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diff --git a/x86/CBuiltins.ml b/x86/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 (va_list_type, va_list_scalar, size_va_list) =
+  if Archi.ptr64 then
+    (* Actually a struct passed by reference; equivalent to 3 64-bit words *)
+    (TArray(TInt(IULong, []), Some 3L, []), false, 3*8)
+  else
+    (* Just a pointer *)
+    (TPtr(TVoid [], []), true, 4)
+
+let builtins = {
+  Builtins.typedefs = [
+    "__builtin_va_list", va_list_type;
+  ];
+  Builtins.functions = [
+    (* 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);
+    "__builtin_clz",
+      (TInt(IInt, []), [TInt(IUInt, [])], false);
+    "__builtin_clzl",
+      (TInt(IInt, []), [TInt(IULong, [])], false);
+    "__builtin_clzll",
+      (TInt(IInt, []), [TInt(IULongLong, [])], false);
+    "__builtin_ctz",
+      (TInt(IInt, []), [TInt(IUInt, [])], false);
+    "__builtin_ctzl",
+      (TInt(IInt, []), [TInt(IULong, [])], false);
+    "__builtin_ctzll",
+      (TInt(IInt, []), [TInt(IULongLong, [])], false);
+    (* Float arithmetic *)
+    "__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);
+    "__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);
+    (* Memory accesses *)
+    "__builtin_read16_reversed",
+      (TInt(IUShort, []), [TPtr(TInt(IUShort, [AConst]), [])], false);
+    "__builtin_read32_reversed",
+      (TInt(IUInt, []), [TPtr(TInt(IUInt, [AConst]), [])], false);
+    "__builtin_write16_reversed",
+      (TVoid [], [TPtr(TInt(IUShort, []), []); TInt(IUShort, [])], false);
+    "__builtin_write32_reversed",
+      (TVoid [], [TPtr(TInt(IUInt, []), []); TInt(IUInt, [])], false);
+    (* no operation *)
+    "__builtin_nop",
+      (TVoid [], [], false);
+  ]
+}
+
+(* Expand memory references inside extended asm statements.  Used in C2C. *)
+
+let asm_mem_argument arg = Printf.sprintf "0(%s)" arg