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Specialize DenseMapInfo for SCEVHandle, so that SCEVHandles can be

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used as keys in DenseMaps.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73360 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-06-14 22:55:07 +00:00
parent 7f7c4366ca
commit 444f49150d
1 changed files with 28 additions and 0 deletions
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28
include/llvm/Analysis/ScalarEvolution.h
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@ -25,6 +25,7 @@
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/ValueHandle.h"
#include "llvm/ADT/DenseMap.h"
#include <iosfwd>
namespace llvm {
@ -34,6 +35,7 @@ namespace llvm {
class SCEVHandle;
class ScalarEvolution;
class TargetData;
template<> struct DenseMapInfo<SCEVHandle>;
/// SCEV - This class represents an analyzed expression in the program. These
/// are reference-counted opaque objects that the client is not allowed to
@ -44,6 +46,7 @@ namespace llvm {
mutable unsigned RefCount;
friend class SCEVHandle;
friend class DenseMapInfo<SCEVHandle>;
void addRef() const { ++RefCount; }
void dropRef() const {
if (--RefCount == 0)
@ -197,6 +200,31 @@ namespace llvm {
template<> struct simplify_type<SCEVHandle>
: public simplify_type<const SCEVHandle> {};
// Specialize DenseMapInfo for SCEVHandle so that SCEVHandle may be used
// as a key in DenseMaps.
template<>
struct DenseMapInfo<SCEVHandle> {
static inline SCEVHandle getEmptyKey() {
static SCEVCouldNotCompute Empty;
if (Empty.RefCount == 0)
Empty.addRef();
return &Empty;
}
static inline SCEVHandle getTombstoneKey() {
static SCEVCouldNotCompute Tombstone;
if (Tombstone.RefCount == 0)
Tombstone.addRef();
return &Tombstone;
}
static unsigned getHashValue(const SCEVHandle &Val) {
return DenseMapInfo<const SCEV *>::getHashValue(Val);
}
static bool isEqual(const SCEVHandle &LHS, const SCEVHandle &RHS) {
return LHS == RHS;
}
static bool isPod() { return false; }
};
/// ScalarEvolution - This class is the main scalar evolution driver. Because
/// client code (intentionally) can't do much with the SCEV objects directly,
/// they must ask this class for services.