[PATCH] [X86][SSE] Generalised unpackl/unpckh shuffle matching

[Simon Pilgrim]

Moving this discussion back to phabricator.

Chandler - I can look at adding explicit (commuted) shuffle patterns if you prefer. The added test case 'shuffle_v4i32_40u1' was the start of all of this - canonicalization seemed to be forcing a commute preventing the lowering to punpckldq - the presense of the undefined lane seems to cause it.

The zmm test cases improved because of the poor handling of these shuffles so far.


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http://reviews.llvm.org/D7564

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