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(* *********************************************************************)
(* *)
(* The Compcert verified compiler *)
(* *)
(* Xavier Leroy, INRIA Paris-Rocquencourt *)
(* *)
(* Copyright Institut National de Recherche en Informatique et en *)
(* Automatique. All rights reserved. This file is distributed *)
(* under the terms of the INRIA Non-Commercial License Agreement. *)
(* *)
(* *********************************************************************)
Require Import String.
Require Import Coqlib.
Require Import Maps.
Require Import AST.
Require Import Integers.
Require Import Op.
(** ** Machine registers *)
(** The following type defines the machine registers that can be referenced
as locations. These include:
- Integer registers that can be allocated to RTL pseudo-registers.
- Floating-point registers that can be allocated to RTL pseudo-registers.
- The special [FP0] register denoting the top of the X87 float stack.
The type [mreg] does not include special-purpose or reserved
machine registers such as the stack pointer and the condition codes. *)
Inductive mreg: Type :=
(** Allocatable integer regs *)
| AX: mreg | BX: mreg | CX: mreg | DX: mreg | SI: mreg | DI: mreg | BP: mreg
(** Allocatable float regs *)
| X0: mreg | X1: mreg | X2: mreg | X3: mreg
| X4: mreg | X5: mreg | X6: mreg | X7: mreg
(** Special float reg *)
| FP0: mreg (**r top of x87 FP stack *).
Lemma mreg_eq: forall (r1 r2: mreg), {r1 = r2} + {r1 <> r2}.
Proof. decide equality. Defined.
Global Opaque mreg_eq.
Definition mreg_type (r: mreg): typ :=
match r with
| AX => Tint | BX => Tint | CX => Tint | DX => Tint
| SI => Tint | DI => Tint | BP => Tint
| X0 => Tfloat | X1 => Tfloat | X2 => Tfloat | X3 => Tfloat
| X4 => Tfloat | X5 => Tfloat | X6 => Tfloat | X7 => Tfloat
| FP0 => Tfloat
end.
Local Open Scope positive_scope.
Module IndexedMreg <: INDEXED_TYPE.
Definition t := mreg.
Definition eq := mreg_eq.
Definition index (r: mreg): positive :=
match r with
| AX => 1 | BX => 2 | CX => 3 | DX => 4 | SI => 5 | DI => 6 | BP => 7
| X0 => 8 | X1 => 9 | X2 => 10 | X3 => 11
| X4 => 12 | X5 => 13 | X6 => 14 | X7 => 15
| FP0 => 16
end.
Lemma index_inj:
forall r1 r2, index r1 = index r2 -> r1 = r2.
Proof.
destruct r1; destruct r2; simpl; intro; discriminate || reflexivity.
Qed.
End IndexedMreg.
Definition is_stack_reg (r: mreg) : bool :=
match r with FP0 => true | _ => false end.
(** ** Destroyed registers, preferred registers *)
Definition destroyed_by_op (op: operation): list mreg :=
match op with
| Omove => FP0 :: nil
| Ocast8signed | Ocast8unsigned | Ocast16signed | Ocast16unsigned => AX :: nil
| Omulhs => AX :: DX :: nil
| Omulhu => AX :: DX :: nil
| Odiv => AX :: DX :: nil
| Odivu => AX :: DX :: nil
| Omod => AX :: DX :: nil
| Omodu => AX :: DX :: nil
| Oshrximm _ => CX :: nil
| Ocmp _ => AX :: CX :: nil
| _ => nil
end.
Definition destroyed_by_load (chunk: memory_chunk) (addr: addressing): list mreg :=
nil.
Definition destroyed_by_store (chunk: memory_chunk) (addr: addressing): list mreg :=
match chunk with
| Mint8signed | Mint8unsigned => AX :: CX :: nil
| Mint16signed | Mint16unsigned | Mint32 | Mint64 => nil
| Mfloat32 => X7 :: nil
| Mfloat64 => FP0 :: nil
end.
Definition destroyed_by_cond (cond: condition): list mreg :=
nil.
Definition destroyed_by_jumptable: list mreg :=
nil.
Local Open Scope string_scope.
Definition builtin_write16_reversed := ident_of_string "__builtin_write16_reversed".
Definition builtin_write32_reversed := ident_of_string "__builtin_write32_reversed".
Definition destroyed_by_builtin (ef: external_function): list mreg :=
match ef with
| EF_memcpy sz al =>
if zle sz 32 then CX :: X7 :: nil else CX :: SI :: DI :: nil
| EF_vstore (Mint8unsigned|Mint8signed) => AX :: CX :: nil
| EF_vstore Mfloat32 => X7 :: nil
| EF_vstore_global (Mint8unsigned|Mint8signed) _ _ => AX :: nil
| EF_vstore_global Mfloat32 _ _ => X7 :: nil
| EF_builtin id sg =>
if ident_eq id builtin_write16_reversed
|| ident_eq id builtin_write32_reversed
then CX :: DX :: nil else nil
| _ => nil
end.
Definition destroyed_at_function_entry: list mreg :=
DX :: FP0 :: nil. (* must include destroyed_by_op Omove *)
Definition destroyed_by_setstack (ty: typ): list mreg :=
match ty with
| Tfloat => FP0 :: nil
| Tsingle => X7 :: FP0 :: nil
| _ => nil
end.
Definition temp_for_parent_frame: mreg :=
DX.
Definition mregs_for_operation (op: operation): list (option mreg) * option mreg :=
match op with
| Omulhs => (Some AX :: None :: nil, Some DX)
| Omulhu => (Some AX :: None :: nil, Some DX)
| Odiv => (Some AX :: Some CX :: nil, Some AX)
| Odivu => (Some AX :: Some CX :: nil, Some AX)
| Omod => (Some AX :: Some CX :: nil, Some DX)
| Omodu => (Some AX :: Some CX :: nil, Some DX)
| Oshl => (None :: Some CX :: nil, None)
| Oshr => (None :: Some CX :: nil, None)
| Oshru => (None :: Some CX :: nil, None)
| Oshrximm _ => (Some AX :: nil, Some AX)
| _ => (nil, None)
end.
Definition builtin_negl := ident_of_string "__builtin_negl".
Definition builtin_addl := ident_of_string "__builtin_addl".
Definition builtin_subl := ident_of_string "__builtin_subl".
Definition builtin_mull := ident_of_string "__builtin_mull".
Definition mregs_for_builtin (ef: external_function): list (option mreg) * list (option mreg) :=
match ef with
| EF_memcpy sz al =>
if zle sz 32 then (Some AX :: Some DX :: nil, nil) else (Some DI :: Some SI :: nil, nil)
| EF_builtin id sg =>
if ident_eq id builtin_negl then
(Some DX :: Some AX :: nil, Some DX :: Some AX :: nil)
else if ident_eq id builtin_addl || ident_eq id builtin_subl then
(Some DX :: Some AX :: Some CX :: Some BX :: nil, Some DX :: Some AX :: nil)
else if ident_eq id builtin_mull then
(Some AX :: Some DX :: nil, Some DX :: Some AX :: nil)
else
(nil, nil)
| _ => (nil, nil)
end.
Global Opaque
destroyed_by_op destroyed_by_load destroyed_by_store
destroyed_by_cond destroyed_by_jumptable destroyed_by_builtin
destroyed_by_setstack destroyed_at_function_entry temp_for_parent_frame
mregs_for_operation mregs_for_builtin.
(** Two-address operations. Return [true] if the first argument and
the result must be in the same location *and* are unconstrained
by [mregs_for_operation]. *)
Definition two_address_op (op: operation) : bool :=
match op with
| Omove => false
| Ointconst _ => false
| Ofloatconst _ => false
| Oindirectsymbol _ => false
| Ocast8signed => false
| Ocast8unsigned => false
| Ocast16signed => false
| Ocast16unsigned => false
| Oneg => true
| Osub => true
| Omul => true
| Omulimm _ => true
| Omulhs => false
| Omulhu => false
| Odiv => false
| Odivu => false
| Omod => false
| Omodu => false
| Oand => true
| Oandimm _ => true
| Oor => true
| Oorimm _ => true
| Oxor => true
| Oxorimm _ => true
| Onot => true
| Oshl => true
| Oshlimm _ => true
| Oshr => true
| Oshrimm _ => true
| Oshrximm _ => false
| Oshru => true
| Oshruimm _ => true
| Ororimm _ => true
| Oshldimm _ => true
| Olea addr => false
| Onegf => true
| Oabsf => true
| Oaddf => true
| Osubf => true
| Omulf => true
| Odivf => true
| Osingleoffloat => false
| Ointoffloat => false
| Ofloatofint => false
| Omakelong => false
| Olowlong => false
| Ohighlong => false
| Ocmp c => false
end.
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