[wasm] Adding a convolution matrix filter test to highlight the performance advantages of JITing

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-containers.h"
 
 #include "src/wasm/ast-decoder.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-module.h"
 #include "src/wasm/wasm-opcodes.h"
 
 #include "src/ostreams.h"
 
 #include "src/compiler/wasm-compiler.h"
-

[Mircea Trofin, 2016/07/22 00:15:58]

why remove this space?

 namespace v8 {
 namespace internal {
 namespace wasm {
 
 #if DEBUG
 #define TRACE(...)                                    \
   do {                                                \
     if (FLAG_trace_wasm_decoder) PrintF(__VA_ARGS__); \
   } while (false)
 #else
@@ skipping 992 matching lines @@
             if (FLAG_wasm_jit_prototype) {
               JITSingleFunctionOperand operand(this, pc_);
               if (Validate(pc_, operand)) {
                 Value index = Pop(2, kAstI32);
                 Value length = Pop(1, kAstI32);
                 Value base = Pop(0, kAstI32);
                 TFNode* call =
                     BUILD(JITSingleFunction, base.node, length.node, index.node,
                           operand.sig_index, operand.sig, position());
                 Push(kAstI32, call);
-                break;
               }
+              len = 1 + operand.length;
+              break;
             }
           }
           default:
             error("Invalid opcode");
             return;
         }
       }  // end complex bytecode
 
 #if DEBUG
       if (FLAG_trace_wasm_decoder) {
@@ skipping 638 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