Simon Pilgrim 97a4820ccd [X86][SSE] Added common helper for shuffle mask constant pool decodes.
The shuffle mask decodes have a large amount of repeated code extracting/splitting mask values from Constant data.

This patch pulls all of this duplicated code into a single helper function to identify undef elements and combine/split constant integer data into the requested shuffle mask elements.

Updated PSHUFB/VPERMIL/VPERMIL2/VPPERM decoders to use it (VPERMV/VPERMV3 could be converted as well in the future).

llvm-svn: 282720
2016-09-29 15:25:48 +00:00
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