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Subject: [Bug middle-end/113354] [14 Regression] : unable to find a register
 to spill on mips
Date: Mon, 15 Jan 2024 15:26:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113354

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Vladimir Makarov <vmakarov@gcc.gnu.or=
g>:

https://gcc.gnu.org/g:76bc70387d936e3c929368c265ce71e8b239e7b7

commit r14-7248-g76bc70387d936e3c929368c265ce71e8b239e7b7
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Mon Jan 15 10:19:39 2024 -0500

    [PR113354][LRA]: Fixing LRA failure on building MIPS GCC

    My recent patch for PR112918 triggered a hidden bug in LRA on MIPS.  A
    pseudo is matched to a register constraint and assigned to a hard
    registers at the first constraint sub-pass but later it is matched to
    X constraint.  Keeping this pseudo in the register (MD0) prevents to
    use the same register for another pseudo in the insn and this results
    in LRA failure.  The patch fixes this by spilling the pseudo at the
    constraint subpass when the chosen alternative constraint not require
    hard register anymore.

    gcc/ChangeLog:

            PR middle-end/113354
            * lra-constraints.cc (curr_insn_transform): Spill pseudo only u=
sed
            in the insn if the corresponding operand does not require hard
            register anymore.=