[Bug bootstrap/69677] [6 Regression] bootstrap failed with --with-arch=corei7 --with-cpu=corei7

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69677

--- Comment #16 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Ilya Enkovich from comment #15)
> (In reply to Jakub Jelinek from comment #13)
> > Fixed.
> 
> I think you just hide LRA issue disabling STV and LRA still may generate
> incorrect register fill

Yes, but stage 4 is not the time to solve these kind of bugs. As said, the fix
disables STV for rare and unusual cases. I expect that proper fix will be
developed during gcc-7 time, and this includes various RA fixes.

Previous patch relaxed alignment requirements to 64 bits, and this triggered RA
bug. So, unless we want to delay release for a couple of weeks (a month?), we
will leave alignment to 128 bits.

That doesn't mean that incorrect register fill RA bug should't be fixed during
stage-4. Do we have a small testcase that exposes it?