(* *********************************************************************)
(*                                                                     *)
(*              The Compcert verified compiler                         *)
(*                                                                     *)
(*          Xavier Leroy, Collège de France and Inria Paris            *)
(*                                                                     *)
(*  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.     *)
(*                                                                     *)
(* *********************************************************************)

(** Platform-specific built-in functions *)

Require Import String Coqlib.
Require Import AST Integers Floats Values.
Require Import Builtins0.

Inductive platform_builtin : Type :=
  | BI_fmin
  | BI_fmax.

Local Open Scope string_scope.

Definition platform_builtin_table : list (string * platform_builtin) :=
     ("__builtin_fmin", BI_fmin)
  :: ("__builtin_fmax", BI_fmax)
  :: nil.

Definition platform_builtin_sig (b: platform_builtin) : signature :=
  match b with
  | BI_fmin | BI_fmax =>
      mksignature (Tfloat :: Tfloat :: nil) Tfloat cc_default
  end.

Definition platform_builtin_sem (b: platform_builtin) : builtin_sem (sig_res (platform_builtin_sig b)) :=
  match b with
  | BI_fmin =>
      mkbuiltin_n2t Tfloat Tfloat Tfloat
        (fun f1 f2 => match Float.compare f1 f2 with
                      | Some Eq | Some Lt => f1
                      | Some Gt | None => f2
                      end)
  | BI_fmax =>
      mkbuiltin_n2t Tfloat Tfloat Tfloat
        (fun f1 f2 => match Float.compare f1 f2 with
                      | Some Eq | Some Gt => f1
                      | Some Lt | None => f2
                      end)
  end.