behaviour it works in conjunction with SVSTATE and other [[sv/sprs]].
All bit numbers are in MSB0 form (the bits are numbered from 0 at the MSB
-and counting up as you move to the LSB end). All bit ranges are inclusive
-(so `4:6` means bits 4, 5, and 6).
+on the left
+and counting up as you move rightwards to the LSB end). All bit ranges are inclusive
+(so `4:6` means bits 4, 5, and 6, in MSB0 order).
64-bit instructions are split into two 32-bit words, the prefix and the
suffix. The prefix always comes before the suffix in PC order.