[PATCH] [X86][SSE] Vectorized i64 uniform constant SRA shifts

[Simon Pilgrim]

In http://reviews.llvm.org/D9645#170039, @delena wrote:

> I disagree with this approach. You can prepare a separate patch for "shift-right-64bits" optimization.
>  But you should not use shift-right in SEXT and generate 10 instructions instead of 3.


I haven't intentionally added these shift-right in the sext tests - its just a result of the default sign-ext expansion from SIGN_EXTEND_INREG. I still think this is an improvement over where we are now but I'll push the pmovsx* patch up for review as soon as I can and revisit this afterwards.


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http://reviews.llvm.org/D9645

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