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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73750 91177308-0d34-0410-b5e6-96231b3b80d8
575 lines
21 KiB
C++
575 lines
21 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/SmallVector.h"
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#include "llvm/Support/Allocator.h"
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#include <iosfwd>
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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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struct LiveInterval;
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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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public:
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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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unsigned def;
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MachineInstr *copy;
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SmallVector<unsigned, 4> kills;
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VNInfo()
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: flags(IS_UNUSED), id(~1U), def(0), 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, unsigned d, MachineInstr *c)
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: flags(IS_DEF_ACCURATE), id(i), def(d), 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), id(i), def(orig.def), copy(orig.copy),
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kills(orig.kills) {}
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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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/// 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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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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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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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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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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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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};
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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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unsigned start; // Start point of the interval (inclusive)
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unsigned 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(unsigned S, unsigned E, VNInfo *V) : 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(unsigned I) const {
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return start <= I && I < 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(std::ostream &os) const;
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void print(std::ostream *os) const { if (os) print(*os); }
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private:
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LiveRange(); // DO NOT IMPLEMENT
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};
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std::ostream& operator<<(std::ostream& os, const LiveRange &LR);
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inline bool operator<(unsigned 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, unsigned 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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struct LiveInterval {
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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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public:
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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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static unsigned scale(unsigned slot, unsigned factor) {
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unsigned index = slot / NUM,
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offset = slot % NUM;
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assert(index <= ~0U / (factor * NUM) &&
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"Rescaled interval would overflow");
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return index * NUM * factor + offset;
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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, unsigned Pos) {
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if (Pos >= endNumber())
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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()) {
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VNInfo *VNI = valnos.back();
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valnos.pop_back();
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VNI->~VNInfo();
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}
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ranges.clear();
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}
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/// isStackSlot - Return true if this is a stack slot interval.
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///
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bool isStackSlot() const {
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return reg & (1U << (sizeof(unsigned)*CHAR_BIT-1));
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}
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/// getStackSlotIndex - Return stack slot index if this is a stack slot
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/// interval.
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int getStackSlotIndex() const {
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assert(isStackSlot() && "Interval is not a stack slot interval!");
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return reg & ~(1U << (sizeof(unsigned)*CHAR_BIT-1));
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}
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bool hasAtLeastOneValue() const { return !valnos.empty(); }
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bool containsOneValue() const { return valnos.size() == 1; }
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unsigned getNumValNums() const { return (unsigned)valnos.size(); }
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/// getValNumInfo - Returns pointer to the specified val#.
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///
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inline VNInfo *getValNumInfo(unsigned ValNo) {
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return valnos[ValNo];
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}
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inline const VNInfo *getValNumInfo(unsigned ValNo) const {
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return valnos[ValNo];
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}
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/// copyValNumInfo - Copy the value number info for one value number to
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/// another.
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void copyValNumInfo(VNInfo *DstValNo, const VNInfo *SrcValNo) {
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DstValNo->def = SrcValNo->def;
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DstValNo->copy = SrcValNo->copy;
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DstValNo->setFlags(SrcValNo->getFlags());
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DstValNo->kills = SrcValNo->kills;
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}
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/// getNextValue - Create a new value number and return it. MIIdx specifies
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/// the instruction that defines the value number.
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VNInfo *getNextValue(unsigned MIIdx, MachineInstr *CopyMI,
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bool isDefAccurate, BumpPtrAllocator &VNInfoAllocator) {
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assert(MIIdx != ~0u && MIIdx != ~1u &&
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"PHI def / unused flags should now be passed explicitly.");
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#ifdef __GNUC__
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unsigned Alignment = (unsigned)__alignof__(VNInfo);
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#else
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// FIXME: ugly.
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unsigned Alignment = 8;
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#endif
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VNInfo *VNI =
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static_cast<VNInfo*>(VNInfoAllocator.Allocate((unsigned)sizeof(VNInfo),
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Alignment));
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new (VNI) VNInfo((unsigned)valnos.size(), MIIdx, CopyMI);
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VNI->setIsDefAccurate(isDefAccurate);
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valnos.push_back(VNI);
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return VNI;
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}
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/// Create a copy of the given value. The new value will be identical except
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/// for the Value number.
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VNInfo *createValueCopy(const VNInfo *orig, BumpPtrAllocator &VNInfoAllocator) {
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#ifdef __GNUC__
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unsigned Alignment = (unsigned)__alignof__(VNInfo);
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#else
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// FIXME: ugly.
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unsigned Alignment = 8;
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#endif
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VNInfo *VNI =
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static_cast<VNInfo*>(VNInfoAllocator.Allocate((unsigned)sizeof(VNInfo),
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Alignment));
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new (VNI) VNInfo((unsigned)valnos.size(), *orig);
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valnos.push_back(VNI);
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return VNI;
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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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static void addKill(VNInfo *VNI, unsigned KillIdx) {
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SmallVector<unsigned, 4> &kills = VNI->kills;
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if (kills.empty()) {
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kills.push_back(KillIdx);
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} else {
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SmallVector<unsigned, 4>::iterator
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I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
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kills.insert(I, KillIdx);
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}
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}
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/// addKills - Add a number of kills into the VNInfo kill vector. If this
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/// interval is live at a kill point, then the kill is not added.
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void addKills(VNInfo *VNI, const SmallVector<unsigned, 4> &kills) {
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for (unsigned i = 0, e = static_cast<unsigned>(kills.size());
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i != e; ++i) {
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unsigned KillIdx = kills[i];
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if (!liveBeforeAndAt(KillIdx)) {
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SmallVector<unsigned, 4>::iterator
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I = std::lower_bound(VNI->kills.begin(), VNI->kills.end(), KillIdx);
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VNI->kills.insert(I, KillIdx);
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}
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}
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}
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/// removeKill - Remove the specified kill from the list of kills of
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/// the specified val#.
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static bool removeKill(VNInfo *VNI, unsigned KillIdx) {
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SmallVector<unsigned, 4> &kills = VNI->kills;
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SmallVector<unsigned, 4>::iterator
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I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
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if (I != kills.end() && *I == KillIdx) {
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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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/// removeKills - Remove all the kills in specified range
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/// [Start, End] of the specified val#.
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static void removeKills(VNInfo *VNI, unsigned Start, unsigned End) {
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SmallVector<unsigned, 4> &kills = VNI->kills;
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SmallVector<unsigned, 4>::iterator
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I = std::lower_bound(kills.begin(), kills.end(), Start);
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SmallVector<unsigned, 4>::iterator
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E = std::upper_bound(kills.begin(), kills.end(), End);
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kills.erase(I, E);
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}
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/// isKill - Return true if the specified index is a kill of the
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/// specified val#.
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static bool isKill(const VNInfo *VNI, unsigned KillIdx) {
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const SmallVector<unsigned, 4> &kills = VNI->kills;
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SmallVector<unsigned, 4>::const_iterator
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I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
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return I != kills.end() && *I == KillIdx;
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}
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/// isOnlyLROfValNo - Return true if the specified live range is the only
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/// one defined by the its val#.
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bool isOnlyLROfValNo( const LiveRange *LR) {
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for (const_iterator I = begin(), E = end(); I != E; ++I) {
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const LiveRange *Tmp = I;
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if (Tmp != LR && Tmp->valno == LR->valno)
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return false;
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}
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return true;
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}
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/// MergeValueNumberInto - This method is called when two value nubmers
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/// are found to be equivalent. This eliminates V1, replacing all
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/// LiveRanges with the V1 value number with the V2 value number. This can
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/// cause merging of V1/V2 values numbers and compaction of the value space.
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VNInfo* MergeValueNumberInto(VNInfo *V1, VNInfo *V2);
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/// MergeInClobberRanges - For any live ranges that are not defined in the
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/// current interval, but are defined in the Clobbers interval, mark them
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/// used with an unknown definition value. Caller must pass in reference to
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/// VNInfoAllocator since it will create a new val#.
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void MergeInClobberRanges(const LiveInterval &Clobbers,
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BumpPtrAllocator &VNInfoAllocator);
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/// MergeInClobberRange - Same as MergeInClobberRanges except it merge in a
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/// single LiveRange only.
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void MergeInClobberRange(unsigned Start, unsigned End,
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BumpPtrAllocator &VNInfoAllocator);
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/// MergeValueInAsValue - Merge all of the live ranges of a specific val#
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/// in RHS into this live interval as the specified value number.
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/// The LiveRanges in RHS are allowed to overlap with LiveRanges in the
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/// current interval, it will replace the value numbers of the overlaped
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/// live ranges with the specified value number.
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void MergeRangesInAsValue(const LiveInterval &RHS, VNInfo *LHSValNo);
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/// MergeValueInAsValue - Merge all of the live ranges of a specific val#
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/// in RHS into this live interval as the specified value number.
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/// The LiveRanges in RHS are allowed to overlap with LiveRanges in the
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/// current interval, but only if the overlapping LiveRanges have the
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/// specified value number.
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void MergeValueInAsValue(const LiveInterval &RHS,
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const VNInfo *RHSValNo, VNInfo *LHSValNo);
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/// Copy - Copy the specified live interval. This copies all the fields
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/// except for the register of the interval.
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void Copy(const LiveInterval &RHS, MachineRegisterInfo *MRI,
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BumpPtrAllocator &VNInfoAllocator);
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bool empty() const { return ranges.empty(); }
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/// beginNumber - Return the lowest numbered slot covered by interval.
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unsigned beginNumber() const {
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if (empty())
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return 0;
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return ranges.front().start;
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}
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/// endNumber - return the maximum point of the interval of the whole,
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/// exclusive.
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unsigned endNumber() const {
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if (empty())
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return 0;
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return ranges.back().end;
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}
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bool expiredAt(unsigned index) const {
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return index >= endNumber();
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}
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bool liveAt(unsigned index) const;
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// liveBeforeAndAt - Check if the interval is live at the index and the
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// index just before it. If index is liveAt, check if it starts a new live
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// range.If it does, then check if the previous live range ends at index-1.
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bool liveBeforeAndAt(unsigned index) const;
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/// getLiveRangeContaining - Return the live range that contains the
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/// specified index, or null if there is none.
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const LiveRange *getLiveRangeContaining(unsigned Idx) const {
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const_iterator I = FindLiveRangeContaining(Idx);
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return I == end() ? 0 : &*I;
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}
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/// FindLiveRangeContaining - Return an iterator to the live range that
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/// contains the specified index, or end() if there is none.
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const_iterator FindLiveRangeContaining(unsigned Idx) const;
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/// FindLiveRangeContaining - Return an iterator to the live range that
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/// contains the specified index, or end() if there is none.
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iterator FindLiveRangeContaining(unsigned Idx);
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|
|
|
/// findDefinedVNInfo - Find the VNInfo that's defined at the specified
|
|
/// index (register interval) or defined by the specified register (stack
|
|
/// inteval).
|
|
VNInfo *findDefinedVNInfo(unsigned DefIdxOrReg) const;
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|
|
|
/// 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());
|
|
}
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|
|
|
/// overlaps - Return true if the live interval overlaps a range specified
|
|
/// by [Start, End).
|
|
bool overlaps(unsigned Start, unsigned 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(unsigned Start, unsigned End);
|
|
|
|
/// removeRange - Remove the specified range from this interval. Note that
|
|
/// the range must be a single LiveRange in its entirety.
|
|
void removeRange(unsigned Start, unsigned 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;
|
|
|
|
bool operator<(const LiveInterval& other) const {
|
|
return beginNumber() < other.beginNumber();
|
|
}
|
|
|
|
void print(std::ostream &OS, const TargetRegisterInfo *TRI = 0) const;
|
|
void print(std::ostream *OS, const TargetRegisterInfo *TRI = 0) const {
|
|
if (OS) print(*OS, TRI);
|
|
}
|
|
void dump() const;
|
|
|
|
private:
|
|
Ranges::iterator addRangeFrom(LiveRange LR, Ranges::iterator From);
|
|
void extendIntervalEndTo(Ranges::iterator I, unsigned NewEnd);
|
|
Ranges::iterator extendIntervalStartTo(Ranges::iterator I, unsigned NewStr);
|
|
LiveInterval& operator=(const LiveInterval& rhs); // DO NOT IMPLEMENT
|
|
};
|
|
|
|
inline std::ostream &operator<<(std::ostream &OS, const LiveInterval &LI) {
|
|
LI.print(OS);
|
|
return OS;
|
|
}
|
|
}
|
|
|
|
#endif
|