From: Alexei Starovoitov <alexei.starovoi...@gmail.com>
Date: Mon, 9 Oct 2017 16:06:20 -0700
>> For these archs, wouldn't it then be more efficient to use BUG_ON
>> rather than BUG()?
>
> why more efficient? any data to prove that?
It can completely eliminate a branch.
For example on powerpc if you use BUG() then the code generated is:
test condition
branch_not_true 1f
unconditional_trap
1:
Whereas with BUG_ON() it's just:
test condition
trap_if_true
Which is a lot better even when the branches in the first case are
well predicted.
