* hphint - Horizontal Parallelism Hint. In Vertical First Mode
hardware **MAY** perform up to this many elements in parallel
per instruction. Set to zero to indicate "no hint".
+* SVme - REMAP enable bits, indicating which register is to be
+ REMAPed. RA, RB, RC, RT or EA.
+* mi0-mi4 - when the corresponding SVme bit is enabled, mi0-mi4
+ indicate the SVSHAPE (0-3) that the corresponding register (RA etc)
+ should use.
For hphint, the number chosen must be consistently
executed **every time**. Hardware is not permitted to execute five