[Bug target/104817] New: mips: ICE with -fzero-call-used-regs=all

[Bug target/104817] New: mips: ICE with -fzero-call-used-regs=all

[xry111 at mengyan1223 dot wang]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104817

            Bug ID: 104817
           Summary: mips: ICE with -fzero-call-used-regs=all
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: xry111 at mengyan1223 dot wang
  Target Milestone: ---

$ echo 'int t() {}' | /home/xry111/git-repos/gcc-test-mips/gcc/cc1 -nostdinc
-fzero-call-used-regs=all

Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> {heap 1208k} <visibility> {heap 1208k} <build_ssa_passes>
{heap 1208k} <opt_local_passes> {heap 1208k} <remove_symbols> {heap 1208k}
<targetclone> {heap 1208k} <free-fnsummary> {heap 1208k} <emutls> {heap
1208k}Streaming LTO
 <whole-program> {heap 1208k} <fnsummary> {heap 1208k} <inline> {heap 1208k}
<modref> {heap 1208k} <free-fnsummary> {heap 1208k} <single-use> {heap
1208k}Assembling functions:
 tduring RTL pass: final

<stdin>: In function ‘t’:
<stdin>:1:10: internal compiler error: in mips_output_move, at
config/mips/mips.cc:5323
0x1834ac9 mips_output_move(rtx_def*, rtx_def*)
        ../../gcc/gcc/config/mips/mips.cc:5323
0x1ead799 output_313
        ../../gcc/gcc/config/mips/mips.md:4771
0xe21260 get_insn_template(int, rtx_insn*)
        ../../gcc/gcc/final.cc:2047
0xe234ab final_scan_insn_1
        ../../gcc/gcc/final.cc:2827
0xe23933 final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
        ../../gcc/gcc/final.cc:2940
0xe21086 final_1
        ../../gcc/gcc/final.cc:1997
0xe264d5 rest_of_handle_final
        ../../gcc/gcc/final.cc:4285
0xe26834 execute
        ../../gcc/gcc/final.cc:4363
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

[Bug target/104817] mips: ICE with -fzero-call-used-regs=all

[xry111 at mengyan1223 dot wang]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104817

--- Comment #1 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
Not sure if this is an regression: it triggers another ICE with 11.2.0.

[Bug target/104817] mips: ICE with -fzero-call-used-regs=all

[xry111 at mengyan1223 dot wang]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104817

Xi Ruoyao <xry111 at mengyan1223 dot wang> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |mips64
      Known to fail|                            |12.0

--- Comment #2 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
It seems mips_output_move is called to "move" a const zero to the hi (!)
register :(.

[Bug target/104817] mips: ICE in mips_output_move, at config/mips/mips.cc:5323 with -fzero-call-used-regs=all

[xry111 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104817

Xi Ruoyao <xry111 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |qing.zhao at oracle dot com

--- Comment #3 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
Hi Qing,

Any progress on the
https://gcc.gnu.org/pipermail/gcc-patches/2022-March/592002.html stuff?

We just got another complain about -fzero-call-used-regs= on mips today...
(PR114466) and let's make another try to solve it (maybe for GCC 15).

[Bug target/104817] mips: ICE in mips_output_move, at config/mips/mips.cc:5323 with -fzero-call-used-regs=all

[qinzhao at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104817

qinzhao at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |qinzhao at gcc dot gnu.org

--- Comment #4 from qinzhao at gcc dot gnu.org ---
(In reply to Xi Ruoyao from comment #3)
> Hi Qing,
> 
> Any progress on the
> https://gcc.gnu.org/pipermail/gcc-patches/2022-March/592002.html stuff?
> 
> We just got another complain about -fzero-call-used-regs= on mips today...
> (PR114466) and let's make another try to solve it (maybe for GCC 15).

not sure if I have time working on this one right now, but I will put it in my
todo list for GCC15. 

At the same time, if you have time, you can fix this yourself, I can help with
reviewing the code.