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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 Decidableplus.
Require Import Maps.
Require Import AST.
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 ([Rxx]).
- Floating-point registers that can be allocated to RTL pseudo-registers
([Fxx]).
The type [mreg] does not include special-purpose or reserved
machine registers such as the stack pointer (GPR1), the small data area
pointers (GPR2, GPR13), and the condition codes. *)
Inductive mreg: Type :=
(** Allocatable integer regs *)
| R3: mreg | R4: mreg | R5: mreg | R6: mreg
| R7: mreg | R8: mreg | R9: mreg | R10: mreg
| R11: mreg | R12: mreg
| R14: mreg | R15: mreg | R16: mreg
| R17: mreg | R18: mreg | R19: mreg | R20: mreg
| R21: mreg | R22: mreg | R23: mreg | R24: mreg
| R25: mreg | R26: mreg | R27: mreg | R28: mreg
| R29: mreg | R30: mreg | R31: mreg
(** Allocatable float regs *)
| F0: mreg
| F1: mreg | F2: mreg | F3: mreg | F4: mreg
| F5: mreg | F6: mreg | F7: mreg | F8: mreg
| F9: mreg | F10: mreg | F11: mreg | F12: mreg
| F13: mreg | F14: mreg | F15: mreg
| F16: mreg | F17: mreg | F18: mreg | F19: mreg
| F20: mreg | F21: mreg | F22: mreg | F23: mreg
| F24: mreg | F25: mreg | F26: mreg | F27: mreg
| F28: mreg | F29: mreg | F30: mreg | F31: mreg.
Lemma mreg_eq: forall (r1 r2: mreg), {r1 = r2} + {r1 <> r2}.
Proof. decide equality. Defined.
Global Opaque mreg_eq.
Definition all_mregs :=
R3 :: R4 :: R5 :: R6 :: R7 :: R8 :: R9 :: R10
:: R11 :: R12 :: R14 :: R15 :: R16 :: R17 :: R18 :: R19 :: R20
:: R21 :: R22 :: R23 :: R24 :: R25 :: R26 :: R27 :: R28
:: R29 :: R30 :: R31
:: F0 :: F1 :: F2 :: F3 :: F4
:: F5 :: F6 :: F7 :: F8
:: F9 :: F10 :: F11 :: F12
:: F13 :: F14 :: F15
:: F16 :: F17 :: F18 :: F19
:: F20 :: F21 :: F22 :: F23
:: F24 :: F25 :: F26 :: F27
:: F28 :: F29 :: F30 :: F31 :: nil.
Lemma all_mregs_complete:
forall (r: mreg), In r all_mregs.
Proof.
assert (forall r, proj_sumbool (In_dec mreg_eq r all_mregs) = true) by (destruct r; reflexivity).
intros. specialize (H r). InvBooleans. auto.
Qed.
Global Instance Decidable_eq_mreg : forall (x y: mreg), Decidable (eq x y) := Decidable_eq mreg_eq.
Global Instance Finite_mreg : Finite mreg := {
Finite_elements := all_mregs;
Finite_elements_spec := all_mregs_complete
}.
Definition mreg_type (r: mreg): typ :=
match r with
| R3 | R4 | R5 | R6 | R7 | R8 | R9 | R10 | R11 | R12
| R14 | R15 | R16 | R17 | R18 | R19 | R20 | R21 | R22 | R23 | R24
| R25 | R26 | R27 | R28 | R29 | R30 | R31 => if Archi.ppc64 then Tany64 else Tany32
| F0 | F1 | F2 | F3 | F4 | F5 | F6 | F7
| F8 | F9 | F10 | F11 | F12 | F13 | F14 | F15
| F16 | F17 | F18 | F19 | F20 | F21 | F22 | F23
| F24 | F25 | F26 | F27 | F28 | F29 | F30 | F31 => Tany64
end.
Open Scope positive_scope.
Module IndexedMreg <: INDEXED_TYPE.
Definition t := mreg.
Definition eq := mreg_eq.
Definition index (r: mreg): positive :=
match r with
| R3 => 1 | R4 => 2 | R5 => 3 | R6 => 4
| R7 => 5 | R8 => 6 | R9 => 7 | R10 => 8
| R11 => 9 | R12 => 10
| R14 => 11 | R15 => 12 | R16 => 13
| R17 => 14 | R18 => 15 | R19 => 16 | R20 => 17
| R21 => 18 | R22 => 19 | R23 => 20 | R24 => 21
| R25 => 22 | R26 => 23 | R27 => 24 | R28 => 25
| R29 => 26 | R30 => 27 | R31 => 28
| F0 => 29
| F1 => 30 | F2 => 31 | F3 => 32 | F4 => 33
| F5 => 34 | F6 => 35 | F7 => 36 | F8 => 37
| F9 => 38 | F10 => 39 | F11 => 40 | F12 => 41
| F13 => 42 | F14 => 43 | F15 => 44
| F16 => 45 | F17 => 46 | F18 => 47 | F19 => 48
| F20 => 49 | F21 => 50 | F22 => 51 | F23 => 52
| F24 => 53 | F25 => 54 | F26 => 55 | F27 => 56
| F28 => 57 | F29 => 58 | F30 => 59 | F31 => 60
end.
Lemma index_inj:
forall r1 r2, index r1 = index r2 -> r1 = r2.
Proof.
decide_goal.
Qed.
End IndexedMreg.
Definition is_stack_reg (r: mreg) : bool := false.
(** ** Names of registers *)
Local Open Scope string_scope.
Definition register_names :=
("R3", R3) :: ("R4", R4) :: ("R5", R5) :: ("R6", R6) ::
("R7", R7) :: ("R8", R8) :: ("R9", R9) :: ("R10", R10) ::
("R11", R11) :: ("R12", R12) ::
("R14", R14) :: ("R15", R15) :: ("R16", R16) ::
("R17", R17) :: ("R18", R18) :: ("R19", R19) :: ("R20", R20) ::
("R21", R21) :: ("R22", R22) :: ("R23", R23) :: ("R24", R24) ::
("R25", R25) :: ("R26", R26) :: ("R27", R27) :: ("R28", R28) ::
("R29", R29) :: ("R30", R30) :: ("R31", R31) ::
("F0", F0) :: ("F1", F1) :: ("F2", F2) :: ("F3", F3) :: ("F4", F4) ::
("F5", F5) :: ("F6", F6) :: ("F7", F7) :: ("F8", F8) ::
("F9", F9) :: ("F10", F10) :: ("F11", F11) :: ("F12", F12) ::
("F13", F13) :: ("F14", F14) :: ("F15", F15) ::
("F16", F16) :: ("F17", F17) :: ("F18", F18) :: ("F19", F19) ::
("F20", F20) :: ("F21", F21) :: ("F22", F22) :: ("F23", F23) ::
("F24", F24) :: ("F25", F25) :: ("F26", F26) :: ("F27", F27) ::
("F28", F28) :: ("F29", F29) :: ("F30", F30) :: ("F31", F31) :: nil.
Definition register_by_name (s: string) : option mreg :=
let fix assoc (l: list (string * mreg)) : option mreg :=
match l with
| nil => None
| (s1, r1) :: l' => if string_dec s s1 then Some r1 else assoc l'
end
in assoc register_names.
(** ** Destroyed registers, preferred registers *)
Definition destroyed_by_cond (cond: condition): list mreg := nil.
Definition destroyed_by_op (op: operation): list mreg :=
match op with
| Ofloatconst _ => R12 :: nil
| Osingleconst _ => R12 :: nil
| Olongconst _ => R12 :: nil
| Ointoffloat => F13 :: nil
| Olongoffloat => F13 :: nil
| Oaddlimm _ => R12 :: nil
| Oandlimm _ => R12 :: nil
| Oorlimm _ => R12 :: nil
| Oxorlimm _ => R12 :: nil
| Orolml _ _ => R12 :: nil
| Ocmp c => destroyed_by_cond c
| _ => nil
end.
Definition destroyed_by_load (chunk: memory_chunk) (addr: addressing): list mreg :=
R12 :: nil.
Definition destroyed_by_store (chunk: memory_chunk) (addr: addressing): list mreg :=
R11 :: R12 :: nil.
Definition destroyed_by_jumptable: list mreg :=
R12 :: nil.
Fixpoint destroyed_by_clobber (cl: list string): list mreg :=
match cl with
| nil => nil
| c1 :: cl =>
match register_by_name c1 with
| Some r => r :: destroyed_by_clobber cl
| None => destroyed_by_clobber cl
end
end.
Definition destroyed_by_builtin (ef: external_function): list mreg :=
match ef with
| EF_builtin id sg =>
if string_dec id "__builtin_set_spr64" then R10::nil
else if string_dec id "__builtin_atomic_exchange" then R10::nil
else if string_dec id "__builtin_atomic_compare_exchange" then R10::R11::nil
else F13 :: nil
| EF_vload _ => R11 :: nil
| EF_vstore Mint64 => R10 :: R11 :: R12 :: nil
| EF_vstore _ => R11 :: R12 :: nil
| EF_memcpy _ _ => R11 :: R12 :: F13 :: nil
| EF_inline_asm txt sg clob => destroyed_by_clobber clob
| _ => nil
end.
Definition destroyed_by_setstack (ty: typ): list mreg :=
nil.
Definition destroyed_at_function_entry: list mreg :=
nil.
Definition destroyed_at_indirect_call: list mreg :=
nil.
Definition temp_for_parent_frame: mreg :=
R11.
Definition mregs_for_operation (op: operation): list (option mreg) * option mreg :=
(nil, None).
Definition mregs_for_builtin (ef: external_function): list (option mreg) * list (option mreg) :=
match ef with
| EF_builtin id sg =>
if string_dec id "__builtin_atomic_exchange" then ((Some R3)::(Some R4)::(Some R5)::nil,nil)
else if string_dec id "__builtin_sync_fetch_and_add" then ((Some R4)::(Some R5)::nil,(Some R3)::nil)
else if string_dec id "__builtin_atomic_compare_exchange" then ((Some R4)::(Some R5)::(Some R6)::nil, (Some R3):: 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_at_indirect_call
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
| Oroli _ _ => true
| Olowlong => true
| Ofloatofsingle => true
| _ => false
end.
(* Constraints on constant propagation for builtins *)
Definition builtin_constraints (ef: external_function) :
list builtin_arg_constraint :=
match ef with
| EF_builtin id sg =>
if string_dec id "__builtin_get_spr" then OK_const :: nil
else if string_dec id "__builtin_get_spr64" then OK_const :: nil
else if string_dec id "__builtin_set_spr" then OK_const :: OK_default :: nil
else if string_dec id "__builtin_set_spr64" then OK_const :: OK_default :: nil
else if string_dec id "__builtin_prefetch" then OK_default :: OK_const :: OK_const :: nil
else if string_dec id "__builtin_dcbtls" then OK_default :: OK_const :: nil
else if string_dec id "__builtin_icbtls" then OK_default :: OK_const :: nil
else if string_dec id "__builtin_mbar" then OK_const :: nil
else if string_dec id "__builtin_mr" then OK_const :: OK_const :: nil
else nil
| EF_vload _ => OK_addressing :: nil
| EF_vstore _ => OK_addressing :: OK_default :: nil
| EF_memcpy _ _ => OK_addrstack :: OK_addrstack :: nil
| EF_annot kind txt targs => map (fun _ => OK_all) targs
| EF_debug kind txt targs => map (fun _ => OK_all) targs
| _ => nil
end.
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