[Bug target/104686] [12 Regression] Huge compile-time regression building SPEC 2017 538.imagick_r with -march=skylake

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104686

--- Comment #11 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Martin Liška from comment #8)
> (In reply to Martin Liška from comment #7)
> > (In reply to Richard Biener from comment #6)
> > > Both revisions affect vectorizer cost modeling only.  With
> > > -fno-vect-cost-model it compiles faster for me but still a slow 30s and 91%
> > > in RA.
> > 
> > There are numbers with -fno-vect-cost-model:
> > 
> > Bisecting latest revisions
> >   a9e2ebe839d56416(24 Feb 2022 22:16)(oliva@adacore.com): [took: 36.06 s]
> > result: OK
> >   250f234988b62316(20 Apr 2021 09:51)(stefansf@linux.ibm.com): [took: 18.35
> > s] result: OK
> > 
> > I'm going to find out where the change happensed.
> 
> Which started with r12-2463-ga6291d88d5b6c17d.

Wonder if it's related to hard register usage in pass_expand
op1 = ix86_gen_scratch_sse_rtx (mode);