diff options
Diffstat (limited to 'powerpc/SelectOpproof.v')
| -rw-r--r-- | powerpc/SelectOpproof.v | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/powerpc/SelectOpproof.v b/powerpc/SelectOpproof.v index 8ad9807..cc14d33 100644 --- a/powerpc/SelectOpproof.v +++ b/powerpc/SelectOpproof.v @@ -343,6 +343,21 @@ Theorem eval_andimm: Proof. intros; red; intros until x. unfold andimm. case (andimm_match a); intros. InvEval. TrivialExists. simpl. rewrite Int.and_commut; auto. + set (n' := Int.and n n2). + destruct (Int.eq (Int.shru (Int.shl n' amount) amount) n' && + Int.ltu amount Int.iwordsize) as []_eqn. + InvEval. destruct (andb_prop _ _ Heqb). + generalize (Int.eq_spec (Int.shru (Int.shl n' amount) amount) n'). rewrite H1; intros. + replace (Val.and x (Vint n)) + with (Val.rolm v0 (Int.sub Int.iwordsize amount) (Int.and (Int.shru Int.mone amount) n')). + apply eval_rolm; auto. + subst. destruct v0; simpl; auto. rewrite H3. simpl. decEq. rewrite Int.and_assoc. + rewrite (Int.and_commut n2 n). + transitivity (Int.and (Int.shru i amount) (Int.and n n2)). + rewrite (Int.shru_rolm i); auto. unfold Int.rolm. rewrite Int.and_assoc; auto. + symmetry. apply Int.shr_and_shru_and. auto. + set (e2 := Eop (Oshrimm amount) (t2 ::: Enil)) in *. + InvEval. subst. rewrite Val.and_assoc. simpl. rewrite Int.and_commut. TrivialExists. InvEval. subst. rewrite Val.and_assoc. simpl. rewrite Int.and_commut. TrivialExists. InvEval. subst. TrivialExists. simpl. destruct v1; auto. simpl. unfold Int.rolm. rewrite Int.and_assoc. |