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Author SHA1 Message Date
Duncan Sands 163848021b Look through phi nodes and select instructions when 
calculating nocapture attributes.

llvm-svn: 61535
 2008-12-31 20:21:34 +00:00
Duncan Sands 44c8cd97a5 Rename AddReadAttrs to FunctionAttrs, and teach it how 
to work out (in a very simplistic way) which function
arguments (pointer arguments only) are only dereferenced
and so do not escape.  Mark such arguments 'nocapture'.

llvm-svn: 61525
 2008-12-31 16:14:43 +00:00