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Author SHA1 Message Date
Michael Liao 3ac8201ea4 Revert part of r166049 back and enable test case in r166125. 
- Folding (trunc (concat ... X )) to (concat ... (trunc X) ...) is valid
  when '...' are all 'undef's.
- r166125 relies on this transformation.

llvm-svn: 166155
 2012-10-17 23:45:54 +00:00
Michael Liao f630f4cadc Disable extract-concat test case temporarily 
llvm-svn: 166141
 2012-10-17 23:08:19 +00:00
Michael Liao 7a442c8031 Teach DAG combine to fold (extract_subvec (concat v1, ..) i) to v_i 
- 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
 2012-10-17 20:48:33 +00:00