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

src/wasm/ast-decoder.cc

Index: src/wasm/ast-decoder.cc
diff --git a/src/wasm/ast-decoder.cc b/src/wasm/ast-decoder.cc
index 84b64d6d8ddf3d02306fbe94d6f1c90abbb17aae..bd9a07de920081ee5ba7a826a0682aeac679b9e5 100644
--- a/src/wasm/ast-decoder.cc
+++ b/src/wasm/ast-decoder.cc
@@ -1290,6 +1290,14 @@ class WasmFullDecoder : public WasmDecoder {
     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)) {
@@ -1302,7 +1310,18 @@ class WasmFullDecoder : public WasmDecoder {
 
   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;