238 lines
7.1 KiB
OCaml
238 lines
7.1 KiB
OCaml
(***********************************************************************)
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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 2000 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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(* Description of the AMD64 processor with Win64 conventions *)
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open Misc
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open Arch
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open Cmm
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open Reg
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open Mach
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(* Registers available for register allocation *)
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(* Register map:
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rax 0 rax - r11: Caml function arguments
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rbx 1 rcx - r9: C function arguments
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rdi 2 rax: Caml and C function results
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rsi 3 rbx, rbp, rsi, rdi r12-r15 are preserved by C
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rdx 4
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rcx 5
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r8 6
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r9 7
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r10 8
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r11 9
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rbp 10
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r12 11
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r13 12
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r14 trap pointer
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r15 allocation pointer
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xmm0 - xmm15 100 - 115 xmm0 - xmm9: Caml function arguments
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xmm0 - xmm3: C function arguments
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xmm0: Caml and C function results
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xmm6-xmm15 are preserved by C *)
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let int_reg_name =
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[| "rax"; "rbx"; "rdi"; "rsi"; "rdx"; "rcx"; "r8"; "r9";
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"r10"; "r11"; "rbp"; "r12"; "r13" |]
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let float_reg_name =
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[| "xmm0"; "xmm1"; "xmm2"; "xmm3"; "xmm4"; "xmm5"; "xmm6"; "xmm7";
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"xmm8"; "xmm9"; "xmm10"; "xmm11"; "xmm12"; "xmm13"; "xmm14"; "xmm15" |]
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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 = [| 13; 16 |]
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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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(* Pack registers starting at %rax so as to reduce the number of REX
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prefixes and thus improve code density *)
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let rotate_registers = false
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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 13 Reg.dummy in
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for i = 0 to 12 do v.(i) <- Reg.at_location Int (Reg i) done;
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v
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let hard_float_reg =
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let v = Array.create 16 Reg.dummy in
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for i = 0 to 15 do v.(i) <- Reg.at_location Float (Reg (100 + i)) 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 rax = phys_reg 0
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let rcx = phys_reg 5
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let rdx = phys_reg 4
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let r11 = phys_reg 9
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let rxmm15 = phys_reg 115
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let stack_slot slot ty =
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Reg.at_location ty (Stack slot)
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(* Instruction selection *)
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let word_addressed = false
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(* Calling conventions *)
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let calling_conventions first_int last_int first_float last_float make_stack
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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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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) (* 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 9 100 109 outgoing arg
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let loc_parameters arg =
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let (loc, ofs) = calling_conventions 0 9 100 109 incoming arg in loc
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let loc_results res =
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let (loc, ofs) = calling_conventions 0 0 100 100 not_supported res in loc
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(* C calling conventions (Win64):
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first integer args in rcx, rdx, r8, r9 (4 - 7)
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first float args in xmm0 ... xmm3 (100 - 103)
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each integer arg consumes a float reg, and conversely
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remaining args on stack
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always 32 bytes reserved at bottom of stack.
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Return value in rax or xmm0
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*)
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let loc_external_results res =
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let (loc, ofs) = calling_conventions 0 0 100 100 not_supported res in loc
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let int_external_arguments =
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[| 5 (*rcx*); 4 (*rdx*); 6 (*r8*); 7 (*r9*) |]
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let float_external_arguments =
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[| 100 (*xmm0*); 101 (*xmm1*); 102 (*xmm2*); 103 (*xmm3*) |]
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let loc_external_arguments arg =
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let loc = Array.create (Array.length arg) Reg.dummy in
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let reg = ref 0
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and ofs = ref 32 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 !reg < 4 then begin
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loc.(i) <- phys_reg int_external_arguments.(!reg);
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incr reg
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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 !reg < 4 then begin
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loc.(i) <- phys_reg float_external_arguments.(!reg);
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incr reg
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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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done;
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(loc, Misc.align !ofs 16) (* keep stack 16-aligned *)
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let loc_exn_bucket = rax
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(* Registers destroyed by operations *)
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let destroyed_at_c_call =
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(* Win64: rbx, rbp, rsi, rdi, r12-r15, xmm6-xmm15 preserved *)
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Array.of_list(List.map phys_reg
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[0;4;5;6;7;8;9;
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100;101;102;103;104;105])
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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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| Iop(Iintop(Idiv | Imod)) -> [| rax; rdx |]
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| Iop(Istore(Single, _)) -> [| rxmm15 |]
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| Iop(Ialloc _ | Iintop(Icomp _) | Iintop_imm((Idiv|Imod|Icomp _), _))
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-> [| rax |]
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| Iswitch(_, _) when !pic_code -> [| r11 |]
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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(_,_) -> 8
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| _ -> 11
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let max_register_pressure = function
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Iextcall(_, _) -> [| 8; 10 |]
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| Iintop(Idiv | Imod) -> [| 11; 16 |]
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| Ialloc _ | Iintop(Icomp _) | Iintop_imm((Idiv|Imod|Icomp _), _)
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-> [| 12; 16 |]
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| Istore(Single, _) -> [| 13; 15 |]
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| _ -> [| 13; 16 |]
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(* Layout of the stack frame *)
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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 ("ml64 /nologo /Cp /c /Fo" ^
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Filename.quote outfile ^ " " ^
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Filename.quote infile ^ "> NUL")
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(* /Cp preserve case of all used identifiers
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/c assemble only
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/Fo output file name *)
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