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-rw-r--r--llvm/lib/VMCore/Metadata.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/VMCore/Metadata.cpp b/llvm/lib/VMCore/Metadata.cpp
index 8a40fed1cca..7d783958882 100644
--- a/llvm/lib/VMCore/Metadata.cpp
+++ b/llvm/lib/VMCore/Metadata.cpp
@@ -154,7 +154,8 @@ static Function *assertLocalFunction(const MDNode *N) {
// getFunction - If this metadata is function-local and recursively has a
// function-local operand, return the first such operand's parent function.
-// Otherwise, return null.
+// Otherwise, return null. getFunction() should not be used for performance-
+// critical code because it recursively visits all the MDNode's operands.
Function *MDNode::getFunction() const {
#ifndef NDEBUG
return assertLocalFunction(this);
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