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| author | Dan Gohman <gohman@apple.com> | 2009-01-21 20:50:09 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-01-21 20:50:09 +0000 |
| commit | 9ad136c851e0a66eb471573aac9fec47d53a61ba (patch) | |
| tree | 6e697f58bd4aa493c99e91e2526418b56c11f6a0 | |
| parent | 541ed9fd02ea48d2739f4a9dd681ba2d5da26886 (diff) | |
| download | external_llvm-9ad136c851e0a66eb471573aac9fec47d53a61ba.zip external_llvm-9ad136c851e0a66eb471573aac9fec47d53a61ba.tar.gz external_llvm-9ad136c851e0a66eb471573aac9fec47d53a61ba.tar.bz2 | |
Add a comment to SelectionDAG::ReplaceAllUsesWith to describe a subtle
iteraction with SelectionDAG CSE.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62713 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | include/llvm/CodeGen/SelectionDAG.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h index d7802d3..f93b620 100644 --- a/include/llvm/CodeGen/SelectionDAG.h +++ b/include/llvm/CodeGen/SelectionDAG.h @@ -680,6 +680,11 @@ public: /// informed about nodes that are deleted and modified due to recursive /// changes in the dag. /// + /// These functions only replace all existing uses. It's possible that as + /// these replacements are being performed, CSE may cause the From node + /// to be given new uses. These new uses of From are left in place, and + /// not automatically transfered to To. + /// void ReplaceAllUsesWith(SDValue From, SDValue Op, DAGUpdateListener *UpdateListener = 0); void ReplaceAllUsesWith(SDNode *From, SDNode *To, |