(* *********************************************************************)
(*                                                                     *)
(*              The Compcert verified compiler                         *)
(*                                                                     *)
(*                Xavier Leroy, INRIA Paris                            *)
(*                Jacques-Henri Jourdan, 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.     *)
(*                                                                     *)
(* *********************************************************************)
(** Architecture-dependent parameters for RISC-V *)
(*From Flocq*)
Parameter ptr64 : bool.
Definition big_endian := false.
Definition align_int64 := 8%Z.
Definition align_float64 := 8%Z.
Definition splitlong := negb ptr64.
(** Section 7.3: "Except when otherwise stated, if the result of a floating-point operation is NaN, it is the canonical NaN. The canonical NaN has a positive sign and all significand bits clear except the MSB, a.k.a. the quiet bit." Exceptions are operations manipulating signs. *)
Definition default_nan_64 := (false, iter_nat 51 _ xO xH).
Definition default_nan_32 := (false, iter_nat 22 _ xO xH).
Definition choose_nan_64 (l: list (bool * positive)) : bool * positive :=
default_nan_64.
Definition choose_nan_32 (l: list (bool * positive)) : bool * positive :=
default_nan_32.

Lemma choose_nan_64_idem: forall n,
choose_nan_64 (n :: n :: nil) = choose_nan_64 (n :: nil).