[wasm] Add native x64 implementations for I32x4Splat, I32x4ExtractLane

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 2014 matching lines @@
       Operand operand = i.MemoryOperand(&index);
       __ xchgw(i.InputRegister(index), operand);
       break;
     }
     case kX64Xchgl: {
       size_t index = 0;
       Operand operand = i.MemoryOperand(&index);
       __ xchgl(i.InputRegister(index), operand);
       break;
     }
+    case kX64CreateInt32x4: {
+      CpuFeatureScope sse_scope(masm(), SSE4_1);
+      XMMRegister dst = i.OutputSimd128Register();
+      __ movd(dst, i.InputRegister(0));
+      __ shufps(dst, dst, 0x0);
+      break;
+    }
+    case kX64Int32x4ExtractLane: {
+      CpuFeatureScope sse_scope(masm(), SSE4_1);
+      __ pextrd(i.OutputRegister(), i.InputSimd128Register(0), i.InputInt8(1));

[bbudge, 2016/08/23 13:57:13]

Call macro-assembler here: Pextrd

[gdeepti, 2016/08/23 19:53:34]

Sorry, missed this. Calling macro-assembler for Pextrd, Movd. 

+      break;
+    }
     case kCheckedLoadInt8:
       ASSEMBLE_CHECKED_LOAD_INTEGER(movsxbl);
       break;
     case kCheckedLoadUint8:
       ASSEMBLE_CHECKED_LOAD_INTEGER(movzxbl);
       break;
     case kCheckedLoadInt16:
       ASSEMBLE_CHECKED_LOAD_INTEGER(movsxwl);
       break;
     case kCheckedLoadUint16:
@@ skipping 616 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8