[Bug tree-optimization/125390] [17 Regression][RISCV][RVV] ICE in cc1 during tree loop vectorization with -march=rv64gcv_zvl256b at -O2/-O3

[rdapp at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125390

Robin Dapp <rdapp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2026-05-20
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
                 CC|                            |rdapp at gcc dot gnu.org

--- Comment #1 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Confirmed.  Infinite loop during expand.

That's the optimized tree:

int main ()
{
  vector(4) int D.2944;
  vector(4) int vect_array.9[2];
  int f;
  vector(4) int _44(D);
  int _48;
  int _50;

  <bb 2> [local count: 214748370]:
  vect_array.9 = .MASK_LEN_LOAD_LANES (&c, 32B, { -1, -1, -1, -1 }, _44(D), 4,
0);
  _48 = BIT_FIELD_REF <vect_array.9[0], 32, 96>;
  _50 = BIT_FIELD_REF <vect_array.9[1], 32, 96>;
  vect_array.9 ={v} {CLOBBER};
  .MASK_LEN_STRIDED_STORE (&b, 8, { 0, 0, 0, 0 }, { -1, -1, -1, -1 }, 4, 0);
  f_13 = _48 ^ _50;
  a = f_13;
  return 0;

}