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Author SHA1 Message Date
Benjamin Kramer 8665f8d916 Revert a part of r126557 which could create unschedulable DAGs. 
llvm-svn: 134067
 2011-06-29 13:47:25 +00:00
Benjamin Kramer 26691d9660 Add some DAGCombines for (adde 0, 0, glue), which are useful to optimize legalized code for large integer arithmetic. 
1. Inform users of ADDEs with two 0 operands that it never sets carry
2. Fold other ADDs or ADDCs into the ADDE if possible

It would be neat if we could do the same thing for SETCC+ADD eventually, but we can't do that in target independent code.

llvm-svn: 126557
 2011-02-26 22:48:07 +00:00