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| author | Dan Gohman <gohman@apple.com> | 2009-08-29 23:36:57 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-08-29 23:36:57 +0000 |
| commit | ed77e52dd972ada58608f5540d3d0d434899114e (patch) | |
| tree | 9ca3b2194380c5079d2fbd44c4cd29390fbdeeac /lib/Analysis/ScalarEvolutionAliasAnalysis.cpp | |
| parent | f8a87e8343c5f829be9a75d8160e1bb969b84119 (diff) | |
| download | llvm-ed77e52dd972ada58608f5540d3d0d434899114e.tar.gz llvm-ed77e52dd972ada58608f5540d3d0d434899114e.tar.bz2 llvm-ed77e52dd972ada58608f5540d3d0d434899114e.tar.xz | |
Add some comments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80452 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolutionAliasAnalysis.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolutionAliasAnalysis.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Analysis/ScalarEvolutionAliasAnalysis.cpp b/lib/Analysis/ScalarEvolutionAliasAnalysis.cpp index 381ea20486..cc79e6c3b1 100644 --- a/lib/Analysis/ScalarEvolutionAliasAnalysis.cpp +++ b/lib/Analysis/ScalarEvolutionAliasAnalysis.cpp @@ -69,9 +69,14 @@ ScalarEvolutionAliasAnalysis::runOnFunction(Function &F) { return false; } +/// GetUnderlyingIdentifiedObject - Given an expression, try to find an +/// "identified object" (see AliasAnalysis::isIdentifiedObject) base +/// value. Return null is none was found. Value * ScalarEvolutionAliasAnalysis::GetUnderlyingIdentifiedObject(const SCEV *S) { if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) { + // In an addrec, assume that the base will be in the start, rather + // than the step. return GetUnderlyingIdentifiedObject(AR->getStart()); } else if (const SCEVAddExpr *A = dyn_cast<SCEVAddExpr>(S)) { // If there's a pointer operand, it'll be sorted at the end of the list. |