Introduce InvokeMathCFunction that can be used to directly invoke mathematical function provided by…

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 1a592752496e40e1aaee4d7167a407ced0fd32ff..83149de4becdba04654076da71249ad1ffec4686 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -2316,6 +2316,40 @@ void DoubleToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+LocationSummary* InvokeMathCFunctionInstr::MakeLocationSummary() const {
+  // Calling convention on x64 uses XMM0 and XMM1 to pass the first two
+  // double arguments and XMM0 to return the result. Unfortunately
+  // currently we can't specify these registers because ParallelMoveResolver
+  // assumes that XMM0 is free at all times.
+  // TODO(vegorov): allow XMM0 to be used.
+  ASSERT((InputCount() == 1) || (InputCount() == 2));
+  const intptr_t kNumTemps = 0;
+  LocationSummary* result =
+      new LocationSummary(InputCount(), kNumTemps, LocationSummary::kCall);
+  result->set_in(0, Location::FpuRegisterLocation(XMM1, Location::kDouble));
+  if (InputCount() == 2) {
+    result->set_in(1, Location::FpuRegisterLocation(XMM2, Location::kDouble));
+  }
+  result->set_out(Location::FpuRegisterLocation(XMM1, Location::kDouble));
+  return result;
+}
+
+
+void InvokeMathCFunctionInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  ASSERT(locs()->in(0).fpu_reg() == XMM1);
+  __ enter(Immediate(0));
+  __ ReserveAlignedFrameSpace(kDoubleSize * InputCount());
+  __ movaps(XMM0, locs()->in(0).fpu_reg());
+  if (InputCount() == 2) {
+    ASSERT(locs()->in(1).fpu_reg() == XMM2);
+    __ movaps(XMM1, locs()->in(1).fpu_reg());
+  }
+  __ CallRuntime(TargetFunction());
+  __ movaps(locs()->out().fpu_reg(), XMM0);
+  __ leave();
+}
+
+
 LocationSummary* PolymorphicInstanceCallInstr::MakeLocationSummary() const {
   return MakeCallSummary();
 }