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Vl-datatype-packedp

Decide whether the datatype is packed or not.

Signature

(vl-datatype-packedp x) → packedp

Arguments

x — Guard (vl-datatype-p x).

A shallow check; e.g. we don't check for invalid things such as a packed struct with a member that's an unpacked array.

Note that the question of whether something is packed is subtly different from the question of whether you can select from it: namely, simple bit types such as logic are packed but not selectable.

Definitions and Theorems

Function: vl-datatype-packedp

(defun
   vl-datatype-packedp (x)
   (declare (xargs :guard (vl-datatype-p x)))
   (declare (xargs :guard (vl-datatype-resolved-p x)))
   (let ((__function__ 'vl-datatype-packedp))
        (declare (ignorable __function__))
        (b* ((x (vl-maybe-usertype-resolve x))
             ((when (consp (vl-datatype->udims x)))
              nil)
             ((when (consp (vl-datatype->pdims x)))
              t))
            (vl-datatype-case
                 x
                 :vl-coretype (b* (((vl-coredatatype-info xinfo)
                                    (vl-coretypename->info x.name)))
                                  (and xinfo.size t))
                 :vl-struct x.packedp
                 :vl-union x.packedp
                 :vl-enum t
                 :vl-usertype (impossible)))))

Theorem: vl-datatype-packedp-of-vl-datatype-fix-x

(defthm vl-datatype-packedp-of-vl-datatype-fix-x
        (equal (vl-datatype-packedp (vl-datatype-fix x))
               (vl-datatype-packedp x)))

Theorem: vl-datatype-packedp-vl-datatype-equiv-congruence-on-x

(defthm vl-datatype-packedp-vl-datatype-equiv-congruence-on-x
        (implies (vl-datatype-equiv x x-equiv)
                 (equal (vl-datatype-packedp x)
                        (vl-datatype-packedp x-equiv)))
        :rule-classes :congruence)