232 lines
7.9 KiB
OCaml
232 lines
7.9 KiB
OCaml
(***********************************************************************)
|
|
(* *)
|
|
(* Objective Caml *)
|
|
(* *)
|
|
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
|
|
(* *)
|
|
(* Copyright 2000 Institut National de Recherche en Informatique et *)
|
|
(* en Automatique. All rights reserved. This file is distributed *)
|
|
(* under the terms of the Q Public License version 1.0. *)
|
|
(* *)
|
|
(***********************************************************************)
|
|
|
|
(* $Id$ *)
|
|
|
|
(* Instruction selection for the AMD64 *)
|
|
|
|
open Misc
|
|
open Arch
|
|
open Proc
|
|
open Cmm
|
|
open Reg
|
|
open Mach
|
|
|
|
(* Auxiliary for recognizing addressing modes *)
|
|
|
|
type addressing_expr =
|
|
Asymbol of string
|
|
| Alinear of expression
|
|
| Aadd of expression * expression
|
|
| Ascale of expression * int
|
|
| Ascaledadd of expression * expression * int
|
|
|
|
let rec select_addr exp =
|
|
match exp with
|
|
Cconst_symbol s when not !Clflags.dlcode ->
|
|
(Asymbol s, 0)
|
|
| Cop((Caddi | Cadda), [arg; Cconst_int m]) ->
|
|
let (a, n) = select_addr arg in (a, n + m)
|
|
| Cop((Csubi | Csuba), [arg; Cconst_int m]) ->
|
|
let (a, n) = select_addr arg in (a, n - m)
|
|
| Cop((Caddi | Cadda), [Cconst_int m; arg]) ->
|
|
let (a, n) = select_addr arg in (a, n + m)
|
|
| Cop(Clsl, [arg; Cconst_int(1|2|3 as shift)]) ->
|
|
begin match select_addr arg with
|
|
(Alinear e, n) -> (Ascale(e, 1 lsl shift), n lsl shift)
|
|
| _ -> (Alinear exp, 0)
|
|
end
|
|
| Cop(Cmuli, [arg; Cconst_int(2|4|8 as mult)]) ->
|
|
begin match select_addr arg with
|
|
(Alinear e, n) -> (Ascale(e, mult), n * mult)
|
|
| _ -> (Alinear exp, 0)
|
|
end
|
|
| Cop(Cmuli, [Cconst_int(2|4|8 as mult); arg]) ->
|
|
begin match select_addr arg with
|
|
(Alinear e, n) -> (Ascale(e, mult), n * mult)
|
|
| _ -> (Alinear exp, 0)
|
|
end
|
|
| Cop((Caddi | Cadda), [arg1; arg2]) ->
|
|
begin match (select_addr arg1, select_addr arg2) with
|
|
((Alinear e1, n1), (Alinear e2, n2)) ->
|
|
(Aadd(e1, e2), n1 + n2)
|
|
| ((Alinear e1, n1), (Ascale(e2, scale), n2)) ->
|
|
(Ascaledadd(e1, e2, scale), n1 + n2)
|
|
| ((Ascale(e1, scale), n1), (Alinear e2, n2)) ->
|
|
(Ascaledadd(e2, e1, scale), n1 + n2)
|
|
| (_, (Ascale(e2, scale), n2)) ->
|
|
(Ascaledadd(arg1, e2, scale), n2)
|
|
| ((Ascale(e1, scale), n1), _) ->
|
|
(Ascaledadd(arg2, e1, scale), n1)
|
|
| _ ->
|
|
(Aadd(arg1, arg2), 0)
|
|
end
|
|
| arg ->
|
|
(Alinear arg, 0)
|
|
|
|
(* Special constraints on operand and result registers *)
|
|
|
|
exception Use_default
|
|
|
|
let rax = phys_reg 0
|
|
let rcx = phys_reg 5
|
|
let rdx = phys_reg 4
|
|
|
|
let pseudoregs_for_operation op arg res =
|
|
match op with
|
|
(* Two-address binary operations: arg.(0) and res.(0) must be the same *)
|
|
Iintop(Iadd|Isub|Imul|Iand|Ior|Ixor) | Iaddf|Isubf|Imulf|Idivf ->
|
|
([|res.(0); arg.(1)|], res)
|
|
(* One-address unary operations: arg.(0) and res.(0) must be the same *)
|
|
| Iintop_imm((Iadd|Isub|Imul|Iand|Ior|Ixor|Ilsl|Ilsr|Iasr), _)
|
|
| Iabsf | Inegf ->
|
|
(res, res)
|
|
| Ispecific(Ifloatarithmem(_,_)) ->
|
|
let arg' = Array.copy arg in
|
|
arg'.(0) <- res.(0);
|
|
(arg', res)
|
|
(* For shifts with variable shift count, second arg must be in rcx *)
|
|
| Iintop(Ilsl|Ilsr|Iasr) ->
|
|
([|res.(0); rcx|], res)
|
|
(* For div and mod, first arg must be in rax, rdx is clobbered,
|
|
and result is in rax or rdx respectively.
|
|
Keep it simple, just force second argument in rcx. *)
|
|
| Iintop(Idiv) ->
|
|
([| rax; rcx |], [| rax |])
|
|
| Iintop(Imod) ->
|
|
([| rax; rcx |], [| rdx |])
|
|
(* For div and mod with immediate operand, arg must not be in rax.
|
|
Keep it simple, force it in rdx. *)
|
|
| Iintop_imm((Idiv|Imod), _) ->
|
|
([| rdx |], [| rdx |])
|
|
(* Other instructions are regular *)
|
|
| _ -> raise Use_default
|
|
|
|
(* The selector class *)
|
|
|
|
class selector = object (self)
|
|
|
|
inherit Selectgen.selector_generic as super
|
|
|
|
method is_immediate n = n <= 0x7FFFFFFF && n >= -0x80000000
|
|
|
|
method is_immediate_natint n = n <= 0x7FFFFFFFn && n >= -0x80000000n
|
|
|
|
method select_addressing exp =
|
|
match select_addr exp with
|
|
(Asymbol s, d) ->
|
|
(Ibased(s, d), Ctuple [])
|
|
| (Alinear e, d) ->
|
|
(Iindexed d, e)
|
|
| (Aadd(e1, e2), d) ->
|
|
(Iindexed2 d, Ctuple[e1; e2])
|
|
| (Ascale(e, scale), d) ->
|
|
(Iscaled(scale, d), e)
|
|
| (Ascaledadd(e1, e2, scale), d) ->
|
|
(Iindexed2scaled(scale, d), Ctuple[e1; e2])
|
|
|
|
method select_store addr exp =
|
|
match exp with
|
|
Cconst_int n when self#is_immediate n ->
|
|
(Ispecific(Istore_int(Nativeint.of_int n, addr)), Ctuple [])
|
|
| Cconst_natint n when self#is_immediate_natint n ->
|
|
(Ispecific(Istore_int(n, addr)), Ctuple [])
|
|
| Cconst_pointer n when self#is_immediate n ->
|
|
(Ispecific(Istore_int(Nativeint.of_int n, addr)), Ctuple [])
|
|
| Cconst_natpointer n when self#is_immediate_natint n ->
|
|
(Ispecific(Istore_int(n, addr)), Ctuple [])
|
|
| Cconst_symbol s when not (!pic_code || !Clflags.dlcode) ->
|
|
(Ispecific(Istore_symbol(s, addr)), Ctuple [])
|
|
| _ ->
|
|
super#select_store addr exp
|
|
|
|
method select_operation op args =
|
|
match op with
|
|
(* Recognize the LEA instruction *)
|
|
Caddi | Cadda | Csubi | Csuba ->
|
|
begin match self#select_addressing (Cop(op, args)) with
|
|
(Iindexed d, _) -> super#select_operation op args
|
|
| (Iindexed2 0, _) -> super#select_operation op args
|
|
| (addr, arg) -> (Ispecific(Ilea addr), [arg])
|
|
end
|
|
(* Recognize (x / cst) and (x % cst) only if cst is a power of 2. *)
|
|
| Cdivi ->
|
|
begin match args with
|
|
[arg1; Cconst_int n] when self#is_immediate n
|
|
&& n = 1 lsl (Misc.log2 n) ->
|
|
(Iintop_imm(Idiv, n), [arg1])
|
|
| _ -> (Iintop Idiv, args)
|
|
end
|
|
| Cmodi ->
|
|
begin match args with
|
|
[arg1; Cconst_int n] when self#is_immediate n
|
|
&& n = 1 lsl (Misc.log2 n) ->
|
|
(Iintop_imm(Imod, n), [arg1])
|
|
| _ -> (Iintop Imod, args)
|
|
end
|
|
(* Recognize float arithmetic with memory. *)
|
|
| Caddf ->
|
|
self#select_floatarith true Iaddf Ifloatadd args
|
|
| Csubf ->
|
|
self#select_floatarith false Isubf Ifloatsub args
|
|
| Cmulf ->
|
|
self#select_floatarith true Imulf Ifloatmul args
|
|
| Cdivf ->
|
|
self#select_floatarith false Idivf Ifloatdiv args
|
|
(* Recognize store instructions *)
|
|
| Cstore Word ->
|
|
begin match args with
|
|
[loc; Cop(Caddi, [Cop(Cload _, [loc']); Cconst_int n])]
|
|
when loc = loc' && self#is_immediate n ->
|
|
let (addr, arg) = self#select_addressing loc in
|
|
(Ispecific(Ioffset_loc(n, addr)), [arg])
|
|
| _ ->
|
|
super#select_operation op args
|
|
end
|
|
| _ -> super#select_operation op args
|
|
|
|
(* Recognize float arithmetic with mem *)
|
|
|
|
method select_floatarith commutative regular_op mem_op args =
|
|
match args with
|
|
[arg1; Cop(Cload (Double|Double_u), [loc2])] ->
|
|
let (addr, arg2) = self#select_addressing loc2 in
|
|
(Ispecific(Ifloatarithmem(mem_op, addr)),
|
|
[arg1; arg2])
|
|
| [Cop(Cload (Double|Double_u), [loc1]); arg2] when commutative ->
|
|
let (addr, arg1) = self#select_addressing loc1 in
|
|
(Ispecific(Ifloatarithmem(mem_op, addr)),
|
|
[arg2; arg1])
|
|
| [arg1; arg2] ->
|
|
(regular_op, [arg1; arg2])
|
|
| _ ->
|
|
assert false
|
|
|
|
(* Deal with register constraints *)
|
|
|
|
method insert_op_debug op dbg rs rd =
|
|
try
|
|
let (rsrc, rdst) = pseudoregs_for_operation op rs rd in
|
|
self#insert_moves rs rsrc;
|
|
self#insert_debug (Iop op) dbg rsrc rdst;
|
|
self#insert_moves rdst rd;
|
|
rd
|
|
with Use_default ->
|
|
super#insert_op_debug op dbg rs rd
|
|
|
|
method insert_op op rs rd =
|
|
self#insert_op_debug op Debuginfo.none rs rd
|
|
|
|
end
|
|
|
|
let fundecl f = (new selector)#emit_fundecl f
|