[Bug rtl-optimization/67609] [5/6 Regression] Generates wrong code for SSE2 _mm_load_pd

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67609

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
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          Component|target                      |rtl-optimization

--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Richard Biener from comment #4)
> (In reply to Uroš Bizjak from comment #3)
> > The doc says:
> > 
> >           When used as an lvalue, 'subreg' is a word-based accessor.
> >           Storing to a 'subreg' modifies all the words of REG that
> >           overlap the 'subreg', but it leaves the other words of REG
> >           alone.
> 
> But UNITS_PER_WORD is 8 so (subreg:DF (TI)) should leave the upper half
> of the TImode register unchanged.

Indeed, and -m32 creates correct code. So, it is register allocator that fails.

Reconfirmed as rtl-optimization problem.