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Representation-of-integer-operations

Add-sshort-schar

Addition of a value of type signed short and a value of type signed char [C:6.5.6].

Definitions and Theorems

Function: add-sshort-schar

(defun add-sshort-schar (x y)
  (declare (xargs :guard (and (sshortp x)
                              (scharp y)
                              (add-sshort-schar-okp x y))))
  (add-sint-sint (sint-from-sshort x)
                 (sint-from-schar y)))

Theorem: sintp-of-add-sshort-schar

(defthm sintp-of-add-sshort-schar
  (sintp (add-sshort-schar x y)))

Theorem: add-sshort-schar-of-sshort-fix-x

(defthm add-sshort-schar-of-sshort-fix-x
  (equal (add-sshort-schar (sshort-fix x) y)
         (add-sshort-schar x y)))

Theorem: add-sshort-schar-sshort-equiv-congruence-on-x

(defthm add-sshort-schar-sshort-equiv-congruence-on-x
  (implies (sshort-equiv x x-equiv)
           (equal (add-sshort-schar x y)
                  (add-sshort-schar x-equiv y)))
  :rule-classes :congruence)

Theorem: add-sshort-schar-of-schar-fix-y

(defthm add-sshort-schar-of-schar-fix-y
  (equal (add-sshort-schar x (schar-fix y))
         (add-sshort-schar x y)))

Theorem: add-sshort-schar-schar-equiv-congruence-on-y

(defthm add-sshort-schar-schar-equiv-congruence-on-y
  (implies (schar-equiv y y-equiv)
           (equal (add-sshort-schar x y)
                  (add-sshort-schar x y-equiv)))
  :rule-classes :congruence)