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Subject: [Bug tree-optimization/99927] [11 Regression] Wrong code since
 r11-39-gf9e1ea10e657af9f
Date: Sun, 18 Apr 2021 15:01:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99927

--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Segher Boessenkool <segher@gcc.gnu.or=
g>:

https://gcc.gnu.org/g:b412ce8e961052e6becea3bc783a53e1d5feaa0f

commit r11-8237-gb412ce8e961052e6becea3bc783a53e1d5feaa0f
Author: Segher Boessenkool <segher@kernel.crashing.org>
Date:   Sat Apr 17 18:06:17 2021 +0000

    combine: Don't create REG_UNUSED notes if the reg already died (PR99927)

    If the register named in an existing REG_UNUSED note dies somewhere
    between where the note used to be and I3, we should just drop it.

    2021-04-21  Segher Boessenkool  <segher@kernel.crashing.org>

            PR rtl-optimization/99927
            * combine.c (distribute_notes) [REG_UNUSED]: If the register
already
            is dead, just drop it.=