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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 other/113927] [avr-tiny] Sets up a stack-frame even for trivial
 code
Date: Thu, 15 Feb 2024 13:09:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113927

--- Comment #1 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Georg-Johann Lay <gjl@gcc.gnu.org>:

https://gcc.gnu.org/g:5cff288c2dae4ea709df067cf398f23e214b2e80

commit r14-9009-g5cff288c2dae4ea709df067cf398f23e214b2e80
Author: Georg-Johann Lay <avr@gjlay.de>
Date:   Thu Feb 15 13:53:34 2024 +0100

    AVR: target 113927 - Simple code triggers stack frame for Reduced Tiny.

    The -mmcu=3Davrtiny cores have no ADIW and SBIW instructions.  This was
    implemented by clearing all regs out of regclass ADDW_REGS so that
    constraint "w" never matched.  This corrupted the subset relations of
    the register classes as they appear in enum reg_class.

    This patch keeps ADDW_REGS like for all other cores, i.e. it contains
    R24...R31.  Instead of tests like  test_hard_reg_class (ADDW_REGS, *)
    the code now uses  avr_adiw_reg_p (*).  And all insns with constraint "=
w"
    get "isa" insn attribute value of "adiw".

    Plus, a new built-in macro __AVR_HAVE_ADIW__ is provided, which is more
    specific than __AVR_TINY__.

    gcc/
            PR target/113927
            * config/avr/avr.h (AVR_HAVE_ADIW): New macro.
            * config/avr/avr-protos.h (avr_adiw_reg_p): New proto.
            * config/avr/avr.cc (avr_adiw_reg_p): New function.
            (avr_conditional_register_usage) [AVR_TINY]: Don't clear ADDW_R=
EGS.
            Replace test_hard_reg_class (ADDW_REGS, ...) with calls to
            * config/avr/avr.md: Same.
            (attr "isa") <tiny, no_tiny>: Remove.
            <adiw, no_adiw>: Add.
            (define_insn, define_insn_and_split): When an alternative has
            constraint "w", then set attribute "isa" to "adiw".
            * config/avr/avr-c.cc (avr_cpu_cpp_builtins) [AVR_HAVE_ADIW]:
            Built-in define __AVR_HAVE_ADIW__.
            * doc/invoke.texi (AVR Options): Document it.=