Section CONSTRUCTORS.
Variable ge: genv.
Variable fn: function.
(** Decomposition of integer literals *)
Inductive wf_decomposition: list (Z * Z) -> Prop :=
| wf_decomp_nil:
wf_decomposition nil
| wf_decomp_cons: forall m n p l,
n = Zzero_ext 16 m -> 0 <= p -> wf_decomposition l ->
wf_decomposition ((n, p) :: l).
Fixpoint recompose_int (accu: Z) (l: list (Z * Z)) : Z :=
match l with
| nil => accu
| (n, p) :: l => recompose_int (Zinsert accu n p 16) l
end.
(** Add immediate *)
(** Logical immediate *)
(** Load address of symbol *)
(** Shifted operands *)
Remark transl_shift_not_none:
forall s a, transl_shift s a <> SOnone.
Remark or_zero_eval_shift_op_int:
forall v s, s <> SOnone -> Val.or (Vint Int.zero) (eval_shift_op_int v s) = eval_shift_op_int v s.
Remark or_zero_eval_shift_op_long:
forall v s, s <> SOnone -> Val.orl (Vlong Int64.zero) (eval_shift_op_long v s) = eval_shift_op_long v s.
Remark add_zero_eval_shift_op_long:
forall v s, s <> SOnone -> Val.addl (Vlong Int64.zero) (eval_shift_op_long v s) = eval_shift_op_long v s.
(** Zero- and Sign- extensions *)
(** Extended right shift *)

Lemma exec_shrx32: forall (rd r1: ireg) (n: int) k v (rs: regset) m,
Val.shrx rs#r1 (Vint n) = Some v ->
r1 <> X16 ->
exists rs',
exec_straight ge fn (shrx32 rd r1 n k) rs m k rs' m
/\ rs'#rd = v
/\ forall r, data_preg r = true -> r <> rd -> rs'#r = rs#r.