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• Datatype-tools

Vl-datatype-select-ok

Determines whether this datatype can be selected.

Signature

(vl-datatype-select-ok x) → ok

Arguments

x — Guard (vl-datatype-p x).

The input datatype should not have packed or unpacked dimensions; if it does, then it's definitely OK to index into it (though it's only a select if it's the last packed dimension). The input datatype should have usertypes resolved.

Definitions and Theorems

Function: vl-datatype-select-ok

(defun vl-datatype-select-ok (x)
 (declare (xargs :guard (vl-datatype-p x)))
 (declare (xargs :guard (vl-datatype-resolved-p x)))
 (let ((__function__ 'vl-datatype-select-ok))
  (declare (ignorable __function__))
  (b* ((x (vl-maybe-usertype-resolve x)))
   (or
    (consp (vl-datatype->pdims x))
    (consp (vl-datatype->udims x))
    (vl-datatype-case
         x
         (:vl-coretype (b* (((vl-coredatatype-info xinfo)
                             (vl-coretypename->info x.name)))
                         (and xinfo.size (not (eql xinfo.size 1)))))
         (:vl-struct x.packedp)
         (:vl-union x.packedp)
         (:vl-enum t)
         (:vl-usertype (impossible)))))))

Theorem: vl-datatype-select-ok-of-vl-datatype-fix-x

(defthm vl-datatype-select-ok-of-vl-datatype-fix-x
  (equal (vl-datatype-select-ok (vl-datatype-fix x))
         (vl-datatype-select-ok x)))

Theorem: vl-datatype-select-ok-vl-datatype-equiv-congruence-on-x

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