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Document an implementation detail about EXTRACT_SUBREG and INSERT_SUBREG sub-register operand.

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llvm-svn: 48283
This commit is contained in:
Evan Cheng 2008-03-12 07:52:15 +00:00
parent 6ff0b822b4
commit 136a24742c
1 changed files with 3 additions and 0 deletions
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llvm/include/llvm/CodeGen/SelectionDAGNodes.h
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@ -320,6 +320,9 @@ namespace ISD {
// EXTRACT_SUBREG - This node is used to extract a sub-register value.
// This node takes a superreg and a constant sub-register index as operands.
// Note sub-register indices must be increasing. That is, if the
// sub-register index of a 8-bit sub-register is N, then the index for a
// 16-bit sub-register must be at least N+1.
EXTRACT_SUBREG,
// INSERT_SUBREG - This node is used to insert a sub-register value.