WebAssembly: basic bitcode → assembly CodeGen test

[oota-llvm.git] / lib / Target / WebAssembly / WebAssemblyISelDAGToDAG.cpp

diff --git a/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp b/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
index 518ef332a6c754dc8ec438734ec73ea382e8af36..58a23756bdc1a197ad4c6098d961dab362ca0bf2 100644 (file)
--- a/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
+++ b/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
@@ -56,13 +56,49 @@ public:
 
   SDNode *Select(SDNode *Node) override;
 
+// Include the pieces autogenerated from the target description.
+#include "WebAssemblyGenDAGISel.inc"
+
 private:
   // add select functions here...
 };
 } // end anonymous namespace
 
 SDNode *WebAssemblyDAGToDAGISel::Select(SDNode *Node) {
-  llvm_unreachable("TODO: implement Select");
+  // Dump information about the Node being selected.
+  DEBUG(errs() << "Selecting: ");
+  DEBUG(Node->dump(CurDAG));
+  DEBUG(errs() << "\n");
+
+  // If we have a custom node, we already have selected!
+  if (Node->isMachineOpcode()) {
+    DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
+    Node->setNodeId(-1);
+    return nullptr;
+  }
+
+  // Few custom selection stuff.
+  SDNode *ResNode = nullptr;
+  EVT VT = Node->getValueType(0);
+
+  switch (Node->getOpcode()) {
+  default:
+    break;
+    // FIXME: Implement WebAssembly-specific selection.
+    (void)VT;
+  }
+
+  // Select the default instruction.
+  ResNode = SelectCode(Node);
+
+  DEBUG(errs() << "=> ");
+  if (ResNode == nullptr || ResNode == Node)
+    DEBUG(Node->dump(CurDAG));
+  else
+    DEBUG(ResNode->dump(CurDAG));
+  DEBUG(errs() << "\n");
+
+  return ResNode;
 }
 
 /// This pass converts a legalized DAG into a WebAssembly-specific DAG, ready