[Bug tree-optimization/97466] New: ICE in vect_get_and_check_slp_defs, at tree-vect-slp.c:538 (at -O3)

[su at cs dot ucdavis.edu via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97466

            Bug ID: 97466
           Summary: ICE in vect_get_and_check_slp_defs, at
                    tree-vect-slp.c:538 (at -O3)
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

[503] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20201016 (experimental) [master revision
3e8d8f3b883:93f23a96b87:02629b116eed7c6911ef0eb2ef97e1883e9fb1de] (GCC) 
[504] % 
[504] % gcctk -O2 small.c
[505] % 
[505] % gcctk -O3 small.c
during GIMPLE pass: vect
small.c: In function ‘main’:
small.c:59:5: internal compiler error: in vect_get_and_check_slp_defs, at
tree-vect-slp.c:538
   59 | int main () {
      |     ^~~~
0xfdf1ee vect_get_and_check_slp_defs
        ../../gcc-trunk/gcc/tree-vect-slp.c:536
0xfe4c11 vect_build_slp_tree_2
        ../../gcc-trunk/gcc/tree-vect-slp.c:1443
0xfe36e9 vect_build_slp_tree
        ../../gcc-trunk/gcc/tree-vect-slp.c:1266
0xfe4d2c vect_build_slp_tree_2
        ../../gcc-trunk/gcc/tree-vect-slp.c:1486
0xfe36e9 vect_build_slp_tree
        ../../gcc-trunk/gcc/tree-vect-slp.c:1266
0xfe4d2c vect_build_slp_tree_2
        ../../gcc-trunk/gcc/tree-vect-slp.c:1486
0xfe36e9 vect_build_slp_tree
        ../../gcc-trunk/gcc/tree-vect-slp.c:1266
0xfeae71 vect_analyze_slp_instance
        ../../gcc-trunk/gcc/tree-vect-slp.c:2135
0xfee1da vect_analyze_slp(vec_info*, unsigned int)
        ../../gcc-trunk/gcc/tree-vect-slp.c:2441
0xfcde42 vect_analyze_loop_2
        ../../gcc-trunk/gcc/tree-vect-loop.c:2262
0xfcde42 vect_analyze_loop(loop*, vec_info_shared*)
        ../../gcc-trunk/gcc/tree-vect-loop.c:2799
0xff679c try_vectorize_loop_1
        ../../gcc-trunk/gcc/tree-vectorizer.c:994
0xff7269 vectorize_loops()
        ../../gcc-trunk/gcc/tree-vectorizer.c:1226
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.
[506] % 
[506] % cat small.c
struct b {
  int c;
  char e;
  char f;
  unsigned g;
};

struct h {
  int i : 2;
};

static short j = 5;
static int k, l, m, ah;
static char n;
static struct b o, p;
int *q;
static int **r = &q;
char s;
static struct h t;
short u;

unsigned char a (unsigned char v, unsigned char w) {
  return w ? v % w : 0;
}

void ac () {
  ah = 0 >= t.i;
  while (n)
    ;
}

short d (short v) { return v; }

static int x () {
  int y;
  char aa;
  int *ab = &k;
  o.f = 0;
  while (!j)
    ;
  ac();
  while (s) {
    char ad;
    int ae;
    p.e = ad = 7;
    for (; ad; ad--) {
      unsigned af = 4;
      ae = 1;
      for (; ae >= 0; ae--) {
        aa = a ((p.g == (l >= af) || y), *ab);
        **r ^= (d ((m < o.c) ^ aa) == 0) ^ u;
      }
    }
    *ab = 0;
  }
  return 0;
}

int main () {
  x();
  return 0;
}