[wasm] Add native x64 implementations for I32x4Splat, I32x4ExtractLane

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

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 5e1ef6ba1a6994d3bd4ef1396a7f8712ad19492a..3f41970dbefa6b91aeb88f9fd7318d74fde11ebd 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -2032,6 +2032,18 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
       __ 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;