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diff --git a/powerpc/CBuiltins.ml b/powerpc/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 Cparser
+open C
+
+let builtins = {
+  Builtins.typedefs = [];
+  Builtins.functions = [
+    (* Integer arithmetic *)
+    "__builtin_mulhw",
+      (TInt(IInt, []), [TInt(IInt, []); TInt(IInt, [])], false);
+    "__builtin_mulhwu",
+      (TInt(IUInt, []), [TInt(IUInt, []); TInt(IUInt, [])], false);
+    "__builtin_cntlzw",
+      (TInt(IUInt, []), [TInt(IUInt, [])], 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_fabs",
+      (TFloat(FDouble, []), [TFloat(FDouble, [])], false);
+    "__builtin_fsqrt",
+      (TFloat(FDouble, []), [TFloat(FDouble, [])], false);
+    "__builtin_frsqrte",
+      (TFloat(FDouble, []), [TFloat(FDouble, [])], false);
+    "__builtin_fres",
+      (TFloat(FFloat, []), [TFloat(FFloat, [])], false);
+    "__builtin_fsel",
+      (TFloat(FDouble, []), 
+       [TFloat(FDouble, []); TFloat(FDouble, []); TFloat(FDouble, [])],
+       false);
+    (* Memory accesses *)
+    "__builtin_read_int16_reversed",
+      (TInt(IUShort, []), [TPtr(TInt(IUShort, []), [])], false);
+    "__builtin_read_int32_reversed",
+      (TInt(IUInt, []), [TPtr(TInt(IUInt, []), [])], false);
+    "__builtin_write_int16_reversed",
+      (TVoid [], [TPtr(TInt(IUShort, []), []); TInt(IUShort, [])], false);
+    "__builtin_write_int32_reversed",
+      (TVoid [], [TPtr(TInt(IUInt, []), []); TInt(IUInt, [])], false);
+    (* Synchronization *)
+    "__builtin_eieio",
+      (TVoid [], [], false);
+    "__builtin_sync",
+      (TVoid [], [], false);
+    "__builtin_isync",
+      (TVoid [], [], false)
+  ]
+}