[RFC PATCH] Add support for sparc compare-and-branch.

[David Miller]

From: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Date: Mon, 15 Oct 2012 16:44:44 +0200

> David Miller <davem@davemloft.net> writes:
> 
>>>> I'm just calling it VIS4 in GCC so that we can export intrinsics of,
>>>> for example, the cryptographic instructions at some point using the
>>>> __VIS__ version CPP tests.
>>> 
>>> ...that's why I'm not sure we should invent VIS4 at this point.  How is this 
>>> done on the Solaris Studio side?  Couldn't we add a new architecture to the 
>>> compiler (-mcpu=sparc4, with -mcpu=niagara4 as first variant), and define 
>>> __sparc4__ for the preprocessor?
>>
>> I've scanned the documentation and there is no indication of any preprocessor
>> predefines or anything like that.
>>
>> And keep in mind that __VIS__ is our very own invention.
>>
>> Sun's compilers never predefined this.
> 
> I've found uses of e.g. __VIS >= 0x200 in their Studio 12.3 headers
> (prod/include/cc/sys/vis_*.h), and strings on the cc binary reveals
> 
> -D__VIS=0x100
> -D__VIS=0x200
> -D__VIS=0x300
> -D__VIS=0x400
> 
> I haven't yet found if those are properly documented, though.

Strange, ok.