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Vl-sysfun-should-size-args-p

Should we size the arguments to this system call?

Signature

(vl-sysfun-should-size-args-p name) → bool

Arguments

name — E.g., $bits.
    Guard (stringp name).

This is used among functions like vl-expr-expandsizes and our notion of welltyped expressions to decide whether calls of system functions should have their arguments sized normally.

Motivation: consider the system function $bits, which can take either a type or an expression as its argument. We don't want to size $bits normally because we don't normally have types in expressions.

However, for functions like $clog2 or $random, we should go ahead and size the arguments.

Definitions and Theorems

Function: vl-sysfun-should-size-args-p

(defun vl-sysfun-should-size-args-p (name)
  (declare (xargs :guard (stringp name)))
  (let ((__function__ 'vl-sysfun-should-size-args-p))
    (declare (ignorable __function__))
    (let ((name (string-fix name)))
      (not (equal name "$bits")))))

Theorem: vl-sysfun-should-size-args-p-of-str-fix-name

(defthm vl-sysfun-should-size-args-p-of-str-fix-name
  (equal (vl-sysfun-should-size-args-p (str-fix name))
         (vl-sysfun-should-size-args-p name)))

Theorem: vl-sysfun-should-size-args-p-streqv-congruence-on-name

(defthm vl-sysfun-should-size-args-p-streqv-congruence-on-name
  (implies (streqv name name-equiv)
           (equal (vl-sysfun-should-size-args-p name)
                  (vl-sysfun-should-size-args-p name-equiv)))
  :rule-classes :congruence)