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Structures

Vex->r

Get the R field of vex-prefixes; cognizant of the two- or three-byte VEX prefixes form.

Signature
(vex->r vex-prefixes) → r
Returns: r — Type (unsigned-byte-p 1 r), given (vex-prefixes-byte0-p vex-prefixes).

Definitions and Theorems

Function: vex->r$inline

(defun vex->r$inline (vex-prefixes)
  (declare (type (unsigned-byte 24) vex-prefixes))
  (declare (xargs :guard (vex-prefixes-byte0-p vex-prefixes)))
  (case (vex-prefixes->byte0 vex-prefixes)
    (197 (vex2-byte1->r (vex-prefixes->byte1 vex-prefixes)))
    (196 (vex3-byte1->r (vex-prefixes->byte1 vex-prefixes)))
    (otherwise -1)))

Theorem: return-type-of-vex->r

(defthm return-type-of-vex->r
  (implies (vex-prefixes-byte0-p vex-prefixes)
           (b* ((r (vex->r$inline vex-prefixes)))
             (unsigned-byte-p 1 r)))
  :rule-classes :rewrite)