diff options
Diffstat (limited to 'mppa_k1c/ExtValues.v')
-rw-r--r-- | mppa_k1c/ExtValues.v | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/mppa_k1c/ExtValues.v b/mppa_k1c/ExtValues.v index 980e18f8..155afa83 100644 --- a/mppa_k1c/ExtValues.v +++ b/mppa_k1c/ExtValues.v @@ -2,6 +2,42 @@ Require Import Coqlib. Require Import Integers. Require Import Values. +Inductive shift1_4 : Type := +| SHIFT1 | SHIFT2 | SHIFT3 | SHIFT4. + +Definition z_of_shift1_4 (x : shift1_4) := + match x with + | SHIFT1 => 1 + | SHIFT2 => 2 + | SHIFT3 => 3 + | SHIFT4 => 4 + end. + +Definition shift1_4_of_z (x : Z) := + if Z.eq_dec x 1 then Some SHIFT1 + else if Z.eq_dec x 2 then Some SHIFT2 + else if Z.eq_dec x 3 then Some SHIFT3 + else if Z.eq_dec x 4 then Some SHIFT4 + else None. + +Lemma shift1_4_of_z_correct : + forall z, + match shift1_4_of_z z with + | Some x => z_of_shift1_4 x = z + | None => True + end. +Proof. + intro. unfold shift1_4_of_z. + destruct (Z.eq_dec _ _); simpl; try congruence. + destruct (Z.eq_dec _ _); simpl; try congruence. + destruct (Z.eq_dec _ _); simpl; try congruence. + destruct (Z.eq_dec _ _); simpl; try congruence. + trivial. +Qed. + +Definition int_of_shift1_4 (x : shift1_4) := + Int.repr (z_of_shift1_4 x). + Definition is_bitfield stop start := (Z.leb start stop) && (Z.geb start Z.zero) @@ -577,3 +613,61 @@ Proof. } } Qed. + +Lemma sub_add_neg : + forall x y, Val.sub x y = Val.add x (Val.neg y). +Proof. + destruct x; destruct y; simpl; trivial. + f_equal. + apply Int.sub_add_opp. +Qed. + +Lemma neg_mul_distr_r : + forall x y, Val.neg (Val.mul x y) = Val.mul x (Val.neg y). +Proof. + destruct x; destruct y; simpl; trivial. + f_equal. + apply Int.neg_mul_distr_r. +Qed. + +(* pointer diff +Lemma sub_addl_negl : + forall x y, Val.subl x y = Val.addl x (Val.negl y). +Proof. + destruct x; destruct y; simpl; trivial. + + f_equal. apply Int64.sub_add_opp. + + destruct (Archi.ptr64) eqn:ARCHI64; trivial. + f_equal. rewrite Ptrofs.sub_add_opp. + pose (Ptrofs.agree64_neg ARCHI64 (Ptrofs.of_int64 i0) i0) as Hagree. + unfold Ptrofs.agree64 in Hagree. + unfold Ptrofs.add. + f_equal. f_equal. + rewrite Hagree. + pose (Ptrofs.agree64_of_int ARCHI64 (Int64.neg i0)) as Hagree2. + rewrite Hagree2. + reflexivity. + exact (Ptrofs.agree64_of_int ARCHI64 i0). + + destruct (Archi.ptr64) eqn:ARCHI64; simpl; trivial. + destruct (eq_block _ _); simpl; trivial. +Qed. + *) + +Lemma negl_mull_distr_r : + forall x y, Val.negl (Val.mull x y) = Val.mull x (Val.negl y). +Proof. + destruct x; destruct y; simpl; trivial. + f_equal. + apply Int64.neg_mul_distr_r. +Qed. + +Definition addx sh v1 v2 := + Val.add v2 (Val.shl v1 (Vint sh)). + +Definition addxl sh v1 v2 := + Val.addl v2 (Val.shll v1 (Vint sh)). + +Definition revsubx sh v1 v2 := + Val.sub v2 (Val.shl v1 (Vint sh)). + +Definition revsubxl sh v1 v2 := + Val.subl v2 (Val.shll v1 (Vint sh)). |