Re: PowerPC gas -many

[Kumar Gala <kumar dot gala at motorola dot com>]

I understand all this.  I guess my question is as a developer trying 
what is the rule of thumb with regards to -many?

For example, which mftb should work with just 'as -many', the classic 
or book-e form?
Also, for disassembly does AltiVec or SPE or the macc* take precedence?

- kumar

On Tuesday, September 2, 2003, at 09:32 AM, Alan Modra wrote:

> On Tue, Sep 02, 2003 at 08:38:47AM -0500, Kumar Gala wrote:
> > I'm also concerned about the use of -many.  For example, between 
> > Book-E
> > and classic PPC mftb changes encoding.  I'm not sure what expectation
> > users have today with -many, but it may be more confusion when
> > conflicts arise that the 'default' behavior is not what they expect
> > based on their focus.
>
> With the patch I posted, you can set the default.  eg. as -m440 -many.
>
> >  Also, disassembly is a nightmare with -many.
>
> No one is forcing you to use -Many.  It's a new option for the
> disassembler.
>
> > I'm pretty sure between AltiVec / SPE / macc* there are over lapping
> > opcodes and which one should get precedences?
>
> Yes, it's true there are overlapping opcodes.  If you know you are
> disassembling SPE code, use -Me500.  Or -Me500 -Many to get SPE plus
> others, with SPE taking precedence.
>
> --
> Alan Modra
> IBM OzLabs - Linux Technology Centre