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Implementation-environments

Ienv->int-byte-size

Number of bytes of unsigned and signed int objects.

Signature
(ienv->int-byte-size ienv) → size
Arguments: ienv — Guard (ienvp ienv).
Returns: size — Type (posp size).

Definitions and Theorems

Function: ienv->int-byte-size

(defun ienv->int-byte-size (ienv)
  (declare (xargs :guard (ienvp ienv)))
  (/ (ienv->int-bit-size ienv)
     (ienv->char-size ienv)))

Theorem: posp-of-ienv->int-byte-size

(defthm posp-of-ienv->int-byte-size
  (b* ((size (ienv->int-byte-size ienv)))
    (posp size))
  :rule-classes :rewrite)

Theorem: ienv->int-byte-size-type-prescription

(defthm ienv->int-byte-size-type-prescription
  (b* ((?size (ienv->int-byte-size ienv)))
    (posp size))
  :rule-classes :type-prescription)

Theorem: ienv->int-byte-size-of-ienv-fix-ienv

(defthm ienv->int-byte-size-of-ienv-fix-ienv
  (equal (ienv->int-byte-size (ienv-fix ienv))
         (ienv->int-byte-size ienv)))

Theorem: ienv->int-byte-size-ienv-equiv-congruence-on-ienv

(defthm ienv->int-byte-size-ienv-equiv-congruence-on-ienv
  (implies (ienv-equiv ienv ienv-equiv)
           (equal (ienv->int-byte-size ienv)
                  (ienv->int-byte-size ienv-equiv)))
  :rule-classes :congruence)