[wasm] Implement I32x4ReplaceLane, I32x4Add, I32x4Sub.

src/wasm/ast-decoder.cc

 // Copyright 2015 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/signature.h"
 
 #include "src/bit-vector.h"
 #include "src/flags.h"
 #include "src/handles.h"
 #include "src/zone/zone-containers.h"
@@ skipping 1313 matching lines @@
     Value val = Pop(1, type);
     Value index = Pop(0, kAstI32);
     BUILD(StoreMem, mem_type, index.node, operand.offset, operand.alignment,
           val.node, position());
     return 1 + operand.length;
   }
 
   unsigned ExtractLane(WasmOpcode opcode, LocalType type) {
     LaneOperand operand(this, pc_);
     if (Validate(pc_, operand)) {
-      TFNode* input = Pop(0, LocalType::kSimd128).node;
-      TFNode* node = BUILD(SimdExtractLane, opcode, operand.lane, input);
+      compiler::NodeVector inputs(2, zone_);
+      inputs[1] = builder_->Int32Constant(operand.lane);
+      inputs[0] = Pop(0, LocalType::kSimd128).node;
+      TFNode* node = BUILD(SimdOp, opcode, inputs);
       Push(type, node);
     }
     return operand.length;
   }
 
+  unsigned ReplaceLane(WasmOpcode opcode, LocalType type) {
+    LaneOperand operand(this, pc_);
+    if (Validate(pc_, operand)) {
+      compiler::NodeVector inputs(3, zone_);
+      inputs[2] = Pop(1, type).node;
+      inputs[1] = builder_->Int32Constant(operand.lane);
+      inputs[0] = Pop(0, LocalType::kSimd128).node;
+      TFNode* node = BUILD(SimdOp, opcode, inputs);
+      Push(LocalType::kSimd128, node);
+    }
+    return operand.length;
+  }
+
   unsigned DecodeSimdOpcode(WasmOpcode opcode) {
     unsigned len = 0;
     switch (opcode) {
+      case kExprI32x4ReplaceLane: {
+        len = ReplaceLane(opcode, LocalType::kWord32);
+        break;
+      }
       case kExprI32x4ExtractLane: {
         len = ExtractLane(opcode, LocalType::kWord32);
         break;
       }
       case kExprF32x4ExtractLane: {
         len = ExtractLane(opcode, LocalType::kFloat32);
         break;
       }
       default: {
         FunctionSig* sig = WasmOpcodes::Signature(opcode);
@@ skipping 684 matching lines @@
 BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals,
                                            const byte* start, const byte* end) {
   FunctionBody body = {nullptr, nullptr, nullptr, start, end};
   WasmFullDecoder decoder(zone, nullptr, body);
   return decoder.AnalyzeLoopAssignmentForTesting(start, num_locals);
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8