Fix bug in ParallelMoveResolver::EmitSwap: implement swaps of FPU spill slots.

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 2770 matching lines @@
 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, kUnboxedDouble));
+  result->set_in(0, Location::FpuRegisterLocation(XMM1));
   if (InputCount() == 2) {
-    result->set_in(1, Location::FpuRegisterLocation(XMM2, kUnboxedDouble));
+    result->set_in(1, Location::FpuRegisterLocation(XMM2));
   }
-  result->set_out(Location::FpuRegisterLocation(XMM1, kUnboxedDouble));
+  result->set_out(Location::FpuRegisterLocation(XMM1));
   return result;
 }
 
 
 void InvokeMathCFunctionInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(locs()->in(0).fpu_reg() == XMM1);
   __ EnterFrame(0);
   __ ReserveAlignedFrameSpace(0);
   __ movaps(XMM0, locs()->in(0).fpu_reg());
   if (InputCount() == 2) {
@@ skipping 550 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64