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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [patch][5/5] powerpc: Add the general support for Embedded
	Floating-Point instructions
Date: Fri, 12 Jan 2007 13:36:40 +0100
To: "Zhu Ebony-r57400" <ebony.zhu@freescale.com>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org
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> CONFIG_SPE doesn't force the whole math emulation to be built. If 
> CONFIG_SPE is set,
> only the new SPFP/DPFP/VSPFP instructions in arch/powerpc/math-emu 
> will be built,
> while the previous FPU instructions won't.

And the other way around I suppose.

> Therefore, what I'm trying to do is to build directory 
> arch/powerpc/math-emu if
> CONFIG_MATH_EMULATION or CONFIG_SPE is set. Do you have any idea?

Maybe you should really have a separate CONFIG_SPE_MATH_EMU?
Or that might complicate things more than it solves, dunno.


Segher