[LLVMdev] changing -mattr behavior with mmx and sse

Preston Gurd pgurd at rapidmind.com
Thu Nov 20 08:31:19 PST 2008

Might you instead consider just adding a -disable-mmx option?


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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