931 lines
31 KiB
Plaintext
931 lines
31 KiB
Plaintext
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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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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(* $Id$ *)
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(* Emission of PowerPC assembly code *)
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module StringSet = Set.Make(struct type t = string let compare = compare end)
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open Location
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open Misc
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open Cmm
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open Arch
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open Proc
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open Reg
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open Mach
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open Linearize
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open Emitaux
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(* Layout of the stack. The stack is kept 16-aligned. *)
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let stack_offset = ref 0
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let frame_size () =
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let size =
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!stack_offset + (* Trap frame, outgoing parameters *)
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4 * num_stack_slots.(0) + 8 * num_stack_slots.(1) + (* Local variables *)
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(if !contains_calls then 4 else 0) in (* The return address *)
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Misc.align size 16
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let slot_offset loc cls =
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match loc with
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Local n ->
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if cls = 0
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then !stack_offset + num_stack_slots.(1) * 8 + n * 4
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else !stack_offset + n * 8
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| Incoming n -> frame_size() + n
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| Outgoing n -> n
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(* Output a symbol *)
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let emit_symbol =
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match Config.system with
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| "elf" | "bsd" -> (fun s -> Emitaux.emit_symbol '.' s)
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| "rhapsody" -> (fun s -> emit_char '_'; Emitaux.emit_symbol '$' s)
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| _ -> assert false
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(* Output a label *)
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let label_prefix =
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match Config.system with
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| "elf" | "bsd" -> ".L"
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| "rhapsody" -> "L"
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| _ -> assert false
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let emit_label lbl =
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emit_string label_prefix; emit_int lbl
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(* Section switching *)
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let data_space =
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match Config.system with
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| "elf" | "bsd" -> " .section \".data\"\n"
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| "rhapsody" -> " .data\n"
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| _ -> assert false
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let code_space =
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match Config.system with
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| "elf" | "bsd" -> " .section \".text\"\n"
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| "rhapsody" -> " .text\n"
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| _ -> assert false
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let rodata_space =
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match Config.system with
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| "elf" | "bsd" -> " .section \".rodata\"\n"
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| "rhapsody" -> " .const\n"
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| _ -> assert false
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(* Output a pseudo-register *)
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let emit_reg r =
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match r.loc with
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Reg r -> emit_string (register_name r)
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| _ -> fatal_error "Emit.emit_reg"
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let use_full_regnames =
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Config.system = "rhapsody"
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let emit_gpr r =
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if use_full_regnames then emit_char 'r';
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emit_int r
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let emit_fpr r =
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if use_full_regnames then emit_char 'f';
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emit_int r
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let emit_ccr r =
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if use_full_regnames then emit_string "cr";
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emit_int r
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(* Output a stack reference *)
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let emit_stack r =
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match r.loc with
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Stack s ->
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let ofs = slot_offset s (register_class r) in `{emit_int ofs}({emit_gpr 1})`
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| _ -> fatal_error "Emit.emit_stack"
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(* Split a 32-bit integer constants in two 16-bit halves *)
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let low n = n land 0xFFFF
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let high n = n asr 16
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let nativelow n = Nativeint.to_int n land 0xFFFF
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let nativehigh n = Nativeint.to_int (Nativeint.shift_right n 16)
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let is_immediate n =
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n <= 32767 && n >= -32768
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let is_native_immediate n =
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n <= Nativeint.of_int 32767 && n >= Nativeint.of_int (-32768)
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(* Output a "upper 16 bits" or "lower 16 bits" operator. *)
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let emit_upper emit_fun arg =
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match Config.system with
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| "elf" | "bsd" ->
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emit_fun arg; emit_string "@ha"
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| "rhapsody" ->
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emit_string "ha16("; emit_fun arg; emit_string ")"
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| _ -> assert false
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let emit_lower emit_fun arg =
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match Config.system with
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| "elf" | "bsd" ->
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emit_fun arg; emit_string "@l"
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| "rhapsody" ->
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emit_string "lo16("; emit_fun arg; emit_string ")"
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| _ -> assert false
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(* Output a load or store operation *)
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let emit_symbol_offset (s, d) =
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emit_symbol s;
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if d > 0 then `+`;
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if d <> 0 then emit_int d
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let emit_load_store instr addressing_mode addr n arg =
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match addressing_mode with
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Ibased(s, d) ->
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` addis {emit_gpr 11}, 0, {emit_upper emit_symbol_offset (s,d)}\n`;
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` {emit_string instr} {emit_reg arg}, {emit_lower emit_symbol_offset (s,d)}({emit_gpr 11})\n`
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| Iindexed ofs ->
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if is_immediate ofs then
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` {emit_string instr} {emit_reg arg}, {emit_int ofs}({emit_reg addr.(n)})\n`
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else begin
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` lis {emit_gpr 0}, {emit_int(high ofs)}\n`;
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if low ofs <> 0 then
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` ori {emit_gpr 0}, {emit_gpr 0}, {emit_int(low ofs)}\n`;
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` {emit_string instr}x {emit_reg arg}, {emit_reg addr.(n)}, {emit_gpr 0}\n`
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end
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| Iindexed2 ->
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` {emit_string instr}x {emit_reg arg}, {emit_reg addr.(n)}, {emit_reg addr.(n+1)}\n`
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(* After a comparison, extract the result as 0 or 1 *)
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let emit_set_comp cmp res =
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` mfcr {emit_gpr 0}\n`;
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let bitnum =
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match cmp with
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Ceq | Cne -> 2
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| Cgt | Cle -> 1
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| Clt | Cge -> 0 in
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` rlwinm {emit_reg res}, {emit_gpr 0}, {emit_int(bitnum+1)}, 31, 31\n`;
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begin match cmp with
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Cne | Cle | Cge -> ` xori {emit_reg res}, {emit_reg res}, 1\n`
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| _ -> ()
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end
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(* Record live pointers at call points *)
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type frame_descr =
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{ fd_lbl: int; (* Return address *)
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fd_frame_size: int; (* Size of stack frame *)
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fd_live_offset: int list } (* Offsets/regs of live addresses *)
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let frame_descriptors = ref([] : frame_descr list)
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let record_frame live =
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let lbl = new_label() in
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let live_offset = ref [] in
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Reg.Set.iter
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(function
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{typ = Addr; loc = Reg r} ->
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live_offset := (r lsl 1) + 1 :: !live_offset
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| {typ = Addr; loc = Stack s} as reg ->
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live_offset := slot_offset s (register_class reg) :: !live_offset
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| _ -> ())
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live;
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frame_descriptors :=
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{ fd_lbl = lbl;
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fd_frame_size = frame_size();
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fd_live_offset = !live_offset } :: !frame_descriptors;
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`{emit_label lbl}:`
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let emit_frame fd =
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` .long {emit_label fd.fd_lbl} + 4\n`;
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` .short {emit_int fd.fd_frame_size}\n`;
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` .short {emit_int (List.length fd.fd_live_offset)}\n`;
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List.iter
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(fun n ->
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` .short {emit_int n}\n`)
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fd.fd_live_offset;
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` .align 2\n`
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(* Record floating-point literals *)
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let float_literals = ref ([] : (string * int) list)
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(* Record external C functions to be called in a position-independent way
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(for MacOSX) *)
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let pic_externals = (Config.system = "rhapsody")
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let external_functions = ref StringSet.empty
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let emit_external s =
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` .non_lazy_symbol_pointer\n`;
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`L{emit_symbol s}$non_lazy_ptr:\n`;
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` .indirect_symbol {emit_symbol s}\n`;
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` .long 0\n`
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(* Names for conditional branches after comparisons *)
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let branch_for_comparison = function
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Ceq -> "beq" | Cne -> "bne"
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| Cle -> "ble" | Cgt -> "bgt"
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| Cge -> "bge" | Clt -> "blt"
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let name_for_int_comparison = function
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Isigned cmp -> ("cmpw", branch_for_comparison cmp)
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| Iunsigned cmp -> ("cmplw", branch_for_comparison cmp)
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(* Names for various instructions *)
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let name_for_intop = function
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Iadd -> "add"
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| Imul -> "mullw"
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| Idiv -> "divw"
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| Iand -> "and"
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| Ior -> "or"
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| Ixor -> "xor"
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| Ilsl -> "slw"
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| Ilsr -> "srw"
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| Iasr -> "sraw"
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| _ -> Misc.fatal_error "Emit.Intop"
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let name_for_intop_imm = function
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Iadd -> "addi"
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| Imul -> "mulli"
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| Iand -> "andi."
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| Ior -> "ori"
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| Ixor -> "xori"
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| Ilsl -> "slwi"
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| Ilsr -> "srwi"
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| Iasr -> "srawi"
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| _ -> Misc.fatal_error "Emit.Intop_imm"
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let name_for_floatop1 = function
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Inegf -> "fneg"
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| Iabsf -> "fabs"
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| _ -> Misc.fatal_error "Emit.Iopf1"
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let name_for_floatop2 = function
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Iaddf -> "fadd"
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| Isubf -> "fsub"
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| Imulf -> "fmul"
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| Idivf -> "fdiv"
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| _ -> Misc.fatal_error "Emit.Iopf2"
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let name_for_specific = function
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Imultaddf -> "fmadd"
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| Imultsubf -> "fmsub"
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| _ -> Misc.fatal_error "Emit.Ispecific"
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(* Name of current function *)
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let function_name = ref ""
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(* Entry point for tail recursive calls *)
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let tailrec_entry_point = ref 0
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(* Names of functions defined in the current file *)
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let defined_functions = ref StringSet.empty
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(* Label of glue code for calling the GC *)
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let call_gc_label = ref 0
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(* Label of jump table *)
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let lbl_jumptbl = ref 0
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(* List of all labels in jumptable (reverse order) *)
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let jumptbl_entries = ref []
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(* Number of jumptable entries *)
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let num_jumptbl_entries = ref 0
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(* Fixup conditional branches that exceed hardware allowed range *)
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let load_store_size = function
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Ibased(s, d) -> 2
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| Iindexed ofs -> if is_immediate ofs then 1 else 3
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| Iindexed2 -> 1
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let instr_size = function
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Lend -> 0
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| Lop(Imove | Ispill | Ireload) -> 1
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| Lop(Iconst_int n) -> if is_native_immediate n then 1 else 2
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| Lop(Iconst_float s) -> 2
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| Lop(Iconst_symbol s) -> 2
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| Lop(Icall_ind) -> 2
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| Lop(Icall_imm s) -> 1
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| Lop(Itailcall_ind) -> 5
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| Lop(Itailcall_imm s) -> if s = !function_name then 1 else 4
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| Lop(Iextcall(s, true)) -> 3
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| Lop(Iextcall(s, false)) -> if pic_externals then 4 else 1
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| Lop(Istackoffset n) -> 1
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| Lop(Iload(chunk, addr)) ->
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if chunk = Byte_signed
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then load_store_size addr + 1
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else load_store_size addr
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| Lop(Istore(chunk, addr)) -> load_store_size addr
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| Lop(Ialloc n) -> 4
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| Lop(Ispecific(Ialloc_far n)) -> 5
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| Lop(Iintop Imod) -> 3
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| Lop(Iintop(Icomp cmp)) -> 4
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| Lop(Iintop op) -> 1
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| Lop(Iintop_imm(Idiv, n)) -> 2
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| Lop(Iintop_imm(Imod, n)) -> 4
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| Lop(Iintop_imm(Icomp cmp, n)) -> 4
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| Lop(Iintop_imm(op, n)) -> 1
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| Lop(Inegf | Iabsf | Iaddf | Isubf | Imulf | Idivf) -> 1
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| Lop(Ifloatofint) -> 9
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| Lop(Iintoffloat) -> 4
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| Lop(Ispecific sop) -> 1
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| Lreloadretaddr -> 2
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| Lreturn -> 2
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| Llabel lbl -> 0
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| Lbranch lbl -> 1
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| Lcondbranch(tst, lbl) -> 2
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| Lcondbranch3(lbl0, lbl1, lbl2) ->
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1 + (if lbl0 = None then 0 else 1)
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+ (if lbl1 = None then 0 else 1)
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+ (if lbl2 = None then 0 else 1)
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| Lswitch jumptbl -> 8
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| Lsetuptrap lbl -> 1
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| Lpushtrap -> 4
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| Lpoptrap -> 2
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| Lraise -> 6
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let label_map code =
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let map = Hashtbl.create 37 in
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let rec fill_map pc instr =
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match instr.desc with
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Lend -> (pc, map)
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| Llabel lbl -> Hashtbl.add map lbl pc; fill_map pc instr.next
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| op -> fill_map (pc + instr_size op) instr.next
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in fill_map 0 code
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let max_branch_offset = 8180
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(* 14-bit signed offset in words. Remember to cut some slack
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for multi-word instructions where the branch can be anywhere in
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the middle. 12 words of slack is plenty. *)
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let branch_overflows map pc_branch lbl_dest =
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let pc_dest = Hashtbl.find map lbl_dest in
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let delta = pc_dest - (pc_branch + 1) in
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delta <= -max_branch_offset || delta >= max_branch_offset
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let opt_branch_overflows map pc_branch opt_lbl_dest =
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match opt_lbl_dest with
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None -> false
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| Some lbl_dest -> branch_overflows map pc_branch lbl_dest
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let fixup_branches codesize map code =
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let expand_optbranch lbl n arg next =
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match lbl with
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None -> next
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| Some l ->
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instr_cons (Lcondbranch(Iinttest_imm(Isigned Ceq, n), l))
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arg [||] next in
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let rec fixup did_fix pc instr =
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match instr.desc with
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Lend -> did_fix
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| Lcondbranch(test, lbl) when branch_overflows map pc lbl ->
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let lbl2 = new_label() in
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let cont =
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instr_cons (Lbranch lbl) [||] [||]
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(instr_cons (Llabel lbl2) [||] [||] instr.next) in
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instr.desc <- Lcondbranch(invert_test test, lbl2);
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instr.next <- cont;
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fixup true (pc + 2) instr.next
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| Lcondbranch3(lbl0, lbl1, lbl2)
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when opt_branch_overflows map pc lbl0
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|| opt_branch_overflows map pc lbl1
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|| opt_branch_overflows map pc lbl2 ->
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let cont =
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expand_optbranch lbl0 0 instr.arg
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(expand_optbranch lbl1 1 instr.arg
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(expand_optbranch lbl2 2 instr.arg instr.next)) in
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instr.desc <- cont.desc;
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instr.next <- cont.next;
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fixup true pc instr
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| Lop(Ialloc n) when codesize - pc >= max_branch_offset ->
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instr.desc <- Lop(Ispecific(Ialloc_far n));
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fixup true (pc + 4) instr.next
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| op ->
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fixup did_fix (pc + instr_size op) instr.next
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in fixup false 0 code
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(* Iterate branch expansion till all conditional branches are OK *)
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let rec branch_normalization code =
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let (codesize, map) = label_map code in
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if codesize >= max_branch_offset && fixup_branches codesize map code
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then branch_normalization code
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else ()
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(* Output the assembly code for an instruction *)
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let rec emit_instr i dslot =
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match i.desc with
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Lend -> ()
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| Lop(Imove | Ispill | Ireload) ->
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let src = i.arg.(0) and dst = i.res.(0) in
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if src.loc <> dst.loc then begin
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match (src, dst) with
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{loc = Reg rs; typ = (Int | Addr)}, {loc = Reg rd} ->
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` mr {emit_reg dst}, {emit_reg src}\n`
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| {loc = Reg rs; typ = Float}, {loc = Reg rd; typ = Float} ->
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` fmr {emit_reg dst}, {emit_reg src}\n`
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| {loc = Reg rs; typ = (Int | Addr)}, {loc = Stack sd} ->
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` stw {emit_reg src}, {emit_stack dst}\n`
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| {loc = Reg rs; typ = Float}, {loc = Stack sd} ->
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` stfd {emit_reg src}, {emit_stack dst}\n`
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| {loc = Stack ss; typ = (Int | Addr)}, {loc = Reg rd} ->
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` lwz {emit_reg dst}, {emit_stack src}\n`
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| {loc = Stack ss; typ = Float}, {loc = Reg rd} ->
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` lfd {emit_reg dst}, {emit_stack src}\n`
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| (_, _) ->
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fatal_error "Emit: Imove"
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end
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| Lop(Iconst_int n) ->
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if is_native_immediate n then
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` li {emit_reg i.res.(0)}, {emit_nativeint n}\n`
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else begin
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` lis {emit_reg i.res.(0)}, {emit_int(nativehigh n)}\n`;
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if nativelow n <> 0 then
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` ori {emit_reg i.res.(0)}, {emit_reg i.res.(0)}, {emit_int(nativelow n)}\n`
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end
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| Lop(Iconst_float s) ->
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let lbl = new_label() in
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float_literals := (s, lbl) :: !float_literals;
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` addis {emit_gpr 11}, 0, {emit_upper emit_label lbl}\n`;
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` lfd {emit_reg i.res.(0)}, {emit_lower emit_label lbl}({emit_gpr 11})\n`
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| Lop(Iconst_symbol s) ->
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` addis {emit_reg i.res.(0)}, 0, {emit_upper emit_symbol s}\n`;
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` addi {emit_reg i.res.(0)}, {emit_reg i.res.(0)}, {emit_lower emit_symbol s}\n`
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| Lop(Icall_ind) ->
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` mtctr {emit_reg i.arg.(0)}\n`;
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record_frame i.live;
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` bctrl\n`
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| Lop(Icall_imm s) ->
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record_frame i.live;
|
|
` bl {emit_symbol s}\n`
|
|
| Lop(Itailcall_ind) ->
|
|
let n = frame_size() in
|
|
` mtctr {emit_reg i.arg.(0)}\n`;
|
|
if !contains_calls then begin
|
|
` lwz {emit_gpr 11}, {emit_int(n - 4)}({emit_gpr 1})\n`;
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int n}\n`;
|
|
` mtlr {emit_gpr 11}\n`
|
|
end else begin
|
|
if n > 0 then
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int n}\n`
|
|
end;
|
|
` bctr\n`
|
|
| Lop(Itailcall_imm s) ->
|
|
if s = !function_name then
|
|
` b {emit_label !tailrec_entry_point}\n`
|
|
else begin
|
|
let n = frame_size() in
|
|
if !contains_calls then begin
|
|
` lwz {emit_gpr 11}, {emit_int(n - 4)}({emit_gpr 1})\n`;
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int n}\n`;
|
|
` mtlr {emit_gpr 11}\n`
|
|
end else begin
|
|
if n > 0 then
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int n}\n`
|
|
end;
|
|
` b {emit_symbol s}\n`
|
|
end
|
|
| Lop(Iextcall(s, alloc)) ->
|
|
if alloc then begin
|
|
if pic_externals then begin
|
|
external_functions := StringSet.add s !external_functions;
|
|
` addis {emit_gpr 11}, 0, ha16(L{emit_symbol s}$non_lazy_ptr)\n`;
|
|
` lwz {emit_gpr 11}, lo16(L{emit_symbol s}$non_lazy_ptr)({emit_gpr 11})\n`
|
|
end else begin
|
|
` addis {emit_gpr 11}, 0, {emit_upper emit_symbol s}\n`;
|
|
` addi {emit_gpr 11}, {emit_gpr 11}, {emit_lower emit_symbol s}\n`
|
|
end;
|
|
record_frame i.live;
|
|
` bl {emit_symbol "caml_c_call"}\n`
|
|
end else begin
|
|
if pic_externals then begin
|
|
external_functions := StringSet.add s !external_functions;
|
|
` addis {emit_gpr 11}, 0, ha16(L{emit_symbol s}$non_lazy_ptr)\n`;
|
|
` lwz {emit_gpr 11}, lo16(L{emit_symbol s}$non_lazy_ptr)({emit_gpr 11})\n`;
|
|
` mtctr {emit_gpr 11}\n`;
|
|
` bctrl\n`
|
|
end else
|
|
` bl {emit_symbol s}\n`
|
|
end
|
|
| Lop(Istackoffset n) ->
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int (-n)}\n`;
|
|
stack_offset := !stack_offset + n
|
|
| Lop(Iload(chunk, addr)) ->
|
|
let loadinstr =
|
|
match chunk with
|
|
Byte_unsigned -> "lbz"
|
|
| Byte_signed -> "lbz"
|
|
| Sixteen_unsigned -> "lhz"
|
|
| Sixteen_signed -> "lha"
|
|
| Single -> "lfs"
|
|
| Double | Double_u -> "lfd"
|
|
| _ -> "lwz" in
|
|
emit_load_store loadinstr addr i.arg 0 i.res.(0);
|
|
if chunk = Byte_signed then
|
|
` extsb {emit_reg i.res.(0)}, {emit_reg i.res.(0)}\n`
|
|
| Lop(Istore(chunk, addr)) ->
|
|
let storeinstr =
|
|
match chunk with
|
|
Byte_unsigned | Byte_signed -> "stb"
|
|
| Sixteen_unsigned | Sixteen_signed -> "sth"
|
|
| Single -> "stfs"
|
|
| Double | Double_u -> "stfd"
|
|
| _ -> "stw" in
|
|
emit_load_store storeinstr addr i.arg 1 i.arg.(0)
|
|
| Lop(Ialloc n) ->
|
|
if !call_gc_label = 0 then call_gc_label := new_label();
|
|
` addi {emit_gpr 31}, {emit_gpr 31}, {emit_int(-n)}\n`;
|
|
` cmplw {emit_gpr 31}, {emit_gpr 30}\n`;
|
|
` addi {emit_reg i.res.(0)}, {emit_gpr 31}, 4\n`;
|
|
record_frame i.live;
|
|
` bltl {emit_label !call_gc_label}\n`
|
|
| Lop(Ispecific(Ialloc_far n)) ->
|
|
if !call_gc_label = 0 then call_gc_label := new_label();
|
|
let lbl = new_label() in
|
|
` addi {emit_gpr 31}, {emit_gpr 31}, {emit_int(-n)}\n`;
|
|
` cmplw {emit_gpr 31}, {emit_gpr 30}\n`;
|
|
` bge {emit_label lbl}\n`;
|
|
record_frame i.live;
|
|
` bl {emit_label !call_gc_label}\n`;
|
|
`{emit_label lbl}: addi {emit_reg i.res.(0)}, {emit_gpr 31}, 4\n`
|
|
| Lop(Iintop Isub) -> (* subfc has swapped arguments *)
|
|
` subfc {emit_reg i.res.(0)}, {emit_reg i.arg.(1)}, {emit_reg i.arg.(0)}\n`
|
|
| Lop(Iintop Imod) ->
|
|
` divw {emit_gpr 0}, {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`;
|
|
` mullw {emit_gpr 0}, {emit_gpr 0}, {emit_reg i.arg.(1)}\n`;
|
|
` subfc {emit_reg i.res.(0)}, {emit_gpr 0}, {emit_reg i.arg.(0)}\n`
|
|
| Lop(Iintop(Icomp cmp)) ->
|
|
begin match cmp with
|
|
Isigned c ->
|
|
` cmpw {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`;
|
|
emit_set_comp c i.res.(0)
|
|
| Iunsigned c ->
|
|
` cmplw {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`;
|
|
emit_set_comp c i.res.(0)
|
|
end
|
|
| Lop(Iintop Icheckbound) ->
|
|
` twlle {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`
|
|
| Lop(Iintop op) ->
|
|
let instr = name_for_intop op in
|
|
` {emit_string instr} {emit_reg i.res.(0)}, {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`
|
|
| Lop(Iintop_imm(Isub, n)) ->
|
|
` addi {emit_reg i.res.(0)}, {emit_reg i.arg.(0)}, {emit_int(-n)}\n`
|
|
| Lop(Iintop_imm(Idiv, n)) -> (* n is guaranteed to be a power of 2 *)
|
|
let l = Misc.log2 n in
|
|
` srawi {emit_reg i.res.(0)}, {emit_reg i.arg.(0)}, {emit_int l}\n`;
|
|
` addze {emit_reg i.res.(0)}, {emit_reg i.res.(0)}\n`
|
|
| Lop(Iintop_imm(Imod, n)) -> (* n is guaranteed to be a power of 2 *)
|
|
let l = Misc.log2 n in
|
|
` srawi {emit_gpr 0}, {emit_reg i.arg.(0)}, {emit_int l}\n`;
|
|
` addze {emit_gpr 0}, {emit_gpr 0}\n`;
|
|
` slwi {emit_gpr 0}, {emit_gpr 0}, {emit_int l}\n`;
|
|
` subfc {emit_reg i.res.(0)}, {emit_gpr 0}, {emit_reg i.arg.(0)}\n`
|
|
| Lop(Iintop_imm(Icomp cmp, n)) ->
|
|
begin match cmp with
|
|
Isigned c ->
|
|
` cmpwi {emit_reg i.arg.(0)}, {emit_int n}\n`;
|
|
emit_set_comp c i.res.(0)
|
|
| Iunsigned c ->
|
|
` cmplwi {emit_reg i.arg.(0)}, {emit_int n}\n`;
|
|
emit_set_comp c i.res.(0)
|
|
end
|
|
| Lop(Iintop_imm(Icheckbound, n)) ->
|
|
` twllei {emit_reg i.arg.(0)}, {emit_int n}\n`
|
|
| Lop(Iintop_imm(op, n)) ->
|
|
let instr = name_for_intop_imm op in
|
|
` {emit_string instr} {emit_reg i.res.(0)}, {emit_reg i.arg.(0)}, {emit_int n}\n`
|
|
| Lop(Inegf | Iabsf as op) ->
|
|
let instr = name_for_floatop1 op in
|
|
` {emit_string instr} {emit_reg i.res.(0)}, {emit_reg i.arg.(0)}\n`
|
|
| Lop(Iaddf | Isubf | Imulf | Idivf as op) ->
|
|
let instr = name_for_floatop2 op in
|
|
` {emit_string instr} {emit_reg i.res.(0)}, {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`
|
|
| Lop(Ifloatofint) ->
|
|
let lbl = new_label() in
|
|
float_literals := ("4.503601774854144e15", lbl) :: !float_literals;
|
|
(* That float above represents 0x4330000080000000 *)
|
|
` addis {emit_gpr 11}, 0, {emit_upper emit_label lbl}\n`;
|
|
` lfd {emit_fpr 0}, {emit_lower emit_label lbl}({emit_gpr 11})\n`;
|
|
` lis {emit_gpr 0}, 0x4330\n`;
|
|
` stwu {emit_gpr 0}, -8({emit_gpr 1})\n`;
|
|
` xoris {emit_gpr 0}, {emit_reg i.arg.(0)}, 0x8000\n`;
|
|
` stw {emit_gpr 0}, 4({emit_gpr 1})\n`;
|
|
` lfd {emit_reg i.res.(0)}, 0({emit_gpr 1})\n`;
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, 8\n`;
|
|
` fsub {emit_reg i.res.(0)}, {emit_reg i.res.(0)}, {emit_fpr 0}\n`
|
|
| Lop(Iintoffloat) ->
|
|
` fctiwz {emit_fpr 0}, {emit_reg i.arg.(0)}\n`;
|
|
` stfdu {emit_fpr 0}, -8({emit_gpr 1})\n`;
|
|
` lwz {emit_reg i.res.(0)}, 4({emit_gpr 1})\n`;
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, 8\n`
|
|
| Lop(Ispecific sop) ->
|
|
let instr = name_for_specific sop in
|
|
` {emit_string instr} {emit_reg i.res.(0)}, {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}, {emit_reg i.arg.(2)}\n`
|
|
| Lreloadretaddr ->
|
|
let n = frame_size() in
|
|
` lwz {emit_gpr 11}, {emit_int(n - 4)}({emit_gpr 1})\n`;
|
|
` mtlr {emit_gpr 11}\n`
|
|
| Lreturn ->
|
|
let n = frame_size() in
|
|
if n > 0 then
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int n}\n`;
|
|
` blr\n`
|
|
| Llabel lbl ->
|
|
`{emit_label lbl}:\n`
|
|
| Lbranch lbl ->
|
|
` b {emit_label lbl}\n`
|
|
| Lcondbranch(tst, lbl) ->
|
|
begin match tst with
|
|
Itruetest ->
|
|
` cmpwi {emit_reg i.arg.(0)}, 0\n`;
|
|
emit_delay dslot;
|
|
` bne {emit_label lbl}\n`
|
|
| Ifalsetest ->
|
|
` cmpwi {emit_reg i.arg.(0)}, 0\n`;
|
|
emit_delay dslot;
|
|
` beq {emit_label lbl}\n`
|
|
| Iinttest cmp ->
|
|
let (comp, branch) = name_for_int_comparison cmp in
|
|
` {emit_string comp} {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`;
|
|
emit_delay dslot;
|
|
` {emit_string branch} {emit_label lbl}\n`
|
|
| Iinttest_imm(cmp, n) ->
|
|
let (comp, branch) = name_for_int_comparison cmp in
|
|
` {emit_string comp}i {emit_reg i.arg.(0)}, {emit_int n}\n`;
|
|
emit_delay dslot;
|
|
` {emit_string branch} {emit_label lbl}\n`
|
|
| Ifloattest(cmp, neg) ->
|
|
` fcmpu {emit_ccr 0}, {emit_reg i.arg.(0)}, {emit_reg i.arg.(1)}\n`;
|
|
(* bit 0 = lt, bit 1 = gt, bit 2 = eq *)
|
|
let (bitnum, negtst) =
|
|
match cmp with
|
|
Ceq -> (2, neg)
|
|
| Cne -> (2, not neg)
|
|
| Cle -> ` cror 3, 0, 2\n`; (* lt or eq *)
|
|
(3, neg)
|
|
| Cgt -> (1, neg)
|
|
| Cge -> ` cror 3, 1, 2\n`; (* gt or eq *)
|
|
(3, neg)
|
|
| Clt -> (0, neg) in
|
|
emit_delay dslot;
|
|
if negtst
|
|
then ` bf {emit_int bitnum}, {emit_label lbl}\n`
|
|
else ` bt {emit_int bitnum}, {emit_label lbl}\n`
|
|
| Ioddtest ->
|
|
` andi. {emit_gpr 0}, {emit_reg i.arg.(0)}, 1\n`;
|
|
emit_delay dslot;
|
|
` bne {emit_label lbl}\n`
|
|
| Ieventest ->
|
|
` andi. {emit_gpr 0}, {emit_reg i.arg.(0)}, 1\n`;
|
|
emit_delay dslot;
|
|
` beq {emit_label lbl}\n`
|
|
end
|
|
| Lcondbranch3(lbl0, lbl1, lbl2) ->
|
|
` cmpwi {emit_reg i.arg.(0)}, 1\n`;
|
|
emit_delay dslot;
|
|
begin match lbl0 with
|
|
None -> ()
|
|
| Some lbl -> ` blt {emit_label lbl}\n`
|
|
end;
|
|
begin match lbl1 with
|
|
None -> ()
|
|
| Some lbl -> ` beq {emit_label lbl}\n`
|
|
end;
|
|
begin match lbl2 with
|
|
None -> ()
|
|
| Some lbl -> ` bgt {emit_label lbl}\n`
|
|
end
|
|
| Lswitch jumptbl ->
|
|
if !lbl_jumptbl = 0 then lbl_jumptbl := new_label();
|
|
` addis {emit_gpr 11}, 0, {emit_upper emit_label !lbl_jumptbl}\n`;
|
|
` addi {emit_gpr 11}, {emit_gpr 11}, {emit_lower emit_label !lbl_jumptbl}\n`;
|
|
` addi {emit_gpr 0}, {emit_reg i.arg.(0)}, {emit_int !num_jumptbl_entries}\n`;
|
|
` slwi {emit_gpr 0}, {emit_gpr 0}, 2\n`;
|
|
` lwzx {emit_gpr 0}, {emit_gpr 11}, {emit_gpr 0}\n`;
|
|
` add {emit_gpr 0}, {emit_gpr 11}, {emit_gpr 0}\n`;
|
|
` mtctr {emit_gpr 0}\n`;
|
|
` bctr\n`;
|
|
for i = 0 to Array.length jumptbl - 1 do
|
|
jumptbl_entries := jumptbl.(i) :: !jumptbl_entries;
|
|
incr num_jumptbl_entries
|
|
done
|
|
| Lsetuptrap lbl ->
|
|
` bl {emit_label lbl}\n`
|
|
| Lpushtrap ->
|
|
stack_offset := !stack_offset + 16;
|
|
` mflr {emit_gpr 0}\n`;
|
|
` stwu {emit_gpr 0}, -16({emit_gpr 1})\n`;
|
|
` stw {emit_gpr 29}, 4({emit_gpr 1})\n`;
|
|
` mr {emit_gpr 29}, {emit_gpr 1}\n`
|
|
| Lpoptrap ->
|
|
` lwz {emit_gpr 29}, 4({emit_gpr 1})\n`;
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, 16\n`;
|
|
stack_offset := !stack_offset - 16
|
|
| Lraise ->
|
|
` lwz {emit_gpr 0}, 0({emit_gpr 29})\n`;
|
|
` mr {emit_gpr 1}, {emit_gpr 29}\n`;
|
|
` mtlr {emit_gpr 0}\n`;
|
|
` lwz {emit_gpr 29}, 4({emit_gpr 1})\n`;
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, 16\n`;
|
|
` blr\n`
|
|
|
|
and emit_delay = function
|
|
None -> ()
|
|
| Some i -> emit_instr i None
|
|
|
|
(* Checks if a pseudo-instruction expands to instructions
|
|
that do not branch and do not affect CR0 nor R12. *)
|
|
|
|
let is_simple_instr i =
|
|
match i.desc with
|
|
Lop op ->
|
|
begin match op with
|
|
Icall_imm _ | Icall_ind | Itailcall_imm _ | Itailcall_ind |
|
|
Iextcall(_, _) -> false
|
|
| Ialloc(_) -> false
|
|
| Iintop(Icomp _) -> false
|
|
| Iintop_imm(Iand, _) -> false
|
|
| Iintop_imm(Icomp _, _) -> false
|
|
| _ -> true
|
|
end
|
|
| Lreloadretaddr -> true
|
|
| _ -> false
|
|
|
|
let no_interference res arg =
|
|
try
|
|
for i = 0 to Array.length arg - 1 do
|
|
for j = 0 to Array.length res - 1 do
|
|
if arg.(i).loc = res.(j).loc then raise Exit
|
|
done
|
|
done;
|
|
true
|
|
with Exit ->
|
|
false
|
|
|
|
(* Emit a sequence of instructions, trying to fill delay slots for branches *)
|
|
|
|
let rec emit_all i =
|
|
match i with
|
|
{desc = Lend} -> ()
|
|
| {next = {desc = (Lcondbranch(_, _) | Lcondbranch3(_, _, _))}}
|
|
when is_simple_instr i & no_interference i.res i.next.arg ->
|
|
emit_instr i.next (Some i);
|
|
emit_all i.next.next
|
|
| _ ->
|
|
emit_instr i None;
|
|
emit_all i.next
|
|
|
|
(* Emission of a function declaration *)
|
|
|
|
let fundecl fundecl =
|
|
function_name := fundecl.fun_name;
|
|
defined_functions := StringSet.add fundecl.fun_name !defined_functions;
|
|
tailrec_entry_point := new_label();
|
|
stack_offset := 0;
|
|
call_gc_label := 0;
|
|
float_literals := [];
|
|
` .globl {emit_symbol fundecl.fun_name}\n`;
|
|
begin match Config.system with
|
|
| "elf" | "bsd" ->
|
|
` .type {emit_symbol fundecl.fun_name}, @function\n`
|
|
| _ -> ()
|
|
end;
|
|
emit_string code_space;
|
|
` .align 2\n`;
|
|
`{emit_symbol fundecl.fun_name}:\n`;
|
|
let n = frame_size() in
|
|
if !contains_calls then begin
|
|
` mflr {emit_gpr 0}\n`;
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int(-n)}\n`;
|
|
` stw {emit_gpr 0}, {emit_int(n - 4)}({emit_gpr 1})\n`
|
|
end else begin
|
|
if n > 0 then
|
|
` addi {emit_gpr 1}, {emit_gpr 1}, {emit_int(-n)}\n`
|
|
end;
|
|
`{emit_label !tailrec_entry_point}:\n`;
|
|
branch_normalization fundecl.fun_body;
|
|
emit_all fundecl.fun_body;
|
|
(* Emit the glue code to call the GC *)
|
|
if !call_gc_label > 0 then begin
|
|
`{emit_label !call_gc_label}:\n`;
|
|
` b {emit_symbol "caml_call_gc"}\n`
|
|
end;
|
|
(* Emit the floating-point literals *)
|
|
if !float_literals <> [] then begin
|
|
emit_string rodata_space;
|
|
` .align 3\n`;
|
|
List.iter
|
|
(fun (f, lbl) ->
|
|
`{emit_label lbl}: .double 0d{emit_string f}\n`)
|
|
!float_literals
|
|
end
|
|
|
|
(* Emission of data *)
|
|
|
|
let declare_global_data s =
|
|
` .globl {emit_symbol s}\n`;
|
|
if Config.system = "elf" || Config.system = "bsd" then
|
|
` .type {emit_symbol s}, @object\n`
|
|
|
|
let emit_item = function
|
|
Cglobal_symbol s ->
|
|
declare_global_data s
|
|
| Cdefine_symbol s ->
|
|
`{emit_symbol s}:\n`;
|
|
| Cdefine_label lbl ->
|
|
`{emit_label (lbl + 100000)}:\n`
|
|
| Cint8 n ->
|
|
` .byte {emit_int n}\n`
|
|
| Cint16 n ->
|
|
` .short {emit_int n}\n`
|
|
| Cint32 n ->
|
|
` .long {emit_nativeint n}\n`
|
|
| Cint n ->
|
|
` .long {emit_nativeint n}\n`
|
|
| Csingle f ->
|
|
` .float 0d{emit_string f}\n`
|
|
| Cdouble f ->
|
|
` .double 0d{emit_string f}\n`
|
|
| Csymbol_address s ->
|
|
` .long {emit_symbol s}\n`
|
|
| Clabel_address lbl ->
|
|
` .long {emit_label (lbl + 100000)}\n`
|
|
| Cstring s ->
|
|
emit_bytes_directive " .byte " s
|
|
| Cskip n ->
|
|
if n > 0 then ` .space {emit_int n}\n`
|
|
| Calign n ->
|
|
` .align {emit_int (Misc.log2 n)}\n`
|
|
|
|
let data l =
|
|
emit_string data_space;
|
|
List.iter emit_item l
|
|
|
|
(* Beginning / end of an assembly file *)
|
|
|
|
let begin_assembly() =
|
|
defined_functions := StringSet.empty;
|
|
external_functions := StringSet.empty;
|
|
num_jumptbl_entries := 0;
|
|
jumptbl_entries := [];
|
|
lbl_jumptbl := 0;
|
|
(* Emit the beginning of the segments *)
|
|
let lbl_begin = Compilenv.make_symbol (Some "data_begin") in
|
|
emit_string data_space;
|
|
declare_global_data lbl_begin;
|
|
`{emit_symbol lbl_begin}:\n`;
|
|
let lbl_begin = Compilenv.make_symbol (Some "code_begin") in
|
|
emit_string code_space;
|
|
declare_global_data lbl_begin;
|
|
`{emit_symbol lbl_begin}:\n`
|
|
|
|
let end_assembly() =
|
|
(* Emit the jump table *)
|
|
if !num_jumptbl_entries > 0 then begin
|
|
emit_string code_space;
|
|
`{emit_label !lbl_jumptbl}:\n`;
|
|
List.iter
|
|
(fun lbl -> ` .long {emit_label lbl} - {emit_label !lbl_jumptbl}\n`)
|
|
(List.rev !jumptbl_entries);
|
|
jumptbl_entries := []
|
|
end;
|
|
if pic_externals then
|
|
(* Emit the pointers to external functions *)
|
|
StringSet.iter emit_external !external_functions;
|
|
(* Emit the end of the segments *)
|
|
emit_string code_space;
|
|
let lbl_end = Compilenv.make_symbol (Some "code_end") in
|
|
declare_global_data lbl_end;
|
|
`{emit_symbol lbl_end}:\n`;
|
|
emit_string data_space;
|
|
let lbl_end = Compilenv.make_symbol (Some "data_end") in
|
|
declare_global_data lbl_end;
|
|
`{emit_symbol lbl_end}:\n`;
|
|
` .long 0\n`;
|
|
(* Emit the frame descriptors *)
|
|
emit_string rodata_space;
|
|
let lbl = Compilenv.make_symbol (Some "frametable") in
|
|
declare_global_data lbl;
|
|
`{emit_symbol lbl}:\n`;
|
|
` .long {emit_int (List.length !frame_descriptors)}\n`;
|
|
List.iter emit_frame !frame_descriptors;
|
|
frame_descriptors := []
|