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Representation-of-integer-operations

Div-ushort-ulong

Division of a value of type unsigned short and a value of type unsigned long [C:6.5.5].

Definitions and Theorems

Function: div-ushort-ulong

(defun div-ushort-ulong (x y)
  (declare (xargs :guard (and (ushortp x)
                              (ulongp y)
                              (div-ushort-ulong-okp x y))))
  (div-ulong-ulong (ulong-from-ushort x)
                   y))

Theorem: ulongp-of-div-ushort-ulong

(defthm ulongp-of-div-ushort-ulong
  (ulongp (div-ushort-ulong x y)))

Theorem: div-ushort-ulong-of-ushort-fix-x

(defthm div-ushort-ulong-of-ushort-fix-x
  (equal (div-ushort-ulong (ushort-fix x) y)
         (div-ushort-ulong x y)))

Theorem: div-ushort-ulong-ushort-equiv-congruence-on-x

(defthm div-ushort-ulong-ushort-equiv-congruence-on-x
  (implies (ushort-equiv x x-equiv)
           (equal (div-ushort-ulong x y)
                  (div-ushort-ulong x-equiv y)))
  :rule-classes :congruence)

Theorem: div-ushort-ulong-of-ulong-fix-y

(defthm div-ushort-ulong-of-ulong-fix-y
  (equal (div-ushort-ulong x (ulong-fix y))
         (div-ushort-ulong x y)))

Theorem: div-ushort-ulong-ulong-equiv-congruence-on-y

(defthm div-ushort-ulong-ulong-equiv-congruence-on-y
  (implies (ulong-equiv y y-equiv)
           (equal (div-ushort-ulong x y)
                  (div-ushort-ulong x y-equiv)))
  :rule-classes :congruence)