[Bug target/46878] V850 ICE in in maybe_add_or_update_dep_1, at sched-deps.c:854

["law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46878

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |law at redhat dot com

--- Comment #6 from Jeffrey A. Law <law at redhat dot com> 2011-01-18 13:43:10 UTC ---
Why is the comparison marked with SCHED_GROUP_P?  I think that's your
underlying problem as SCHED_GROUP_P indicates the current insn must be
scheduled with the previous insn.  But there is no previous insn in the block.

(gdb) p debug_bb_n (4)
;; basic block 4, loop depth 0, count 0
;; prev block 3, next block 5
;; pred:       2 [50.0%] 
;; succ:       7 [78.4%]  5 [21.6%]  (fallthru)
;; bb 4 artificial_defs: { }
;; bb 4 artificial_uses: { u17(3){ }u18(29){ }u19(34){ }u20(35){ }}
;; lr  in       3 [sp] 29 [r29] 34 [.fp] 35 [.ap] 43 47 48
;; lr  use      3 [sp] 29 [r29] 34 [.fp] 35 [.ap] 43 47
;; lr  def      42 44
;; live  in       3 [sp] 29 [r29] 34 [.fp] 35 [.ap] 43 47 48
;; live  gen      42 44
;; live  kill    

(code_label 20 62 21 4 2 "" [1 uses])
(note 21 20 22 4 [bb 4] NOTE_INSN_BASIC_BLOCK)
(note 22 21 23 4 NOTE_INSN_DELETED)
(insn/s 23 22 60 4 (set (reg/v:SI 44 [ c ])
        (ne:SI (cc0)
            (const_int 0 [0]))) j.c:10 40 {*setcc}
     (nil))
(note 60 23 59 4 NOTE_INSN_DELETED)
(insn 59 60 30 4 (set (reg/v/f:SI 42 [ tmpp ])
        (if_then_else:SI (ne (reg:SI 43 [ D.1959 ])
                (const_int 1 [0x1]))
            (reg/v/f:SI 47 [ op ])
            (const_int 0 [0]))) j.c:15 46 {*movsicc_normal}
     (expr_list:REG_DEAD (reg/v/f:SI 47 [ op ])
        (expr_list:REG_DEAD (reg:SI 43 [ D.1959 ])
            (nil))))
(insn 30 59 31 4 (set (cc0)
        (compare (reg/v/f:SI 42 [ tmpp ])
            (const_int 0 [0]))) j.c:16 16 {cmpsi_insn}
     (expr_list:REG_DEAD (reg/v/f:SI 42 [ tmpp ])
        (nil)))
(jump_insn 31 30 32 4 (set (pc)
        (if_then_else (ne (cc0)
                (const_int 0 [0]))
            (label_ref:SI 50)
            (pc))) j.c:16 53 {*branch_normal}
     (expr_list:REG_BR_PROB (const_int 7837 [0x1e9d])
        (nil))
 -> 50)
;; lr  out      3 [sp] 29 [r29] 34 [.fp] 35 [.ap] 44 48
;; live  out      3 [sp] 29 [r29] 34 [.fp] 35 [.ap] 44 48



Note the /s on insn 23.  That's SCHED_GROUP_P.