Splits up dependent load in update of allocation stats.

runtime/vm/assembler_arm.h

 // 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.
 
 #ifndef VM_ASSEMBLER_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
@@ skipping 782 matching lines @@
   void EnterStubFrame(bool load_pp = false);
   void LeaveStubFrame();
 
   // Instruction pattern from entrypoint is used in Dart frame prologs
   // to set up the frame and save a PC which can be used to figure out the
   // RawInstruction object corresponding to the code running in the frame.
   static intptr_t EntryPointToPcMarkerOffset() {
     return TargetCPUFeatures::store_pc_read_offset();
   }
 
-  void UpdateAllocationStats(intptr_t cid,
-                             Register temp_reg,
-                             Heap::Space space);
-
-  void UpdateAllocationStatsWithSize(intptr_t cid,
-                                     Register size_reg,
-                                     Register temp_reg,
-                                     Heap::Space space);
+  // The register into which the allocation stats table is loaded with
+  // LoadAllocationStatsAddress should be passed to
+  // IncrementAllocationStats(WithSize) as stats_addr_reg to update the
+  // allocation stats. These are separate assembler macros so we can
+  // avoid a dependent load too nearby the load of the table address.
+  void LoadAllocationStatsAddress(Register dest,
+                                  intptr_t cid,
+                                  Heap::Space space);
+  void IncrementAllocationStats(Register stats_addr,
+                                intptr_t cid,
+                                Heap::Space space);
+  void IncrementAllocationStatsWithSize(Register stats_addr_reg,
+                                        Register size_reg,
+                                        intptr_t cid,
+                                        Heap::Space space);
 
   Address ElementAddressForIntIndex(bool is_load,
                                     bool is_external,
                                     intptr_t cid,
                                     intptr_t index_scale,
                                     Register array,
                                     intptr_t index,
                                     Register temp);
 
   Address ElementAddressForRegIndex(bool is_load,
@@ skipping 175 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_