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fix the X86 backend to just drop llvm.declare nodes for VLAs instead of

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leaving them in the DAG and then getting selection errors.  This is a 
fix for PR3538.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64382 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-02-12 17:33:11 +00:00
parent 4ed76e76bb
commit 1823c92aa7
2 changed files with 94 additions and 7 deletions
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25
lib/Target/X86/X86ISelDAGToDAG.cpp
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@@ -1563,17 +1563,29 @@ SDNode *X86DAGToDAGISel::Select(SDValue N) {
SDValue N1 = Node->getOperand(1);
SDValue N2 = Node->getOperand(2);
FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(N1);
if (!FINode)
break;
// FIXME: We need to handle this for VLAs.
if (!FINode) {
ReplaceUses(N.getValue(0), Chain);
return NULL;
}
if (N2.getOpcode() == ISD::ADD &&
N2.getOperand(0).getOpcode() == X86ISD::GlobalBaseReg)
N2 = N2.getOperand(1);
if (N2.getOpcode() != X86ISD::Wrapper)
break;
// If N2 is not Wrapper(decriptor) then the llvm.declare is mangled
// somehow, just ignore it.
if (N2.getOpcode() != X86ISD::Wrapper) {
ReplaceUses(N.getValue(0), Chain);
return NULL;
}
GlobalAddressSDNode *GVNode =
dyn_cast<GlobalAddressSDNode>(N2.getOperand(0));
if (!GVNode)
break;
if (GVNode == 0) {
ReplaceUses(N.getValue(0), Chain);
return NULL;
}
SDValue Tmp1 = CurDAG->getTargetFrameIndex(FINode->getIndex(),
TLI.getPointerTy());
SDValue Tmp2 = CurDAG->getTargetGlobalAddress(GVNode->getGlobal(),
@@ -1581,7 +1593,6 @@ SDNode *X86DAGToDAGISel::Select(SDValue N) {
SDValue Ops[] = { Tmp1, Tmp2, Chain };
return CurDAG->getTargetNode(TargetInstrInfo::DECLARE, dl,
MVT::Other, Ops, 3);
break;
}
}