[LLVMdev] MMX vs SSE

[Chris Lattner]

On Sep 8, 2010, at 3:08 PM, Dale Johannesen wrote:

> I'm working on changing the MMX implementation to use intrinsics in  
> all cases, which should stop various optimization passes from creating  
> MMX instructions that screw up the x87 stack.   Right now the MMX  
> instructions are split between X86InstrMMX.td and X86InstrSSE.td,  
> presumably on the historical grounds that some of them weren't  
> introduced until SSE or SSSE3, and require support for that feature to  
> work.  I'm thinking it would be cleaner to keep them all in  
> X86InstrMMX.  Does anyone have an opinion about this?

Sounds great, please do.  The X86 .td files need a reorganization in general, this sounds like a great first step.

-Chris