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Commit d590de29 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] Use getTargetConstantBitsFromNode to find zeroable shuffle elements. 

Replaces existing approach that could only search BUILD_VECTOR nodes.

Requires getTargetConstantBitsFromNode to discriminate cases with all/partial UNDEF bits in each element - this should also be useful when we get around to supporting getTargetShuffleMaskIndices with UNDEF elements. 

llvm-svn: 295613
parent 4e794c71
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