801 lines
27 KiB
C++
801 lines
27 KiB
C++
//===-- llvm/CodeGen/LiveInterval.h - Interval representation ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the LiveRange and LiveInterval classes. Given some
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// numbering of each the machine instructions an interval [i, j) is said to be a
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// live interval for register v if there is no instruction with number j' >= j
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// such that v is live at j' and there is no instruction with number i' < i such
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// that v is live at i'. In this implementation intervals can have holes,
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// i.e. an interval might look like [1,20), [50,65), [1000,1001). Each
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// individual range is represented as an instance of LiveRange, and the whole
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// interval is represented as an instance of LiveInterval.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_LIVEINTERVAL_H
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#define LLVM_CODEGEN_LIVEINTERVAL_H
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#include "llvm/ADT/DenseMapInfo.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/AlignOf.h"
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#include <cassert>
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#include <climits>
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namespace llvm {
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class MachineInstr;
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class MachineRegisterInfo;
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class TargetRegisterInfo;
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class raw_ostream;
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/// LiveIndex - An opaque wrapper around machine indexes.
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class LiveIndex {
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friend class VNInfo;
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friend class LiveInterval;
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friend class LiveIntervals;
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friend struct DenseMapInfo<LiveIndex>;
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public:
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enum Slot { LOAD, USE, DEF, STORE, NUM };
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private:
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unsigned index;
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static const unsigned PHI_BIT = 1 << 31;
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public:
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/// Construct a default LiveIndex pointing to a reserved index.
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LiveIndex() : index(0) {}
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/// Construct an index from the given index, pointing to the given slot.
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LiveIndex(LiveIndex m, Slot s)
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: index((m.index / NUM) * NUM + s) {}
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/// Print this index to the given raw_ostream.
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void print(raw_ostream &os) const;
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/// Compare two LiveIndex objects for equality.
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bool operator==(LiveIndex other) const {
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return ((index & ~PHI_BIT) == (other.index & ~PHI_BIT));
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}
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/// Compare two LiveIndex objects for inequality.
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bool operator!=(LiveIndex other) const {
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return ((index & ~PHI_BIT) != (other.index & ~PHI_BIT));
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}
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/// Compare two LiveIndex objects. Return true if the first index
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/// is strictly lower than the second.
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bool operator<(LiveIndex other) const {
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return ((index & ~PHI_BIT) < (other.index & ~PHI_BIT));
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}
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/// Compare two LiveIndex objects. Return true if the first index
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/// is lower than, or equal to, the second.
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bool operator<=(LiveIndex other) const {
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return ((index & ~PHI_BIT) <= (other.index & ~PHI_BIT));
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}
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/// Compare two LiveIndex objects. Return true if the first index
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/// is greater than the second.
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bool operator>(LiveIndex other) const {
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return ((index & ~PHI_BIT) > (other.index & ~PHI_BIT));
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}
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/// Compare two LiveIndex objects. Return true if the first index
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/// is greater than, or equal to, the second.
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bool operator>=(LiveIndex other) const {
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return ((index & ~PHI_BIT) >= (other.index & ~PHI_BIT));
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}
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/// Returns true if this index represents a load.
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bool isLoad() const {
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return ((index % NUM) == LOAD);
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}
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/// Returns true if this index represents a use.
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bool isUse() const {
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return ((index % NUM) == USE);
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}
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/// Returns true if this index represents a def.
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bool isDef() const {
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return ((index % NUM) == DEF);
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}
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/// Returns true if this index represents a store.
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bool isStore() const {
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return ((index % NUM) == STORE);
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}
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/// Returns the slot for this LiveIndex.
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Slot getSlot() const {
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return static_cast<Slot>(index % NUM);
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}
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/// Returns true if this index represents a non-PHI use/def.
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bool isNonPHIIndex() const {
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return ((index & PHI_BIT) == 0);
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}
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/// Returns true if this index represents a PHI use/def.
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bool isPHIIndex() const {
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return ((index & PHI_BIT) == PHI_BIT);
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}
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private:
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/// Construct an index from the given index, with its PHI kill marker set.
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LiveIndex(bool phi, LiveIndex o) : index(o.index) {
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if (phi)
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index |= PHI_BIT;
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else
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index &= ~PHI_BIT;
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}
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explicit LiveIndex(unsigned idx)
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: index(idx & ~PHI_BIT) {}
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LiveIndex(bool phi, unsigned idx)
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: index(idx & ~PHI_BIT) {
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if (phi)
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index |= PHI_BIT;
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}
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LiveIndex(bool phi, unsigned idx, Slot slot)
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: index(((idx / NUM) * NUM + slot) & ~PHI_BIT) {
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if (phi)
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index |= PHI_BIT;
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}
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LiveIndex nextSlot_() const {
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assert((index & PHI_BIT) == ((index + 1) & PHI_BIT) &&
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"Index out of bounds.");
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return LiveIndex(index + 1);
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}
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LiveIndex nextIndex_() const {
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assert((index & PHI_BIT) == ((index + NUM) & PHI_BIT) &&
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"Index out of bounds.");
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return LiveIndex(index + NUM);
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}
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LiveIndex prevSlot_() const {
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assert((index & PHI_BIT) == ((index - 1) & PHI_BIT) &&
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"Index out of bounds.");
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return LiveIndex(index - 1);
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}
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LiveIndex prevIndex_() const {
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assert((index & PHI_BIT) == ((index - NUM) & PHI_BIT) &&
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"Index out of bounds.");
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return LiveIndex(index - NUM);
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}
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int distance(LiveIndex other) const {
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return (other.index & ~PHI_BIT) - (index & ~PHI_BIT);
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}
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/// Returns an unsigned number suitable as an index into a
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/// vector over all instructions.
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unsigned getVecIndex() const {
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return (index & ~PHI_BIT) / NUM;
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}
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/// Scale this index by the given factor.
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LiveIndex scale(unsigned factor) const {
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unsigned i = (index & ~PHI_BIT) / NUM,
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o = (index % ~PHI_BIT) % NUM;
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assert(index <= (~0U & ~PHI_BIT) / (factor * NUM) &&
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"Rescaled interval would overflow");
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return LiveIndex(i * NUM * factor, o);
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}
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static LiveIndex emptyKey() {
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return LiveIndex(true, 0x7fffffff);
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}
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static LiveIndex tombstoneKey() {
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return LiveIndex(true, 0x7ffffffe);
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}
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static unsigned getHashValue(const LiveIndex &v) {
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return v.index * 37;
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}
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};
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inline raw_ostream& operator<<(raw_ostream &os, LiveIndex mi) {
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mi.print(os);
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return os;
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}
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/// Densemap specialization for LiveIndex.
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template <>
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struct DenseMapInfo<LiveIndex> {
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static inline LiveIndex getEmptyKey() {
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return LiveIndex::emptyKey();
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}
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static inline LiveIndex getTombstoneKey() {
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return LiveIndex::tombstoneKey();
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}
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static inline unsigned getHashValue(const LiveIndex &v) {
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return LiveIndex::getHashValue(v);
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}
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static inline bool isEqual(const LiveIndex &LHS,
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const LiveIndex &RHS) {
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return (LHS == RHS);
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}
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static inline bool isPod() { return true; }
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};
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/// VNInfo - Value Number Information.
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/// This class holds information about a machine level values, including
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/// definition and use points.
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///
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/// Care must be taken in interpreting the def index of the value. The
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/// following rules apply:
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///
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/// If the isDefAccurate() method returns false then def does not contain the
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/// index of the defining MachineInstr, or even (necessarily) to a
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/// MachineInstr at all. In general such a def index is not meaningful
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/// and should not be used. The exception is that, for values originally
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/// defined by PHI instructions, after PHI elimination def will contain the
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/// index of the MBB in which the PHI originally existed. This can be used
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/// to insert code (spills or copies) which deals with the value, which will
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/// be live in to the block.
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class VNInfo {
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private:
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enum {
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HAS_PHI_KILL = 1,
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REDEF_BY_EC = 1 << 1,
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IS_PHI_DEF = 1 << 2,
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IS_UNUSED = 1 << 3,
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IS_DEF_ACCURATE = 1 << 4
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};
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unsigned char flags;
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union {
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MachineInstr *copy;
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unsigned reg;
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} cr;
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public:
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typedef SmallVector<LiveIndex, 4> KillSet;
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/// The ID number of this value.
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unsigned id;
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/// The index of the defining instruction (if isDefAccurate() returns true).
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LiveIndex def;
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KillSet kills;
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VNInfo()
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: flags(IS_UNUSED), id(~1U) { cr.copy = 0; }
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/// VNInfo constructor.
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/// d is presumed to point to the actual defining instr. If it doesn't
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/// setIsDefAccurate(false) should be called after construction.
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VNInfo(unsigned i, LiveIndex d, MachineInstr *c)
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: flags(IS_DEF_ACCURATE), id(i), def(d) { cr.copy = c; }
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/// VNInfo construtor, copies values from orig, except for the value number.
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VNInfo(unsigned i, const VNInfo &orig)
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: flags(orig.flags), cr(orig.cr), id(i), def(orig.def), kills(orig.kills)
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{ }
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/// Copy from the parameter into this VNInfo.
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void copyFrom(VNInfo &src) {
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flags = src.flags;
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cr = src.cr;
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def = src.def;
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kills = src.kills;
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}
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/// Used for copying value number info.
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unsigned getFlags() const { return flags; }
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void setFlags(unsigned flags) { this->flags = flags; }
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/// For a register interval, if this VN was definied by a copy instr
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/// getCopy() returns a pointer to it, otherwise returns 0.
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/// For a stack interval the behaviour of this method is undefined.
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MachineInstr* getCopy() const { return cr.copy; }
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/// For a register interval, set the copy member.
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/// This method should not be called on stack intervals as it may lead to
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/// undefined behavior.
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void setCopy(MachineInstr *c) { cr.copy = c; }
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/// For a stack interval, returns the reg which this stack interval was
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/// defined from.
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/// For a register interval the behaviour of this method is undefined.
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unsigned getReg() const { return cr.reg; }
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/// For a stack interval, set the defining register.
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/// This method should not be called on register intervals as it may lead
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/// to undefined behaviour.
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void setReg(unsigned reg) { cr.reg = reg; }
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/// Returns true if one or more kills are PHI nodes.
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bool hasPHIKill() const { return flags & HAS_PHI_KILL; }
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/// Set the PHI kill flag on this value.
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void setHasPHIKill(bool hasKill) {
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if (hasKill)
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flags |= HAS_PHI_KILL;
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else
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flags &= ~HAS_PHI_KILL;
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}
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/// Returns true if this value is re-defined by an early clobber somewhere
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/// during the live range.
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bool hasRedefByEC() const { return flags & REDEF_BY_EC; }
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/// Set the "redef by early clobber" flag on this value.
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void setHasRedefByEC(bool hasRedef) {
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if (hasRedef)
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flags |= REDEF_BY_EC;
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else
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flags &= ~REDEF_BY_EC;
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}
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/// Returns true if this value is defined by a PHI instruction (or was,
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/// PHI instrucions may have been eliminated).
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bool isPHIDef() const { return flags & IS_PHI_DEF; }
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/// Set the "phi def" flag on this value.
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void setIsPHIDef(bool phiDef) {
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if (phiDef)
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flags |= IS_PHI_DEF;
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else
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flags &= ~IS_PHI_DEF;
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}
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/// Returns true if this value is unused.
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bool isUnused() const { return flags & IS_UNUSED; }
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/// Set the "is unused" flag on this value.
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void setIsUnused(bool unused) {
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if (unused)
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flags |= IS_UNUSED;
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else
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flags &= ~IS_UNUSED;
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}
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/// Returns true if the def is accurate.
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bool isDefAccurate() const { return flags & IS_DEF_ACCURATE; }
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/// Set the "is def accurate" flag on this value.
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void setIsDefAccurate(bool defAccurate) {
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if (defAccurate)
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flags |= IS_DEF_ACCURATE;
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else
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flags &= ~IS_DEF_ACCURATE;
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}
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/// Returns true if the given index is a kill of this value.
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bool isKill(LiveIndex k) const {
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KillSet::const_iterator
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i = std::lower_bound(kills.begin(), kills.end(), k);
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return (i != kills.end() && *i == k);
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}
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/// addKill - Add a kill instruction index to the specified value
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/// number.
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void addKill(LiveIndex k) {
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if (kills.empty()) {
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kills.push_back(k);
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} else {
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KillSet::iterator
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i = std::lower_bound(kills.begin(), kills.end(), k);
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kills.insert(i, k);
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}
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}
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/// Remove the specified kill index from this value's kills list.
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/// Returns true if the value was present, otherwise returns false.
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bool removeKill(LiveIndex k) {
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KillSet::iterator i = std::lower_bound(kills.begin(), kills.end(), k);
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if (i != kills.end() && *i == k) {
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kills.erase(i);
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return true;
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}
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return false;
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}
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/// Remove all kills in the range [s, e).
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void removeKills(LiveIndex s, LiveIndex e) {
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KillSet::iterator
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si = std::lower_bound(kills.begin(), kills.end(), s),
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se = std::upper_bound(kills.begin(), kills.end(), e);
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kills.erase(si, se);
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}
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};
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/// LiveRange structure - This represents a simple register range in the
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/// program, with an inclusive start point and an exclusive end point.
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/// These ranges are rendered as [start,end).
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struct LiveRange {
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LiveIndex start; // Start point of the interval (inclusive)
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LiveIndex end; // End point of the interval (exclusive)
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VNInfo *valno; // identifier for the value contained in this interval.
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LiveRange(LiveIndex S, LiveIndex E, VNInfo *V)
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: start(S), end(E), valno(V) {
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assert(S < E && "Cannot create empty or backwards range");
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}
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/// contains - Return true if the index is covered by this range.
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///
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bool contains(LiveIndex I) const {
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return start <= I && I < end;
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}
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/// containsRange - Return true if the given range, [S, E), is covered by
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/// this range.
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bool containsRange(LiveIndex S, LiveIndex E) const {
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assert((S < E) && "Backwards interval?");
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return (start <= S && S < end) && (start < E && E <= end);
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}
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bool operator<(const LiveRange &LR) const {
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return start < LR.start || (start == LR.start && end < LR.end);
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}
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bool operator==(const LiveRange &LR) const {
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return start == LR.start && end == LR.end;
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}
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void dump() const;
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void print(raw_ostream &os) const;
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private:
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LiveRange(); // DO NOT IMPLEMENT
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};
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raw_ostream& operator<<(raw_ostream& os, const LiveRange &LR);
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inline bool operator<(LiveIndex V, const LiveRange &LR) {
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return V < LR.start;
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}
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inline bool operator<(const LiveRange &LR, LiveIndex V) {
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return LR.start < V;
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}
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/// LiveInterval - This class represents some number of live ranges for a
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/// register or value. This class also contains a bit of register allocator
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/// state.
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class LiveInterval {
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public:
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typedef SmallVector<LiveRange,4> Ranges;
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typedef SmallVector<VNInfo*,4> VNInfoList;
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unsigned reg; // the register or stack slot of this interval
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// if the top bits is set, it represents a stack slot.
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float weight; // weight of this interval
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Ranges ranges; // the ranges in which this register is live
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VNInfoList valnos; // value#'s
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struct InstrSlots {
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enum {
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LOAD = 0,
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USE = 1,
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DEF = 2,
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STORE = 3,
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NUM = 4
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};
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};
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LiveInterval(unsigned Reg, float Weight, bool IsSS = false)
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: reg(Reg), weight(Weight) {
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if (IsSS)
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reg = reg | (1U << (sizeof(unsigned)*CHAR_BIT-1));
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}
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typedef Ranges::iterator iterator;
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iterator begin() { return ranges.begin(); }
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iterator end() { return ranges.end(); }
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typedef Ranges::const_iterator const_iterator;
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const_iterator begin() const { return ranges.begin(); }
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const_iterator end() const { return ranges.end(); }
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typedef VNInfoList::iterator vni_iterator;
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vni_iterator vni_begin() { return valnos.begin(); }
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vni_iterator vni_end() { return valnos.end(); }
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typedef VNInfoList::const_iterator const_vni_iterator;
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const_vni_iterator vni_begin() const { return valnos.begin(); }
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const_vni_iterator vni_end() const { return valnos.end(); }
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/// advanceTo - Advance the specified iterator to point to the LiveRange
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/// containing the specified position, or end() if the position is past the
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/// end of the interval. If no LiveRange contains this position, but the
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/// position is in a hole, this method returns an iterator pointing the the
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/// LiveRange immediately after the hole.
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iterator advanceTo(iterator I, LiveIndex Pos) {
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if (Pos >= endIndex())
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return end();
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while (I->end <= Pos) ++I;
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return I;
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}
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void clear() {
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while (!valnos.empty()) {
|
|
VNInfo *VNI = valnos.back();
|
|
valnos.pop_back();
|
|
VNI->~VNInfo();
|
|
}
|
|
|
|
ranges.clear();
|
|
}
|
|
|
|
/// isStackSlot - Return true if this is a stack slot interval.
|
|
///
|
|
bool isStackSlot() const {
|
|
return reg & (1U << (sizeof(unsigned)*CHAR_BIT-1));
|
|
}
|
|
|
|
/// getStackSlotIndex - Return stack slot index if this is a stack slot
|
|
/// interval.
|
|
int getStackSlotIndex() const {
|
|
assert(isStackSlot() && "Interval is not a stack slot interval!");
|
|
return reg & ~(1U << (sizeof(unsigned)*CHAR_BIT-1));
|
|
}
|
|
|
|
bool hasAtLeastOneValue() const { return !valnos.empty(); }
|
|
|
|
bool containsOneValue() const { return valnos.size() == 1; }
|
|
|
|
unsigned getNumValNums() const { return (unsigned)valnos.size(); }
|
|
|
|
/// getValNumInfo - Returns pointer to the specified val#.
|
|
///
|
|
inline VNInfo *getValNumInfo(unsigned ValNo) {
|
|
return valnos[ValNo];
|
|
}
|
|
inline const VNInfo *getValNumInfo(unsigned ValNo) const {
|
|
return valnos[ValNo];
|
|
}
|
|
|
|
/// getNextValue - Create a new value number and return it. MIIdx specifies
|
|
/// the instruction that defines the value number.
|
|
VNInfo *getNextValue(LiveIndex def, MachineInstr *CopyMI,
|
|
bool isDefAccurate, BumpPtrAllocator &VNInfoAllocator){
|
|
VNInfo *VNI =
|
|
static_cast<VNInfo*>(VNInfoAllocator.Allocate((unsigned)sizeof(VNInfo),
|
|
alignof<VNInfo>()));
|
|
new (VNI) VNInfo((unsigned)valnos.size(), def, CopyMI);
|
|
VNI->setIsDefAccurate(isDefAccurate);
|
|
valnos.push_back(VNI);
|
|
return VNI;
|
|
}
|
|
|
|
/// Create a copy of the given value. The new value will be identical except
|
|
/// for the Value number.
|
|
VNInfo *createValueCopy(const VNInfo *orig,
|
|
BumpPtrAllocator &VNInfoAllocator) {
|
|
VNInfo *VNI =
|
|
static_cast<VNInfo*>(VNInfoAllocator.Allocate((unsigned)sizeof(VNInfo),
|
|
alignof<VNInfo>()));
|
|
|
|
new (VNI) VNInfo((unsigned)valnos.size(), *orig);
|
|
valnos.push_back(VNI);
|
|
return VNI;
|
|
}
|
|
|
|
/// addKills - Add a number of kills into the VNInfo kill vector. If this
|
|
/// interval is live at a kill point, then the kill is not added.
|
|
void addKills(VNInfo *VNI, const VNInfo::KillSet &kills) {
|
|
for (unsigned i = 0, e = static_cast<unsigned>(kills.size());
|
|
i != e; ++i) {
|
|
if (!liveBeforeAndAt(kills[i])) {
|
|
VNI->addKill(kills[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// isOnlyLROfValNo - Return true if the specified live range is the only
|
|
/// one defined by the its val#.
|
|
bool isOnlyLROfValNo(const LiveRange *LR) {
|
|
for (const_iterator I = begin(), E = end(); I != E; ++I) {
|
|
const LiveRange *Tmp = I;
|
|
if (Tmp != LR && Tmp->valno == LR->valno)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// MergeValueNumberInto - This method is called when two value nubmers
|
|
/// are found to be equivalent. This eliminates V1, replacing all
|
|
/// LiveRanges with the V1 value number with the V2 value number. This can
|
|
/// cause merging of V1/V2 values numbers and compaction of the value space.
|
|
VNInfo* MergeValueNumberInto(VNInfo *V1, VNInfo *V2);
|
|
|
|
/// MergeInClobberRanges - For any live ranges that are not defined in the
|
|
/// current interval, but are defined in the Clobbers interval, mark them
|
|
/// used with an unknown definition value. Caller must pass in reference to
|
|
/// VNInfoAllocator since it will create a new val#.
|
|
void MergeInClobberRanges(const LiveInterval &Clobbers,
|
|
BumpPtrAllocator &VNInfoAllocator);
|
|
|
|
/// MergeInClobberRange - Same as MergeInClobberRanges except it merge in a
|
|
/// single LiveRange only.
|
|
void MergeInClobberRange(LiveIndex Start,
|
|
LiveIndex End,
|
|
BumpPtrAllocator &VNInfoAllocator);
|
|
|
|
/// MergeValueInAsValue - Merge all of the live ranges of a specific val#
|
|
/// in RHS into this live interval as the specified value number.
|
|
/// The LiveRanges in RHS are allowed to overlap with LiveRanges in the
|
|
/// current interval, it will replace the value numbers of the overlaped
|
|
/// live ranges with the specified value number.
|
|
void MergeRangesInAsValue(const LiveInterval &RHS, VNInfo *LHSValNo);
|
|
|
|
/// MergeValueInAsValue - Merge all of the live ranges of a specific val#
|
|
/// in RHS into this live interval as the specified value number.
|
|
/// The LiveRanges in RHS are allowed to overlap with LiveRanges in the
|
|
/// current interval, but only if the overlapping LiveRanges have the
|
|
/// specified value number.
|
|
void MergeValueInAsValue(const LiveInterval &RHS,
|
|
const VNInfo *RHSValNo, VNInfo *LHSValNo);
|
|
|
|
/// Copy - Copy the specified live interval. This copies all the fields
|
|
/// except for the register of the interval.
|
|
void Copy(const LiveInterval &RHS, MachineRegisterInfo *MRI,
|
|
BumpPtrAllocator &VNInfoAllocator);
|
|
|
|
bool empty() const { return ranges.empty(); }
|
|
|
|
/// beginIndex - Return the lowest numbered slot covered by interval.
|
|
LiveIndex beginIndex() const {
|
|
if (empty())
|
|
return LiveIndex();
|
|
return ranges.front().start;
|
|
}
|
|
|
|
/// endNumber - return the maximum point of the interval of the whole,
|
|
/// exclusive.
|
|
LiveIndex endIndex() const {
|
|
if (empty())
|
|
return LiveIndex();
|
|
return ranges.back().end;
|
|
}
|
|
|
|
bool expiredAt(LiveIndex index) const {
|
|
return index >= endIndex();
|
|
}
|
|
|
|
bool liveAt(LiveIndex index) const;
|
|
|
|
// liveBeforeAndAt - Check if the interval is live at the index and the
|
|
// index just before it. If index is liveAt, check if it starts a new live
|
|
// range.If it does, then check if the previous live range ends at index-1.
|
|
bool liveBeforeAndAt(LiveIndex index) const;
|
|
|
|
/// getLiveRangeContaining - Return the live range that contains the
|
|
/// specified index, or null if there is none.
|
|
const LiveRange *getLiveRangeContaining(LiveIndex Idx) const {
|
|
const_iterator I = FindLiveRangeContaining(Idx);
|
|
return I == end() ? 0 : &*I;
|
|
}
|
|
|
|
/// getLiveRangeContaining - Return the live range that contains the
|
|
/// specified index, or null if there is none.
|
|
LiveRange *getLiveRangeContaining(LiveIndex Idx) {
|
|
iterator I = FindLiveRangeContaining(Idx);
|
|
return I == end() ? 0 : &*I;
|
|
}
|
|
|
|
/// FindLiveRangeContaining - Return an iterator to the live range that
|
|
/// contains the specified index, or end() if there is none.
|
|
const_iterator FindLiveRangeContaining(LiveIndex Idx) const;
|
|
|
|
/// FindLiveRangeContaining - Return an iterator to the live range that
|
|
/// contains the specified index, or end() if there is none.
|
|
iterator FindLiveRangeContaining(LiveIndex Idx);
|
|
|
|
/// findDefinedVNInfo - Find the by the specified
|
|
/// index (register interval) or defined
|
|
VNInfo *findDefinedVNInfoForRegInt(LiveIndex Idx) const;
|
|
|
|
/// findDefinedVNInfo - Find the VNInfo that's defined by the specified
|
|
/// register (stack inteval only).
|
|
VNInfo *findDefinedVNInfoForStackInt(unsigned Reg) const;
|
|
|
|
|
|
/// overlaps - Return true if the intersection of the two live intervals is
|
|
/// not empty.
|
|
bool overlaps(const LiveInterval& other) const {
|
|
return overlapsFrom(other, other.begin());
|
|
}
|
|
|
|
/// overlaps - Return true if the live interval overlaps a range specified
|
|
/// by [Start, End).
|
|
bool overlaps(LiveIndex Start, LiveIndex End) const;
|
|
|
|
/// overlapsFrom - Return true if the intersection of the two live intervals
|
|
/// is not empty. The specified iterator is a hint that we can begin
|
|
/// scanning the Other interval starting at I.
|
|
bool overlapsFrom(const LiveInterval& other, const_iterator I) const;
|
|
|
|
/// addRange - Add the specified LiveRange to this interval, merging
|
|
/// intervals as appropriate. This returns an iterator to the inserted live
|
|
/// range (which may have grown since it was inserted.
|
|
void addRange(LiveRange LR) {
|
|
addRangeFrom(LR, ranges.begin());
|
|
}
|
|
|
|
/// join - Join two live intervals (this, and other) together. This applies
|
|
/// mappings to the value numbers in the LHS/RHS intervals as specified. If
|
|
/// the intervals are not joinable, this aborts.
|
|
void join(LiveInterval &Other, const int *ValNoAssignments,
|
|
const int *RHSValNoAssignments,
|
|
SmallVector<VNInfo*, 16> &NewVNInfo,
|
|
MachineRegisterInfo *MRI);
|
|
|
|
/// isInOneLiveRange - Return true if the range specified is entirely in the
|
|
/// a single LiveRange of the live interval.
|
|
bool isInOneLiveRange(LiveIndex Start, LiveIndex End);
|
|
|
|
/// removeRange - Remove the specified range from this interval. Note that
|
|
/// the range must be a single LiveRange in its entirety.
|
|
void removeRange(LiveIndex Start, LiveIndex End,
|
|
bool RemoveDeadValNo = false);
|
|
|
|
void removeRange(LiveRange LR, bool RemoveDeadValNo = false) {
|
|
removeRange(LR.start, LR.end, RemoveDeadValNo);
|
|
}
|
|
|
|
/// removeValNo - Remove all the ranges defined by the specified value#.
|
|
/// Also remove the value# from value# list.
|
|
void removeValNo(VNInfo *ValNo);
|
|
|
|
/// scaleNumbering - Renumber VNI and ranges to provide gaps for new
|
|
/// instructions.
|
|
void scaleNumbering(unsigned factor);
|
|
|
|
/// getSize - Returns the sum of sizes of all the LiveRange's.
|
|
///
|
|
unsigned getSize() const;
|
|
|
|
/// ComputeJoinedWeight - Set the weight of a live interval after
|
|
/// Other has been merged into it.
|
|
void ComputeJoinedWeight(const LiveInterval &Other);
|
|
|
|
bool operator<(const LiveInterval& other) const {
|
|
const LiveIndex &thisIndex = beginIndex();
|
|
const LiveIndex &otherIndex = other.beginIndex();
|
|
return (thisIndex < otherIndex ||
|
|
(thisIndex == otherIndex && reg < other.reg));
|
|
}
|
|
|
|
void print(raw_ostream &OS, const TargetRegisterInfo *TRI = 0) const;
|
|
void dump() const;
|
|
|
|
private:
|
|
|
|
Ranges::iterator addRangeFrom(LiveRange LR, Ranges::iterator From);
|
|
void extendIntervalEndTo(Ranges::iterator I, LiveIndex NewEnd);
|
|
Ranges::iterator extendIntervalStartTo(Ranges::iterator I, LiveIndex NewStr);
|
|
LiveInterval& operator=(const LiveInterval& rhs); // DO NOT IMPLEMENT
|
|
|
|
};
|
|
|
|
inline raw_ostream &operator<<(raw_ostream &OS, const LiveInterval &LI) {
|
|
LI.print(OS);
|
|
return OS;
|
|
}
|
|
}
|
|
|
|
#endif
|