Simon Pilgrim 7f6cee9626 [X86][SSE] Improvements to byte shift shuffle matching
Since (v)pslldq / (v)psrldq instructions resolve to a single input argument it is useful to match it much earlier than we currently do - this prevents more complicated shuffles (notably insertion into a zero vector) matching before it.

Differential Revision: http://reviews.llvm.org/D6409



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222796 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-25 22:34:59 +00:00

Low Level Virtual Machine (LLVM)
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