[Bug target/100887] New: [12 Regression] ICE: in ix86_expand_vector_init_concat, at config/i386/i386-expand.c:14178 with -mavx512f and __builtin_shufflevector()

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100887

            Bug ID: 100887
           Summary: [12 Regression] ICE: in
                    ix86_expand_vector_init_concat, at
                    config/i386/i386-expand.c:14178 with -mavx512f and
                    __builtin_shufflevector()
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 50913
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50913&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -mavx512f testcase.c 
during RTL pass: expand
testcase.c: In function 'foo':
testcase.c:6:3: internal compiler error: in ix86_expand_vector_init_concat, at
config/i386/i386-expand.c:14178
    6 |   __builtin_shufflevector (u, v, 0);
      |   ^~~~~~~~~~~~~~~~~~~~~~~
0x7ddb42 ix86_expand_vector_init_concat
        /repo/gcc-trunk/gcc/config/i386/i386-expand.c:14178
0x149cf87 ix86_expand_vector_init(bool, rtx_def*, rtx_def*)
        /repo/gcc-trunk/gcc/config/i386/i386-expand.c:14622
0x18c32ee ???
        /repo/gcc-trunk/gcc/config/i386/sse.md:22289
0xce0ba6 rtx_insn* insn_gen_fn::operator()<rtx_def*, rtx_def*>(rtx_def*,
rtx_def*) const
        /repo/gcc-trunk/gcc/recog.h:407
0xce0ba6 store_constructor
        /repo/gcc-trunk/gcc/expr.c:7217
0xce2645 expand_constructor
        /repo/gcc-trunk/gcc/expr.c:8555
0xccea3a expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        /repo/gcc-trunk/gcc/expr.c:10738
0xcdbe6c store_expr(tree_node*, rtx_def*, int, bool, bool)
        /repo/gcc-trunk/gcc/expr.c:5986
0xcdd62d expand_assignment(tree_node*, tree_node*, bool)
        /repo/gcc-trunk/gcc/expr.c:5721
0xb97ef1 expand_gimple_stmt_1
        /repo/gcc-trunk/gcc/cfgexpand.c:3916
0xb97ef1 expand_gimple_stmt
        /repo/gcc-trunk/gcc/cfgexpand.c:4014
0xb9e79b expand_gimple_basic_block
        /repo/gcc-trunk/gcc/cfgexpand.c:6056
0xba06c7 execute
        /repo/gcc-trunk/gcc/cfgexpand.c:6782
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-1164-20210602094549-g659cc7d6320-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-1164-20210602094549-g659cc7d6320-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20210602 (experimental) (GCC)