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Vl-datatype-bitselect-ok

Determines whether this datatype can be bitselected.

Signature

(vl-datatype-bitselect-ok x) → okp

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 bitselect if it's the last packed dimension). The input datatype should have usertypes resolved.

Definitions and Theorems

Function: vl-datatype-bitselect-ok

(defun vl-datatype-bitselect-ok (x)
 (declare (xargs :guard (vl-datatype-p x)))
 (declare (xargs :guard (and (not (consp (vl-datatype->pdims x)))
                             (not (consp (vl-datatype->udims x))))))
 (let ((__function__ 'vl-datatype-bitselect-ok))
   (declare (ignorable __function__))
   (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 nil)
        (:vl-usertype nil))))

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

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

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

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