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SCEV objects are no longer reference-counted. 

llvm-svn: 77080
This commit is contained in:
Dan Gohman 2009-07-25 16:18:07 +00:00
parent 83b3b3d144
commit ef2ae2c8ee
1 changed files with 2 additions and 3 deletions
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5
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -14,9 +14,8 @@
// There are several aspects to this library. First is the representation of
// scalar expressions, which are represented as subclasses of the SCEV class.
// These classes are used to represent certain types of subexpressions that we
// can handle. These classes are reference counted, managed by the const SCEV *
// class. We only create one SCEV of a particular shape, so pointer-comparisons
// for equality are legal.
// can handle. We only create one SCEV of a particular shape, so
// pointer-comparisons for equality are legal.
//
// One important aspect of the SCEV objects is that they are never cyclic, even
// if there is a cycle in the dataflow for an expression (ie, a PHI node). If