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3 Commits

Author SHA1 Message Date
Jiangning Liu
61519cd699 Optimize sext/zext insertion algorithm in back-end. 
With this optimization, we will not always insert zext for values crossing
basic blocks, but insert sext if the users of a value crossing basic block
has preference of sign predicate.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218101 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-09-19 05:30:35 +00:00
Jiangning Liu
150cef218f Revert r216066, "Optimize ZERO_EXTEND and SIGN_EXTEND in both SelectionDAG Builder and type". 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216147 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-08-21 01:59:30 +00:00
Jiangning Liu
e04455d72b Optimize ZERO_EXTEND and SIGN_EXTEND in both SelectionDAG Builder and type 
legalization stage. With those two optimizations, fewer signed/zero extension
instructions can be inserted, and then we can expose more opportunities to
Machine CSE pass in back-end.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216066 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-08-20 12:05:15 +00:00