diff options
Diffstat (limited to 'arm/Conventions1.v')
| -rw-r--r-- | arm/Conventions1.v | 238 |
1 files changed, 18 insertions, 220 deletions
diff --git a/arm/Conventions1.v b/arm/Conventions1.v index c5277e8d..fe49a781 100644 --- a/arm/Conventions1.v +++ b/arm/Conventions1.v @@ -104,13 +104,12 @@ Definition is_float_reg (r: mreg): bool := representation with a single LDM instruction. *) Definition loc_result (s: signature) : rpair mreg := - match s.(sig_res) with - | None => One R0 - | Some (Tint | Tany32) => One R0 - | Some (Tfloat | Tsingle | Tany64) => One F0 - | Some Tlong => if Archi.big_endian - then Twolong R0 R1 - else Twolong R1 R0 + match proj_sig_res s with + | Tint | Tany32 => One R0 + | Tfloat | Tsingle | Tany64 => One F0 + | Tlong => if Archi.big_endian + then Twolong R0 R1 + else Twolong R1 R0 end. (** The result registers have types compatible with that given in the signature. *) @@ -119,7 +118,7 @@ Lemma loc_result_type: forall sig, subtype (proj_sig_res sig) (typ_rpair mreg_type (loc_result sig)) = true. Proof. - intros. unfold proj_sig_res, loc_result. destruct (sig_res sig) as [[]|]; destruct Archi.big_endian; auto. + intros. unfold loc_result. destruct (proj_sig_res sig); destruct Archi.big_endian; auto. Qed. (** The result locations are caller-save registers *) @@ -129,7 +128,7 @@ Lemma loc_result_caller_save: forall_rpair (fun r => is_callee_save r = false) (loc_result s). Proof. intros. - unfold loc_result. destruct (sig_res s) as [[]|]; destruct Archi.big_endian; simpl; auto. + unfold loc_result. destruct (proj_sig_res s); destruct Archi.big_endian; simpl; auto. Qed. (** If the result is in a pair of registers, those registers are distinct and have type [Tint] at least. *) @@ -139,14 +138,13 @@ Lemma loc_result_pair: match loc_result sg with | One _ => True | Twolong r1 r2 => - r1 <> r2 /\ sg.(sig_res) = Some Tlong + r1 <> r2 /\ proj_sig_res sg = Tlong /\ subtype Tint (mreg_type r1) = true /\ subtype Tint (mreg_type r2) = true /\ Archi.ptr64 = false end. Proof. - intros; unfold loc_result; destruct (sig_res sg) as [[]|]; destruct Archi.big_endian; auto. - intuition congruence. - intuition congruence. + intros; unfold loc_result; destruct (proj_sig_res sg); auto. + destruct Archi.big_endian; intuition congruence. Qed. (** The location of the result depends only on the result part of the signature *) @@ -154,7 +152,7 @@ Qed. Lemma loc_result_exten: forall s1 s2, s1.(sig_res) = s2.(sig_res) -> loc_result s1 = loc_result s2. Proof. - intros. unfold loc_result. rewrite H; auto. + intros. unfold loc_result, proj_sig_res. rewrite H; auto. Qed. (** ** Location of function arguments *) @@ -271,48 +269,6 @@ Definition loc_arguments (s: signature) : list (rpair loc) := else loc_arguments_hf s.(sig_args) 0 0 0 end. -(** [size_arguments s] returns the number of [Outgoing] slots used - to call a function with signature [s]. *) - -Fixpoint size_arguments_hf (tyl: list typ) (ir fr ofs: Z) {struct tyl} : Z := - match tyl with - | nil => ofs - | (Tint|Tany32) :: tys => - if zlt ir 4 - then size_arguments_hf tys (ir + 1) fr ofs - else size_arguments_hf tys ir fr (ofs + 1) - | (Tfloat|Tany64) :: tys => - if zlt fr 8 - then size_arguments_hf tys ir (fr + 1) ofs - else size_arguments_hf tys ir fr (align ofs 2 + 2) - | Tsingle :: tys => - if zlt fr 8 - then size_arguments_hf tys ir (fr + 1) ofs - else size_arguments_hf tys ir fr (ofs + 1) - | Tlong :: tys => - let ir := align ir 2 in - if zlt ir 4 - then size_arguments_hf tys (ir + 2) fr ofs - else size_arguments_hf tys ir fr (align ofs 2 + 2) - end. - -Fixpoint size_arguments_sf (tyl: list typ) (ofs: Z) {struct tyl} : Z := - match tyl with - | nil => Z.max 0 ofs - | (Tint | Tsingle | Tany32) :: tys => size_arguments_sf tys (ofs + 1) - | (Tfloat | Tlong | Tany64) :: tys => size_arguments_sf tys (align ofs 2 + 2) - end. - -Definition size_arguments (s: signature) : Z := - match Archi.abi with - | Archi.Softfloat => - size_arguments_sf s.(sig_args) (-4) - | Archi.Hardfloat => - if s.(sig_cc).(cc_vararg) - then size_arguments_sf s.(sig_args) (-4) - else size_arguments_hf s.(sig_args) 0 0 0 - end. - (** Argument locations are either non-temporary registers or [Outgoing] stack slots at nonnegative offsets. *) @@ -473,173 +429,15 @@ Qed. Hint Resolve loc_arguments_acceptable: locs. -(** The offsets of [Outgoing] arguments are below [size_arguments s]. *) - -Remark size_arguments_hf_above: - forall tyl ir fr ofs0, - ofs0 <= size_arguments_hf tyl ir fr ofs0. -Proof. - induction tyl; simpl; intros. - omega. - destruct a. - destruct (zlt ir 4); eauto. apply Z.le_trans with (ofs0 + 1); auto; omega. - destruct (zlt fr 8); eauto. - apply Z.le_trans with (align ofs0 2). apply align_le; omega. - apply Z.le_trans with (align ofs0 2 + 2); auto; omega. - set (ir' := align ir 2). - destruct (zlt ir' 4); eauto. - apply Z.le_trans with (align ofs0 2). apply align_le; omega. - apply Z.le_trans with (align ofs0 2 + 2); auto; omega. - destruct (zlt fr 8); eauto. - apply Z.le_trans with (ofs0 + 1); eauto. omega. - destruct (zlt ir 4); eauto. apply Z.le_trans with (ofs0 + 1); auto; omega. - destruct (zlt fr 8); eauto. - apply Z.le_trans with (align ofs0 2). apply align_le; omega. - apply Z.le_trans with (align ofs0 2 + 2); auto; omega. -Qed. - -Remark size_arguments_sf_above: - forall tyl ofs0, - Z.max 0 ofs0 <= size_arguments_sf tyl ofs0. -Proof. - induction tyl; simpl; intros. - omega. - destruct a; (eapply Z.le_trans; [idtac|eauto]). - xomega. - assert (ofs0 <= align ofs0 2) by (apply align_le; omega). xomega. - assert (ofs0 <= align ofs0 2) by (apply align_le; omega). xomega. - xomega. - xomega. - assert (ofs0 <= align ofs0 2) by (apply align_le; omega). xomega. -Qed. - -Lemma size_arguments_above: - forall s, size_arguments s >= 0. -Proof. - intros; unfold size_arguments. apply Z.le_ge. - assert (0 <= size_arguments_sf (sig_args s) (-4)). - { change 0 with (Z.max 0 (-4)). apply size_arguments_sf_above. } - assert (0 <= size_arguments_hf (sig_args s) 0 0 0). - { apply size_arguments_hf_above. } - destruct Archi.abi; [ | destruct (cc_vararg (sig_cc s)) ]; auto. -Qed. - -Lemma loc_arguments_hf_bounded: - forall ofs ty tyl ir fr ofs0, - In (S Outgoing ofs ty) (regs_of_rpairs (loc_arguments_hf tyl ir fr ofs0)) -> - ofs + typesize ty <= size_arguments_hf tyl ir fr ofs0. -Proof. - induction tyl; simpl; intros. - elim H. - destruct a. -- (* int *) - destruct (zlt ir 4); destruct H. - discriminate. - eauto. - inv H. apply size_arguments_hf_above. - eauto. -- (* float *) - destruct (zlt fr 8); destruct H. - discriminate. - eauto. - inv H. apply size_arguments_hf_above. - eauto. -- (* long *) - destruct (zlt (align ir 2) 4). - destruct H. discriminate. destruct H. discriminate. eauto. - destruct Archi.big_endian. - destruct H. inv H. - eapply Z.le_trans. 2: apply size_arguments_hf_above. simpl; omega. - destruct H. inv H. - rewrite <- Z.add_assoc. simpl. apply size_arguments_hf_above. - eauto. - destruct H. inv H. - rewrite <- Z.add_assoc. simpl. apply size_arguments_hf_above. - destruct H. inv H. - eapply Z.le_trans. 2: apply size_arguments_hf_above. simpl; omega. - eauto. -- (* float *) - destruct (zlt fr 8); destruct H. - discriminate. - eauto. - inv H. apply size_arguments_hf_above. - eauto. -- (* any32 *) - destruct (zlt ir 4); destruct H. - discriminate. - eauto. - inv H. apply size_arguments_hf_above. - eauto. -- (* any64 *) - destruct (zlt fr 8); destruct H. - discriminate. - eauto. - inv H. apply size_arguments_hf_above. - eauto. -Qed. - -Lemma loc_arguments_sf_bounded: - forall ofs ty tyl ofs0, - In (S Outgoing ofs ty) (regs_of_rpairs (loc_arguments_sf tyl ofs0)) -> - Z.max 0 (ofs + typesize ty) <= size_arguments_sf tyl ofs0. -Proof. - induction tyl; simpl; intros. - elim H. - destruct a. -- (* int *) - destruct H. - destruct (zlt ofs0 0); inv H. apply size_arguments_sf_above. - eauto. -- (* float *) - destruct H. - destruct (zlt (align ofs0 2) 0); inv H. apply size_arguments_sf_above. - eauto. -- (* long *) - destruct H. - destruct Archi.big_endian. - destruct (zlt (align ofs0 2) 0); inv H. - eapply Z.le_trans. 2: apply size_arguments_sf_above. simpl; xomega. - destruct (zlt (align ofs0 2) 0); inv H. - rewrite <- Z.add_assoc. simpl. apply size_arguments_sf_above. - destruct H. - destruct Archi.big_endian. - destruct (zlt (align ofs0 2) 0); inv H. - rewrite <- Z.add_assoc. simpl. apply size_arguments_sf_above. - destruct (zlt (align ofs0 2) 0); inv H. - eapply Z.le_trans. 2: apply size_arguments_sf_above. simpl; xomega. - eauto. -- (* float *) - destruct H. - destruct (zlt ofs0 0); inv H. apply size_arguments_sf_above. - eauto. -- (* any32 *) - destruct H. - destruct (zlt ofs0 0); inv H. apply size_arguments_sf_above. - eauto. -- (* any64 *) - destruct H. - destruct (zlt (align ofs0 2) 0); inv H. apply size_arguments_sf_above. - eauto. -Qed. - -Lemma loc_arguments_bounded: - forall (s: signature) (ofs: Z) (ty: typ), - In (S Outgoing ofs ty) (regs_of_rpairs (loc_arguments s)) -> - ofs + typesize ty <= size_arguments s. -Proof. - unfold loc_arguments, size_arguments; intros. - assert (In (S Outgoing ofs ty) (regs_of_rpairs (loc_arguments_sf (sig_args s) (-4))) -> - ofs + typesize ty <= size_arguments_sf (sig_args s) (-4)). - { intros. eapply Z.le_trans. 2: eapply loc_arguments_sf_bounded; eauto. xomega. } - assert (In (S Outgoing ofs ty) (regs_of_rpairs (loc_arguments_hf (sig_args s) 0 0 0)) -> - ofs + typesize ty <= size_arguments_hf (sig_args s) 0 0 0). - { intros. eapply loc_arguments_hf_bounded; eauto. } - destruct Archi.abi; [ | destruct (cc_vararg (sig_cc s)) ]; eauto. -Qed. - Lemma loc_arguments_main: loc_arguments signature_main = nil. Proof. unfold loc_arguments. destruct Archi.abi; reflexivity. Qed. + +(** ** Normalization of function results *) + +(** No normalization needed. *) + +Definition return_value_needs_normalization (t: rettype) := false. |