https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120201
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2025-05-09
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Partition 0: size 384 align 16
transforms
That looks correct.
But this looks wrong:
;; [t.cc:17:20] _34 = [t.cc:17:20] MEM <vector(64) unsigned char> [(char *
{ref-all})&transforms];
(insn 98 97 0 (set (reg:V64QI 111 [ _34 ])
(mem/c:V64QI (plus:DI (reg:DI 899)
(const_int -448 [0xfffffffffffffe40])) [0 [t.cc:17:20] MEM
<vector(64) unsigned char> [(char * {ref-all})&transforms]+0 S64 A512]))
"t.cc":17:20 -1
(nil))
Notice the 512 bit alignment.
But the alignment is correct in gimple:
_34 = __MEM <unsigned char [[gnu::vector_size(64)]], 8> ((char *
{ref-all})&transforms);
Note the 8 which is 128 bit aligned.
Note this needs -march=znver4 as -march=skylake-avx512 does not unroll the loop
(I have not looked why though).
