Adds load/store from signed unscaled 9-bit offset w/ no writeback.

runtime/vm/disassembler_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/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 #include "platform/assert.h"
 
@@ skipping 177 matching lines @@
     PrintRegister(rn, R31IsSP);
     if (off != 0) {
       buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
                                  remaining_size_in_buffer(),
                                  ", #%d",
                                  off);
     }
     Print("]");
   } else {
     switch (instr->Bits(10, 2)) {
+      case 0: {
+        // rn + signed 9-bit immediate, pre-index, no writeback.
+        const int32_t imm9 = instr->SImm9Field();
+        Print("[");
+        PrintRegister(rn, R31IsSP);
+        buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
+                           remaining_size_in_buffer(),
+                           ", #%d",
+                           imm9);
+        Print("]");
+        break;
+      }
       case 1: {
         const int32_t imm9 = instr->SImm9Field();
         // rn + signed 9-bit immediate, post-index, writeback.
         Print("[");
         PrintRegister(rn, R31IsSP);
         Print("]");
         buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
                                    remaining_size_in_buffer(),
                                    ", #%d !",
                                    imm9);
         break;
       }
-      case 3: {
-        const int32_t imm9 = instr->SImm9Field();
-        // rn + signed 9-bit immediate, pre-index, writeback.
-        Print("[");
-        PrintRegister(rn, R31IsSP);
-        buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
-                                   remaining_size_in_buffer(),
-                                   ", #%d",
-                                   imm9);
-        Print("] !");
-        break;
-      }
       case 2: {
         const Register rm = instr->RmField();
         const Extend ext = instr->ExtendTypeField();
         const int s = instr->Bit(12);
         Print("[");
         PrintRegister(rn, R31IsSP);
         Print(", ");
         PrintRegister(rm, R31IsZR);
         buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
                                    remaining_size_in_buffer(),
                                    " %s",
                                    extend_names[ext]);
         if (s == 1) {
           Print(" scaled");
         }
         Print("]");
         break;
       }
+      case 3: {
+        const int32_t imm9 = instr->SImm9Field();
+        // rn + signed 9-bit immediate, pre-index, writeback.
+        Print("[");
+        PrintRegister(rn, R31IsSP);
+        buffer_pos_ += OS::SNPrint(current_position_in_buffer(),
+                                   remaining_size_in_buffer(),
+                                   ", #%d",
+                                   imm9);
+        Print("] !");
+        break;
+      }
       default: {
         Print("???");
       }
     }
   }
 }
 
 
 // Handle all register based formatting in these functions to reduce the
 // complexity of FormatOption.
@@ skipping 669 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM