Instcombine: destructor loads of structs that do not contains padding

[oota-llvm.git] / include / llvm / IR / DataLayout.h

diff --git a/include/llvm/IR/DataLayout.h b/include/llvm/IR/DataLayout.h
index 892d6c9936c03958a86a8c58c7ba4a283799eff4..19a3a6661feb668955c7d7ad80a3452c08b6ef9e 100644 (file)
--- a/include/llvm/IR/DataLayout.h
+++ b/include/llvm/IR/DataLayout.h
@@ -475,7 +475,8 @@ inline LLVMTargetDataRef wrap(const DataLayout *P) {
 class StructLayout {
   uint64_t StructSize;
   unsigned StructAlignment;
-  unsigned NumElements;
+  bool IsPadded : 1;
+  unsigned NumElements : 31;
   uint64_t MemberOffsets[1]; // variable sized array!
 public:
   uint64_t getSizeInBytes() const { return StructSize; }
@@ -484,6 +485,10 @@ public:
 
   unsigned getAlignment() const { return StructAlignment; }
 
+  /// Returns whether the struct has padding or not between its fields.
+  /// NB: Padding in nested element is not taken into account.
+  bool hasPadding() const { return IsPadded; }
+
   /// \brief Given a valid byte offset into the structure, returns the structure
   /// index that contains it.
   unsigned getElementContainingOffset(uint64_t Offset) const;