From f385167b85abf9cb63a0bec94732d7185ee74e36 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 31 Mar 2009 21:28:39 +0000
Subject: [PATCH] teach PointerLikeTypeTraits that all pointers to pointers may
 only be 4-byte aligned.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68147 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/PointerLikeTypeTraits.h | 14 ++++++++++++++
 include/llvm/Use.h                           | 11 -----------
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/include/llvm/Support/PointerLikeTypeTraits.h b/include/llvm/Support/PointerLikeTypeTraits.h
index c5f79ccb835..226dacf3611 100644
--- a/include/llvm/Support/PointerLikeTypeTraits.h
+++ b/include/llvm/Support/PointerLikeTypeTraits.h
@@ -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> {
diff --git a/include/llvm/Use.h b/include/llvm/Use.h
index 53df699e703..32cdd1b95dd 100644
--- a/include/llvm/Use.h
+++ b/include/llvm/Use.h
@@ -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
 //===----------------------------------------------------------------------===//