85 lines
2.7 KiB
OCaml
85 lines
2.7 KiB
OCaml
(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Nicolas Ojeda Bar <n.oje.bar@gmail.com> *)
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(* *)
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(* Copyright 2016 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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(* Specific operations for the RISC-V processor *)
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open Format
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(* Machine-specific command-line options *)
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let command_line_options = []
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(* Specific operations *)
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type specific_operation =
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| Imultaddf of bool (* multiply, optionally negate, and add *)
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| Imultsubf of bool (* multiply, optionally negate, and subtract *)
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(* Addressing modes *)
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type addressing_mode =
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| Iindexed of int (* reg + displ *)
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let is_immediate n =
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(n <= 0x7FF) && (n >= -0x800)
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(* Sizes, endianness *)
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let big_endian = false
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let size_addr = 8
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let size_int = size_addr
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let size_float = 8
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let allow_unaligned_access = false
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(* Behavior of division *)
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let division_crashes_on_overflow = false
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(* Operations on addressing modes *)
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let identity_addressing = Iindexed 0
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let offset_addressing addr delta =
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match addr with
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| Iindexed n -> Iindexed(n + delta)
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let num_args_addressing = function
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| Iindexed _ -> 1
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(* Printing operations and addressing modes *)
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let print_addressing printreg addr ppf arg =
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match addr with
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| Iindexed n ->
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let idx = if n <> 0 then Printf.sprintf " + %i" n else "" in
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fprintf ppf "%a%s" printreg arg.(0) idx
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let print_specific_operation printreg op ppf arg =
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match op with
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| Imultaddf false ->
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fprintf ppf "%a *f %a +f %a"
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printreg arg.(0) printreg arg.(1) printreg arg.(2)
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| Imultaddf true ->
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fprintf ppf "-f (%a *f %a +f %a)"
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printreg arg.(0) printreg arg.(1) printreg arg.(2)
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| Imultsubf false ->
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fprintf ppf "%a *f %a -f %a"
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printreg arg.(0) printreg arg.(1) printreg arg.(2)
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| Imultsubf true ->
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fprintf ppf "-f (%a *f %a -f %a)"
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printreg arg.(0) printreg arg.(1) printreg arg.(2)
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