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teach PointerLikeTypeTraits that all pointers to pointers may only be 4-byte aligned.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68147 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-03-31 21:28:39 +00:00
parent bdd376ccb2
commit f385167b85
2 changed files with 14 additions and 11 deletions
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14
include/llvm/Support/PointerLikeTypeTraits.h
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@ -58,6 +58,20 @@ public:
enum { NumLowBitsAvailable = 3 };
};
// Pointers to pointers are only 4-byte aligned on 32-bit systems.
template<typename T>
class PointerLikeTypeTraits<T**> {
public:
static inline void *getAsVoidPointer(T** P) { return P; }
static inline T **getFromVoidPointer(void *P) {
return static_cast<T**>(P);
}
enum { NumLowBitsAvailable = 2 };
};
// Provide PointerLikeTypeTraits for uintptr_t.
template<>
class PointerLikeTypeTraits<uintptr_t> {

11
include/llvm/Use.h
View File

@ -29,17 +29,6 @@ class Use;
/// Tag - generic tag type for (at least 32 bit) pointers
enum Tag { noTag, tagOne, tagTwo, tagThree };
// Use** is only 4-byte aligned.
template<>
class PointerLikeTypeTraits<Use**> {
public:
static inline void *getAsVoidPointer(Use** P) { return P; }
static inline Use **getFromVoidPointer(void *P) {
return static_cast<Use**>(P);
}
enum { NumLowBitsAvailable = 2 };
};
//===----------------------------------------------------------------------===//
// Use Class
//===----------------------------------------------------------------------===//