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diff --git a/clang-r353983e/include/llvm/Support/CodeGen.h b/clang-r353983e/include/llvm/Support/CodeGen.h
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+++ b/clang-r353983e/include/llvm/Support/CodeGen.h
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+//===-- llvm/Support/CodeGen.h - CodeGen Concepts ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file define some types which define code generation concepts. For
+// example, relocation model.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_CODEGEN_H
+#define LLVM_SUPPORT_CODEGEN_H
+
+namespace llvm {
+
+  // Relocation model types.
+  namespace Reloc {
+  enum Model { Static, PIC_, DynamicNoPIC, ROPI, RWPI, ROPI_RWPI };
+  }
+
+  // Code model types.
+  namespace CodeModel {
+    // Sync changes with CodeGenCWrappers.h.
+  enum Model { Tiny, Small, Kernel, Medium, Large };
+  }
+
+  namespace PICLevel {
+    // This is used to map -fpic/-fPIC.
+    enum Level { NotPIC=0, SmallPIC=1, BigPIC=2 };
+  }
+
+  namespace PIELevel {
+    enum Level { Default=0, Small=1, Large=2 };
+  }
+
+  // TLS models.
+  namespace TLSModel {
+    enum Model {
+      GeneralDynamic,
+      LocalDynamic,
+      InitialExec,
+      LocalExec
+    };
+  }
+
+  // Code generation optimization level.
+  namespace CodeGenOpt {
+    enum Level {
+      None = 0,      // -O0
+      Less = 1,      // -O1
+      Default = 2,   // -O2, -Os
+      Aggressive = 3 // -O3
+    };
+  }
+
+  // Specify effect of frame pointer elimination optimization.
+  namespace FramePointer {
+    enum FP {All, NonLeaf, None};
+  }
+
+}  // end llvm namespace
+
+#endif