https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100253
--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Andrew Pinski from comment #2)
> The problem is right away in expand:
> ;; vect__36.383_12 = MEM <vector(1) __int128 unsigned> [(char *
> {ref-all})_10 + 16B];
>
> (insn 23 22 0 (set (reg:V1TI 88 [ vect__36.383 ])
> (mem:V1TI (plus:DI (reg/f:DI 86 [ _10 ])
> (const_int 16 [0x10])) [0 MEM <vector(1) __int128 unsigned>
> [(char * {ref-all})_10 + 16B]+0 S16 A128])) -1
> (nil))
>
>
> I think SLP did not mark the load as unaligned even though it knows it is
> one:
But gimple tree is marked as aligned.
<mem_ref 0x7fffe94a72d0
type <vector_type 0x7fffe9a59150
type <integer_type 0x7fffea300a80 __int128 unsigned public unsigned
type_6 TI
size <integer_cst 0x7fffea2e2f00 constant 128>
unit-size <integer_cst 0x7fffea2e2f18 constant 16>
align:128 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffea300a80 precision:128 min <integer_cst 0x7fffea3031f8 0> max
<integer_cst 0x7fffea2f6870 0xffffffffffffffffffffffffffffffff>
pointer_to_this <pointer_type 0x7fffe9a4c150>>
unsigned V1TI size <integer_cst 0x7fffea2e2f00 128> unit-size
<integer_cst 0x7fffea2e2f18 16>
align:128 warn_if_not_align:0 symtab:0 alias-set 31 canonical-type
0x7fffe9a59150 nunits:1
pointer_to_this <pointer_type 0x7fffe9a4c2a0>>
arg:0 <ssa_name 0x7fffe947ad38
type <pointer_type 0x7fffea30c498 type <integer_type 0x7fffea30c3f0
char>
sizes-gimplified public unsigned type_6 DI
size <integer_cst 0x7fffea2e2eb8 constant 64>
unit-size <integer_cst 0x7fffea2e2ed0 constant 8>
align:64 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
0x7fffea30c498>
visited
def_stmt _11 = &g + _214;
version:11
ptr-info 0x7fffe9487330>
arg:1 <integer_cst 0x7fffe949bf18 type <pointer_type 0x7fffe9a4c888>
constant 16>>
