Optimize AOT's switchable calls for the monomorphic case.

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"  // NOLINT
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
@@ skipping 842 matching lines @@
 void Assembler::LeaveStubFrame() {
   LeaveDartFrame();
 }
 
 
 void Assembler::LeaveStubFrameAndReturn(Register ra) {
   LeaveDartFrameAndReturn(ra);
 }
 
 
+void Assembler::NoMonomorphicCheckedEntry() {
+  buffer_.Reset();
+  break_(0);
+  break_(0);
+  break_(0);
+  break_(0);
+  ASSERT(CodeSize() == Instructions::kCheckedEntryOffset);
+}
+
+
+// T0 receiver, S5 guarded cid as Smi
+void Assembler::MonomorphicCheckedEntry() {
+  bool saved_use_far_branches = use_far_branches();
+  set_use_far_branches(false);
+
+  Label have_cid, miss;
+  Bind(&miss);
+  lw(CODE_REG, Address(THR, Thread::monomorphic_miss_stub_offset()));
+  lw(T9, FieldAddress(CODE_REG, Code::entry_point_offset()));
+  jr(T9);
+
+  Comment("MonomorphicCheckedEntry");
+  ASSERT(CodeSize() == Instructions::kCheckedEntryOffset);
+  SmiUntag(S5);
+  LoadClassIdMayBeSmi(S4, T0);
+  bne(S4, S5, &miss);
+
+  // Fall through to unchecked entry.
+  ASSERT(CodeSize() == Instructions::kUncheckedEntryOffset);
+
+  set_use_far_branches(saved_use_far_branches);
+}
+
+
 #ifndef PRODUCT
 void Assembler::MaybeTraceAllocation(intptr_t cid,
                                      Register temp_reg,
                                      Label* trace) {
   ASSERT(cid > 0);
   ASSERT(!in_delay_slot_);
   ASSERT(temp_reg != kNoRegister);
   ASSERT(temp_reg != TMP);
   intptr_t state_offset = ClassTable::StateOffsetFor(cid);
   LoadIsolate(temp_reg);
@@ skipping 392 matching lines @@
   Label stop;
   b(&stop);
   Emit(reinterpret_cast<int32_t>(message));
   Bind(&stop);
   break_(Instr::kStopMessageCode);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS