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diff --git a/riscV/CBuiltins.ml b/riscV/CBuiltins.ml
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+(* *********************************************************************)
+(*                                                                     *)
+(*              The Compcert verified compiler                         *)
+(*                                                                     *)
+(*          Xavier Leroy, INRIA Paris-Rocquencourt                     *)
+(*                                                                     *)
+(*  Copyright Institut National de Recherche en Informatique et en     *)
+(*  Automatique.  All rights reserved.  This file is distributed       *)
+(*  under the terms of the GNU General Public License as published by  *)
+(*  the Free Software Foundation, either version 2 of the License, or  *)
+(*  (at your option) any later version.  This file is also distributed *)
+(*  under the terms of the INRIA Non-Commercial License Agreement.     *)
+(*                                                                     *)
+(* *********************************************************************)
+
+(* Processor-dependent builtin C functions *)
+
+open C
+
+let builtins = {
+  Builtins.typedefs = [
+    "__builtin_va_list", TPtr(TVoid [], [])
+  ];
+  Builtins.functions = [
+    (* Synchronization *)
+    "__builtin_fence",
+      (TVoid [], [], false);
+    (* Integer arithmetic *)
+    "__builtin_bswap",
+      (TInt(IUInt, []), [TInt(IUInt, [])], false);
+    "__builtin_bswap64",
+      (TInt(IULongLong, []), [TInt(IULongLong, [])], false);
+    "__builtin_bswap32",
+      (TInt(IUInt, []), [TInt(IUInt, [])], false);
+    "__builtin_bswap16",
+      (TInt(IUShort, []), [TInt(IUShort, [])], false);
+    (* Float arithmetic *)
+    "__builtin_fmadd",
+      (TFloat(FDouble, []),
+       [TFloat(FDouble, []); TFloat(FDouble, []); TFloat(FDouble, [])],
+       false);
+    "__builtin_fmsub",
+      (TFloat(FDouble, []),
+       [TFloat(FDouble, []); TFloat(FDouble, []); TFloat(FDouble, [])],
+       false);
+    "__builtin_fnmadd",
+      (TFloat(FDouble, []),
+       [TFloat(FDouble, []); TFloat(FDouble, []); TFloat(FDouble, [])],
+       false);
+    "__builtin_fnmsub",
+      (TFloat(FDouble, []),
+       [TFloat(FDouble, []); TFloat(FDouble, []); TFloat(FDouble, [])],
+       false);
+    "__builtin_fsqrt",
+      (TFloat(FDouble, []), [TFloat(FDouble, [])], false);
+    "__builtin_fmax",
+      (TFloat(FDouble, []), [TFloat(FDouble, []); TFloat(FDouble, [])], false);
+    "__builtin_fmin",
+      (TFloat(FDouble, []), [TFloat(FDouble, []); TFloat(FDouble, [])], false);
+  ]
+}
+
+let va_list_type = TPtr(TVoid [], [])  (* to check! *)
+let size_va_list = if Archi.ptr64 then 8 else 4
+let va_list_scalar = true
+
+(* Expand memory references inside extended asm statements.  Used in C2C. *)
+
+let asm_mem_argument arg = Printf.sprintf "0(%s)" arg