[Bug rtl-optimization/57189] [4.9 Regression] Vector register is spilled for vector extract pattern

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57189

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #4)
> (In reply to Jakub Jelinek from comment #3)
> > Likely caused by r198611.
> 
> This is the patch that exposes the problem.
> 
> I have filled this PR due to the difference with IRA vs. reload, it looks
> that spill size should be somehow taken into account.

What was the point of the r198611 patch other than macroizing some insns
though?
Isn't it worth to just restore the previous behavior when it worked properly
with both reload and LRA?
>From gcc-bugs-return-437825-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Dec 17 11:12:48 2013
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Subject: [Bug rtl-optimization/59535] [4.9 regression] -Os code size regressions for Thumb1/Thumb2 with LRA
Date: Tue, 17 Dec 2013 11:12:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY535

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.9 regression] -Os code   |[4.9 regression] -Os code
                   |size regressions for        |size regressions for
                   |Thumb1/Thumb2 (with LRA)?   |Thumb1/Thumb2 with LRA

--- Comment #3 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
It seems that one of the major problems is a significant increase in the number
of mov instructions to copy registers from one location to another.  This is
probably due to the two-operand format instructions we have in Thumb.