[wasm] implement simd lowering for replaceLane, load, store and test for phi

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 1320 matching lines @@
   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);
       Push(type, node);
     }
     return operand.length;
   }
 
+  unsigned ReplaceLane(WasmOpcode opcode, LocalType type) {
+    LaneOperand operand(this, pc_);
+    if (Validate(pc_, operand)) {
+      TFNode* input = Pop(0, LocalType::kSimd128).node;
+      TFNode* replacement = Pop(1, type).node;
+      TFNode* node =
+          BUILD(SimdReplaceLane, opcode, operand.lane, input, replacement);
+      Push(LocalType::kSimd128, node);
+    }
+    return operand.length;
+  }
+
   unsigned DecodeSimdOpcode(WasmOpcode opcode) {
     unsigned len = 0;
     switch (opcode) {
       case kExprI32x4ExtractLane: {
         len = ExtractLane(opcode, LocalType::kWord32);
         break;
       }
       case kExprF32x4ExtractLane: {
         len = ExtractLane(opcode, LocalType::kFloat32);
         break;
       }
+      case kExprI32x4ReplaceLane: {
+        len = ReplaceLane(opcode, LocalType::kWord32);
+        break;
+      }
+      case kExprF32x4ReplaceLane: {
+        len = ReplaceLane(opcode, LocalType::kFloat32);
+        break;
+      }
       default: {
         FunctionSig* sig = WasmOpcodes::Signature(opcode);
         if (sig != nullptr) {
           compiler::NodeVector inputs(sig->parameter_count(), zone_);
           for (size_t i = sig->parameter_count(); i > 0; i--) {
             Value val = Pop(static_cast<int>(i - 1), sig->GetParam(i - 1));
             inputs[i - 1] = val.node;
           }
           TFNode* node = BUILD(SimdOp, opcode, inputs);
           Push(GetReturnType(sig), node);
@@ skipping 676 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