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PackedVector: Make the BitVector implementation configurable.

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llvm-svn: 164826
This commit is contained in:
Benjamin Kramer 2012-09-28 16:40:29 +00:00
parent 518ed57959
commit bfbf4015c4
1 changed files with 14 additions and 13 deletions
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27
include/llvm/ADT/PackedVector.h
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@ -19,32 +19,32 @@
namespace llvm {
template <typename T, unsigned BitNum, bool isSigned>
template <typename T, unsigned BitNum, typename BitVectorTy, bool isSigned>
class PackedVectorBase;
// This won't be necessary if we can specialize members without specializing
// the parent template.
template <typename T, unsigned BitNum>
class PackedVectorBase<T, BitNum, false> {
template <typename T, unsigned BitNum, typename BitVectorTy>
class PackedVectorBase<T, BitNum, BitVectorTy, false> {
protected:
static T getValue(const llvm::BitVector &Bits, unsigned Idx) {
static T getValue(const BitVectorTy &Bits, unsigned Idx) {
T val = T();
for (unsigned i = 0; i != BitNum; ++i)
val = T(val | ((Bits[(Idx << (BitNum-1)) + i] ? 1UL : 0UL) << i));
return val;
}
static void setValue(llvm::BitVector &Bits, unsigned Idx, T val) {
static void setValue(BitVectorTy &Bits, unsigned Idx, T val) {
assert((val >> BitNum) == 0 && "value is too big");
for (unsigned i = 0; i != BitNum; ++i)
Bits[(Idx << (BitNum-1)) + i] = val & (T(1) << i);
}
};
template <typename T, unsigned BitNum>
class PackedVectorBase<T, BitNum, true> {
template <typename T, unsigned BitNum, typename BitVectorTy>
class PackedVectorBase<T, BitNum, BitVectorTy, true> {
protected:
static T getValue(const llvm::BitVector &Bits, unsigned Idx) {
static T getValue(const BitVectorTy &Bits, unsigned Idx) {
T val = T();
for (unsigned i = 0; i != BitNum-1; ++i)
val = T(val | ((Bits[(Idx << (BitNum-1)) + i] ? 1UL : 0UL) << i));
@ -53,7 +53,7 @@ protected:
return val;
}
static void setValue(llvm::BitVector &Bits, unsigned Idx, T val) {
static void setValue(BitVectorTy &Bits, unsigned Idx, T val) {
if (val < 0) {
val = ~val;
Bits.set((Idx << (BitNum-1)) + BitNum-1);
@ -71,11 +71,12 @@ protected:
/// @endcode
/// will create a vector accepting values -2, -1, 0, 1. Any other value will hit
/// an assertion.
template <typename T, unsigned BitNum>
class PackedVector : public PackedVectorBase<T, BitNum,
template <typename T, unsigned BitNum, typename BitVectorTy = BitVector>
class PackedVector : public PackedVectorBase<T, BitNum, BitVectorTy,
std::numeric_limits<T>::is_signed> {
llvm::BitVector Bits;
typedef PackedVectorBase<T, BitNum, std::numeric_limits<T>::is_signed> base;
BitVectorTy Bits;
typedef PackedVectorBase<T, BitNum, BitVectorTy,
std::numeric_limits<T>::is_signed> base;
public:
class reference {