1 files changed, 89 insertions, 0 deletions
diff --git a/contrib/llvm/include/llvm/MC/LaneBitmask.h b/contrib/llvm/include/llvm/MC/LaneBitmask.h
new file mode 100644
index 0000000..89e6092
--- /dev/null
+++ b/contrib/llvm/include/llvm/MC/LaneBitmask.h
@@ -0,0 +1,89 @@
+//===-- llvm/MC/LaneBitmask.h -----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// A common definition of LaneBitmask for use in TableGen and CodeGen.
+///
+/// A lane mask is a bitmask representing the covering of a register with
+/// sub-registers.
+///
+/// This is typically used to track liveness at sub-register granularity.
+/// Lane masks for sub-register indices are similar to register units for
+/// physical registers. The individual bits in a lane mask can't be assigned
+/// any specific meaning. They can be used to check if two sub-register
+/// indices overlap.
+///
+/// Iff the target has a register such that:
+///
+///   getSubReg(Reg, A) overlaps getSubReg(Reg, B)
+///
+/// then:
+///
+///   (getSubRegIndexLaneMask(A) & getSubRegIndexLaneMask(B)) != 0
+
+#ifndef LLVM_MC_LANEBITMASK_H
+#define LLVM_MC_LANEBITMASK_H
+
+#include "llvm/Support/Format.h"
+#include "llvm/Support/Printable.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+  struct LaneBitmask {
+    // When changing the underlying type, change the format string as well.
+    typedef unsigned Type;
+    enum : unsigned { BitWidth = 8*sizeof(Type) };
+    constexpr static const char *const FormatStr = "%08X";
+
+    constexpr LaneBitmask() = default;
+    explicit constexpr LaneBitmask(Type V) : Mask(V) {}
+
+    constexpr bool operator== (LaneBitmask M) const { return Mask == M.Mask; }
+    constexpr bool operator!= (LaneBitmask M) const { return Mask != M.Mask; }
+    constexpr bool operator< (LaneBitmask M)  const { return Mask < M.Mask; }
+    constexpr bool none() const { return Mask == 0; }
+    constexpr bool any()  const { return Mask != 0; }
+    constexpr bool all()  const { return ~Mask == 0; }
+
+    constexpr LaneBitmask operator~() const {
+      return LaneBitmask(~Mask);
+    }
+    constexpr LaneBitmask operator|(LaneBitmask M) const {
+      return LaneBitmask(Mask | M.Mask);
+    }
+    constexpr LaneBitmask operator&(LaneBitmask M) const {
+      return LaneBitmask(Mask & M.Mask);
+    }
+    LaneBitmask &operator|=(LaneBitmask M) {
+      Mask |= M.Mask;
+      return *this;
+    }
+    LaneBitmask &operator&=(LaneBitmask M) {
+      Mask &= M.Mask;
+      return *this;
+    }
+
+    constexpr Type getAsInteger() const { return Mask; }
+
+    static LaneBitmask getNone() { return LaneBitmask(0); }
+    static LaneBitmask getAll()  { return ~LaneBitmask(0); }
+
+  private:
+    Type Mask = 0;
+  };
+
+  /// Create Printable object to print LaneBitmasks on a \ref raw_ostream.
+  static LLVM_ATTRIBUTE_UNUSED Printable PrintLaneMask(LaneBitmask LaneMask) {
+    return Printable([LaneMask](raw_ostream &OS) {
+      OS << format(LaneBitmask::FormatStr, LaneMask.getAsInteger());
+    });
+  }
+}
+
+#endif // LLVM_MC_LANEBITMASK_H