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Fix a bug where DAGCombine was producing an illegal ConstantFP

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node after legalize, and remove the workaround code from the
ARM backend.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78615 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-08-10 23:15:10 +00:00
parent c5cfea3c02
commit a407ca16c2
2 changed files with 12 additions and 19 deletions
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13
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@@ -3721,7 +3721,18 @@ SDValue DAGCombiner::visitBIT_CONVERT(SDNode *N) {
// If the input is a constant, let getNode fold it.
if (isa<ConstantSDNode>(N0) || isa<ConstantFPSDNode>(N0)) {
SDValue Res = DAG.getNode(ISD::BIT_CONVERT, N->getDebugLoc(), VT, N0);
if (Res.getNode() != N) return Res;
if (Res.getNode() != N) {
if (!LegalOperations ||
TLI.isOperationLegal(Res.getNode()->getOpcode(), VT))
return Res;
// Folding it resulted in an illegal node, and it's too late to
// do that. Clean up the old node and forego the transformation.
// Ideally this won't happen very often, because instcombine
// and the earlier dagcombine runs (where illegal nodes are
// permitted) should have folded most of them already.
DAG.DeleteNode(Res.getNode());
}
}
// (conv (conv x, t1), t2) -> (conv x, t2)