Build correct vector filled with undef nodes
llvm-svn: 217570
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index b21181c..156d0a3 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -2664,9 +2664,17 @@
// fold (and x, 0) -> 0, vector edition
if (ISD::isBuildVectorAllZeros(N0.getNode()))
- return N0;
+ // do not return N0, because undef node may exist in N0
+ return DAG.getConstant(
+ APInt::getNullValue(
+ N0.getValueType().getScalarType().getSizeInBits()),
+ N0.getValueType());
if (ISD::isBuildVectorAllZeros(N1.getNode()))
- return N1;
+ // do not return N1, because undef node may exist in N1
+ return DAG.getConstant(
+ APInt::getNullValue(
+ N1.getValueType().getScalarType().getSizeInBits()),
+ N1.getValueType());
// fold (and x, -1) -> x, vector edition
if (ISD::isBuildVectorAllOnes(N0.getNode()))
@@ -3312,9 +3320,17 @@
// fold (or x, -1) -> -1, vector edition
if (ISD::isBuildVectorAllOnes(N0.getNode()))
- return N0;
+ // do not return N0, because undef node may exist in N0
+ return DAG.getConstant(
+ APInt::getAllOnesValue(
+ N0.getValueType().getScalarType().getSizeInBits()),
+ N0.getValueType());
if (ISD::isBuildVectorAllOnes(N1.getNode()))
- return N1;
+ // do not return N1, because undef node may exist in N1
+ return DAG.getConstant(
+ APInt::getAllOnesValue(
+ N1.getValueType().getScalarType().getSizeInBits()),
+ N1.getValueType());
// fold (or (shuf A, V_0, MA), (shuf B, V_0, MB)) -> (shuf A, B, Mask1)
// fold (or (shuf A, V_0, MA), (shuf B, V_0, MB)) -> (shuf B, A, Mask2)