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Primitive-functions

Eval-unary--

Evaluation semantics of unary--.

Signature
(eval-unary-- x) → result
Arguments: x — Guard (valuep x).
Returns: result — Type (valuep result).

Definitions and Theorems

Function: eval-unary--

(defun eval-unary-- (x)
  (declare (xargs :guard (valuep x)))
  (let ((__function__ 'eval-unary--))
    (declare (ignorable __function__))
    (value-number (if (value-case x :number)
                      (unary-- (value-number->get x))
                    0))))

Theorem: valuep-of-eval-unary--

(defthm valuep-of-eval-unary--
  (b* ((result (eval-unary-- x)))
    (valuep result))
  :rule-classes :rewrite)

Theorem: eval-unary---of-value-fix-x

(defthm eval-unary---of-value-fix-x
  (equal (eval-unary-- (value-fix x))
         (eval-unary-- x)))

Theorem: eval-unary---value-equiv-congruence-on-x

(defthm eval-unary---value-equiv-congruence-on-x
  (implies (value-equiv x x-equiv)
           (equal (eval-unary-- x)
                  (eval-unary-- x-equiv)))
  :rule-classes :congruence)