Re: [RFC] Optimize swab operations on mips_r2 cpu

[Nigel Stephens <nigel@mips.com>]

Franck wrote:

>2006/1/26, Nigel Stephens <nigel@mips.com>:
>  
>
>>You could, but why not stick with -march=4ksd if that's your CPU of
>>choice? It appears to result in  marginally smaller code even when using
>>-Os, and should have (slightly) better performance than a generic
>>mips32r2 kernel?
>>
>>    
>>
>
>Just to avoid a new CPU_4KSD definition in the kernel code as
>suggested by Kevin. Basically all mips32r2 specific code is the same
>as 4ksd specific code (except the code that deals with SmartMIPS
>extension). So it can use CONFIG_CPU_MIPS32_R2 macro.
>

Not that I'm a Linux hacker, but aren't those separate things? Can't you 
compile with -march=4ksd to get the CPU-specific compiler optimisations, 
but then use the more generic CONFIG_CPU_MIPSR2 and/or 
CONFIG_CPU_SMARTMIPS to select the appropriate code inside the kernel 
source (i.e. no need for CONFIG_CPU_4KSD)?

Nigel