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• Xmms-reads-and-writes

!xmmi-size

Write val to low nbytes of an XMM register; upper bits of the ZMM register are preserved.

Signature

(!xmmi-size nbytes index val x86) → x86

Returns

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

Definitions and Theorems

Function: !xmmi-size$inline

(defun !xmmi-size$inline (nbytes index val x86)
 (declare (xargs :stobjs (x86)))
 (declare (type (unsigned-byte 5) nbytes)
          (type (unsigned-byte 4) index)
          (type integer val))
 (declare (xargs :guard (and (member nbytes '(4 8 16))
                             (unsigned-byte-p (ash nbytes 3) val))))
 (case nbytes
   (4 (wx32 index val x86))
   (8 (wx64 index val x86))
   (16 (wx128 index val x86))
   (otherwise x86)))

Theorem: x86p-of-!xmmi-size

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