[Bug middle-end/110443] New: [14 Regression] ICE on a52dec-0.7.4:

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110443

            Bug ID: 110443
           Summary: [14 Regression] ICE on a52dec-0.7.4:
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at gcc dot gnu.org
  Target Milestone: ---

Noticerd ICE on a52dec-0.7.4 against gcc r14-2134-g231f6b56c77c50. Extracted
minimal example is:

Extracted reproducer:

// $ cat bug.c.c
typedef struct {
  float real;
  float imag;
} complex_t;
char fftorder[] = {};
float *a52_imdct_256_data;
int a52_imdct_256_i, a52_imdct_256_k;
float a52_imdct_256_b_r;
void a52_imdct_256() {
  complex_t buf1[64];
  a52_imdct_256_i = 0;
  for (; a52_imdct_256_i < 64; a52_imdct_256_i++) {
    a52_imdct_256_k = fftorder[a52_imdct_256_i];
    buf1[a52_imdct_256_i].real = buf1[a52_imdct_256_i].imag =
        a52_imdct_256_data[a52_imdct_256_k];
  }
  a52_imdct_256_b_r = buf1[0].real * buf1[0].imag;
}

$ gcc -O2 -c bug.c.c -o bug.o
during GIMPLE pass: vect
bug.c.c: In function 'a52_imdct_256':
bug.c.c:9:6: internal compiler error: Segmentation fault
    9 | void a52_imdct_256() {
      |      ^~~~~~~~~~~~~
0x1bc5d04 diagnostic_impl(rich_location*, diagnostic_metadata const*, int, char
const*, __va_list_tag (*) [1], diagnostic_t)
        ???:0
0x1bc6277 internal_error(char const*, ...)
        ???:0
0xcca64f crash_signal(int)
        ???:0
0x1a84a18 vect_get_gather_scatter_ops(_loop_vec_info*, loop*, _stmt_vec_info*,
_slp_tree*, gather_scatter_info*, tree_node**, vec<tree_node*, va_heap,
vl_ptr>*)
        ???:0
0x1a92fb2 vectorizable_load(vec_info*, _stmt_vec_info*, gimple_stmt_iterator*,
gimple**, _slp_tree*, vec<stmt_info_for_cost, va_heap, vl_ptr>*)
        ???:0
0x1aa01d8 vect_transform_stmt(vec_info*, _stmt_vec_info*,
gimple_stmt_iterator*, _slp_tree*, _slp_instance*)
        ???:0
0xf2ab57 vect_schedule_slp_node(vec_info*, _slp_tree*, _slp_instance*)
        ???:0
0xf3abcb vect_schedule_scc(vec_info*, _slp_tree*, _slp_instance*,
hash_map<_slp_tree*, slp_scc_info,
simple_hashmap_traits<default_hash_traits<_slp_tree*>, slp_scc_info> >&, int&,
vec<_slp_tree*, va_heap, vl_ptr>&)
        ???:0
0xf3a812 vect_schedule_scc(vec_info*, _slp_tree*, _slp_instance*,
hash_map<_slp_tree*, slp_scc_info,
simple_hashmap_traits<default_hash_traits<_slp_tree*>, slp_scc_info> >&, int&,
vec<_slp_tree*, va_heap, vl_ptr>&)
        ???:0
0xf3b166 vect_schedule_slp(vec_info*, vec<_slp_instance*, va_heap, vl_ptr>
const&)
        ???:0
0xf0f23b vect_transform_loop(_loop_vec_info*, gimple*)
        ???:0
0xf4833b vect_transform_loops(hash_table<simduid_to_vf, false, xcallocator>*&,
loop*, gimple*, function*)
        ???:0
0xf489db try_vectorize_loop(hash_table<simduid_to_vf, false, xcallocator>*&,
unsigned int*, loop*, function*)
        ???:0
0xf48f34 (anonymous namespace)::pass_vectorize::execute(function*)
        ???:0

$ gcc -v
Using built-in specs.
COLLECT_GCC=/<<NIX>>/gcc-14.0.0/bin/gcc
COLLECT_LTO_WRAPPER=/<<NIX>>/gcc-14.0.0/libexec/gcc/x86_64-unknown-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with:
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 99999999 (experimental) (GCC)