in STATE and SVPSTATE must be zero, and, in the UNIX Platform, an illegal exception
**MUST** be raised if unsupported bits are written to.
+SVPSTATE fields are exactly the sane layout as STATE:
+
++----------+----------+----------+----------+----------+---------+---------+
+| (31..28) | (27..26) | (25..24) | (23..18) | (17..12) | (11..6) | (5...0) |
++----------+----------+----------+----------+----------+---------+---------+
+| rsvd | dsvoffs | subvl | destoffs | srcoffs | vl | maxvl |
++----------+----------+----------+----------+----------+---------+---------+
+
Additional Instructions
=======================