[AVX] Add INSERT_SUBVECTOR and support it on x86. This provides a
default implementation for x86, going through the stack in a similr
fashion to how the codegen implements BUILD_VECTOR. Eventually this
will get matched to VINSERTF128 if AVX is available.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124307 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 68d7621..661f810 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3082,6 +3082,30 @@
case ISD::VECTOR_SHUFFLE:
llvm_unreachable("should use getVectorShuffle constructor!");
break;
+ case ISD::INSERT_SUBVECTOR: {
+ SDValue Index = N3;
+ if (VT.isSimple() && N1.getValueType().isSimple()
+ && N2.getValueType().isSimple()) {
+ assert(VT.isVector() && N1.getValueType().isVector() &&
+ N2.getValueType().isVector() &&
+ "Insert subvector VTs must be a vectors");
+ assert(VT == N1.getValueType() &&
+ "Dest and insert subvector source types must match!");
+ assert(N2.getValueType().getSimpleVT() <= N1.getValueType().getSimpleVT() &&
+ "Insert subvector must be from smaller vector to larger vector!");
+ if (ConstantSDNode *CSD = dyn_cast<ConstantSDNode>(Index.getNode())) {
+ uint64_t Idx = CSD->getZExtValue();
+ assert((N2.getValueType().getVectorNumElements() + Idx
+ <= VT.getVectorNumElements())
+ && "Insert subvector overflow!");
+ }
+
+ // Trivial insertion.
+ if (VT.getSimpleVT() == N2.getValueType().getSimpleVT())
+ return N2;
+ }
+ break;
+ }
case ISD::BITCAST:
// Fold bit_convert nodes from a type to themselves.
if (N1.getValueType() == VT)
@@ -5811,6 +5835,7 @@
case ISD::INSERT_VECTOR_ELT: return "insert_vector_elt";
case ISD::EXTRACT_VECTOR_ELT: return "extract_vector_elt";
case ISD::CONCAT_VECTORS: return "concat_vectors";
+ case ISD::INSERT_SUBVECTOR: return "insert_subvector";
case ISD::EXTRACT_SUBVECTOR: return "extract_subvector";
case ISD::SCALAR_TO_VECTOR: return "scalar_to_vector";
case ISD::VECTOR_SHUFFLE: return "vector_shuffle";