[Bug target/96544] New: ICE in simplify_gen_subreg_concatn, at lower-subreg.c:717

[Bug target/96544] New: ICE in simplify_gen_subreg_concatn, at lower-subreg.c:717

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96544

            Bug ID: 96544
           Summary: ICE in simplify_gen_subreg_concatn, at
                    lower-subreg.c:717
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-*-linux-gnu

gcc-11.0.0-alpha20200802 snapshot (g:6e46b3f3da5c03bc529b3690dd0995927feb9142)
ICEs when compiling gcc/testsuite/gcc.dg/pr94574.c w/ -O1 -fno-dce
-fno-tree-fre:

% powerpc-e300c3-linux-gnu-gcc-11.0.0 -O1 -fno-dce -fno-tree-fre -w -c
gcc/testsuite/gcc.dg/pr94574.c
during RTL pass: subreg2
gcc/testsuite/gcc.dg/pr94574.c: In function 'foo':
gcc/testsuite/gcc.dg/pr94574.c:15:1: internal compiler error: in
simplify_gen_subreg_concatn, at lower-subreg.c:717
   15 | }
      | ^
0x77b21d simplify_gen_subreg_concatn
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200802/work/gcc-11-20200802/gcc/lower-subreg.c:717
0x169048a resolve_simple_move
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200802/work/gcc-11-20200802/gcc/lower-subreg.c:1091
0x16917fb decompose_multiword_subregs
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200802/work/gcc-11-20200802/gcc/lower-subreg.c:1657
0x169229d execute
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-11.0.0_alpha20200802/work/gcc-11-20200802/gcc/lower-subreg.c:1821

[Bug target/96544] ICE in simplify_gen_subreg_concatn, at lower-subreg.c:717

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96544

--- Comment #1 from Arseny Solokha <asolokha at gmx dot com> ---
I cannot reproduce it anymore w/ gcc 13.0.0 20221016 snapshot
(g:6366e3e8847af98d4728d55951534769d034d02a) and w/ gcc 12.2.

[Bug target/96544] ICE in simplify_gen_subreg_concatn, at lower-subreg.c:717

[linkw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96544

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2022-10-27
     Ever confirmed|0                           |1
                 CC|                            |linkw at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org

--- Comment #2 from Kewen Lin <linkw at gcc dot gnu.org> ---
The bisection shows this issue was gone since r12-4428 (for fixing PR102682),
not sure if we want this to be backport-ed, CC Richi.