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Until we have a dag combiner, promote using zextload's instead of extloads.

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This gives the optimizer a bit of information about the top-part of the
value.

llvm-svn: 21205
This commit is contained in:
Chris Lattner 2005-04-10 04:33:47 +00:00
parent 9d13d0b958
commit 0c089eae41
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -1355,7 +1355,8 @@ SDOperand SelectionDAGLegalize::PromoteOp(SDOperand Op) {
case ISD::LOAD:
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the pointer.
Result = DAG.getNode(ISD::EXTLOAD, NVT, Tmp1, Tmp2, VT);
// FIXME: When the DAG combiner exists, change this to use EXTLOAD!
Result = DAG.getNode(ISD::ZEXTLOAD, NVT, Tmp1, Tmp2, VT);
// Remember that we legalized the chain.
AddLegalizedOperand(Op.getValue(1), Result.getValue(1));