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• Ubyte4

Ubyte4-fix

Fixer for ubyte4.

Signature

(ubyte4-fix x) → fixed-x

Arguments

x — Guard (ubyte4p x).

Returns

fixed-x — Type (ubyte4p fixed-x).

Definitions and Theorems

Function: ubyte4-fix

(defun ubyte4-fix (x)
  (declare (xargs :guard (ubyte4p x)))
  (mbe :logic (if (ubyte4p x) x 0)
       :exec x))

Theorem: ubyte4p-of-ubyte4-fix

(defthm ubyte4p-of-ubyte4-fix
  (b* ((fixed-x (ubyte4-fix x)))
    (ubyte4p fixed-x))
  :rule-classes :rewrite)

Theorem: ubyte4-fix-when-ubyte4p

(defthm ubyte4-fix-when-ubyte4p
  (implies (ubyte4p x)
           (equal (ubyte4-fix x) x)))