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Two simplifications for token factor nodes: simplify tf(x,x) -> x. 

simplify tf(x,y,y,z) -> tf(x,y,z).

llvm-svn: 28233
This commit is contained in:
Chris Lattner 2006-05-12 05:01:37 +00:00
parent 1501b9f829
commit 66adee93aa
1 changed files with 6 additions and 2 deletions
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8
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -680,7 +680,8 @@ SDOperand DAGCombiner::visitTokenFactor(SDNode *N) {
// If the token factor has two operands and one is the entry token, replace
// the token factor with the other operand.
if (N->getNumOperands() == 2) {
if (N->getOperand(0).getOpcode() == ISD::EntryToken)
if (N->getOperand(0).getOpcode() == ISD::EntryToken ||
N->getOperand(0) == N->getOperand(1))
return N->getOperand(1);
if (N->getOperand(1).getOpcode() == ISD::EntryToken)
return N->getOperand(0);
@ -694,8 +695,11 @@ SDOperand DAGCombiner::visitTokenFactor(SDNode *N) {
Changed = true;
for (unsigned j = 0, e = Op.getNumOperands(); j != e; ++j)
Ops.push_back(Op.getOperand(j));
} else {
} else if (i == 0 || N->getOperand(i) != N->getOperand(i-1)) {
Ops.push_back(Op);
} else {
// Deleted an operand that was the same as the last one.
Changed = true;
}
}
if (Changed)