Uses stp/ldp for frame entry/exit on arm64.

runtime/vm/assembler_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"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
@@ skipping 1129 matching lines @@
   if (frame_space != 0) {
     AddImmediate(SP, SP, -frame_space, kNoPP);
   }
   if (OS::ActivationFrameAlignment() > 1) {
     andi(SP, SP, Immediate(~(OS::ActivationFrameAlignment() - 1)));
   }
 }
 
 
 void Assembler::EnterFrame(intptr_t frame_size) {
-  Push(LR);
-  Push(FP);
+  PushPair(LR, FP);
   mov(FP, SP);
 
   if (frame_size > 0) {
     sub(SP, SP, Operand(frame_size));
   }
 }
 
 
 void Assembler::LeaveFrame() {
   mov(SP, FP);
-  Pop(FP);
-  Pop(LR);
+  PopPair(LR, FP);
 }
 
 
 void Assembler::EnterDartFrame(intptr_t frame_size) {
   // Setup the frame.
   adr(TMP, Immediate(-CodeSize()));  // TMP gets PC marker.
   EnterFrame(0);
-  Push(TMP);  // Save PC Marker.
-  TagAndPushPP();  // Save PP.
+  TagAndPushPPAndPcMarker(TMP);  // Save PP and PC marker.
 
   // Load the pool pointer.
   LoadPoolPointer(PP);
 
   // Reserve space.
   if (frame_size > 0) {
     AddImmediate(SP, SP, -frame_size, PP);
   }
 }
 
 
 void Assembler::EnterDartFrameWithInfo(intptr_t frame_size, Register new_pp) {
   // Setup the frame.
   adr(TMP, Immediate(-CodeSize()));  // TMP gets PC marker.
   EnterFrame(0);
-  Push(TMP);  // Save PC Marker.
-  TagAndPushPP();  // Save PP.
+  TagAndPushPPAndPcMarker(TMP);  // Save PP and PC marker.
 
   // Load the pool pointer.
   if (new_pp == kNoPP) {
     LoadPoolPointer(PP);
   } else {
     mov(PP, new_pp);
   }
 
   // Reserve space.
   if (frame_size > 0) {
@@ skipping 76 matching lines @@
     if ((i >= kAbiFirstPreservedFpuReg) && (i <= kAbiLastPreservedFpuReg)) {
       // TODO(zra): When SIMD is added, we must also restore the top
       // 64-bits of the callee-saved registers.
       continue;
     }
     // TODO(zra): Restore the whole V register.
     VRegister reg = static_cast<VRegister>(i);
     PopDouble(reg);
   }
 
-  Pop(FP);
-  Pop(LR);
+  PopPair(LR, FP);
 }
 
 
 void Assembler::CallRuntime(const RuntimeEntry& entry,
                             intptr_t argument_count) {
   entry.Call(this, argument_count);
 }
 
 
 void Assembler::EnterStubFrame(bool load_pp) {
   EnterFrame(0);
-  Push(ZR);  // Push 0 in the saved PC area for stub frames.
-  TagAndPushPP();  // Save caller's pool pointer
+  // Save caller's pool pointer. Push 0 in the saved PC area for stub frames.
+  TagAndPushPPAndPcMarker(ZR);
   if (load_pp) {
     LoadPoolPointer(PP);
   }
 }
 
 
 void Assembler::LeaveStubFrame() {
   // Restore and untag PP.
   LoadFromOffset(PP, FP, kSavedCallerPpSlotFromFp * kWordSize, kNoPP);
   sub(PP, PP, Operand(kHeapObjectTag));
@@ skipping 206 matching lines @@
     add(base, array, Operand(index, LSL, shift));
   }
   const OperandSize size = Address::OperandSizeFor(cid);
   ASSERT(Address::CanHoldOffset(offset, Address::Offset, size));
   return Address(base, offset, Address::Offset, size);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64