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• Gprs-reads-and-writes

!rgfi-size

Write to byte, word, doubleword, or quadword general-purpose register

Signature

(!rgfi-size nbytes index val rex x86) → x86

Returns

x86 — Type (x86p x86), given (x86p x86).

Definitions and Theorems

Function: !rgfi-size$inline

(defun !rgfi-size$inline (nbytes index val rex x86)
 (declare (xargs :stobjs (x86)))
 (declare (type (unsigned-byte 4) nbytes)
          (type (unsigned-byte 4) index)
          (type integer val)
          (type (unsigned-byte 8) rex))
 (declare (xargs :guard (and (reg-indexp index rex)
                             (member nbytes '(1 2 4 8))
                             (unsigned-byte-p (ash nbytes 3) val))))
 (case nbytes
   (1 (wr08 index rex val x86))
   (2 (wr16 index val x86))
   (4 (wr32 index val x86))
   (8 (wr64 index val x86))
   (otherwise x86)))

Theorem: x86p-of-!rgfi-size

(defthm x86p-of-!rgfi-size
  (implies (x86p x86)
           (b* ((x86 (!rgfi-size$inline nbytes index val rex x86)))
             (x86p x86)))
  :rule-classes :rewrite)