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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/110587] [14 regression] 96% pr28071.c compile
 time regression since r14-2337-g37a231cc7594d1
Date: Wed, 02 Aug 2023 07:04:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110587

--- Comment #18 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:07b7cd70399d22c113ad8bb1eff5cc2d12973d33

commit r14-2920-g07b7cd70399d22c113ad8bb1eff5cc2d12973d33
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Jul 25 15:32:11 2023 +0200

    rtl-optimization/110587 - remove quadratic regno_in_use_p

    The following removes the code checking whether a noop copy
    is between something involved in the return sequence composed
    of a SET and USE.  Instead of checking for this special-case
    the following makes us only ever remove noop copies between
    pseudos - which is the case that is necessary for IRA/LRA
    interfacing to function according to the comment.  That makes
    looking for the return reg special case unnecessary, reducing
    the compile-time in LRA non-specific to zero for the testcase.

            PR rtl-optimization/110587
            * lra-spills.cc (return_regno_p): Remove.
            (regno_in_use_p): Likewise.
            (lra_final_code_change): Do not remove noop moves
            between hard registers.=