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Author SHA1 Message Date
Eli Friedman
60c8122bb0 Implement expansion in type legalization for add/sub with overflow. The 
expansion is the same as that used by LegalizeDAG.

The resulting code sucks in terms of performance/codesize on x86-32 for a
64-bit operation; I haven't looked into whether different expansions might be
better in general.

llvm-svn: 105378
 2010-06-03 03:49:50 +00:00