https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99041
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-02-09
--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
This looks like a combine issue. Before combine, we have:
(insn 124 123 125 3 (set (reg:V2DF 198 [ MEM <ax> [(void *)_75] ])
(mem:V2DF (reg:DI 149 [ ivtmp.49 ]) [0 MEM <ax> [(void *)_75]+0 S16
A8])) "bug.ii":22:67 1130 {vsx_movv2df_64bit}
(nil))
(insn 125 124 126 3 (set (reg:DI 199)
(plus:DI (reg:DI 142 [ _63 ])
(reg:DI 149 [ ivtmp.49 ]))) "bug.ii":22:67 66 {*adddi3}
(nil))
(insn 126 125 127 3 (set (reg:V2DF 200 [ MEM <ax> [(void *)_24 + _16 * 1] ])
(mem:V2DF (plus:DI (reg:DI 199)
(reg:DI 197)) [0 MEM <ax> [(void *)_24 + _16 * 1]+0 S16 A8]))
"bug.ii":22:67 1130 {vsx_movv2df_64bit}
(expr_list:REG_DEAD (reg:DI 199)
(nil)))
(insn 127 126 128 3 (set (reg:OO 138 [ _41 ])
(unspec:OO [
(subreg:V16QI (reg:V2DF 198 [ MEM <ax> [(void *)_75] ]) 0)
(subreg:V16QI (reg:V2DF 200 [ MEM <ax> [(void *)_24 + _16 * 1]
]) 0)
] UNSPEC_MMA_ASSEMBLE)) 2074 {*mma_assemble_pair}
(expr_list:REG_DEAD (reg:V2DF 200 [ MEM <ax> [(void *)_24 + _16 * 1] ])
(expr_list:REG_DEAD (reg:V2DF 198 [ MEM <ax> [(void *)_75] ])
(nil))))
After combine, we have:
(note 124 123 125 3 NOTE_INSN_DELETED)
(note 125 124 126 3 NOTE_INSN_DELETED)
(note 126 125 127 3 NOTE_INSN_DELETED)
(insn 127 126 128 3 (set (reg:OO 138 [ _41 ])
(unspec:OO [
(mem:V16QI (reg:DI 149 [ ivtmp.49 ]) [0 MEM <ax> [(void
*)_75]+0 S16 A8])
(mem:V16QI (plus:DI (plus:DI (reg:DI 142 [ _63 ])
(reg:DI 149 [ ivtmp.49 ]))
(reg:DI 197)) [0 MEM <ax> [(void *)_24 + _16 * 1]+0 S16
A8])
] UNSPEC_MMA_ASSEMBLE)) 2074 {*mma_assemble_pair}
(nil))
That bad address on the 2nd mem then makes it all the way to LRA which
eventually dies when it calls decompose_normal_address on it.
Segher, is combine allowed to create invalid addresses like that and LRA is
supposed to fix it up or is this really a combine issue?
