254 lines
8.0 KiB
OCaml
254 lines
8.0 KiB
OCaml
(***********************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* Description of the Power PC *)
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open Misc
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open Cmm
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open Reg
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open Arch
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open Mach
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(* Instruction selection *)
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let word_addressed = false
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(* Registers available for register allocation *)
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(* Integer register map:
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0 temporary, null register for some operations
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1 stack pointer
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2 pointer to table of contents
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3 - 10 function arguments and results
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11 - 12 temporaries
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13 pointer to small data area
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14 - 28 general purpose, preserved by C
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29 trap pointer
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30 allocation limit
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31 allocation pointer
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Floating-point register map:
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0 temporary
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1 - 13 function arguments and results
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14 - 31 general purpose, preserved by C
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*)
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let int_reg_name =
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if Config.system = "rhapsody" then
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[| "r3"; "r4"; "r5"; "r6"; "r7"; "r8"; "r9"; "r10";
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"r14"; "r15"; "r16"; "r17"; "r18"; "r19"; "r20"; "r21";
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"r22"; "r23"; "r24"; "r25"; "r26"; "r27"; "r28" |]
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else
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[| "3"; "4"; "5"; "6"; "7"; "8"; "9"; "10";
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"14"; "15"; "16"; "17"; "18"; "19"; "20"; "21";
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"22"; "23"; "24"; "25"; "26"; "27"; "28" |]
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let float_reg_name =
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if Config.system = "rhapsody" then
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[| "f1"; "f2"; "f3"; "f4"; "f5"; "f6"; "f7"; "f8";
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"f9"; "f10"; "f11"; "f12"; "f13"; "f14"; "f15"; "f16";
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"f17"; "f18"; "f19"; "f20"; "f21"; "f22"; "f23"; "f24";
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"f25"; "f26"; "f27"; "f28"; "f29"; "f30"; "f31" |]
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else
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[| "1"; "2"; "3"; "4"; "5"; "6"; "7"; "8";
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"9"; "10"; "11"; "12"; "13"; "14"; "15"; "16";
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"17"; "18"; "19"; "20"; "21"; "22"; "23"; "24";
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"25"; "26"; "27"; "28"; "29"; "30"; "31" |]
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let num_register_classes = 2
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let register_class r =
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match r.typ with
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Int -> 0
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| Addr -> 0
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| Float -> 1
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let num_available_registers = [| 23; 31 |]
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let first_available_register = [| 0; 100 |]
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let register_name r =
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if r < 100 then int_reg_name.(r) else float_reg_name.(r - 100)
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let rotate_registers = true
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(* Representation of hard registers by pseudo-registers *)
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let hard_int_reg =
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let v = Array.make 23 Reg.dummy in
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for i = 0 to 22 do v.(i) <- Reg.at_location Int (Reg i) done; v
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let hard_float_reg =
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let v = Array.make 31 Reg.dummy in
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for i = 0 to 30 do v.(i) <- Reg.at_location Float (Reg(100 + i)) done; v
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let all_phys_regs =
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Array.append hard_int_reg hard_float_reg
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let phys_reg n =
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if n < 100 then hard_int_reg.(n) else hard_float_reg.(n - 100)
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let stack_slot slot ty =
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Reg.at_location ty (Stack slot)
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(* Calling conventions *)
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let calling_conventions
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first_int last_int first_float last_float make_stack stack_ofs arg =
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let loc = Array.make (Array.length arg) Reg.dummy in
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let int = ref first_int in
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let float = ref first_float in
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let ofs = ref stack_ofs in
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for i = 0 to Array.length arg - 1 do
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match arg.(i).typ with
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Int | Addr as ty ->
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if !int <= last_int then begin
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loc.(i) <- phys_reg !int;
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incr int
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end else begin
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loc.(i) <- stack_slot (make_stack !ofs) ty;
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ofs := !ofs + size_int
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end
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| Float ->
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if !float <= last_float then begin
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loc.(i) <- phys_reg !float;
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incr float
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end else begin
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loc.(i) <- stack_slot (make_stack !ofs) Float;
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ofs := !ofs + size_float
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end
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done;
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(loc, Misc.align !ofs 16)
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(* Keep stack 16-aligned. *)
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let incoming ofs = Incoming ofs
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let outgoing ofs = Outgoing ofs
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let not_supported ofs = fatal_error "Proc.loc_results: cannot call"
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let loc_arguments arg =
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calling_conventions 0 7 100 112 outgoing 0 arg
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let loc_parameters arg =
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let (loc, ofs) = calling_conventions 0 7 100 112 incoming 0 arg in loc
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let loc_results res =
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let (loc, ofs) = calling_conventions 0 7 100 112 not_supported 0 res in loc
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(* C calling conventions under PowerOpen:
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use GPR 3-10 and FPR 1-13 just like ML calling
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conventions, but always reserve stack space for all arguments.
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Also, using a float register automatically reserves two int registers
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(in 32-bit mode) or one int register (in 64-bit mode).
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(If we were to call a non-prototyped C function, each float argument
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would have to go both in a float reg and in the matching pair
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of integer regs.)
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C calling conventions under SVR4:
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use GPR 3-10 and FPR 1-8 just like ML calling conventions.
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Using a float register does not affect the int registers.
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Always reserve 8 bytes at bottom of stack, plus whatever is needed
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to hold the overflow arguments. *)
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let poweropen_external_conventions first_int last_int
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first_float last_float arg =
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let loc = Array.make (Array.length arg) Reg.dummy in
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let int = ref first_int in
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let float = ref first_float in
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let ofs = ref (14 * size_addr) in
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for i = 0 to Array.length arg - 1 do
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match arg.(i).typ with
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Int | Addr as ty ->
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if !int <= last_int then begin
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loc.(i) <- phys_reg !int;
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incr int
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end else begin
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loc.(i) <- stack_slot (Outgoing !ofs) ty;
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ofs := !ofs + size_int
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end
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| Float ->
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if !float <= last_float then begin
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loc.(i) <- phys_reg !float;
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incr float
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end else begin
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loc.(i) <- stack_slot (Outgoing !ofs) Float;
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ofs := !ofs + size_float
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end;
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int := !int + (if ppc64 then 1 else 2)
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done;
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(loc, Misc.align !ofs 16) (* Keep stack 16-aligned *)
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let loc_external_arguments =
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match Config.system with
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| "rhapsody" -> poweropen_external_conventions 0 7 100 112
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| "elf" | "bsd" | "bsd_elf" -> calling_conventions 0 7 100 107 outgoing 8
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| _ -> assert false
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let extcall_use_push = false
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(* Results are in GPR 3 and FPR 1 *)
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let loc_external_results res =
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let (loc, ofs) = calling_conventions 0 0 100 100 not_supported 0 res in loc
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(* Exceptions are in GPR 3 *)
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let loc_exn_bucket = phys_reg 0
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(* Volatile registers: none *)
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let regs_are_volatile rs = false
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(* Registers destroyed by operations *)
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let destroyed_at_c_call =
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Array.of_list(List.map phys_reg
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[0; 1; 2; 3; 4; 5; 6; 7;
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100; 101; 102; 103; 104; 105; 106; 107; 108; 109; 110; 111; 112])
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let destroyed_at_oper = function
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Iop(Icall_ind | Icall_imm _ | Iextcall(_, true)) -> all_phys_regs
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| Iop(Iextcall(_, false)) -> destroyed_at_c_call
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| _ -> [||]
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let destroyed_at_raise = all_phys_regs
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(* Maximal register pressure *)
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let safe_register_pressure = function
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Iextcall(_, _) -> 15
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| _ -> 23
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let max_register_pressure = function
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Iextcall(_, _) -> [| 15; 18 |]
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| _ -> [| 23; 30 |]
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(* Pure operations (without any side effect besides updating their result
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registers). *)
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let op_is_pure = function
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| Icall_ind | Icall_imm _ | Itailcall_ind | Itailcall_imm _
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| Iextcall _ | Istackoffset _ | Istore _ | Ialloc _
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| Iintop(Icheckbound) | Iintop_imm(Icheckbound, _) -> false
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| Ispecific(Imultaddf | Imultsubf) -> true
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| Ispecific _ -> false
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| _ -> true
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(* Layout of the stack *)
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let num_stack_slots = [| 0; 0 |]
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let contains_calls = ref false
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(* Calling the assembler *)
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let assemble_file infile outfile =
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Ccomp.command (Config.asm ^ " -o " ^
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Filename.quote outfile ^ " " ^ Filename.quote infile)
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let init () = ()
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