[Bug debug/45849] [4.6 Regression] ICE: in emit_note_insn_var_location, at var-tracking.c:7336 with -O -g

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45849

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-10-01 
12:11:56 UTC ---
The expressions seem to be equivalent, but not something rtx_equal_p recognizes
as equivalent:
(gdb) p debug_rtx (*note_slot)
(var_location len (plus:DI (minus:DI (mult:DI (minus:DI (reg/v/f:DI 6 bp
[orig:76 rp ] [76])
                (reg/v/f:DI 42 r13 [orig:66 matchstart ] [66]))
            (reg/v:DI 43 r14 [orig:62 repllen ] [62]))
        (reg/v/f:DI 41 r12 [orig:61 text ] [61]))
    (reg/v/f:DI 42 r13 [orig:66 matchstart ] [66])))
$4 = void
(gdb) p debug_rtx (note_vl)
(var_location len (plus:DI (mult:DI (minus:DI (reg/v/f:DI 6 bp [orig:76 rp ]
[76])
            (reg/v/f:DI 42 r13 [orig:66 matchstart ] [66]))
        (reg/v:DI 43 r14 [orig:62 repllen ] [62]))
    (minus:DI (reg/v/f:DI 42 r13 [orig:66 matchstart ] [66])
        (reg:DI 41 r12))))
$5 = void

Will try to debug where this difference comes from.