[Bug target/81763] Issues with BMI on 32bit x86 apps on GCC 7.1+

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81763

--- Comment #37 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #33)

> and it should work.  The last case would be right now:
>   SI:N+1 = SI:N &~ SI:N+2; SI:N+2 = SI:N+1 &~ SI:N+3;
> and is again wrong, but we could again swap:
>   SI:N+2 = SI:N+1 &~ SI:N+3; SI:N+1 = SI:N &~ SI:N+2;
> and all is fine.

Whoops, it looks that SI:N+2 is clobbered in the swapped case.