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Subject: [Bug rtl-optimization/98782] [11/12 Regression] Bad interaction
 between IPA frequences and IRA resulting in spills due to changes in BB
 frequencies
Date: Mon, 10 Jan 2022 14:47:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98782

--- Comment #37 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Sandiford <rsandifo@gcc.gnu.o=
rg>:

https://gcc.gnu.org/g:909a4b4764c4f270f09ccb2a950c91b21ed7b33a

commit r12-6412-g909a4b4764c4f270f09ccb2a950c91b21ed7b33a
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Mon Jan 10 14:47:07 2022 +0000

    ira: Add comments and fix move_spill_restore calculation

    This patch adds comments to describe each use of ira_loop_border_costs.
    I think this highlights that move_spill_restore was using the wrong cost
    in one case, which came from tranposing [0] and [1] in the original
    (pre-ira_loop_border_costs) ira_memory_move_cost expressions.  The
    difference would only be noticeable on targets that distinguish between
    load and store costs.

    gcc/
            PR rtl-optimization/98782
            * ira-color.c (color_pass): Add comments to describe the spill
costs.
            (move_spill_restore): Likewise.  Fix reversed calculation.=