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Initial support for nested CALLSEQ_START/CALLSEQ_END constructs in LegalizeDAG.

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Necessary for byval support on ARM.  Radar 7662569.

llvm-svn: 121412
This commit is contained in:
Stuart Hastings 2010-12-09 21:25:20 +00:00
parent fe4b9ee934
commit f7bba0cfe3
1 changed files with 24 additions and 8 deletions
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32
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -252,8 +252,10 @@ void SelectionDAGLegalize::LegalizeDAG() {
/// FindCallEndFromCallStart - Given a chained node that is part of a call
/// sequence, find the CALLSEQ_END node that terminates the call sequence.
static SDNode *FindCallEndFromCallStart(SDNode *Node) {
if (Node->getOpcode() == ISD::CALLSEQ_END)
static SDNode *FindCallEndFromCallStart(SDNode *Node, int depth = 0) {
if (Node->getOpcode() == ISD::CALLSEQ_START)
depth++;
if ((Node->getOpcode() == ISD::CALLSEQ_END) && (depth == 1))
return Node;
if (Node->use_empty())
return 0; // No CallSeqEnd
@ -284,7 +286,7 @@ static SDNode *FindCallEndFromCallStart(SDNode *Node) {
SDNode *User = *UI;
for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i)
if (User->getOperand(i) == TheChain)
if (SDNode *Result = FindCallEndFromCallStart(User))
if (SDNode *Result = FindCallEndFromCallStart(User, depth))
return Result;
}
return 0;
@ -293,12 +295,26 @@ static SDNode *FindCallEndFromCallStart(SDNode *Node) {
/// FindCallStartFromCallEnd - Given a chained node that is part of a call
/// sequence, find the CALLSEQ_START node that initiates the call sequence.
static SDNode *FindCallStartFromCallEnd(SDNode *Node) {
int nested = 0;
assert(Node && "Didn't find callseq_start for a call??");
if (Node->getOpcode() == ISD::CALLSEQ_START) return Node;
assert(Node->getOperand(0).getValueType() == MVT::Other &&
"Node doesn't have a token chain argument!");
return FindCallStartFromCallEnd(Node->getOperand(0).getNode());
while (Node->getOpcode() != ISD::CALLSEQ_START || nested) {
Node = Node->getOperand(0).getNode();
assert(Node->getOperand(0).getValueType() == MVT::Other &&
"Node doesn't have a token chain argument!");
switch (Node->getOpcode()) {
default:
break;
case ISD::CALLSEQ_START:
if (!nested)
return Node;
nested--;
break;
case ISD::CALLSEQ_END:
nested++;
break;
}
}
return 0;
}
/// LegalizeAllNodesNotLeadingTo - Recursively walk the uses of N, looking to