Convert SIMD wasm ops to runtime function calls

src/compiler/simd-lowering.h

Index: src/compiler/simd-lowering.h
diff --git a/src/compiler/simd-lowering.h b/src/compiler/simd-lowering.h
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+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_COMPILER_SIMD_LOWERING_H_
+#define V8_COMPILER_SIMD_LOWERING_H_
+
+#include "src/compiler/graph-reducer.h"
+#include "src/compiler/wasm-compiler.h"
+#include "src/runtime/runtime.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+// Forward declarations.
+class JSGraph;
+class MachineOperatorBuilder;
+
+class SimdLowering final : public Reducer {
+ public:
+  SimdLowering(JSGraph* jsgraph, WasmGraphBuilder* builder,
+               Handle<Context> context)
+      : jsgraph_(jsgraph), builder_(builder), context_(context) {}
+  virtual ~SimdLowering();
+
+  Reduction Reduce(Node* node) override;
+
+ private:
+  enum Conversion { kNone, kOpaque, kInt32, kFloat32, kFloat64 };
+  Reduction ChangeToRuntimeCall(Node* node, Runtime::FunctionId f,
+                                Conversion* signature);
+
+  JSGraph* jsgraph() const { return jsgraph_; }
+
+  JSGraph* const jsgraph_;
+  WasmGraphBuilder* builder_;
+  Handle<Context> context_;
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_SIMD_LOWERING_H_