mirror of
https://github.com/c64scene-ar/llvm-6502.git
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Factor a bunch of classes out into a public header
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12958 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
4950e88e0f
commit
0a7f98c80d
@ -63,7 +63,7 @@
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/ScalarEvolutionExpressions.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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@ -101,13 +101,6 @@ namespace {
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// Implementation of the SCEV class.
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//
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namespace {
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enum SCEVTypes {
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// These should be ordered in terms of increasing complexity to make the
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// folders simpler.
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scConstant, scTruncate, scZeroExtend, scAddExpr, scMulExpr, scUDivExpr,
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scAddRecExpr, scUnknown, scCouldNotCompute
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};
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/// SCEVComplexityCompare - Return true if the complexity of the LHS is less
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/// than the complexity of the RHS. If the SCEVs have identical complexity,
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/// order them by their addresses. This comparator is used to canonicalize
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@ -172,593 +165,181 @@ bool SCEVCouldNotCompute::classof(const SCEV *S) {
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}
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//===----------------------------------------------------------------------===//
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// SCEVConstant - This class represents a constant integer value.
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//
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namespace {
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class SCEVConstant;
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// SCEVConstants - Only allow the creation of one SCEVConstant for any
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// particular value. Don't use a SCEVHandle here, or else the object will
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// never be deleted!
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std::map<ConstantInt*, SCEVConstant*> SCEVConstants;
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// SCEVConstants - Only allow the creation of one SCEVConstant for any
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// particular value. Don't use a SCEVHandle here, or else the object will
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// never be deleted!
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static std::map<ConstantInt*, SCEVConstant*> SCEVConstants;
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class SCEVConstant : public SCEV {
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ConstantInt *V;
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SCEVConstant(ConstantInt *v) : SCEV(scConstant), V(v) {}
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SCEVConstant::~SCEVConstant() {
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SCEVConstants.erase(V);
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}
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virtual ~SCEVConstant() {
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SCEVConstants.erase(V);
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}
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public:
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/// get method - This just gets and returns a new SCEVConstant object.
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///
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static SCEVHandle get(ConstantInt *V) {
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// Make sure that SCEVConstant instances are all unsigned.
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if (V->getType()->isSigned()) {
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const Type *NewTy = V->getType()->getUnsignedVersion();
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V = cast<ConstantUInt>(ConstantExpr::getCast(V, NewTy));
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}
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SCEVHandle SCEVConstant::get(ConstantInt *V) {
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// Make sure that SCEVConstant instances are all unsigned.
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if (V->getType()->isSigned()) {
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const Type *NewTy = V->getType()->getUnsignedVersion();
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V = cast<ConstantUInt>(ConstantExpr::getCast(V, NewTy));
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}
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SCEVConstant *&R = SCEVConstants[V];
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if (R == 0) R = new SCEVConstant(V);
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return R;
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}
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SCEVConstant *&R = SCEVConstants[V];
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if (R == 0) R = new SCEVConstant(V);
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return R;
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}
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ConstantRange SCEVConstant::getValueRange() const {
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return ConstantRange(V);
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}
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ConstantInt *getValue() const { return V; }
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const Type *SCEVConstant::getType() const { return V->getType(); }
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/// getValueRange - Return the tightest constant bounds that this value is
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/// known to have. This method is only valid on integer SCEV objects.
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virtual ConstantRange getValueRange() const {
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return ConstantRange(V);
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}
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void SCEVConstant::print(std::ostream &OS) const {
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WriteAsOperand(OS, V, false);
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}
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virtual bool isLoopInvariant(const Loop *L) const {
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return true;
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}
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// SCEVTruncates - Only allow the creation of one SCEVTruncateExpr for any
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// particular input. Don't use a SCEVHandle here, or else the object will
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// never be deleted!
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static std::map<std::pair<SCEV*, const Type*>, SCEVTruncateExpr*> SCEVTruncates;
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virtual bool hasComputableLoopEvolution(const Loop *L) const {
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return false; // Not loop variant
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}
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SCEVTruncateExpr::SCEVTruncateExpr(const SCEVHandle &op, const Type *ty)
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: SCEV(scTruncate), Op(op), Ty(ty) {
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assert(Op->getType()->isInteger() && Ty->isInteger() &&
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Ty->isUnsigned() &&
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"Cannot truncate non-integer value!");
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assert(Op->getType()->getPrimitiveSize() > Ty->getPrimitiveSize() &&
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"This is not a truncating conversion!");
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}
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virtual const Type *getType() const { return V->getType(); }
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SCEVTruncateExpr::~SCEVTruncateExpr() {
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SCEVTruncates.erase(std::make_pair(Op, Ty));
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}
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Value *expandCodeFor(ScalarEvolutionRewriter &SER,
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Instruction *InsertPt) {
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return getValue();
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}
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virtual void print(std::ostream &OS) const {
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WriteAsOperand(OS, V, false);
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}
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ConstantRange SCEVTruncateExpr::getValueRange() const {
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return getOperand()->getValueRange().truncate(getType());
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}
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const SCEVConstant *S) { return true; }
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static inline bool classof(const SCEV *S) {
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return S->getSCEVType() == scConstant;
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}
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};
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void SCEVTruncateExpr::print(std::ostream &OS) const {
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OS << "(truncate " << *Op << " to " << *Ty << ")";
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}
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// SCEVZeroExtends - Only allow the creation of one SCEVZeroExtendExpr for any
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// particular input. Don't use a SCEVHandle here, or else the object will never
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// be deleted!
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static std::map<std::pair<SCEV*, const Type*>,
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SCEVZeroExtendExpr*> SCEVZeroExtends;
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SCEVZeroExtendExpr::SCEVZeroExtendExpr(const SCEVHandle &op, const Type *ty)
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: SCEV(scTruncate), Op(Op), Ty(ty) {
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assert(Op->getType()->isInteger() && Ty->isInteger() &&
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Ty->isUnsigned() &&
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"Cannot zero extend non-integer value!");
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assert(Op->getType()->getPrimitiveSize() < Ty->getPrimitiveSize() &&
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"This is not an extending conversion!");
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}
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SCEVZeroExtendExpr::~SCEVZeroExtendExpr() {
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SCEVZeroExtends.erase(std::make_pair(Op, Ty));
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}
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ConstantRange SCEVZeroExtendExpr::getValueRange() const {
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return getOperand()->getValueRange().zeroExtend(getType());
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}
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void SCEVZeroExtendExpr::print(std::ostream &OS) const {
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OS << "(zeroextend " << *Op << " to " << *Ty << ")";
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}
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// SCEVCommExprs - Only allow the creation of one SCEVCommutativeExpr for any
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// particular input. Don't use a SCEVHandle here, or else the object will never
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// be deleted!
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static std::map<std::pair<unsigned, std::vector<SCEV*> >,
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SCEVCommutativeExpr*> SCEVCommExprs;
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SCEVCommutativeExpr::~SCEVCommutativeExpr() {
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SCEVCommExprs.erase(std::make_pair(getSCEVType(),
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std::vector<SCEV*>(Operands.begin(),
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Operands.end())));
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}
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void SCEVCommutativeExpr::print(std::ostream &OS) const {
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assert(Operands.size() > 1 && "This plus expr shouldn't exist!");
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const char *OpStr = getOperationStr();
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OS << "(" << *Operands[0];
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for (unsigned i = 1, e = Operands.size(); i != e; ++i)
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OS << OpStr << *Operands[i];
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OS << ")";
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}
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// SCEVUDivs - Only allow the creation of one SCEVUDivExpr for any particular
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// input. Don't use a SCEVHandle here, or else the object will never be
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// deleted!
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static std::map<std::pair<SCEV*, SCEV*>, SCEVUDivExpr*> SCEVUDivs;
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SCEVUDivExpr::~SCEVUDivExpr() {
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SCEVUDivs.erase(std::make_pair(LHS, RHS));
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}
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void SCEVUDivExpr::print(std::ostream &OS) const {
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OS << "(" << *LHS << " /u " << *RHS << ")";
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}
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const Type *SCEVUDivExpr::getType() const {
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const Type *Ty = LHS->getType();
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if (Ty->isSigned()) Ty = Ty->getUnsignedVersion();
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return Ty;
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}
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// SCEVAddRecExprs - Only allow the creation of one SCEVAddRecExpr for any
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// particular input. Don't use a SCEVHandle here, or else the object will never
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// be deleted!
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static std::map<std::pair<const Loop *, std::vector<SCEV*> >,
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SCEVAddRecExpr*> SCEVAddRecExprs;
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SCEVAddRecExpr::~SCEVAddRecExpr() {
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SCEVAddRecExprs.erase(std::make_pair(L,
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std::vector<SCEV*>(Operands.begin(),
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Operands.end())));
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}
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bool SCEVAddRecExpr::isLoopInvariant(const Loop *QueryLoop) const {
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// This recurrence is invariant w.r.t to QueryLoop iff QueryLoop doesn't
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// contain L.
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return !QueryLoop->contains(L->getHeader());
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}
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//===----------------------------------------------------------------------===//
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// SCEVTruncateExpr - This class represents a truncation of an integer value to
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// a smaller integer value.
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//
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namespace {
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class SCEVTruncateExpr;
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// SCEVTruncates - Only allow the creation of one SCEVTruncateExpr for any
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// particular input. Don't use a SCEVHandle here, or else the object will
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// never be deleted!
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std::map<std::pair<SCEV*, const Type*>, SCEVTruncateExpr*> SCEVTruncates;
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void SCEVAddRecExpr::print(std::ostream &OS) const {
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OS << "{" << *Operands[0];
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for (unsigned i = 1, e = Operands.size(); i != e; ++i)
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OS << ",+," << *Operands[i];
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OS << "}<" << L->getHeader()->getName() + ">";
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}
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class SCEVTruncateExpr : public SCEV {
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SCEVHandle Op;
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const Type *Ty;
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SCEVTruncateExpr(const SCEVHandle &op, const Type *ty)
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: SCEV(scTruncate), Op(op), Ty(ty) {
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assert(Op->getType()->isInteger() && Ty->isInteger() &&
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Ty->isUnsigned() &&
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"Cannot truncate non-integer value!");
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assert(Op->getType()->getPrimitiveSize() > Ty->getPrimitiveSize() &&
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"This is not a truncating conversion!");
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}
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// SCEVUnknowns - Only allow the creation of one SCEVUnknown for any particular
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// value. Don't use a SCEVHandle here, or else the object will never be
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// deleted!
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static std::map<Value*, SCEVUnknown*> SCEVUnknowns;
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virtual ~SCEVTruncateExpr() {
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SCEVTruncates.erase(std::make_pair(Op, Ty));
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}
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public:
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/// get method - This just gets and returns a new SCEVTruncate object
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///
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static SCEVHandle get(const SCEVHandle &Op, const Type *Ty);
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SCEVUnknown::~SCEVUnknown() { SCEVUnknowns.erase(V); }
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const SCEVHandle &getOperand() const { return Op; }
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virtual const Type *getType() const { return Ty; }
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virtual bool isLoopInvariant(const Loop *L) const {
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return Op->isLoopInvariant(L);
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}
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bool SCEVUnknown::isLoopInvariant(const Loop *L) const {
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// All non-instruction values are loop invariant. All instructions are loop
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// invariant if they are not contained in the specified loop.
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if (Instruction *I = dyn_cast<Instruction>(V))
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return !L->contains(I->getParent());
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return true;
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}
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virtual bool hasComputableLoopEvolution(const Loop *L) const {
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return Op->hasComputableLoopEvolution(L);
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}
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const Type *SCEVUnknown::getType() const {
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return V->getType();
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}
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/// getValueRange - Return the tightest constant bounds that this value is
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/// known to have. This method is only valid on integer SCEV objects.
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virtual ConstantRange getValueRange() const {
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return getOperand()->getValueRange().truncate(getType());
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}
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Value *expandCodeFor(ScalarEvolutionRewriter &SER,
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Instruction *InsertPt);
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virtual void print(std::ostream &OS) const {
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OS << "(truncate " << *Op << " to " << *Ty << ")";
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}
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const SCEVTruncateExpr *S) { return true; }
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static inline bool classof(const SCEV *S) {
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return S->getSCEVType() == scTruncate;
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}
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};
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void SCEVUnknown::print(std::ostream &OS) const {
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WriteAsOperand(OS, V, false);
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}
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//===----------------------------------------------------------------------===//
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// SCEVZeroExtendExpr - This class represents a zero extension of a small
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// integer value to a larger integer value.
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//
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namespace {
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class SCEVZeroExtendExpr;
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// SCEVZeroExtends - Only allow the creation of one SCEVZeroExtendExpr for any
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// particular input. Don't use a SCEVHandle here, or else the object will
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// never be deleted!
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std::map<std::pair<SCEV*, const Type*>, SCEVZeroExtendExpr*> SCEVZeroExtends;
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class SCEVZeroExtendExpr : public SCEV {
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SCEVHandle Op;
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const Type *Ty;
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SCEVZeroExtendExpr(const SCEVHandle &op, const Type *ty)
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: SCEV(scTruncate), Op(Op), Ty(ty) {
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assert(Op->getType()->isInteger() && Ty->isInteger() &&
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Ty->isUnsigned() &&
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"Cannot zero extend non-integer value!");
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assert(Op->getType()->getPrimitiveSize() < Ty->getPrimitiveSize() &&
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"This is not an extending conversion!");
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}
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virtual ~SCEVZeroExtendExpr() {
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SCEVZeroExtends.erase(std::make_pair(Op, Ty));
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}
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public:
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/// get method - This just gets and returns a new SCEVZeroExtend object
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///
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static SCEVHandle get(const SCEVHandle &Op, const Type *Ty);
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const SCEVHandle &getOperand() const { return Op; }
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virtual const Type *getType() const { return Ty; }
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virtual bool isLoopInvariant(const Loop *L) const {
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return Op->isLoopInvariant(L);
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}
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virtual bool hasComputableLoopEvolution(const Loop *L) const {
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return Op->hasComputableLoopEvolution(L);
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}
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/// getValueRange - Return the tightest constant bounds that this value is
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/// known to have. This method is only valid on integer SCEV objects.
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virtual ConstantRange getValueRange() const {
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return getOperand()->getValueRange().zeroExtend(getType());
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}
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Value *expandCodeFor(ScalarEvolutionRewriter &SER,
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Instruction *InsertPt);
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virtual void print(std::ostream &OS) const {
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OS << "(zeroextend " << *Op << " to " << *Ty << ")";
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}
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const SCEVZeroExtendExpr *S) { return true; }
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static inline bool classof(const SCEV *S) {
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return S->getSCEVType() == scZeroExtend;
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}
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};
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}
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//===----------------------------------------------------------------------===//
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// SCEVCommutativeExpr - This node is the base class for n'ary commutative
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// operators.
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namespace {
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class SCEVCommutativeExpr;
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// SCEVCommExprs - Only allow the creation of one SCEVCommutativeExpr for any
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// particular input. Don't use a SCEVHandle here, or else the object will
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// never be deleted!
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std::map<std::pair<unsigned, std::vector<SCEV*> >,
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SCEVCommutativeExpr*> SCEVCommExprs;
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class SCEVCommutativeExpr : public SCEV {
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std::vector<SCEVHandle> Operands;
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protected:
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SCEVCommutativeExpr(enum SCEVTypes T, const std::vector<SCEVHandle> &ops)
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: SCEV(T) {
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Operands.reserve(ops.size());
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Operands.insert(Operands.end(), ops.begin(), ops.end());
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}
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~SCEVCommutativeExpr() {
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SCEVCommExprs.erase(std::make_pair(getSCEVType(),
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std::vector<SCEV*>(Operands.begin(),
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Operands.end())));
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}
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public:
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unsigned getNumOperands() const { return Operands.size(); }
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const SCEVHandle &getOperand(unsigned i) const {
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assert(i < Operands.size() && "Operand index out of range!");
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return Operands[i];
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}
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const std::vector<SCEVHandle> &getOperands() const { return Operands; }
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typedef std::vector<SCEVHandle>::const_iterator op_iterator;
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op_iterator op_begin() const { return Operands.begin(); }
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op_iterator op_end() const { return Operands.end(); }
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virtual bool isLoopInvariant(const Loop *L) const {
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for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
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if (!getOperand(i)->isLoopInvariant(L)) return false;
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return true;
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}
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virtual bool hasComputableLoopEvolution(const Loop *L) const {
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for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
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if (getOperand(i)->hasComputableLoopEvolution(L)) return true;
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return false;
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}
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virtual const Type *getType() const { return getOperand(0)->getType(); }
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virtual const char *getOperationStr() const = 0;
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virtual void print(std::ostream &OS) const {
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assert(Operands.size() > 1 && "This plus expr shouldn't exist!");
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const char *OpStr = getOperationStr();
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OS << "(" << *Operands[0];
|
||||
for (unsigned i = 1, e = Operands.size(); i != e; ++i)
|
||||
OS << OpStr << *Operands[i];
|
||||
OS << ")";
|
||||
}
|
||||
|
||||
/// Methods for support type inquiry through isa, cast, and dyn_cast:
|
||||
static inline bool classof(const SCEVCommutativeExpr *S) { return true; }
|
||||
static inline bool classof(const SCEV *S) {
|
||||
return S->getSCEVType() == scAddExpr ||
|
||||
S->getSCEVType() == scMulExpr;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// SCEVAddExpr - This node represents an addition of some number of SCEV's.
|
||||
//
|
||||
namespace {
|
||||
class SCEVAddExpr : public SCEVCommutativeExpr {
|
||||
SCEVAddExpr(const std::vector<SCEVHandle> &ops)
|
||||
: SCEVCommutativeExpr(scAddExpr, ops) {
|
||||
}
|
||||
|
||||
public:
|
||||
static SCEVHandle get(std::vector<SCEVHandle> &Ops);
|
||||
|
||||
static SCEVHandle get(const SCEVHandle &LHS, const SCEVHandle &RHS) {
|
||||
std::vector<SCEVHandle> Ops;
|
||||
Ops.push_back(LHS);
|
||||
Ops.push_back(RHS);
|
||||
return get(Ops);
|
||||
}
|
||||
|
||||
static SCEVHandle get(const SCEVHandle &Op0, const SCEVHandle &Op1,
|
||||
const SCEVHandle &Op2) {
|
||||
std::vector<SCEVHandle> Ops;
|
||||
Ops.push_back(Op0);
|
||||
Ops.push_back(Op1);
|
||||
Ops.push_back(Op2);
|
||||
return get(Ops);
|
||||
}
|
||||
|
||||
virtual const char *getOperationStr() const { return " + "; }
|
||||
|
||||
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
|
||||
Instruction *InsertPt);
|
||||
|
||||
/// Methods for support type inquiry through isa, cast, and dyn_cast:
|
||||
static inline bool classof(const SCEVAddExpr *S) { return true; }
|
||||
static inline bool classof(const SCEV *S) {
|
||||
return S->getSCEVType() == scAddExpr;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// SCEVMulExpr - This node represents multiplication of some number of SCEV's.
|
||||
//
|
||||
namespace {
|
||||
class SCEVMulExpr : public SCEVCommutativeExpr {
|
||||
SCEVMulExpr(const std::vector<SCEVHandle> &ops)
|
||||
: SCEVCommutativeExpr(scMulExpr, ops) {
|
||||
}
|
||||
|
||||
public:
|
||||
static SCEVHandle get(std::vector<SCEVHandle> &Ops);
|
||||
|
||||
static SCEVHandle get(const SCEVHandle &LHS, const SCEVHandle &RHS) {
|
||||
std::vector<SCEVHandle> Ops;
|
||||
Ops.push_back(LHS);
|
||||
Ops.push_back(RHS);
|
||||
return get(Ops);
|
||||
}
|
||||
|
||||
virtual const char *getOperationStr() const { return " * "; }
|
||||
|
||||
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
|
||||
Instruction *InsertPt);
|
||||
|
||||
/// Methods for support type inquiry through isa, cast, and dyn_cast:
|
||||
static inline bool classof(const SCEVMulExpr *S) { return true; }
|
||||
static inline bool classof(const SCEV *S) {
|
||||
return S->getSCEVType() == scMulExpr;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// SCEVUDivExpr - This class represents a binary unsigned division operation.
|
||||
//
|
||||
namespace {
|
||||
class SCEVUDivExpr;
|
||||
// SCEVUDivs - Only allow the creation of one SCEVUDivExpr for any particular
|
||||
// input. Don't use a SCEVHandle here, or else the object will never be
|
||||
// deleted!
|
||||
std::map<std::pair<SCEV*, SCEV*>, SCEVUDivExpr*> SCEVUDivs;
|
||||
|
||||
class SCEVUDivExpr : public SCEV {
|
||||
SCEVHandle LHS, RHS;
|
||||
SCEVUDivExpr(const SCEVHandle &lhs, const SCEVHandle &rhs)
|
||||
: SCEV(scUDivExpr), LHS(lhs), RHS(rhs) {}
|
||||
|
||||
virtual ~SCEVUDivExpr() {
|
||||
SCEVUDivs.erase(std::make_pair(LHS, RHS));
|
||||
}
|
||||
public:
|
||||
/// get method - This just gets and returns a new SCEVUDiv object.
|
||||
///
|
||||
static SCEVHandle get(const SCEVHandle &LHS, const SCEVHandle &RHS);
|
||||
|
||||
const SCEVHandle &getLHS() const { return LHS; }
|
||||
const SCEVHandle &getRHS() const { return RHS; }
|
||||
|
||||
virtual bool isLoopInvariant(const Loop *L) const {
|
||||
return LHS->isLoopInvariant(L) && RHS->isLoopInvariant(L);
|
||||
}
|
||||
|
||||
virtual bool hasComputableLoopEvolution(const Loop *L) const {
|
||||
return LHS->hasComputableLoopEvolution(L) &&
|
||||
RHS->hasComputableLoopEvolution(L);
|
||||
}
|
||||
|
||||
virtual const Type *getType() const {
|
||||
const Type *Ty = LHS->getType();
|
||||
if (Ty->isSigned()) Ty = Ty->getUnsignedVersion();
|
||||
return Ty;
|
||||
}
|
||||
|
||||
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
|
||||
Instruction *InsertPt);
|
||||
|
||||
virtual void print(std::ostream &OS) const {
|
||||
OS << "(" << *LHS << " /u " << *RHS << ")";
|
||||
}
|
||||
|
||||
/// Methods for support type inquiry through isa, cast, and dyn_cast:
|
||||
static inline bool classof(const SCEVUDivExpr *S) { return true; }
|
||||
static inline bool classof(const SCEV *S) {
|
||||
return S->getSCEVType() == scUDivExpr;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
// SCEVAddRecExpr - This node represents a polynomial recurrence on the trip
|
||||
// count of the specified loop.
|
||||
//
|
||||
// All operands of an AddRec are required to be loop invariant.
|
||||
//
|
||||
namespace {
|
||||
class SCEVAddRecExpr;
|
||||
// SCEVAddRecExprs - Only allow the creation of one SCEVAddRecExpr for any
|
||||
// particular input. Don't use a SCEVHandle here, or else the object will
|
||||
// never be deleted!
|
||||
std::map<std::pair<const Loop *, std::vector<SCEV*> >,
|
||||
SCEVAddRecExpr*> SCEVAddRecExprs;
|
||||
|
||||
class SCEVAddRecExpr : public SCEV {
|
||||
std::vector<SCEVHandle> Operands;
|
||||
const Loop *L;
|
||||
|
||||
SCEVAddRecExpr(const std::vector<SCEVHandle> &ops, const Loop *l)
|
||||
: SCEV(scAddRecExpr), Operands(ops), L(l) {
|
||||
for (unsigned i = 0, e = Operands.size(); i != e; ++i)
|
||||
assert(Operands[i]->isLoopInvariant(l) &&
|
||||
"Operands of AddRec must be loop-invariant!");
|
||||
}
|
||||
~SCEVAddRecExpr() {
|
||||
SCEVAddRecExprs.erase(std::make_pair(L,
|
||||
std::vector<SCEV*>(Operands.begin(),
|
||||
Operands.end())));
|
||||
}
|
||||
public:
|
||||
static SCEVHandle get(const SCEVHandle &Start, const SCEVHandle &Step,
|
||||
const Loop *);
|
||||
static SCEVHandle get(std::vector<SCEVHandle> &Operands,
|
||||
const Loop *);
|
||||
static SCEVHandle get(const std::vector<SCEVHandle> &Operands,
|
||||
const Loop *L) {
|
||||
std::vector<SCEVHandle> NewOp(Operands);
|
||||
return get(NewOp, L);
|
||||
}
|
||||
|
||||
typedef std::vector<SCEVHandle>::const_iterator op_iterator;
|
||||
op_iterator op_begin() const { return Operands.begin(); }
|
||||
op_iterator op_end() const { return Operands.end(); }
|
||||
|
||||
unsigned getNumOperands() const { return Operands.size(); }
|
||||
const SCEVHandle &getOperand(unsigned i) const { return Operands[i]; }
|
||||
const SCEVHandle &getStart() const { return Operands[0]; }
|
||||
const Loop *getLoop() const { return L; }
|
||||
|
||||
|
||||
/// getStepRecurrence - This method constructs and returns the recurrence
|
||||
/// indicating how much this expression steps by. If this is a polynomial
|
||||
/// of degree N, it returns a chrec of degree N-1.
|
||||
SCEVHandle getStepRecurrence() const {
|
||||
if (getNumOperands() == 2) return getOperand(1);
|
||||
return SCEVAddRecExpr::get(std::vector<SCEVHandle>(op_begin()+1,op_end()),
|
||||
getLoop());
|
||||
}
|
||||
|
||||
virtual bool hasComputableLoopEvolution(const Loop *QL) const {
|
||||
if (L == QL) return true;
|
||||
/// FIXME: What if the start or step value a recurrence for the specified
|
||||
/// loop?
|
||||
return false;
|
||||
}
|
||||
|
||||
|
||||
virtual bool isLoopInvariant(const Loop *QueryLoop) const {
|
||||
// This recurrence is invariant w.r.t to QueryLoop iff QueryLoop doesn't
|
||||
// contain L.
|
||||
return !QueryLoop->contains(L->getHeader());
|
||||
}
|
||||
|
||||
virtual const Type *getType() const { return Operands[0]->getType(); }
|
||||
|
||||
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
|
||||
Instruction *InsertPt);
|
||||
|
||||
|
||||
/// isAffine - Return true if this is an affine AddRec (i.e., it represents
|
||||
/// an expressions A+B*x where A and B are loop invariant values.
|
||||
bool isAffine() const {
|
||||
// We know that the start value is invariant. This expression is thus
|
||||
// affine iff the step is also invariant.
|
||||
return getNumOperands() == 2;
|
||||
}
|
||||
|
||||
/// isQuadratic - Return true if this is an quadratic AddRec (i.e., it
|
||||
/// represents an expressions A+B*x+C*x^2 where A, B and C are loop
|
||||
/// invariant values. This corresponds to an addrec of the form {L,+,M,+,N}
|
||||
bool isQuadratic() const {
|
||||
return getNumOperands() == 3;
|
||||
}
|
||||
|
||||
/// evaluateAtIteration - Return the value of this chain of recurrences at
|
||||
/// the specified iteration number.
|
||||
SCEVHandle evaluateAtIteration(SCEVHandle It) const;
|
||||
|
||||
/// getNumIterationsInRange - Return the number of iterations of this loop
|
||||
/// that produce values in the specified constant range. Another way of
|
||||
/// looking at this is that it returns the first iteration number where the
|
||||
/// value is not in the condition, thus computing the exit count. If the
|
||||
/// iteration count can't be computed, an instance of SCEVCouldNotCompute is
|
||||
/// returned.
|
||||
SCEVHandle getNumIterationsInRange(ConstantRange Range) const;
|
||||
|
||||
|
||||
virtual void print(std::ostream &OS) const {
|
||||
OS << "{" << *Operands[0];
|
||||
for (unsigned i = 1, e = Operands.size(); i != e; ++i)
|
||||
OS << ",+," << *Operands[i];
|
||||
OS << "}<" << L->getHeader()->getName() + ">";
|
||||
}
|
||||
|
||||
/// Methods for support type inquiry through isa, cast, and dyn_cast:
|
||||
static inline bool classof(const SCEVAddRecExpr *S) { return true; }
|
||||
static inline bool classof(const SCEV *S) {
|
||||
return S->getSCEVType() == scAddRecExpr;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// SCEVUnknown - This means that we are dealing with an entirely unknown SCEV
|
||||
// value, and only represent it as it's LLVM Value. This is the "bottom" value
|
||||
// for the analysis.
|
||||
//
|
||||
namespace {
|
||||
class SCEVUnknown;
|
||||
// SCEVUnknowns - Only allow the creation of one SCEVUnknown for any
|
||||
// particular value. Don't use a SCEVHandle here, or else the object will
|
||||
// never be deleted!
|
||||
std::map<Value*, SCEVUnknown*> SCEVUnknowns;
|
||||
|
||||
class SCEVUnknown : public SCEV {
|
||||
Value *V;
|
||||
SCEVUnknown(Value *v) : SCEV(scUnknown), V(v) {}
|
||||
|
||||
protected:
|
||||
~SCEVUnknown() { SCEVUnknowns.erase(V); }
|
||||
public:
|
||||
/// get method - For SCEVUnknown, this just gets and returns a new
|
||||
/// SCEVUnknown.
|
||||
static SCEVHandle get(Value *V) {
|
||||
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
|
||||
return SCEVConstant::get(CI);
|
||||
SCEVUnknown *&Result = SCEVUnknowns[V];
|
||||
if (Result == 0) Result = new SCEVUnknown(V);
|
||||
return Result;
|
||||
}
|
||||
|
||||
Value *getValue() const { return V; }
|
||||
|
||||
Value *expandCodeFor(ScalarEvolutionRewriter &SER,
|
||||
Instruction *InsertPt) {
|
||||
return V;
|
||||
}
|
||||
|
||||
virtual bool isLoopInvariant(const Loop *L) const {
|
||||
// All non-instruction values are loop invariant. All instructions are
|
||||
// loop invariant if they are not contained in the specified loop.
|
||||
if (Instruction *I = dyn_cast<Instruction>(V))
|
||||
return !L->contains(I->getParent());
|
||||
return true;
|
||||
}
|
||||
|
||||
virtual bool hasComputableLoopEvolution(const Loop *QL) const {
|
||||
return false; // not computable
|
||||
}
|
||||
|
||||
virtual const Type *getType() const { return V->getType(); }
|
||||
|
||||
virtual void print(std::ostream &OS) const {
|
||||
WriteAsOperand(OS, V, false);
|
||||
}
|
||||
|
||||
/// Methods for support type inquiry through isa, cast, and dyn_cast:
|
||||
static inline bool classof(const SCEVUnknown *S) { return true; }
|
||||
static inline bool classof(const SCEV *S) {
|
||||
return S->getSCEVType() == scUnknown;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// Simple SCEV method implementations
|
||||
@ -1375,6 +956,14 @@ SCEVHandle SCEVAddRecExpr::get(std::vector<SCEVHandle> &Operands,
|
||||
return Result;
|
||||
}
|
||||
|
||||
SCEVHandle SCEVUnknown::get(Value *V) {
|
||||
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
|
||||
return SCEVConstant::get(CI);
|
||||
SCEVUnknown *&Result = SCEVUnknowns[V];
|
||||
if (Result == 0) Result = new SCEVUnknown(V);
|
||||
return Result;
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// Non-trivial closed-form SCEV Expanders
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user