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3 Commits

Author SHA1 Message Date
Andrew Trick
033efdf4d7 Fixes PR8823: add-with-overflow-128.ll 
In the bottom-up selection DAG scheduling, handle two-address
instructions that read/write unspillable registers. Treat
the entire chain of two-address nodes as a single live range.

llvm-svn: 122472
 2010-12-23 03:15:51 +00:00
Chris Lattner
17a06b7efa temporarily disable this: PR8823. 
llvm-svn: 122222
 2010-12-20 02:11:23 +00:00
Eli Friedman
dbbbf73c96 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