[SDAG] Add SDNode/SDValue getConstantOperandAPInt helper. NFCI.

We already have the getConstantOperandVal helper which returns a uint64_t, but along comes the fuzzer and inserts a i128 -1 constant or something and the whole thing asserts.......

I've updated a few obvious cases, and tried to make use of the const reference where possible, but there's more to do. A number of existing oss-fuzz tickets should be fixed if we start using APInt and perform value clamping where necessary.

llvm-svn: 352961

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index f5339479b54..0d41e51f48d 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -16350,7 +16350,7 @@ SDValue DAGCombiner::reduceBuildVecToShuffle(SDNode *N) {
       return SDValue();
     SDValue ExtractedFromVec = Op.getOperand(0);
 
-    APInt ExtractIdx = cast<ConstantSDNode>(Op.getOperand(1))->getAPIntValue();
+    const APInt &ExtractIdx = Op.getConstantOperandAPInt(1);
     if (ExtractIdx.uge(ExtractedFromVec.getValueType().getVectorNumElements()))
       return SDValue();