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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 [thread overview]
Message-ID: <bug-113927-4-H4R2kzFUro@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-113927-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113927
--- 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=avrtiny 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_REGS.
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.
next prev parent reply other threads:[~2024-02-15 13:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-15 9:43 [Bug other/113927] New: " gjl at gcc dot gnu.org
2024-02-15 12:47 ` [Bug other/113927] " pinskia at gcc dot gnu.org
2024-02-15 13:09 ` cvs-commit at gcc dot gnu.org [this message]
2024-02-15 13:49 ` cvs-commit at gcc dot gnu.org
2024-02-15 13:50 ` [Bug target/113927] " gjl at gcc dot gnu.org
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