[Bug target/99758] New: ICE in setup_preferred_alternate_classes_for_new_pseudos, at ira.c:2772

[Bug target/99758] New: ICE in setup_preferred_alternate_classes_for_new_pseudos, at ira.c:2772

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99758

            Bug ID: 99758
           Summary: ICE in
                    setup_preferred_alternate_classes_for_new_pseudos, at
                    ira.c:2772
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: aarch64-linux-gnu

gcc-11.0.1-alpha20210321 snapshot (g:fc24ea2374259d401a46ce3526688b7e79d4cc13)
ICEs when compiling gcc/testsuite/gcc.target/i386/pr55934.c w/ -O2 -fPIC
-fstack-protector-all:

% aarch64-linux-gnu-gcc-11.0.1 -O2 -fstack-protector-all -c
gcc/testsuite/gcc.target/i386/pr55934.c
during RTL pass: ira
gcc/testsuite/gcc.target/i386/pr55934.c: In function 'foo':
gcc/testsuite/gcc.target/i386/pr55934.c:10:1: internal compiler error: in
setup_preferred_alternate_classes_for_new_pseudos, at ira.c:2772
   10 | }
      | ^
0x71c45e setup_preferred_alternate_classes_for_new_pseudos
       
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-11.0.1_alpha20210321/work/gcc-11-20210321/gcc/ira.c:2772
0x71c45e expand_reg_info
       
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-11.0.1_alpha20210321/work/gcc-11-20210321/gcc/ira.c:2799
0xce840f find_moveable_pseudos
       
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-11.0.1_alpha20210321/work/gcc-11-20210321/gcc/ira.c:4889
0xce840f ira
       
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-11.0.1_alpha20210321/work/gcc-11-20210321/gcc/ira.c:5639
0xce840f execute
       
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-11.0.1_alpha20210321/work/gcc-11-20210321/gcc/ira.c:5977

[Bug target/99758] ICE in setup_preferred_alternate_classes_for_new_pseudos, at ira.c:2772

[acoplan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99758

Alex Coplan <acoplan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |acoplan at gcc dot gnu.org,
                   |                            |wilco at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-03-25
     Ever confirmed|0                           |1

--- Comment #1 from Alex Coplan <acoplan at gcc dot gnu.org> ---
Confirmed. Started with r7-1850-ge4bbb037670323fbc578b6bc68cfb5252f1bf0cc:

commit e4bbb037670323fbc578b6bc68cfb5252f1bf0cc
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Wed Jul 6 13:17:23 2016 +0000

    This patch improves the accuracy of the Cortex-A53 integer scheduler...

[Bug target/99758] ICE in setup_preferred_alternate_classes_for_new_pseudos, at ira.c:2772

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99758

--- Comment #2 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Alex Coplan from comment #1)
> Confirmed. Started with r7-1850-ge4bbb037670323fbc578b6bc68cfb5252f1bf0cc:
> 
> commit e4bbb037670323fbc578b6bc68cfb5252f1bf0cc
> Author: Wilco Dijkstra <wdijkstr@arm.com>
> Date:   Wed Jul 6 13:17:23 2016 +0000
> 
>     This patch improves the accuracy of the Cortex-A53 integer scheduler...

That's not related, all it does is expose a latent regalloc bug via different
scheduling.