On MIPS, uses more branch delay slots.

runtime/vm/assembler_mips.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"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
@@ skipping 343 matching lines @@
   }
 }
 
 
 void Assembler::LeaveStubFrame(bool uses_pp) {
   if (uses_pp) {
     addiu(SP, FP, Immediate(-1 * kWordSize));
     lw(RA, Address(SP, 2 * kWordSize));
     lw(FP, Address(SP, 1 * kWordSize));
     lw(PP, Address(SP, 0 * kWordSize));
-    addiu(SP, SP, Immediate(4 * kWordSize));
   } else {
     mov(SP, FP);
     lw(RA, Address(SP, 1 * kWordSize));
     lw(FP, Address(SP, 0 * kWordSize));
+  }
+}
+
+
+void Assembler::LeaveStubFrameSPRestore(bool uses_pp) {
+  if (uses_pp) {
+    addiu(SP, SP, Immediate(4 * kWordSize));
+  } else {
     addiu(SP, SP, Immediate(3 * kWordSize));
   }
 }
 
 
 void Assembler::CallRuntime(const RuntimeEntry& entry) {
   entry.Call(this);
 }
 
 
@@ skipping 178 matching lines @@
     Emit(reinterpret_cast<int32_t>(message));
     Bind(&msg);
     break_(Instr::kMsgMessageCode);
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS