alpha failure on 920810-1

[Joern Rennecke]

>     (insn 9 8 10 (set (reg:DF 69)
>             (eq:DF (reg/v:DF 68)
>                 (const_double:DF (cc0) 0 0))) -1 (nil)
>         (nil))

Does this RTL actually describe correctly what is going on on the alpha?
Does in generate floating-point truth values, i.e. 1.0 for true?