https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107949
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2022-12-02
Component|target |rtl-optimization
Target|powerpc |powerpc, aarch64
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
aarch64 has the same issue (with almost the same RTL even)
(insn 6 3 7 2 (set (reg:QI 123 [ *inp_5(D) ])
(mem:QI (reg/v/f:SI 121 [ inp ]) [0 *inp_5(D)+0 S1 A8]))
"/app/example.cpp":4:17 554 {*movqi_internal}
(nil))
(insn 7 6 8 2 (set (reg:QI 124 [ MEM[(const unsigned char *)inp_5(D) + 1B] ])
(mem:QI (plus:SI (reg/v/f:SI 121 [ inp ])
(const_int 1 [0x1])) [0 MEM[(const unsigned char *)inp_5(D) +
1B]+0 S1 A8])) "/app/example.cpp":4:17 554 {*movqi_internal}
(expr_list:REG_DEAD (reg/v/f:SI 121 [ inp ])
(nil)))
(insn 8 7 9 2 (set (reg:SI 125)
(xor:SI (subreg:SI (reg:QI 123 [ *inp_5(D) ]) 0)
(subreg:SI (reg:QI 124 [ MEM[(const unsigned char *)inp_5(D) + 1B]
]) 0))) "/app/example.cpp":4:17 215 {*boolsi3}
(expr_list:REG_DEAD (reg:QI 124 [ MEM[(const unsigned char *)inp_5(D) +
1B] ])
(expr_list:REG_DEAD (reg:QI 123 [ *inp_5(D) ])
(nil))))
(note 9 8 21 2 NOTE_INSN_DELETED)
(insn 21 9 22 2 (set (reg:SI 3 3)
(const_int 0 [0])) "/app/example.cpp":5:1 549 {*movsi_internal1}
(nil))
(insn 22 21 17 2 (set (reg:SI 4 4 [orig:3+4 ] [3])
(zero_extend:SI (subreg:QI (reg:SI 125) 3))) "/app/example.cpp":5:1 4
{zero_extendqisi2}
(expr_list:REG_DEAD (reg:SI 125)
(nil)))
We lose track (didn't take into account LOAD_EXTEND_OP(QImode) is ZERO_EXTEND
?) that the memory was zero extended.
