1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 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. *)
(* *)
(***********************************************************************)
(* Description of the Sparc processor *)
open Misc
open Cmm
open Reg
open Arch
open Mach
(* Instruction selection *)
let word_addressed = false
(* Registers available for register allocation *)
(* Register map:
%o0 - %o5 0 - 5 function results, C functions args / res
%i0 - %i5 6 - 11 function arguments, preserved by C
%l0 - %l4 12 - 16 general purpose, preserved by C
%g3 - %g4 17 - 18 general purpose, not preserved by C
%l5 exception pointer
%l6 allocation pointer
%l7 address of allocation limit
%g0 always zero
%g1 - %g2 temporaries
%g5 - %g7 reserved for system libraries
%f0 - %f10 100 - 105 function arguments and results
%f12 - %f28 106 - 114 general purpose
%f30 temporary *)
let int_reg_name = [|
(* 0-5 *) "%o0"; "%o1"; "%o2"; "%o3"; "%o4"; "%o5";
(* 6-11 *) "%i0"; "%i1"; "%i2"; "%i3"; "%i4"; "%i5";
(* 12-16 *) "%l0"; "%l1"; "%l2"; "%l3"; "%l4";
(* 17-18 *) "%g3"; "%g4"
|]
let float_reg_name = [|
(* 100-105 *) "%f0"; "%f2"; "%f4"; "%f6"; "%f8"; "%f10";
(* 106-109 *) "%f12"; "%f14"; "%f16"; "%f18";
(* 110-114 *) "%f20"; "%f22"; "%f24"; "%f26"; "%f28";
(* 115 *) "%f30";
(* Odd parts of register pairs *)
(* 116-121 *) "%f1"; "%f3"; "%f5"; "%f7"; "%f9"; "%f11";
(* 122-125 *) "%f13"; "%f15"; "%f17"; "%f19";
(* 126-130 *) "%f21"; "%f23"; "%f25"; "%f27"; "%f29";
(* 131 *) "%f31"
|]
let num_register_classes = 2
let register_class r =
match r.typ with
Int -> 0
| Addr -> 0
| Float -> 1
let num_available_registers = [| 19; 15 |]
let first_available_register = [| 0; 100 |]
let register_name r =
if r < 100 then int_reg_name.(r) else float_reg_name.(r - 100)
let rotate_registers = true
(* Representation of hard registers by pseudo-registers *)
let hard_int_reg =
let v = Array.create 19 Reg.dummy in
for i = 0 to 18 do v.(i) <- Reg.at_location Int (Reg i) done;
v
let hard_float_reg =
let v = Array.create 32 Reg.dummy in
for i = 0 to 31 do v.(i) <- Reg.at_location Float (Reg(100 + i)) done;
v
let all_phys_regs =
Array.append hard_int_reg (Array.sub hard_float_reg 0 15)
(* No need to include the odd parts of float register pairs,
nor the temporary register %f30 *)
let phys_reg n =
if n < 100 then hard_int_reg.(n) else hard_float_reg.(n - 100)
let stack_slot slot ty =
Reg.at_location ty (Stack slot)
(* Calling conventions *)
let calling_conventions first_int last_int first_float last_float make_stack
arg =
let loc = Array.create (Array.length arg) Reg.dummy in
let int = ref first_int in
let float = ref first_float in
let ofs = ref 0 in
for i = 0 to Array.length arg - 1 do
match arg.(i).typ with
Int | Addr as ty ->
if !int <= last_int then begin
loc.(i) <- phys_reg !int;
incr int
end else begin
loc.(i) <- stack_slot (make_stack !ofs) ty;
ofs := !ofs + size_int
end
| Float ->
if !float <= last_float then begin
loc.(i) <- phys_reg !float;
incr float
end else begin
loc.(i) <- stack_slot (make_stack !ofs) Float;
ofs := !ofs + size_float
end
done;
(loc, Misc.align !ofs 8) (* Keep stack 8-aligned *)
let incoming ofs = Incoming ofs
let outgoing ofs = Outgoing ofs
let not_supported ofs = fatal_error "Proc.loc_results: cannot call"
let loc_arguments arg =
calling_conventions 6 15 100 105 outgoing arg
let loc_parameters arg =
let (loc, ofs) = calling_conventions 6 15 100 105 incoming arg in loc
let loc_results res =
let (loc, ofs) = calling_conventions 0 5 100 105 not_supported res in loc
(* On the Sparc, all arguments to C functions, even floating-point arguments,
are passed in %o0..%o5, then on the stack *)
let loc_external_arguments arg =
let loc = ref [] in
let reg = ref 0 (* %o0 *) in
let ofs = ref (-4) in (* start at sp + 92 = sp + 96 - 4 *)
for i = 0 to Array.length arg - 1 do
if !reg <= 5 (* %o5 *) then begin
match arg.(i).typ with
Int | Addr ->
loc := phys_reg !reg :: !loc;
incr reg
| Float ->
if !reg = 5 then fatal_error "Proc_sparc: cannot call";
loc := phys_reg (!reg + 1) :: phys_reg !reg :: !loc;
reg := !reg + 2
end else begin
loc := stack_slot (outgoing !ofs) arg.(i).typ :: !loc;
ofs := !ofs + size_component arg.(i).typ
end
done;
(* Keep stack 8-aligned *)
(Array.of_list(List.rev !loc), Misc.align (!ofs + 4) 8)
let loc_external_results res =
let (loc, ofs) = calling_conventions 0 0 100 100 not_supported res in loc
let loc_exn_bucket = phys_reg 0 (* $o0 *)
(* Registers destroyed by operations *)
let destroyed_at_c_call = (* %l0-%l4, %i0-%i5 preserved *)
Array.of_list(List.map phys_reg
[0; 1; 2; 3; 4; 5; 17; 18;
100; 101; 102; 103; 104; 105; 106; 107;
108; 109; 110; 111; 112; 113; 114])
let destroyed_at_oper = function
Iop(Icall_ind | Icall_imm _ | Iextcall(_, true)) -> all_phys_regs
| Iop(Iextcall(_, false)) -> destroyed_at_c_call
| _ -> [||]
let destroyed_at_raise = all_phys_regs
(* Maximal register pressure *)
let safe_register_pressure = function
Iextcall(_, _) -> 0
| _ -> 15
let max_register_pressure = function
Iextcall(_, _) -> [| 11; 0 |]
| _ -> [| 19; 15 |]
(* Pure operations (without any side effect besides updating their result
registers). *)
let op_is_pure = function
| Icall_ind | Icall_imm _ | Itailcall_ind | Itailcall_imm _
| Iextcall _ | Istackoffset _ | Istore _ | Ialloc _
| Iintop(Icheckbound) | Iintop_imm(Icheckbound, _) -> false
| _ -> true
(* Layout of the stack *)
let num_stack_slots = [| 0; 0 |]
let contains_calls = ref false
(* Calling the assembler and the archiver *)
let assemble_file infile outfile =
let asflags = begin match !arch_version with
SPARC_V7 -> " -o "
| SPARC_V8 -> " -xarch=v8 -o "
| SPARC_V9 -> " -xarch=v8plus -o "
end in
Ccomp.command (Config.asm ^ asflags ^
Filename.quote outfile ^ " " ^ Filename.quote infile)
let init () = ()
|
