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Add comment that MDNode::getFunction() is not to be used by performance-critical code (currently only used by AsmWriter)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Victor Hernandez 2010-01-18 22:55:08 +00:00
parent 74733a7e46
commit 6cead7879a
2 changed files with 4 additions and 2 deletions
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3
include/llvm/Metadata.h
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@ -154,7 +154,8 @@ public:
// 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 *getFunction() const;
// destroy - Delete this node. Only when there are no uses.

3
lib/VMCore/Metadata.cpp
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@ -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);