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|
# 2 "asmcomp/riscv/arch.ml"
(**************************************************************************)
(* *)
(* OCaml *)
(* *)
(* Nicolas Ojeda Bar <n.oje.bar@gmail.com> *)
(* *)
(* Copyright 2016 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 version 2.1, with the *)
(* special exception on linking described in the file LICENSE. *)
(* *)
(**************************************************************************)
(* Specific operations for the RISC-V processor *)
open Format
(* Machine-specific command-line options *)
let command_line_options = []
(* Specific operations *)
type specific_operation =
| Imultaddf of bool (* multiply, optionally negate, and add *)
| Imultsubf of bool (* multiply, optionally negate, and subtract *)
(* Addressing modes *)
type addressing_mode =
| Iindexed of int (* reg + displ *)
let is_immediate n =
(n <= 0x7FF) && (n >= -0x800)
(* Sizes, endianness *)
let big_endian = false
let size_addr = 8
let size_int = size_addr
let size_float = 8
let allow_unaligned_access = false
(* Behavior of division *)
let division_crashes_on_overflow = false
(* Operations on addressing modes *)
let identity_addressing = Iindexed 0
let offset_addressing addr delta =
match addr with
| Iindexed n -> Iindexed(n + delta)
(* Printing operations and addressing modes *)
let print_addressing printreg addr ppf arg =
match addr with
| Iindexed n ->
let idx = if n <> 0 then Printf.sprintf " + %i" n else "" in
fprintf ppf "%a%s" printreg arg.(0) idx
let print_specific_operation printreg op ppf arg =
match op with
| Imultaddf false ->
fprintf ppf "%a *f %a +f %a"
printreg arg.(0) printreg arg.(1) printreg arg.(2)
| Imultaddf true ->
fprintf ppf "-f (%a *f %a +f %a)"
printreg arg.(0) printreg arg.(1) printreg arg.(2)
| Imultsubf false ->
fprintf ppf "%a *f %a -f %a"
printreg arg.(0) printreg arg.(1) printreg arg.(2)
| Imultsubf true ->
fprintf ppf "-f (%a *f %a -f %a)"
printreg arg.(0) printreg arg.(1) printreg arg.(2)
(* Specific operations that are pure *)
let operation_is_pure _ = true
(* Specific operations that can raise *)
let operation_can_raise _ = false
|
