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Add more comments describing SDNode operator codes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63239 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-01-28 21:34:36 +00:00
parent 3edb43e620
commit 4f80178a10
1 changed files with 12 additions and 8 deletions
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20
include/llvm/CodeGen/SelectionDAGNodes.h
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@ -60,15 +60,19 @@ struct SDVTList {
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