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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/109858] [14 Regression] r14-172 caused some
 SPEC2017 bmk to degrade on Power
Date: Fri, 26 May 2023 01:46:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109858

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:

https://gcc.gnu.org/g:4fb66b2329319e9b47e89200d613b6f741a114fc

commit r14-1252-g4fb66b2329319e9b47e89200d613b6f741a114fc
Author: liuhongt <hongtao.liu@intel.com>
Date:   Tue May 16 10:36:16 2023 +0800

    Only use NO_REGS in cost calculation when !hard_regno_mode_ok for
GENERAL_REGS and mode.

    r14-172-g0368d169492017 replaces GENERAL_REGS with NO_REGS in cost
    calculation when the preferred register class are not known yet.
    It regressed powerpc PR109610 and PR109858, it looks too aggressive to =
use
    NO_REGS when mode can be allocated with GENERAL_REGS.
    The patch takes a step back, still use GENERAL_REGS when
    hard_regno_mode_ok for mode and GENERAL_REGS, otherwise uses NO_REGS.

    gcc/ChangeLog:

            PR target/109610
            PR target/109858
            * ira-costs.cc (scan_one_insn): Only use NO_REGS in cost
            calculation when !hard_regno_mode_ok for GENERAL_REGS and
            mode, otherwise still use GENERAL_REGS.=