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SCEV objects are no longer reference-counted.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77080 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-07-25 16:18:07 +00:00
parent 72efa18f1d
commit bc3d77a0df
1 changed files with 2 additions and 3 deletions
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5
lib/Analysis/ScalarEvolution.cpp
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@ -14,9 +14,8 @@
// There are several aspects to this library. First is the representation of // There are several aspects to this library. First is the representation of
// scalar expressions, which are represented as subclasses of the SCEV class. // scalar expressions, which are represented as subclasses of the SCEV class.
// These classes are used to represent certain types of subexpressions that we // These classes are used to represent certain types of subexpressions that we
// can handle. These classes are reference counted, managed by the const SCEV * // can handle. We only create one SCEV of a particular shape, so
// class. We only create one SCEV of a particular shape, so pointer-comparisons // pointer-comparisons for equality are legal.
// for equality are legal.
// //
// One important aspect of the SCEV objects is that they are never cyclic, even // 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 // if there is a cycle in the dataflow for an expression (ie, a PHI node). If