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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 | 922bf52e8e5865b8537bd50702d63eb9ae6022d1 (patch) | |
| tree | 94e6597d5d2433d026aa025a4d2784894e784a0e | |
| parent | 1f86498f9356864881356f4c6815d31e1bdeddb7 (diff) | |
| download | bcm5719-llvm-922bf52e8e5865b8537bd50702d63eb9ae6022d1.tar.gz bcm5719-llvm-922bf52e8e5865b8537bd50702d63eb9ae6022d1.zip | |
Add a comment to SelectionDAG::ReplaceAllUsesWith to describe a subtle
iteraction with SelectionDAG CSE.
llvm-svn: 62713
| -rw-r--r-- | llvm/include/llvm/CodeGen/SelectionDAG.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/include/llvm/CodeGen/SelectionDAG.h b/llvm/include/llvm/CodeGen/SelectionDAG.h index d7802d3cde6..f93b6207b8f 100644 --- a/llvm/include/llvm/CodeGen/SelectionDAG.h +++ b/llvm/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, |
