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Add ISD::UNDEF node

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Teach the SelectionDAG code how to expand and promote it
Have PPC32 LowerCallTo generate ISD::UNDEF for int arg regs used up by fp
  arguments, but not shadowing their value.  This allows us to do the right
  thing with both fixed and vararg floating point arguments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20988 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2005-04-01 22:34:39 +00:00
parent e6fea166c3
commit fc1b1dad88
4 changed files with 95 additions and 41 deletions
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3
include/llvm/CodeGen/SelectionDAGNodes.h
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@@ -74,6 +74,9 @@ namespace ISD {
// out.
ImplicitDef,
// UNDEF - An undefined node
UNDEF,
// EXTRACT_ELEMENT - This is used to get the first or second (determined by
// a Constant, which is required to be operand #1), element of the aggregate
// value specified as operand #0. This is only for use before legalization,