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State-stobj

Write1-memory-unsigned16

Signature
(write1-memory-unsigned16 addr val stat1 feat) → *

Definitions and Theorems

Function: write1-memory-unsigned16

(defun write1-memory-unsigned16 (addr val stat1 feat)
 (declare (xargs :stobjs (stat1)))
 (declare (xargs :non-executable t
                 :guard (and (stat1p stat1)
                             (b* ((stat (stat-from-stat1 stat1)))
                               (and (integerp addr)
                                    (ubyte16p val)
                                    (statp stat)
                                    (featp feat)
                                    (stat-validp stat feat))))))
 (prog2$
  (acl2::throw-nonexec-error 'write1-memory-unsigned16
                             (list addr val stat1 feat))
  (let ((__function__ 'write1-memory-unsigned16))
   (declare (ignorable __function__))
   (if
    (mbt (stat1p stat1))
    (stat1-from-stat
     (b* ((stat (stat-from-stat1 stat1)))
      (let* ((val (ubyte16-fix val))
             (b0 (bitops::part-select-width-low val 8 0))
             (b1 (bitops::part-select-width-low val 8 8)))
       (mv-let (1st-byte 2nd-byte)
               (if (feat-little-endianp feat)
                   (mv b0 b1)
                 (mv b1 b0))
         (let*
            ((stat (write-memory-unsigned8 addr 1st-byte stat feat))
             (stat (write-memory-unsigned8 (+ (lifix addr) 1)
                                           2nd-byte stat feat)))
           stat)))))
    stat1))))