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Representation-of-integer-operations

Div-ullong-ullong-okp

Check if the division of a value of type unsigned long long and a value of type unsigned long long is well-defined.

Definitions and Theorems

Function: div-ullong-ullong-okp

(defun div-ullong-ullong-okp (x y)
  (declare (xargs :guard (and (ullongp x) (ullongp y))))
  (not (equal (integer-from-ullong y) 0)))

Theorem: booleanp-of-div-ullong-ullong-okp

(defthm booleanp-of-div-ullong-ullong-okp
  (booleanp (div-ullong-ullong-okp x y)))

Theorem: div-ullong-ullong-okp-of-ullong-fix-x

(defthm div-ullong-ullong-okp-of-ullong-fix-x
  (equal (div-ullong-ullong-okp (ullong-fix x) y)
         (div-ullong-ullong-okp x y)))

Theorem: div-ullong-ullong-okp-ullong-equiv-congruence-on-x

(defthm div-ullong-ullong-okp-ullong-equiv-congruence-on-x
  (implies (ullong-equiv x x-equiv)
           (equal (div-ullong-ullong-okp x y)
                  (div-ullong-ullong-okp x-equiv y)))
  :rule-classes :congruence)

Theorem: div-ullong-ullong-okp-of-ullong-fix-y

(defthm div-ullong-ullong-okp-of-ullong-fix-y
  (equal (div-ullong-ullong-okp x (ullong-fix y))
         (div-ullong-ullong-okp x y)))

Theorem: div-ullong-ullong-okp-ullong-equiv-congruence-on-y

(defthm div-ullong-ullong-okp-ullong-equiv-congruence-on-y
  (implies (ullong-equiv y y-equiv)
           (equal (div-ullong-ullong-okp x y)
                  (div-ullong-ullong-okp x y-equiv)))
  :rule-classes :congruence)