Change MachineMemOperand's alignment value to be the alignment of

the base pointer, without the offset. This matches MemSDNode's
new alignment behavior, and holds more interesting information.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82473 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineMemOperand.h

@@ -16,6 +16,8 @@
 #ifndef LLVM_CODEGEN_MACHINEMEMOPERAND_H
 #define LLVM_CODEGEN_MACHINEMEMOPERAND_H
 
+#include "llvm/Support/MathExtras.h"
+
 namespace llvm {
 
 class Value;
@@ -47,9 +49,9 @@ public:
   };
 
   /// MachineMemOperand - Construct an MachineMemOperand object with the
-  /// specified address Value, flags, offset, size, and alignment.
+  /// specified address Value, flags, offset, size, and base alignment.
   MachineMemOperand(const Value *v, unsigned int f, int64_t o, uint64_t s,
-                    unsigned int a);
+                    unsigned int base_alignment);
 
   /// getValue - Return the base address of the memory access. This may either
   /// be a normal LLVM IR Value, or one of the special values used in CodeGen.
@@ -72,8 +74,14 @@ public:
   uint64_t getSize() const { return Size; }
 
   /// getAlignment - Return the minimum known alignment in bytes of the
-  /// memory reference.
-  unsigned int getAlignment() const { return (1u << (Flags >> 3)) >> 1; }
+  /// actual memory reference.
+  uint64_t getAlignment() const {
+    return MinAlign(getBaseAlignment(), getOffset());
+  }
+
+  /// getBaseAlignment - Return the minimum known alignment in bytes of the
+  /// base address, without the offset.
+  uint64_t getBaseAlignment() const { return (1u << (Flags >> 3)) >> 1; }
 
   bool isLoad() const { return Flags & MOLoad; }
   bool isStore() const { return Flags & MOStore; }