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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/96475] direct threaded interpreter with
 computed gotos generates suboptimal dispatch loop
Date: Wed, 09 Sep 2020 16:56:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96475

--- Comment #7 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:69ca5f3a988266da8905aef9cf22aa02807e0471

commit r11-3078-g69ca5f3a988266da8905aef9cf22aa02807e0471
Author: Segher Boessenkool <segher@kernel.crashing.org>
Date:   Fri Aug 7 01:31:38 2020 +0000

    bb-reorder: Remove a misfiring micro-optimization (PR96475)

    When the compgotos pass copies the tail of blocks ending in an indirect
    jump, there is a micro-optimization to not copy the last one, since the
    original block will then just be deleted.  This does not work properly
    if cleanup_cfg does not merge all pairs of blocks we expect it to.  It
    also does not work if that last block can be merged into multiple
    predecessors.

    2020-09-09  Segher Boessenkool  <segher@kernel.crashing.org>

            PR rtl-optimization/96475
            * bb-reorder.c (maybe_duplicate_computed_goto): Remove
single_pred_p
            micro-optimization.=