[Bug ipa/68367] New: ICE in vectorizable_load, at tree-vect-stmts.c:6711

["clyon at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68367

            Bug ID: 68367
           Summary: ICE in vectorizable_load, at tree-vect-stmts.c:6711
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: clyon at gcc dot gnu.org
  Target Milestone: ---

Created attachment 36718
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36718&action=edit
matmul_i4.i

Since r230311:
        PR ipa/68311
        * ipa-icf.c (sem_item_optimizer::traverse_congruence_split):
        Replace ctor with auto_vec and initialization in a loop.

I noticed an ICE in vectorizable_load, at tree-vect-stmts.c:6711 when compiling
libgfortran (libgfortran/generated/matmul_i4.c).

I observed this when gcc is configured with:
--target=armeb-none-linux-gnueabihf
--with-float=hard
--with-mode=arm
--with-cpu=cortex-a9
--with-fpu=neon

Using --target=arm-none-linux-gnueabihf works.

The backtrace is:

/home/christophe.lyon/src/GCC/sources/gcc-fsf/trunk-for-crontab/libgfortran/generated/matmul_i4.c:
In function 'matmul_i4':
/home/christophe.lyon/src/GCC/sources/gcc-fsf/trunk-for-crontab/libgfortran/generated/matmul_i4.c:79:1:
internal compiler error: in vectorizable_load, at tree-vect-stmts.c:6711
 matmul_i4 (gfc_array_i4 * const restrict retarray,
 ^~~~~~~~~

0xfeb563 vectorizable_load
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf/trunk-for-crontab/gcc/tree-vect-stmts.c:6711
0xfef559 vect_transform_stmt(gimple*, gimple_stmt_iterator*, bool*, _slp_tree*,
_slp_instance*)
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf/trunk-for-crontab/gcc/tree-vect-stmts.c:8002
0x10074d5 vect_transform_loop(_loop_vec_info*)
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf/trunk-for-crontab/gcc/tree-vect-loop.c:6793
0x101e3ef vectorize_loops()
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf/trunk-for-crontab/gcc/tree-vectorizer.c:548
0xf019ab execute
       
/home/christophe.lyon/src/GCC/sources/gcc-fsf/trunk-for-crontab/gcc/tree-ssa-loop.c:273
Please submit a full bug report,

Using options -ftree-vectorize  -O2 is sufficient to create the ICE.