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3 Commits

Author SHA1 Message Date
Michael Liao
07edaf3801 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166155 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-17 23:45:54 +00:00
Michael Liao
6e0c2b36d6 Disable extract-concat test case temporarily 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166141 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-17 23:08:19 +00:00
Michael Liao
13429e224c 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166125 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-17 20:48:33 +00:00