[LLVMdev] changing -mattr behavior with mmx and sse

Mon Ping Wang wangmp at apple.com
Wed Nov 19 23:57:31 PST 2008


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.

   -- Mon Ping

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