[Bug target/128000] AArch64: 16-byte __builtin_memcpy uses ldp/stp of X registers instead of ldr/str of a Q register

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128000

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ra
   Last reconfirmed|                            |2026-10-19
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(insn 7 4 8 2 (set (reg:TI 101 [ _1 ])
        (mem:TI (reg/v/f:DI 103 [ s ]) [0 [t.c:3:5] MEM <uint128_t> [(char *
{ref-all})s_3(D)]+0 S16 A8])) "t.c":3:5 -1
     (nil))
(insn 8 7 0 2 (set (mem:TI (reg/v/f:DI 102 [ d ]) [0 MEM <uint128_t> [(char *
{ref-all})d_4(D)]+0 S16 A8])
        (reg:TI 101 [ _1 ])) "t.c":3:5 -1
     (nil))


So it looks like a RA issue.  TImode can fit into a V register too.