Convert SIMD wasm ops to runtime function calls

src/compiler/simd-lowering.cc

+// 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.
+
+#include "src/compiler/simd-lowering.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+SimdLowering::~SimdLowering() {}
+
+void SimdLowering::InitializeSignatures() {
+  // Initialize signatures for runtime calls
+  const int kReturnCount = 1;
+  const int kBinop = 2;
+  const int kSimd32x4 = 4;
+  const int kSimd16x8 = 8;
+  const int kSimd8x16 = 16;
+
+  ConversionSignature::Builder CreateInt32x4Builder(zone_, kReturnCount,
+                                                    kSimd32x4);
+  ConversionSignature::Builder CreateFloat32x4Builder(zone_, kReturnCount,
+                                                      kSimd32x4);
+  ConversionSignature::Builder CreateInt16x8Builder(zone_, kReturnCount,
+                                                    kSimd16x8);
+  ConversionSignature::Builder CreateInt8x16Builder(zone_, kReturnCount,
+                                                    kSimd8x16);
+  ConversionSignature::Builder ExtractLaneIntBuilder(zone_, kReturnCount,
+                                                     kBinop);
+  ConversionSignature::Builder ExtractLaneFloatBuilder(zone_, kReturnCount,
+                                                       kBinop);
+  ConversionSignature::Builder DefaultBuilder(zone_, kReturnCount, kSimd8x16);
+
+  // Initialize Signatures for create functions
+  for (int i = 0; i < kSimd32x4; i++) {
+    CreateInt32x4Builder.AddParam(Conversion::kInt32);
+    CreateFloat32x4Builder.AddParam(Conversion::kFloat32);
+  }
+  CreateInt32x4Builder.AddReturn(Conversion::kOpaque);
+  SigCreateInt32x4 = CreateInt32x4Builder.Build();
+
+  CreateFloat32x4Builder.AddReturn(Conversion::kOpaque);
+  SigCreateFloat32x4 = CreateFloat32x4Builder.Build();
+
+  for (int i = 0; i < kSimd16x8; i++) {
+    CreateInt16x8Builder.AddParam(Conversion::kInt32);
+  }
+  CreateInt16x8Builder.AddReturn(Conversion::kOpaque);
+  SigCreateInt16x8 = CreateInt16x8Builder.Build();
+
+  for (int i = 0; i < kSimd8x16; i++) {
+    CreateInt8x16Builder.AddParam(Conversion::kInt32);
+  }
+  CreateInt8x16Builder.AddReturn(Conversion::kOpaque);
+  SigCreateInt8x16 = CreateInt8x16Builder.Build();
+
+  // Initialize signatures for ExtractLane functions
+  ExtractLaneIntBuilder.AddParam(Conversion::kOpaque);
+  ExtractLaneIntBuilder.AddParam(Conversion::kInt32);
+  ExtractLaneIntBuilder.AddReturn(Conversion::kInt32);
+  SigExtractLaneInt = ExtractLaneIntBuilder.Build();
+}
+
+Reduction SimdLowering::Reduce(Node* node) {
+  // For now lower everything to runtime calls.
+  switch (node->opcode()) {
+    case IrOpcode::kCreateInt32x4: {
+      return Replace(builder_->ChangeToRuntimeCall(
+          node, Runtime::kCreateInt32x4, SigCreateInt32x4));
+    }
+    case IrOpcode::kCreateInt16x8: {
+      return Replace(builder_->ChangeToRuntimeCall(
+          node, Runtime::kCreateInt16x8, SigCreateInt16x8));
+    }
+    case IrOpcode::kCreateInt8x16: {
+      return Replace(builder_->ChangeToRuntimeCall(
+          node, Runtime::kCreateInt8x16, SigCreateInt8x16));
+    }
+    case IrOpcode::kCreateFloat32x4: {
+      return Replace(builder_->ChangeToRuntimeCall(
+          node, Runtime::kCreateFloat32x4, SigCreateFloat32x4));
+    }
+    case IrOpcode::kInt8x16ExtractLane:
+    case IrOpcode::kInt16x8ExtractLane:
+    case IrOpcode::kInt32x4ExtractLane: {
+      return Replace(builder_->ChangeToRuntimeCall(
+          node, Runtime::kInt32x4ExtractLane, SigExtractLaneInt));
+    }
+    case IrOpcode::kFloat32x4ExtractLane: {
+      return Replace(builder_->ChangeToRuntimeCall(
+          node, Runtime::kFloat32x4ExtractLane, SigExtractLaneFloat));
+    }
+    default: { break; }
+  }
+
+  // TODO(gdeepti): Implement and test.
+  // Assume the others are all just simd in and out.
+  switch (node->opcode()) {
+#define F(Opcode)                                                             \
+  case IrOpcode::k##Opcode: {                                                 \
+    return Replace(                                                           \
+        builder_->ChangeToRuntimeCall(node, Runtime::k##Opcode, SigDefault)); \
+  }
+    MACHINE_SIMD_RETURN_SIMD_OP_LIST(F)
+    MACHINE_SIMD_RETURN_BOOL_OP_LIST(F)
+#undef F
+    default: { return NoChange(); }
+  }
+  UNREACHABLE();
+  return NoChange();
+}
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8