Add signMask getter to Float32x4

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index 2a1a546653f8f7ae2e9cfc73869f1c30032bee20..ff11b9a0b6e02896a1fbe219c9d1ad9bb821dc9b 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -3089,6 +3089,26 @@ void Float32x4ShuffleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+LocationSummary* Simd32x4GetSignMaskInstr::MakeLocationSummary() const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* summary =
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  summary->set_in(0, Location::RequiresFpuRegister());
+  summary->set_out(Location::RequiresRegister());
+  return summary;
+}
+
+
+void Simd32x4GetSignMaskInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  XmmRegister value = locs()->in(0).fpu_reg();
+  Register out = locs()->out().reg();
+
+  __ movmskps(out, value);
+  __ SmiTag(out);
+}
+
+
 LocationSummary* Float32x4ConstructorInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 4;
   const intptr_t kNumTemps = 0;