[PATCH] [X86][SSE] Improved (v)insertps shuffle matching

[Simon Pilgrim]

Thanks for the feedback guys - apologies for the code style problems, they should be fixed now.

Regarding performance - its tricky to give specific numbers as insertps gets matched against a wide variety of masks, but if we assume that an insertps instruction replaces a xorps (zero) and 2 dependant shufps, on a brief test I'm seeing a 35% boost on Core2Duo.


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  rL LLVM

http://reviews.llvm.org/D6879

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