1 (***********************************************************************)
5 (* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
7 (* Copyright 1996 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. *)
11 (***********************************************************************)
13 (* $Id: proc.ml 8462 2007-10-30 12:37:16Z xleroy $ *)
15 (* Description of the HP PA-RISC processor *)
23 (* Registers available for register allocation *)
27 %r1 temporary, target of ADDIL
29 %r3 allocation pointer
32 %r6 - %r26 general purpose
34 %r28 - %r29 general purpose, C function results
36 %r31 temporary, used by BLE
38 %fr0 - %fr3 float status info
39 %fr4 - %fr30 general purpose
43 (* 0-4 *) "%r6"; "%r7"; "%r8"; "%r9"; "%r10";
44 (* 5-10 *) "%r11"; "%r12"; "%r13"; "%r14"; "%r15"; "%r16";
45 (* 11-16 *) "%r17"; "%r18"; "%r19"; "%r20"; "%r21"; "%r22";
46 (* 17-20 *) "%r23"; "%r24"; "%r25"; "%r26";
47 (* 21-22 *) "%r28"; "%r29"
50 let float_reg_name = [|
51 (* 100-105 *) "%fr4"; "%fr5"; "%fr6"; "%fr7"; "%fr8"; "%fr9";
52 (* 106-111 *) "%fr10"; "%fr11"; "%fr12"; "%fr13"; "%fr14"; "%fr15";
53 (* 112-117 *) "%fr16"; "%fr17"; "%fr18"; "%fr19"; "%fr20"; "%fr21";
54 (* 118-123 *) "%fr22"; "%fr23"; "%fr24"; "%fr25"; "%fr26"; "%fr27";
55 (* 124-127 *) "%fr28"; "%fr29"; "%fr30"; "%fr31"
58 let num_register_classes = 2
60 let register_class r =
66 let num_available_registers = [| 23; 27 |]
68 let first_available_register = [| 0; 100 |]
71 if r < 100 then int_reg_name.(r) else float_reg_name.(r - 100)
73 let rotate_registers = true
75 (* Representation of hard registers by pseudo-registers *)
78 let v = Array.create 23 Reg.dummy in
79 for i = 0 to 22 do v.(i) <- Reg.at_location Int (Reg i) done;
83 let v = Array.create 28 Reg.dummy in
84 for i = 0 to 27 do v.(i) <- Reg.at_location Float (Reg(100 + i)) done;
88 Array.append hard_int_reg (Array.sub hard_float_reg 0 27)
89 (* No need to include the left/right parts of float registers *)
92 if n < 100 then hard_int_reg.(n) else hard_float_reg.(n - 100)
94 let stack_slot slot ty =
95 Reg.at_location ty (Stack slot)
97 (* Instruction selection *)
99 let word_addressed = false
101 (* Calling conventions *)
103 let calling_conventions first_int last_int first_float last_float make_stack
105 let loc = Array.create (Array.length arg) Reg.dummy in
106 let int = ref first_int in
107 let float = ref first_float in
109 for i = 0 to Array.length arg - 1 do
110 match arg.(i).typ with
112 if !int >= last_int then begin
113 loc.(i) <- phys_reg !int;
116 ofs := !ofs + size_int;
117 loc.(i) <- stack_slot (make_stack !ofs) ty
120 if !float <= last_float then begin
121 loc.(i) <- phys_reg !float;
124 ofs := Misc.align (!ofs + size_float) 8;
125 loc.(i) <- stack_slot (make_stack !ofs) Float
128 (loc, Misc.align !ofs 8) (* Keep stack 8-aligned *)
130 let incoming ofs = Incoming ofs
131 let outgoing ofs = Outgoing ofs
132 let not_supported ofs = fatal_error "Proc.loc_results: cannot call"
134 (* Arguments and results: %r26-%r19, %fr4-%fr11. *)
136 let loc_arguments arg =
137 calling_conventions 20 13 100 107 outgoing arg
138 let loc_parameters arg =
139 let (loc, ofs) = calling_conventions 20 13 100 107 incoming arg in loc
140 let loc_results res =
141 let (loc, ofs) = calling_conventions 20 13 100 107 not_supported res in loc
143 (* Calling C functions:
144 when all arguments are integers, use %r26 - %r23,
145 then -52(%r30), -56(%r30), etc.
146 When some arguments are floats, we handle a couple of cases by hand
147 and fail otherwise. *)
149 let loc_external_arguments arg =
150 match List.map register_class (Array.to_list arg) with
151 [1] -> ([| phys_reg 101 |], 56) (* %fr5 *)
152 | [1; 1] -> ([| phys_reg 101; phys_reg 103 |], 56) (* %fr5, %fr7 *)
153 | [1; 0] -> ([| phys_reg 101; phys_reg 18 |], 56) (* %fr5, %r24 *)
154 | [0; 1] -> ([| phys_reg 20; phys_reg 103 |], 56) (* %r26, %fr7 *)
156 let loc = Array.create (Array.length arg) Reg.dummy in
159 for i = 0 to Array.length arg - 1 do
160 match arg.(i).typ with
162 if !int >= 17 then begin
163 loc.(i) <- phys_reg (!int);
167 loc.(i) <- stack_slot (Outgoing !ofs) ty
170 fatal_error "Proc.external_calling_conventions: cannot call"
172 (loc, Misc.align !ofs 8)
174 let loc_external_results res =
175 let (loc, ofs) = calling_conventions 21 21 100 100 not_supported res in loc
177 let loc_exn_bucket = phys_reg 20 (* %r26 *)
179 (* Registers destroyed by operations *)
181 let destroyed_at_c_call = (* %r3 - %r18, %fr12 - %fr21 preserved *)
182 Array.of_list(List.map phys_reg
183 [13;14;15;16;17;18;19;20;21;22;
184 100;101;102;103;104;105;106;107;118;119;120;121;122;123;124;125;126])
186 let destroyed_by_millicode = (* %r25, %r26, %r28, %r29 -- more? *)
187 [| phys_reg 19; phys_reg 20; phys_reg 21; phys_reg 22 |]
189 let destroyed_by_alloc = [| phys_reg 22 |] (* %r29 *)
191 let destroyed_at_oper = function
192 Iop(Icall_ind | Icall_imm _ | Iextcall(_, true)) -> all_phys_regs
193 | Iop(Iextcall(_, false)) -> destroyed_at_c_call
194 | Iop(Iintop(Idiv | Imod)) -> destroyed_by_millicode
195 | Iop(Ialloc _) -> destroyed_by_alloc
198 let destroyed_at_raise = all_phys_regs
200 (* Maximal register pressure *)
202 let safe_register_pressure = function
204 | Iintop(Idiv | Imod) -> 19
207 let max_register_pressure = function
208 Iextcall(_, _) -> [| 16; 19 |]
209 | Iintop(Idiv | Imod) -> [| 19; 27 |]
212 (* Layout of the stack *)
214 let num_stack_slots = [| 0; 0 |]
215 let contains_calls = ref false
217 (* Calling the assembler *)
219 let assemble_file infile outfile =
220 Ccomp.command (Config.asm ^ " -o " ^
221 Filename.quote outfile ^ " " ^ Filename.quote infile)