[Bug bootstrap/103971] New: [12 regression] build fails after r12-6420, ICE at libgfortran/generated/matmul_i1.c:2450

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103971

            Bug ID: 103971
           Summary: [12 regression] build fails after r12-6420, ICE at
                    libgfortran/generated/matmul_i1.c:2450
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:d3ff7420e941931d32ce2e332e7968fe67ba20af, r12-6420 

libtool: compile:  /home/seurer/gcc/git/build/gcc-trunk/./gcc/xgcc
-B/home/seurer/gcc/git/build/gcc-trunk/./gcc/
-B/home/seurer/gcc/git/install/gcc-trunk/powerpc64le-unknown-linux-gnu/bin/
-B/home/seurer/gcc/git/install/gcc-trunk/powerpc64le-unknown-linux-gnu/lib/
-isystem
/home/seurer/gcc/git/install/gcc-trunk/powerpc64le-unknown-linux-gnu/include
-isystem
/home/seurer/gcc/git/install/gcc-trunk/powerpc64le-unknown-linux-gnu/sys-include
-DHAVE_CONFIG_H -I. -I/home/seurer/gcc/git/gcc-trunk/libgfortran
-iquote/home/seurer/gcc/git/gcc-trunk/libgfortran/io
-I/home/seurer/gcc/git/gcc-trunk/libgfortran/../gcc
-I/home/seurer/gcc/git/gcc-trunk/libgfortran/../gcc/config
-I/home/seurer/gcc/git/gcc-trunk/libgfortran/../libquadmath -I../.././gcc
-I/home/seurer/gcc/git/gcc-trunk/libgfortran/../libgcc -I../libgcc
-I/home/seurer/gcc/git/gcc-trunk/libgfortran/../libbacktrace -I../libbacktrace
-I../libbacktrace -std=gnu11 -Wall -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -Wextra -Wwrite-strings
-Werror=implicit-function-declaration -Werror=vla -fcx-fortran-rules
-ffunction-sections -fdata-sections -ffast-math -ftree-vectorize -funroll-loops
--param max-unroll-times=4 -g -O2 -MT matmul_i1.lo -MD -MP -MF
.deps/matmul_i1.Tpo -c
/home/seurer/gcc/git/gcc-trunk/libgfortran/generated/matmul_i1.c  -fPIC -DPIC
-o .libs/matmul_i1.o
during GIMPLE pass: vect
/home/seurer/gcc/git/gcc-trunk/libgfortran/generated/matmul_i1.c: In function
'matmul_i1':
/home/seurer/gcc/git/gcc-trunk/libgfortran/generated/matmul_i1.c:2450:1:
internal compiler error: in operator[], at vec.h:889
 2450 | matmul_i1 (gfc_array_i1 * const restrict retarray,
      | ^~~~~~~~~
0x1022e357 vec<tree_node*, va_heap, vl_embed>::operator[](unsigned int)
        /home/seurer/gcc/git/gcc-trunk/gcc/vec.h:889
0x1022e357 vec<tree_node*, va_heap, vl_ptr>::operator[](unsigned int)
        /home/seurer/gcc/git/gcc-trunk/gcc/vec.h:1495
0x10fdf8d7 vec<machine_mode, va_heap, vl_ptr>::operator[](unsigned int) const
        /home/seurer/gcc/git/gcc-trunk/gcc/tree-vect-loop.c:2882
0x10fdf8d7 vect_analyze_loop_1
        /home/seurer/gcc/git/gcc-trunk/gcc/tree-vect-loop.c:2826
0x10fe008b vect_analyze_loop(loop*, vec_info_shared*)
        /home/seurer/gcc/git/gcc-trunk/gcc/tree-vect-loop.c:3057
0x11023efb try_vectorize_loop_1
        /home/seurer/gcc/git/gcc-trunk/gcc/tree-vectorizer.c:1047
0x11023efb try_vectorize_loop
        /home/seurer/gcc/git/gcc-trunk/gcc/tree-vectorizer.c:1162
0x11024b1b execute
        /home/seurer/gcc/git/gcc-trunk/gcc/tree-vectorizer.c:1278

commit d3ff7420e941931d32ce2e332e7968fe67ba20af (HEAD)
Author: Andre Vieira <andre.simoesdiasvieira@arm.com>
Date:   Thu Dec 2 14:34:15 2021 +0000

    [vect] Re-analyze all modes for epilogues