Hacker News new | ask | show | jobs
by adrian_b 639 days ago
True.

The 8 index registers ("B-tube") are called B0 to B7 in this manual.

The B0 index register is hardwired to have the read-only value "0".

A read-only null register continues to be used in many modern instruction sets, e.g. in POWER or in Aarch64.