asmcomp/mips/selection.ml

   1 (***********************************************************************)
   2 (*                                                                     *)
   3 (*                           Objective Caml                            *)
   4 (*                                                                     *)
   5 (*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
   6 (*                                                                     *)
   7 (*  Copyright 1997 Institut National de Recherche en Informatique et   *)
   8 (*  en Automatique.  All rights reserved.  This file is distributed    *)
   9 (*  under the terms of the Q Public License version 1.0.               *)
  10 (*                                                                     *)
  11 (***********************************************************************)
  12
  13 (* $Id$ *)
  14
  15 (* Instruction selection for the Mips processor *)
  16
  17 open Misc
  18 open Cmm
  19 open Reg
  20 open Arch
  21 open Mach
  22
  23 class selector = object
  24
  25 inherit Selectgen.selector_generic
  26
  27 method is_immediate (n : int) = true
  28
  29 method select_addressing = function
  30     Cconst_symbol s ->
  31       (Ibased(s, 0), Ctuple [])
  32   | Cop(Cadda, [Cconst_symbol s; Cconst_int n]) ->
  33       (Ibased(s, n), Ctuple [])
  34   | Cop(Cadda, [arg; Cconst_int n]) ->
  35       (Iindexed n, arg)
  36   | Cop(Cadda, [arg1; Cop(Caddi, [arg2; Cconst_int n])]) ->
  37       (Iindexed n, Cop(Cadda, [arg1; arg2]))
  38   | arg ->
  39       (Iindexed 0, arg)
  40
  41 end
  42
  43 let fundecl f = (new selector)#emit_fundecl f