251 lines
8.0 KiB
OCaml
251 lines
8.0 KiB
OCaml
(***********************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Benedikt Meurer, University of Siegen *)
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(* *)
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(* Copyright 1998 Institut National de Recherche en Informatique *)
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(* et en Automatique. Copyright 2012 Benedikt Meurer. All rights *)
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(* reserved. This file is distributed under the terms of the Q *)
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(* Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* Description of the ARM processor *)
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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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r0 - r3 general purpose (not preserved)
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r4 - r7 general purpose (preserved)
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r8 trap pointer (preserved)
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r9 platform register, usually reserved
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r10 allocation pointer (preserved)
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r11 allocation limit (preserved)
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r12 intra-procedural scratch register (not preserved)
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r13 stack pointer
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r14 return address
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r15 program counter
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Floating-point register map (VFPv{2,3}):
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d0 - d7 general purpose (not preserved)
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d8 - d15 general purpose (preserved)
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d16 - d31 generat purpose (not preserved), VFPv3 only
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*)
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let int_reg_name =
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[| "r0"; "r1"; "r2"; "r3"; "r4"; "r5"; "r6"; "r7"; "r12" |]
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let float_reg_name =
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[| "d0"; "d1"; "d2"; "d3"; "d4"; "d5"; "d6"; "d7";
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"d8"; "d9"; "d10"; "d11"; "d12"; "d13"; "d14"; "d15";
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"d16"; "d17"; "d18"; "d19"; "d20"; "d21"; "d22"; "d23";
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"d24"; "d25"; "d26"; "d27"; "d28"; "d29"; "d30"; "d31" |]
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(* We have three register classes:
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0 for integer registers
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1 for VFPv2 and VFPv3-D16
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2 for VFPv3
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This way we can choose between VFPv2/VFPv3-D16 and VFPv3
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at (ocamlopt) runtime using command line switches.
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*)
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let num_register_classes = 3
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let register_class r =
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match (r.typ, !fpu) with
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(Int | Addr), _ -> 0
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| Float, VFPv2 -> 1
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| Float, VFPv3_D16 -> 1
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| Float, _ -> 2
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let num_available_registers =
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[| 9; 16; 32 |]
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let first_available_register =
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[| 0; 100; 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.create 9 Reg.dummy in
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for i = 0 to 8 do
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v.(i) <- Reg.at_location Int (Reg i)
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done;
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v
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let hard_float_reg =
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let v = Array.create 32 Reg.dummy in
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for i = 0 to 31 do
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v.(i) <- Reg.at_location Float (Reg(100 + i))
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done;
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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 arg =
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let loc = Array.create (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 0 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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assert (abi = EABI_HF);
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assert (!fpu >= VFPv2);
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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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ofs := Misc.align !ofs size_float;
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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 8) (* keep stack 8-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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(* OCaml calling convention:
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first integer args in r0...r7
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first float args in d0...d15 (EABI+VFP)
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remaining args on stack.
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Return values in r0...r7 or d0...d15. *)
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let loc_arguments arg =
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calling_conventions 0 7 100 115 outgoing arg
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let loc_parameters arg =
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let (loc, _) = calling_conventions 0 7 100 115 incoming arg in loc
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let loc_results res =
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let (loc, _) = calling_conventions 0 7 100 115 not_supported res in loc
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(* C calling convention:
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first integer args in r0...r3
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first float args in d0...d7 (EABI+VFP)
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remaining args on stack.
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Return values in r0...r1 or d0. *)
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let loc_external_arguments arg =
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calling_conventions 0 3 100 107 outgoing arg
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let loc_external_results res =
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let (loc, _) = calling_conventions 0 1 100 100 not_supported res in loc
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let loc_exn_bucket = phys_reg 0
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(* Registers destroyed by operations *)
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let destroyed_at_alloc = (* r0-r6, d0-d15 preserved *)
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Array.of_list (List.map
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phys_reg
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[7;8;
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116;116;118;119;120;121;122;123;
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124;125;126;127;128;129;130;131])
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let destroyed_at_c_call =
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Array.of_list (List.map
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phys_reg
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(match abi with
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EABI -> (* r4-r7 preserved *)
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[0;1;2;3;8;
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100;101;102;103;104;105;106;107;
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108;109;110;111;112;113;114;115;
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116;116;118;119;120;121;122;123;
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124;125;126;127;128;129;130;131]
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| EABI_HF -> (* r4-r7, d8-d15 preserved *)
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[0;1;2;3;8;
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100;101;102;103;104;105;106;107;
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116;116;118;119;120;121;122;123;
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124;125;126;127;128;129;130;131]))
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let destroyed_at_oper = function
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Iop(Icall_ind | Icall_imm _)
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| Iop(Iextcall(_, true)) ->
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all_phys_regs
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| Iop(Iextcall(_, false)) ->
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destroyed_at_c_call
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| Iop(Ialloc _) ->
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destroyed_at_alloc
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| Iop(Iconst_symbol _) when !pic_code ->
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[| phys_reg 3; phys_reg 8 |] (* r3 and r12 destroyed *)
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| Iop(Iintop Imulh) when !arch < ARMv6 ->
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[| phys_reg 8 |] (* r12 destroyed *)
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| Iop(Iintoffloat | Ifloatofint | Iload(Single, _) | Istore(Single, _, _)) ->
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[| phys_reg 107 |] (* d7 (s14-s15) destroyed *)
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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(_, _) -> if abi = EABI then 0 else 4
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| Ialloc _ -> if abi = EABI then 0 else 7
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| Iconst_symbol _ when !pic_code -> 7
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| _ -> 9
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let max_register_pressure = function
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Iextcall(_, _) -> if abi = EABI then [| 4; 0; 0 |] else [| 4; 8; 8 |]
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| Ialloc _ -> if abi = EABI then [| 7; 0; 0 |] else [| 7; 8; 8 |]
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| Iconst_symbol _ when !pic_code -> [| 7; 16; 32 |]
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| Iintoffloat | Ifloatofint
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| Iload(Single, _) | Istore(Single, _, _) -> [| 9; 15; 31 |]
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| _ -> [| 9; 16; 32 |]
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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, _)
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| Ispecific(Ishiftcheckbound _) -> false
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| _ -> true
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(* Layout of the stack *)
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let num_stack_slots = [| 0; 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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