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Author SHA1 Message Date
Jiangning Liu ffbc690933 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.

llvm-svn: 218101
 2014-09-19 05:30:35 +00:00
Jiangning Liu deb4b5fc37 Revert r216066, "Optimize ZERO_EXTEND and SIGN_EXTEND in both SelectionDAG Builder and type". 
llvm-svn: 216147
 2014-08-21 01:59:30 +00:00
Jiangning Liu f841b3b79e 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.

llvm-svn: 216066
 2014-08-20 12:05:15 +00:00