Add long-overdue helpers for getting constants with known upper bits

llvm-svn: 23426

1 files changed, 14 insertions, 0 deletions

diff --git a/llvm/include/llvm/Constants.h b/llvm/include/llvm/Constants.h
index 4a5d0181a52..4b5d883bbfa 100644
--- a/llvm/include/llvm/Constants.h
+++ b/llvm/include/llvm/Constants.h
@@ -54,7 +54,21 @@ public:
   /// unsigned integer value.
   ///
   inline uint64_t getRawValue() const { return Val.Unsigned; }
+  
+  /// getZExtValue - Return the constant zero extended as appropriate for this
+  /// type.
+  inline uint64_t getZExtValue() const {
+    unsigned Size = getType()->getPrimitiveSizeInBits();
+    return Val.Unsigned & (~0ULL >> (64-Size));
+  }
 
+  /// getSExtValue - Return the constant sign extended as appropriate for this
+  /// type.
+  inline int64_t getSExtValue() const {
+    unsigned Size = getType()->getPrimitiveSizeInBits();
+    return (Val.Signed << (64-Size)) >> (64-Size);
+  }
+  
   /// isNullValue - Return true if this is the value that would be returned by
   /// getNullValue.
   ///