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ARM: Don't assume an SDNode is a constant.

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Before accessing a node as a ConstandSDNode, make sure it actually is one.
No testcase of non-trivial size.

rdar://11948669

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160735 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2012-07-25 17:02:47 +00:00
parent eba2bbb58c
commit 242204784b
1 changed files with 4 additions and 0 deletions
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4
lib/Target/ARM/ARMISelLowering.cpp
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@ -4271,6 +4271,10 @@ SDValue ARMTargetLowering::ReconstructShuffle(SDValue Op,
// Record this extraction against the appropriate vector if possible...
SDValue SourceVec = V.getOperand(0);
// If the element number isn't a constant, we can't effectively
// analyze what's going on.
if (!isa<ConstantSDNode>(V.getOperand(1)))
return SDValue();
unsigned EltNo = cast<ConstantSDNode>(V.getOperand(1))->getZExtValue();
bool FoundSource = false;
for (unsigned j = 0; j < SourceVecs.size(); ++j) {