Uses double load/store on arm64, enables tests.

runtime/vm/flow_graph_compiler_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1110 matching lines @@
     __ Pop(left);
   } else {
     __ CompareRegisters(left, right);
   }
 }
 
 
 // This function must be in sync with FlowGraphCompiler::RecordSafepoint and
 // FlowGraphCompiler::SlowPathEnvironmentFor.
 void FlowGraphCompiler::SaveLiveRegisters(LocationSummary* locs) {
-  // TODO(zra): Save live FPU Registers.
+  // TODO(vegorov): consider saving only caller save (volatile) registers.
+  const intptr_t fpu_regs_count = locs->live_registers()->FpuRegisterCount();
+  if (fpu_regs_count > 0) {
+    // Store fpu registers with the lowest register number at the lowest
+    // address.
+    for (intptr_t reg_idx = kNumberOfVRegisters - 1;
+                  reg_idx >= 0; --reg_idx) {
+      VRegister fpu_reg = static_cast<VRegister>(reg_idx);
+      if (locs->live_registers()->ContainsFpuRegister(fpu_reg)) {
+        // TODO(zra): Save the whole V register.
+        __ PushDouble(fpu_reg);
+      }
+    }
+  }
 
   // Store general purpose registers with the highest register number at the
   // lowest address.
   for (intptr_t reg_idx = 0; reg_idx < kNumberOfCpuRegisters; ++reg_idx) {
     Register reg = static_cast<Register>(reg_idx);
     if (locs->live_registers()->ContainsRegister(reg)) {
       __ Push(reg);
     }
   }
 }
 
 
 void FlowGraphCompiler::RestoreLiveRegisters(LocationSummary* locs) {
   // General purpose registers have the highest register number at the
   // lowest address.
   for (intptr_t reg_idx = kNumberOfCpuRegisters - 1; reg_idx >= 0; --reg_idx) {
     Register reg = static_cast<Register>(reg_idx);
     if (locs->live_registers()->ContainsRegister(reg)) {
       __ Pop(reg);
     }
   }
 
-  // TODO(zra): Restore live FPU registers.
+  const intptr_t fpu_regs_count = locs->live_registers()->FpuRegisterCount();
+  if (fpu_regs_count > 0) {
+    // Fpu registers have the lowest register number at the lowest address.
+    for (intptr_t reg_idx = 0; reg_idx < kNumberOfVRegisters; ++reg_idx) {
+      VRegister fpu_reg = static_cast<VRegister>(reg_idx);
+      if (locs->live_registers()->ContainsFpuRegister(fpu_reg)) {
+        // TODO(zra): Restore the whole V register.
+        __ PopDouble(fpu_reg);
+      }
+    }
+  }
 }
 
 
 void FlowGraphCompiler::EmitTestAndCall(const ICData& ic_data,
                                         Register class_id_reg,
                                         intptr_t argument_count,
                                         const Array& argument_names,
                                         Label* deopt,
                                         intptr_t deopt_id,
                                         intptr_t token_index,
@@ skipping 108 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   UNIMPLEMENTED();
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64