[WASM SIMD] Implement primitive shuffles.

src/wasm/function-body-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/base/platform/elapsed-timer.h"
 #include "src/bit-vector.h"
 #include "src/flags.h"
 #include "src/handles.h"
@@ skipping 392 matching lines @@
         break;
     }
     if (operand.shift < 0 || operand.shift >= max_shift) {
       error(pc_ + 2, "invalid shift amount");
       return false;
     } else {
       return true;
     }
   }
 
+  inline bool Validate(const byte* pc, WasmOpcode opcode,
+                       SimdConcatOperand<true>& operand) {
+    DCHECK_EQ(wasm::kExprS8x16Concat, opcode);
+    if (operand.bytes <= 0 || operand.bytes >= kSimd128Size) {
+      error(pc_ + 2, "invalid byte amount");
+      return false;
+    } else {
+      return true;
+    }
+  }
+
   static unsigned OpcodeLength(Decoder* decoder, const byte* pc) {
     switch (static_cast<byte>(*pc)) {
 #define DECLARE_OPCODE_CASE(name, opcode, sig) case kExpr##name:
       FOREACH_LOAD_MEM_OPCODE(DECLARE_OPCODE_CASE)
       FOREACH_STORE_MEM_OPCODE(DECLARE_OPCODE_CASE)
 #undef DECLARE_OPCODE_CASE
       {
         MemoryAccessOperand<true> operand(decoder, pc, UINT32_MAX);
         return 1 + operand.length;
       }
@@ skipping 1044 matching lines @@
     SimdShiftOperand<true> operand(this, pc_);
     if (Validate(pc_, opcode, operand)) {
       compiler::NodeVector inputs(1, zone_);
       inputs[0] = Pop(0, ValueType::kSimd128).node;
       TFNode* node = BUILD(SimdShiftOp, opcode, operand.shift, inputs);
       Push(ValueType::kSimd128, node);
     }
     return operand.length;
   }
 
+  unsigned SimdConcatOp(WasmOpcode opcode) {
+    DCHECK_EQ(wasm::kExprS8x16Concat, opcode);
+    SimdConcatOperand<true> operand(this, pc_);
+    if (Validate(pc_, opcode, operand)) {
+      compiler::NodeVector inputs(2, zone_);
+      inputs[1] = Pop(1, ValueType::kSimd128).node;
+      inputs[0] = Pop(0, ValueType::kSimd128).node;
+      TFNode* node = BUILD(SimdConcatOp, operand.bytes, inputs);
+      Push(ValueType::kSimd128, node);
+    }
+    return operand.length;
+  }
+
   unsigned DecodeSimdOpcode(WasmOpcode opcode) {
     unsigned len = 0;
     switch (opcode) {
       case kExprF32x4ExtractLane: {
         len = SimdExtractLane(opcode, ValueType::kFloat32);
         break;
       }
       case kExprI32x4ExtractLane:
       case kExprI16x8ExtractLane:
       case kExprI8x16ExtractLane: {
@@ skipping 15 matching lines @@
       case kExprI32x4ShrU:
       case kExprI16x8Shl:
       case kExprI16x8ShrS:
       case kExprI16x8ShrU:
       case kExprI8x16Shl:
       case kExprI8x16ShrS:
       case kExprI8x16ShrU: {
         len = SimdShiftOp(opcode);
         break;
       }
+      case kExprS8x16Concat: {
+        len = SimdConcatOp(opcode);
+        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 652 matching lines @@
 BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals,
                                            const byte* start, const byte* end) {
   Decoder decoder(start, end);
   return WasmDecoder::AnalyzeLoopAssignment(&decoder, start,
                                             static_cast<int>(num_locals), zone);
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8