[Turbofan] SIMD tests for Int32x4Add, Sub, ReplaceLane.

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 1272 matching lines @@
   int DecodeStoreMem(LocalType type, MachineType mem_type) {
     MemoryAccessOperand operand(this, pc_,
                                 ElementSizeLog2Of(mem_type.representation()));
     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;
   }
 
+  uint8_t LaneValue(uint8_t max_lanes) {
+    uint8_t lane = this->checked_read_u8(pc_, 2, "lane number");
+    if (lane < 0 || lane > (max_lanes - 1)) {
+      error(pc_, pc_ + 2, "invalid Simd128 lane value");
+    }
+    return lane;
+  }
+
   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 DecodeSimdOpcode(WasmOpcode opcode) {
     unsigned len = 0;
+    static const int kInt32x4MaxLanes = 4;
     switch (opcode) {
+      case kExprI32x4ReplaceLane: {
+        compiler::NodeVector inputs(3, zone_);
+        inputs[2] = Pop(1, LocalType::kWord32).node;
+        inputs[1] = builder_->Int32Constant(LaneValue(kInt32x4MaxLanes));
+        inputs[0] = Pop(0, LocalType::kSimd128).node;
+        TFNode* node = BUILD(SimdOp, opcode, inputs);
+        Push(LocalType::kSimd128, node);
+        len++;
+        break;
+      }
       case kExprI32x4ExtractLane: {
         len = ExtractLane(opcode, LocalType::kWord32);
         break;
       }
       case kExprF32x4ExtractLane: {
         len = ExtractLane(opcode, LocalType::kFloat32);
         break;
       }
       default: {
         FunctionSig* sig = WasmOpcodes::Signature(opcode);
@@ skipping 683 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