[LLVMdev] changing -mattr behavior with mmx and sse

[Chris Lattner]

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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