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Vl-always-scary-regs

Determine which lvalues are assigned to in multiple always blocks.

Signature
(vl-always-scary-regs x) → names
Arguments: x — Guard (vl-alwayslist-p x).
Returns: names — Type (and (string-listp names) (setp names)).

These registers are generally too complicated to do anything sensible with.

Definitions and Theorems

Function: vl-always-scary-regs

(defun vl-always-scary-regs (x)
  (declare (xargs :guard (vl-alwayslist-p x)))
  (let ((__function__ 'vl-always-scary-regs))
    (declare (ignorable __function__))
    (redundant-mergesort
         (duplicated-members (vl-always-scary-regs-aux x)))))

Theorem: return-type-of-vl-always-scary-regs

(defthm return-type-of-vl-always-scary-regs
  (b* ((names (vl-always-scary-regs x)))
    (and (string-listp names) (setp names)))
  :rule-classes :rewrite)

Theorem: vl-always-scary-regs-of-vl-alwayslist-fix-x

(defthm vl-always-scary-regs-of-vl-alwayslist-fix-x
  (equal (vl-always-scary-regs (vl-alwayslist-fix x))
         (vl-always-scary-regs x)))

Theorem: vl-always-scary-regs-vl-alwayslist-equiv-congruence-on-x

(defthm vl-always-scary-regs-vl-alwayslist-equiv-congruence-on-x
  (implies (vl-alwayslist-equiv x x-equiv)
           (equal (vl-always-scary-regs x)
                  (vl-always-scary-regs x-equiv)))
  :rule-classes :congruence)

Subtopics

Vl-always-scary-regs-aux: Returns a list where reg names are repeated N times if they are repeated in N different always blocks.