(* *********************************************************************)
(*                                                                     *)
(*              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 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.                            *)
(*                                                                     *)
(* *********************************************************************)

(** Architecture-dependent parameters for RISC-V *)

From Flocq Require Import Binary Bits.
Require Import ZArith List.

Parameter ptr64 : bool.

Definition big_endian := false.

Definition align_int64 := 8%Z.
Definition align_float64 := 8%Z.

Definition splitlong := negb ptr64.

Lemma splitlong_ptr32: splitlong = true -> ptr64 = false.
Proof.
  unfold splitlong. destruct ptr64; simpl; congruence. 
Qed.

(** 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).
Proof. auto. Qed.

Lemma choose_nan_32_idem: forall n,
  choose_nan_32 (n :: n :: nil) = choose_nan_32 (n :: nil).
Proof. auto. Qed.

Definition fma_order {A: Type} (x y z: A) := (x, y, z).

Definition fma_invalid_mul_is_nan := false.

Definition float_of_single_preserves_sNaN := false.

Global Opaque ptr64 big_endian splitlong
              default_nan_64 choose_nan_64
              default_nan_32 choose_nan_32
              fma_order fma_invalid_mul_is_nan
              float_of_single_preserves_sNaN.

(** Whether to generate position-independent code or not *)

Parameter pic_code: unit -> bool.

Definition has_notrap_loads := false.