(* *********************************************************************)
(*                                                                     *)
(*              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 Lesser General Public License as        *)
(*  published by the Free Software Foundation, either version 2.1 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
    if Archi.win64 then
      (* Just a pointer *)
      (TPtr(TVoid [], []), true, 8)
    else
      (* 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 = {
  builtin_typedefs = [
    "__builtin_va_list", va_list_type;
  ];
  builtin_functions = [
    (* Float arithmetic *)
    "__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);
  ]
}

(* Expand memory references inside extended asm statements.  Used in C2C. *)

let asm_mem_argument arg = Printf.sprintf "0(%s)" arg