[Bug middle-end/53411] [4.8 Regression] ICE in move_unallocated_pseudos

[bernds at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53411

--- Comment #3 from Bernd Schmidt <bernds at gcc dot gnu.org> 2012-05-21 
16:52:06 UTC ---
Odd. The following is in 190r.asmcons:

(insn 39 51 141 3 (set (reg:DI 135 [ D.1745 ])
        (sign_extend:DI (reg:SI 132 [ j ]))) regehr.c:22 122
{*extendsidi2_rex64}
     (expr_list:REG_DEAD (reg:SI 132 [ j ])
        (expr_list:REG_UNUSED (reg:DI 135 [ D.1745 ])
            (nil))))

That insn has no purpose. We then run delete_trivially_dead_insns in IRA... but
it happens after find_moveable_pseudos, and probably needs to happen before as
well.