https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102133
--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #4)
> >
> > and it hit REG_P (XEXP (x, 1)), XEXP (x, 1) is invalid for subreg, so
> > set_rtl here doesn't accept subreg?
>
> typo, it hit gcc_assert that if X is not REG, it must be CONCAT or PARALLEL,
> but here is SUBREG, so gcc_assert failed.
in extract_bit_bitfield_1
target: (reg/v:DF 153)
op0: (mem/c:DF (plus:SI (reg/f:SI 103 virtual-incoming-args)
(const_int 24 [0x18])) [1 d+0 S8 A32])
in good case, it will move op0 to target by 2 32-bit loads
---cut from extract_integral_bit_field-----
/* Handle fields bigger than a word. */
if (bitsize > BITS_PER_WORD)
{
/* Here we transfer the words of the field
in the order least significant first.
This is because the most significant word is the one which may
be less than full. */
--------cut end-------
after my changed, it will return (subreg:DF (reg: DI 0))
