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Representation-of-integer-operations

Minus-uchar

Unary minus of a value of type unsigned char [C:6.5.3].

Definitions and Theorems

Function: minus-uchar

(defun minus-uchar (x)
  (declare (xargs :guard (and (ucharp x) (minus-uchar-okp x))))
  (minus-sint (sint-from-uchar x)))

Theorem: sintp-of-minus-uchar

(defthm sintp-of-minus-uchar
  (sintp (minus-uchar x)))

Theorem: minus-uchar-of-uchar-fix-x

(defthm minus-uchar-of-uchar-fix-x
  (equal (minus-uchar (uchar-fix x))
         (minus-uchar x)))

Theorem: minus-uchar-uchar-equiv-congruence-on-x

(defthm minus-uchar-uchar-equiv-congruence-on-x
  (implies (uchar-equiv x x-equiv)
           (equal (minus-uchar x)
                  (minus-uchar x-equiv)))
  :rule-classes :congruence)