[Bug tree-optimization/71083] Unaligned bit-field address when predictive commoning

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71083

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-05-12
          Component|c                           |tree-optimization
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed also on x86_64 (where it is harmless of course):

;; _19 = BIT_FIELD_REF <MEM[(struct lock_chain *)chain_11(D) + 1B], 24, 0>;

(insn 10 9 11 (set (reg:DI 99)
        (zero_extend:DI (mem:QI (plus:DI (reg/v/f:DI 98 [ chain ])
                    (const_int 1 [0x1])) [1 MEM[(struct lock_chain
*)chain_11(D) + 1B]+0 S1 A32]))) -1
     (nil))