Date: Tue, 14 Dec 1999 14:14:45 -0800 From: Jason Thorpe <thorpej@nas.nasa.gov> To: Wilko Bulte <wilko@yedi.iaf.nl> Cc: FreeBSD-alpha mailing list <freebsd-alpha@FreeBSD.ORG> Subject: Re: use of -mcpu=21164a Message-ID: <199912142214.OAA00903@lestat.nas.nasa.gov>
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On Tue, 14 Dec 1999 22:47:29 +0100
Wilko Bulte <wilko@yedi.iaf.nl> wrote:
> > Also, your assembler has to do the right thing; gas will treat the BWX
> > instructions are macros and open-code the equivalent in EV4 instructions
> > unless it is explicitly in EV56 (or greater) mode.
>
> So, in case of -mcpu=21164a gas will generate BWX and if -mcpu=21164a
> is omitted it will open-code in EV4 instructions?
Yes. (Of course, I'd rather it emitted an error, or a warning, at least...)
> what if I generate 'netboot' on a Miata with mcpu=m21164a and want to
> use the generated netboot on a Sandpiper (EV4)? There is no kernel (yet)
> to emulate BWX so I lose, right?
Right, if the compiler/assembler emitted BWX, you lose.
-- Jason R. Thorpe <thorpej@nas.nasa.gov>
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