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Re: [RFC] Optimize swab operations on mips_r2 cpu

To: "Kevin D. Kissell" <kevink@mips.com>, Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [RFC] Optimize swab operations on mips_r2 cpu
From: Franck <vagabon.xyz@gmail.com>
Date: Fri, 27 Jan 2006 18:32:15 +0100
Cc: Nigel Stephens <nigel@mips.com>, linux-mips@linux-mips.org
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2006/1/27, Kevin D. Kissell <kevink@mips.com>:
>
> ifdef CONFIG_CPU_SMARTMIPS
> cflags-$(CONFIG_CPU_MIPS32R1)   += \
>                         $(call 
> set_gccflags,mips32,smartmips,4kec,mips3,mips2)\
>                         -Os, -Wa,--trap
>
> cflags-$(CONFIG_CPU_MIPS32R2)   += \
>                         $(call set_gccflags,4ksd,mips32r2,4kec,mips3,mips2) \
>                         -Wa,--trap
> else
> cflags-$(CONFIG_CPU_MIPS32R1)   += \
>                         $(call set_gccflags,mips32,mips32,r4600,mips3,mips2) \
>                         -Wa,--trap
>
> cflags-$(CONFIG_CPU_MIPS32R2)   += \
>                         $(call 
> set_gccflags,mips32r2,mips32r2,r4600,mips3,mips2)
>  \
>                         -Wa,--trap
> endif
>
>
> That's almost certainly not the cleanest way to do it (and I really don't know
> if the values I threw in for the MIPS32R1+SmartMIPS (e.g. 4KSc) combination
> would actually work.  I just want to point out that it isn't that hard to do.

I agree it's not hard to do. But it becomes more tricky if you want
something clean that gives best results for every cpus...Moreover I
don't think your solution avoids maintenence problems IMHO.

Ralf, could you give your opinion ?

Thanks
--
               Franck

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