Module Archi

Architecture-dependent parameters for RISC-V

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

Parameter ptr64 : bool.
Definition canary64 := ptr64.

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.

Definition float_conversion_default_nan := true.

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
              float_conversion_default_nan.

Whether to generate position-independent code or not

Parameter pic_code: unit -> bool.

Definition has_notrap_loads := false.
Definition has_mulhu := true.
Definition has_mulhs := true.
Definition has_mullhu := true.
Definition has_mullhs := true.