[Bug rtl-optimization/91154] [10 Regression] 456.hmmer regression on Haswell caused by r272922

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91154

--- Comment #28 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Richard Biener from comment #26)
> This is the powers of simplify_subreg I guess.  We're lucky it doesn't do
> this to arbitrary arithmetic.
> 
> So we need to really change all defs we introduce to vector modes instead of
> making our live easy and using paradoxical subregs all over the place.

No, IMO IRA should be "fixed" to avoid stack temporary and (based on some cost
metric) use direct move for paradoxical subregs.