[LLVMdev] changing -mattr behavior with mmx and sse

[Mon Ping Wang]

This approach sounds better to me as well.

   -- Mon Ping

On Nov 20, 2008, at 10:41 AM, Chris Lattner wrote:

>
> On Nov 20, 2008, at 8:31 AM, Preston Gurd wrote:
>
>> Might you instead consider just adding a -disable-mmx option?
>
> I agree, this is a better approach.  This distinguishes between
> capabilities of the chip and the desire to codegen specific vectors
> one way or another.
>
> -Chris
>
>>
>> Preston
>>
>> On Thu, 2008-20-11 at 02:57 -0500, Mon Ping Wang wrote:
>>> Hi,
>>>
>>> When setting -mattr option on X86, I would like to treat MMX
>>> separately from SSE levels. This would allow a client who sets the
>>> attributes directly to set the SSE level independent of MMX, e.g.,
>>> llc
>>> -march=x86 -mattr=sse41, one would get sse4.1 with mmx disabled  
>>> while
>>> llc -march=x86 -mattr=mmx -mattr=sse42 will get mmx and sse42.  If
>>> anyone objects to this change, please let me know.
>>>
>>> Thanks,
>>>  -- Mon Ping
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>>
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