[Bug target/113657] [14 Regression] ICE Segmentation fault with -mstrict-align and __arm_data512_t since r14-1187-gd6b756447cd58b

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113657

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-01-30
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

8229                simplify_gen_subreg (TImode, operands[1], V8DImode, offset)

(gdb) p debug_rtx(operands[1])
(mem:V8DI (reg/f:DI 0 x0 [101]) [1 *ptr_2(D)+0 S64 A64])
$4 = void
(gdb) p offset
$5 = 0

That is due to:
/* V8DI mode.  */
VECTOR_MODE_WITH_PREFIX (V, INT, DI, 8, 5);
ADJUST_ALIGNMENT (V8DI, 8);


So maybe for strict alignment, we need to loop using DImode instead of TImode
and hope ldp/stp pass optimizes it back into load/store pairs ...