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(*
* Vericert: Verified high-level synthesis.
* Copyright (C) 2021 ___ ___ <___@______.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*)
Require Import compcert.backend.Registers.
Require Import compcert.lib.Maps.
Require Import vericert.common.Vericertlib.
#[local] Open Scope positive.
Record divider (signed: bool) : Type :=
mk_divider {
div_stages: positive;
div_size: positive;
div_numer: reg;
div_denom: reg;
div_quot: reg;
div_rem: reg;
div_ordering: (div_numer < div_denom
/\ div_denom < div_quot
/\ div_quot < div_rem)
}.
Arguments div_stages [signed].
Arguments div_size [signed].
Arguments div_numer [signed].
Arguments div_denom [signed].
Arguments div_quot [signed].
Arguments div_rem [signed].
Record ram := mk_ram {
ram_size: nat;
ram_mem: reg;
ram_en: reg;
ram_u_en: reg;
ram_addr: reg;
ram_wr_en: reg;
ram_d_in: reg;
ram_d_out: reg;
ram_ordering: (ram_addr < ram_en
/\ ram_en < ram_d_in
/\ ram_d_in < ram_d_out
/\ ram_d_out < ram_wr_en
/\ ram_wr_en < ram_u_en)
}.
Inductive funct_unit: Type :=
| SignedDiv: divider true -> funct_unit
| UnsignedDiv: divider false -> funct_unit
| Ram: ram -> funct_unit.
Definition funct_units := PTree.t funct_unit.
Record arch := mk_arch {
arch_div: list positive;
arch_sdiv: list positive;
arch_ram: list positive;
}.
Record resources := mk_resources {
res_funct_units: funct_units;
res_arch: arch;
}.
Definition initial_funct_units: funct_units := PTree.empty _.
Definition initial_arch := mk_arch nil nil nil.
Definition initial_resources :=
mk_resources initial_funct_units initial_arch.
Definition funct_unit_stages (f: funct_unit) : positive :=
match f with
| SignedDiv d => div_stages d
| UnsignedDiv d => div_stages d
| _ => 1
end.
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