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Add some comments on ISD::NodeType.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63234 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -63,6 +63,13 @@ namespace ISD {
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/// ISD::NodeType enum - This enum defines all of the operators valid in a
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/// SelectionDAG.
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///
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/// These are sometimes called the target-independent operators; targets
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/// may also define target-dependent operators. For example, on x86, these
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/// are the enum values in the X86ISD namespace. Targets should aim to use
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/// target-independent operators to model their instruction sets as much
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/// as possible, and only use target-dependent operators when they have
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/// special requirements.
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///
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enum NodeType {
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// DELETED_NODE - This is an illegal flag value that is used to catch
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// errors. This opcode is not a legal opcode for any node.
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