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default Order dec
$include <prelude.sail>
val bitvector_cast_in = "zeroExtend" : forall 'n. bits('n) -> bits('n) effect pure
val bitvector_cast_out = "zeroExtend" : forall 'n. bits('n) -> bits('n) effect pure
val foo : forall 'm 'n, 'm in {8,16} & 'n in {16,32,64}. (implicit('n), bits('m)) -> option(bits('n)) effect pure
function foo(n, x) =
let y : bits(16) = sail_zero_extend(x,16) in
match 'n {
16 => None(),
32 => Some(y@y),
64 => let z = y@y@y@y in let dfsf = 4 in Some(z)
}
union Result ('a : Type) = {
Value : ('a, int),
Complaint : string
}
/* Getting ahead of myself: the 2*'n isn't supported yet, although shouldn't it end up in the form below?
*/
val bar : forall 'n, 'n in {8,16,32}. bits('n) -> Result(bits(2*'n))
function bar(x) =
match 'n {
8 => Complaint("No bytes"),
16 => Value(x@x, unsigned(x)),
32 => Value(sail_sign_extend(x,64), unsigned(x))
}
/*
val bar : forall 'n 'm, 'n in {8,16,32} & 'm == 2*'n. bits('n) -> Result(bits('m))
function bar(x) =
match 'n {
8 => Complaint("No bytes"),
16 => Value(x@x, unsigned(x)),
32 => Value(sail_sign_extend(x,64), unsigned(x))
}
*/
val cmp : forall 'n. (option(bits('n)), option(bits('n))) -> bool
function cmp (None(),None()) = true
and cmp (None(),Some(_)) = false
and cmp (Some(_),None()) = false
and cmp (Some(x),Some(y)) = x == y
overload operator == = {cmp}
val run : unit -> unit effect {escape}
function run() = {
assert((foo(0x12) : option(bits(16))) == None());
assert((foo(0x12) : option(bits(32))) == Some(0x00120012));
assert((foo(0x12) : option(bits(64))) == Some(0x0012001200120012));
}
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