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* Revert part of r166049 back and enable test case in r166125.Michael Liao2012-10-171-1/+0
| | | | | | | | - Folding (trunc (concat ... X )) to (concat ... (trunc X) ...) is valid when '...' are all 'undef's. - r166125 relies on this transformation. llvm-svn: 166155
* Disable extract-concat test case temporarilyMichael Liao2012-10-171-1/+2
| | | | llvm-svn: 166141
* Teach DAG combine to fold (extract_subvec (concat v1, ..) i) to v_iMichael Liao2012-10-171-0/+17
- If the extracted vector has the same type of all vectored being concatenated together, it should be simplified directly into v_i, where i is the index of the element being extracted. llvm-svn: 166125
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