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• Gprs-reads-and-writes

Rgfi-size

Read form byte, word, doubleword, or quadword general-purpose register

Signature

(rgfi-size nbytes index rex x86) → val

Returns

val — Type (natp val).

Definitions and Theorems

Function: rgfi-size$inline

(defun rgfi-size$inline (nbytes index rex x86)
  (declare (xargs :stobjs (x86)))
  (declare (type (unsigned-byte 4) nbytes)
           (type (unsigned-byte 4) index)
           (type (unsigned-byte 8) rex))
  (declare (xargs :guard (and (reg-indexp index rex)
                              (member nbytes '(1 2 4 8)))))
  (case nbytes
    (1 (rr08 index rex x86))
    (2 (rr16 index x86))
    (4 (rr32 index x86))
    (8 (rr64 index x86))
    (otherwise 0)))

Theorem: natp-of-rgfi-size

(defthm natp-of-rgfi-size
  (b* ((val (rgfi-size$inline nbytes index rex x86)))
    (natp val))
  :rule-classes :type-prescription)