[simd] Disable Simd Scalar lowering for x64, enable tests for all other architectures.

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index eaa5b6fec6e2202b476c299589bb5a6863e24c94..cbe6acfa534a525ead39d2c3c6fa3106c8a1381d 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -3080,10 +3080,12 @@ void WasmGraphBuilder::Int64LoweringForTesting() {
 }
 
 void WasmGraphBuilder::SimdScalarLoweringForTesting() {
-  SimdScalarLowering(jsgraph()->graph(), jsgraph()->machine(),
-                     jsgraph()->common(), jsgraph()->zone(),
-                     function_signature_)
-      .LowerGraph();
+  if (!CpuFeatures::SupportsSimd128()) {

[bbudge, 2016/11/21 19:48:09]

Can you move the test up into TestGraphBuilder?

https://cs.chromium.org/chromium/src/v8/test/cctest/wasm/wasm-run-utils.h?rcl...

[gdeepti, 2016/11/21 20:56:39]

Done.

+    SimdScalarLowering(jsgraph()->graph(), jsgraph()->machine(),
+                       jsgraph()->common(), jsgraph()->zone(),
+                       function_signature_)
+        .LowerGraph();
+  }
 }
 
 void WasmGraphBuilder::SetSourcePosition(Node* node,
@@ -3348,8 +3350,10 @@ SourcePositionTable* WasmCompilationUnit::BuildGraphForWasmFunction(
     r.LowerGraph();
   }
 
-  SimdScalarLowering(graph, machine, common, jsgraph_->zone(), function_->sig)
-      .LowerGraph();
+  if (!CpuFeatures::SupportsSimd128()) {
+    SimdScalarLowering(graph, machine, common, jsgraph_->zone(), function_->sig)
+        .LowerGraph();
+  }
 
   int index = static_cast<int>(function_->func_index);