[RFA/alpha] Add handling of FP control insn in software-single step

[Joel Brobecker <brobecker at adacore dot com>]

Hello,

We noticed that alpha-tdep.c:alpha_next_pc() did have any support for
FP control (branch) instructions. So single-steping over instructions
such as fbeq was not always working properly since the target address
was not always following the potential jump.

The attached patch should fix this.

2005-05-17  Joel Brobecker  <brobecker@adacore.com>

        * alpha-tdep.c (fp_register_zero_p): New function.
        (fp_register_sign_bit): New function.
        (alpha_next_pc): Add support for floating-point control instructions.

Tested on alpha-tru64 5.1a with no regression. It fixes a problem with
some code but I can't contribute it, as it has been given to us by a
customer.

OK to apply?

Thanks,
-- 
Joel

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