https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101845
Tejas Belagod <belagod at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-08-11
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
CC| |belagod at gcc dot gnu.org
--- Comment #1 from Tejas Belagod <belagod at gcc dot gnu.org> ---
Confirmed.
(insn 11 10 12 2 (set (reg:V8QI 92 [ _1 ])
(mult:V8QI (reg:V8QI 100)
(reg/v:V8QI 97 [ v ]))) "shuf.c":11:35 -1
(nil))
(insn 12 11 13 2 (set (reg:V8QI 102)
(const_vector:V8QI [
(const_int -1 [0xffffffffffffffff]) repeated x8
])) -1
(nil))
// Overwriting 92 [_1] looks suspicious?!
(insn 13 12 14 2 (set (subreg:V4HI (reg:V8QI 92 [ _1 ]) 0)
(subreg:V4HI (reg:V8QI 102) 0)) -1
(nil))
// Seems like merging 92 into itself leads to the wrong code...
(insn 14 13 15 2 (set (subreg:V4HI (reg:V8QI 92 [ _1 ]) 0)
(vec_merge:V4HI (vec_duplicate:V4HI (vec_select:HI (subreg:V4HI
(reg:V8QI 92 [ _1 ]) 0)
(parallel [
(const_int 0 [0])
])))
(subreg:V4HI (reg:V8QI 92 [ _1 ]) 0)
(const_int 1 [0x1]))) -1
(nil))
