namespace ISD {
//===--------------------------------------------------------------------===//
- /// ISD::NodeType enum - This enum defines all of the operators valid in a
- /// SelectionDAG.
+ /// ISD::NodeType enum - This enum defines the target-independent operators
+ /// for a SelectionDAG.
///
- /// These are sometimes called the target-independent operators; targets
- /// may also define target-dependent operators. For example, on x86, these
- /// are the enum values in the X86ISD namespace. Targets should aim to use
- /// target-independent operators to model their instruction sets as much
- /// as possible, and only use target-dependent operators when they have
- /// special requirements.
+ /// Targets may also define target-dependent operator codes for SDNodes. For
+ /// example, on x86, these are the enum values in the X86ISD namespace.
+ /// Targets should aim to use target-independent operators to model their
+ /// instruction sets as much as possible, and only use target-dependent
+ /// operators when they have special requirements.
+ ///
+ /// Finally, during and after selection proper, SNodes may use special
+ /// operator codes that correspond directly with MachineInstr opcodes. These
+ /// are used to represent selected instructions. See the isMachineOpcode()
+ /// and getMachineOpcode() member functions of SDNode.
///
enum NodeType {
// DELETED_NODE - This is an illegal flag value that is used to catch