[Bug target/108892] [13 Regression] ICE: in curr_insn_transform, at lra-constraints.cc:4168 (unable to generate reloads for: {*mvconst_internal}) at -Og on riscv64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108892

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |blocker

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The backend is really broken:
(define_insn_and_split "*mvconst_internal"
  [(set (match_operand:GPR 0 "register_operand" "=r")
        (match_operand:GPR 1 "splittable_const_int_operand" "i"))]
  "!(p2m1_shift_operand (operands[1], <MODE>mode)
     || high_mask_shift_operand (operands[1], <MODE>mode))"
  "#"
  "&& 1"
  [(const_int 0)]
{
  riscv_move_integer (operands[0], operands[0], INTVAL (operands[1]),
                      <MODE>mode, TRUE);
  DONE;
})


There are multiple insn patterns which match and guess what it is just broken.