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Syscalls

Vl-$random-expr-p

Recognize calls of the $random system function.

Signature
(vl-$random-expr-p x) → *
Arguments: x — Guard (vl-expr-p x).

The $random system call is described in Verilog-2005, Section 17.9.1 on page 311, or in SystemVerilog-2012 Section 20.15. In either case the syntax is:

random_function ::= $random[ '(' seed ')' ]

Note that the seed is supposed to be a reg, integer, or time variable, but we do not check for this here.

Definitions and Theorems

Function: vl-$random-expr-p

(defun vl-$random-expr-p (x)
  (declare (xargs :guard (vl-expr-p x)))
  (let ((__function__ 'vl-$random-expr-p))
    (declare (ignorable __function__))
    (or (vl-0ary-syscall-p "$random" x)
        (vl-unary-syscall-p "$random" x))))

Theorem: vl-expr-kind-when-vl-$random-expr-p

(defthm vl-expr-kind-when-vl-$random-expr-p
  (implies (vl-$random-expr-p x)
           (and (equal (vl-expr-kind x) :nonatom)
                (equal (vl-nonatom->op x) :vl-syscall)))
  :rule-classes ((:forward-chaining)))

Theorem: vl-$random-expr-p-of-vl-expr-fix-x

(defthm vl-$random-expr-p-of-vl-expr-fix-x
  (equal (vl-$random-expr-p (vl-expr-fix x))
         (vl-$random-expr-p x)))

Theorem: vl-$random-expr-p-vl-expr-equiv-congruence-on-x

(defthm vl-$random-expr-p-vl-expr-equiv-congruence-on-x
  (implies (vl-expr-equiv x x-equiv)
           (equal (vl-$random-expr-p x)
                  (vl-$random-expr-p x-equiv)))
  :rule-classes :congruence)