1 files changed, 43 insertions, 0 deletions
diff --git a/include/llvm/Support/KnownBits.h b/include/llvm/Support/KnownBits.h
new file mode 100644
index 0000000000000..08d4dedd0ac82
--- /dev/null
+++ b/include/llvm/Support/KnownBits.h
@@ -0,0 +1,43 @@
+//===- llvm/Support/KnownBits.h - Stores known zeros/ones -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a class for representing known zeros and ones used by
+// computeKnownBits.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_KNOWNBITS_H
+#define LLVM_SUPPORT_KNOWNBITS_H
+
+#include "llvm/ADT/APInt.h"
+
+namespace llvm {
+
+// For now this is a simple wrapper around two APInts.
+struct KnownBits {
+  APInt Zero;
+  APInt One;
+
+  // Default construct Zero and One.
+  KnownBits() {}
+
+  /// Create a known bits object of BitWidth bits initialized to unknown.
+  KnownBits(unsigned BitWidth) : Zero(BitWidth, 0), One(BitWidth, 0) {}
+
+  /// Get the bit width of this value.
+  unsigned getBitWidth() const {
+    assert(Zero.getBitWidth() == One.getBitWidth() &&
+           "Zero and One should have the same width!");
+    return Zero.getBitWidth();
+  }
+};
+
+} // end namespace llvm
+
+#endif