 0) {
|
|
nextNonNull = nextNonNull.getNextIndex();
|
|
}
|
|
|
|
return nextNonNull;
|
|
}
|
|
|
|
/// Returns the first index in the given basic block.
|
|
SlotIndex getMBBStartIdx(const MachineBasicBlock *mbb) const {
|
|
MBB2IdxMap::const_iterator itr = mbb2IdxMap.find(mbb);
|
|
assert(itr != mbb2IdxMap.end() && "MBB not found in maps.");
|
|
return itr->second.first;
|
|
}
|
|
|
|
/// Returns the last index in the given basic block.
|
|
SlotIndex getMBBEndIdx(const MachineBasicBlock *mbb) const {
|
|
MBB2IdxMap::const_iterator itr = mbb2IdxMap.find(mbb);
|
|
assert(itr != mbb2IdxMap.end() && "MBB not found in maps.");
|
|
return itr->second.second;
|
|
}
|
|
|
|
/// Returns the terminator gap for the given index.
|
|
SlotIndex getTerminatorGap(const MachineBasicBlock *mbb) {
|
|
TerminatorGapsMap::iterator itr = terminatorGaps.find(mbb);
|
|
assert(itr != terminatorGaps.end() &&
|
|
"All MBBs should have terminator gaps in their indexes.");
|
|
return itr->second;
|
|
}
|
|
|
|
/// Returns the basic block which the given index falls in.
|
|
MachineBasicBlock* getMBBFromIndex(SlotIndex index) const {
|
|
std::vector<IdxMBBPair>::const_iterator I =
|
|
std::lower_bound(idx2MBBMap.begin(), idx2MBBMap.end(), index);
|
|
// Take the pair containing the index
|
|
std::vector<IdxMBBPair>::const_iterator J =
|
|
((I != idx2MBBMap.end() && I->first > index) ||
|
|
(I == idx2MBBMap.end() && idx2MBBMap.size()>0)) ? (I-1): I;
|
|
|
|
assert(J != idx2MBBMap.end() && J->first <= index &&
|
|
index <= getMBBEndIdx(J->second) &&
|
|
"index does not correspond to an MBB");
|
|
return J->second;
|
|
}
|
|
|
|
bool findLiveInMBBs(SlotIndex start, SlotIndex end,
|
|
SmallVectorImpl<MachineBasicBlock*> &mbbs) const {
|
|
std::vector<IdxMBBPair>::const_iterator itr =
|
|
std::lower_bound(idx2MBBMap.begin(), idx2MBBMap.end(), start);
|
|
bool resVal = false;
|
|
|
|
while (itr != idx2MBBMap.end()) {
|
|
if (itr->first >= end)
|
|
break;
|
|
mbbs.push_back(itr->second);
|
|
resVal = true;
|
|
++itr;
|
|
}
|
|
return resVal;
|
|
}
|
|
|
|
/// Return a list of MBBs that can be reach via any branches or
|
|
/// fall-throughs.
|
|
bool findReachableMBBs(SlotIndex start, SlotIndex end,
|
|
SmallVectorImpl<MachineBasicBlock*> &mbbs) const {
|
|
std::vector<IdxMBBPair>::const_iterator itr =
|
|
std::lower_bound(idx2MBBMap.begin(), idx2MBBMap.end(), start);
|
|
|
|
bool resVal = false;
|
|
while (itr != idx2MBBMap.end()) {
|
|
if (itr->first > end)
|
|
break;
|
|
MachineBasicBlock *mbb = itr->second;
|
|
if (getMBBEndIdx(mbb) > end)
|
|
break;
|
|
for (MachineBasicBlock::succ_iterator si = mbb->succ_begin(),
|
|
se = mbb->succ_end(); si != se; ++si)
|
|
mbbs.push_back(*si);
|
|
resVal = true;
|
|
++itr;
|
|
}
|
|
return resVal;
|
|
}
|
|
|
|
/// Returns the MBB covering the given range, or null if the range covers
|
|
/// more than one basic block.
|
|
MachineBasicBlock* getMBBCoveringRange(SlotIndex start, SlotIndex end) const {
|
|
|
|
assert(start < end && "Backwards ranges not allowed.");
|
|
|
|
std::vector<IdxMBBPair>::const_iterator itr =
|
|
std::lower_bound(idx2MBBMap.begin(), idx2MBBMap.end(), start);
|
|
|
|
if (itr == idx2MBBMap.end()) {
|
|
itr = prior(itr);
|
|
return itr->second;
|
|
}
|
|
|
|
// Check that we don't cross the boundary into this block.
|
|
if (itr->first < end)
|
|
return 0;
|
|
|
|
itr = prior(itr);
|
|
|
|
if (itr->first <= start)
|
|
return itr->second;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// Returns true if there is a gap in the numbering before the given index.
|
|
bool hasGapBeforeInstr(SlotIndex index) {
|
|
index = index.getBaseIndex();
|
|
SlotIndex prevIndex = index.getPrevIndex();
|
|
|
|
if (prevIndex == getZeroIndex())
|
|
return false;
|
|
|
|
if (getInstructionFromIndex(prevIndex) == 0)
|
|
return true;
|
|
|
|
if (prevIndex.distance(index) >= 2 * SlotIndex::NUM)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/// Returns true if there is a gap in the numbering after the given index.
|
|
bool hasGapAfterInstr(SlotIndex index) const {
|
|
// Not implemented yet.
|
|
assert(false &&
|
|
"SlotIndexes::hasGapAfterInstr(SlotIndex) not implemented yet.");
|
|
return false;
|
|
}
|
|
|
|
/// findGapBeforeInstr - Find an empty instruction slot before the
|
|
/// specified index. If "Furthest" is true, find one that's furthest
|
|
/// away from the index (but before any index that's occupied).
|
|
// FIXME: This whole method should go away in future. It should
|
|
// always be possible to insert code between existing indices.
|
|
SlotIndex findGapBeforeInstr(SlotIndex index, bool furthest = false) {
|
|
if (index == getZeroIndex())
|
|
return getInvalidIndex();
|
|
|
|
index = index.getBaseIndex();
|
|
SlotIndex prevIndex = index.getPrevIndex();
|
|
|
|
if (prevIndex == getZeroIndex())
|
|
return getInvalidIndex();
|
|
|
|
// Try to reuse existing index objects with null-instrs.
|
|
if (getInstructionFromIndex(prevIndex) == 0) {
|
|
if (furthest) {
|
|
while (getInstructionFromIndex(prevIndex) == 0 &&
|
|
prevIndex != getZeroIndex()) {
|
|
prevIndex = prevIndex.getPrevIndex();
|
|
}
|
|
|
|
prevIndex = prevIndex.getNextIndex();
|
|
}
|
|
|
|
assert(getInstructionFromIndex(prevIndex) == 0 && "Index list is broken.");
|
|
|
|
return prevIndex;
|
|
}
|
|
|
|
int dist = prevIndex.distance(index);
|
|
|
|
// Double check that the spacing between this instruction and
|
|
// the last is sane.
|
|
assert(dist >= SlotIndex::NUM &&
|
|
"Distance between indexes too small.");
|
|
|
|
// If there's no gap return an invalid index.
|
|
if (dist < 2*SlotIndex::NUM) {
|
|
return getInvalidIndex();
|
|
}
|
|
|
|
// Otherwise insert new index entries into the list using the
|
|
// gap in the numbering.
|
|
IndexListEntry *newEntry =
|
|
createEntry(0, prevIndex.entry().getIndex() + SlotIndex::NUM);
|
|
|
|
insert(&index.entry(), newEntry);
|
|
|
|
// And return a pointer to the entry at the start of the gap.
|
|
return index.getPrevIndex();
|
|
}
|
|
|
|
/// Insert the given machine instruction into the mapping at the given
|
|
/// index.
|
|
void insertMachineInstrInMaps(MachineInstr *mi, SlotIndex index) {
|
|
index = index.getBaseIndex();
|
|
IndexListEntry *miEntry = &index.entry();
|
|
assert(miEntry->getInstr() == 0 && "Index already in use.");
|
|
miEntry->setInstr(mi);
|
|
|
|
assert(mi2iMap.find(mi) == mi2iMap.end() &&
|
|
"MachineInstr already has an index.");
|
|
|
|
mi2iMap.insert(std::make_pair(mi, index));
|
|
}
|
|
|
|
/// Remove the given machine instruction from the mapping.
|
|
void removeMachineInstrFromMaps(MachineInstr *mi) {
|
|
// remove index -> MachineInstr and
|
|
// MachineInstr -> index mappings
|
|
Mi2IndexMap::iterator mi2iItr = mi2iMap.find(mi);
|
|
if (mi2iItr != mi2iMap.end()) {
|
|
IndexListEntry *miEntry(&mi2iItr->second.entry());
|
|
assert(miEntry->getInstr() == mi && "Instruction indexes broken.");
|
|
// FIXME: Eventually we want to actually delete these indexes.
|
|
miEntry->setInstr(0);
|
|
mi2iMap.erase(mi2iItr);
|
|
}
|
|
}
|
|
|
|
/// ReplaceMachineInstrInMaps - Replacing a machine instr with a new one in
|
|
/// maps used by register allocator.
|
|
void replaceMachineInstrInMaps(MachineInstr *mi, MachineInstr *newMI) {
|
|
Mi2IndexMap::iterator mi2iItr = mi2iMap.find(mi);
|
|
if (mi2iItr == mi2iMap.end())
|
|
return;
|
|
SlotIndex replaceBaseIndex = mi2iItr->second;
|
|
IndexListEntry *miEntry(&replaceBaseIndex.entry());
|
|
assert(miEntry->getInstr() == mi &&
|
|
"Mismatched instruction in index tables.");
|
|
miEntry->setInstr(newMI);
|
|
mi2iMap.erase(mi2iItr);
|
|
mi2iMap.insert(std::make_pair(newMI, replaceBaseIndex));
|
|
}
|
|
|
|
};
|
|
|
|
|
|
}
|
|
|
|
#endif // LLVM_CODEGEN_LIVEINDEX_H
|