More compact string representation on 64 bit.

runtime/vm/stub_code_arm.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_ARM)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/cpu.h"
@@ skipping 670 matching lines @@
 
   // Check for maximum allowed length.
   const intptr_t max_len =
       reinterpret_cast<int32_t>(Smi::New(Array::kMaxElements));
   __ CompareImmediate(R3, max_len);
   __ b(&slow_case, GT);
 
   const intptr_t cid = kArrayCid;
   NOT_IN_PRODUCT(__ MaybeTraceAllocation(cid, R4, &slow_case));
 
-  const intptr_t fixed_size = sizeof(RawArray) + kObjectAlignment - 1;
-  __ LoadImmediate(R9, fixed_size);
-  __ add(R9, R9, Operand(R3, LSL, 1));  // R3 is  a Smi.
+  const intptr_t fixed_size_plus_alignment_padding =
+      sizeof(RawArray) + kObjectAlignment - 1;
+  __ LoadImmediate(R9, fixed_size_plus_alignment_padding);
+  __ add(R9, R9, Operand(R3, LSL, 1));  // R3 is a Smi.
   ASSERT(kSmiTagShift == 1);
   __ bic(R9, R9, Operand(kObjectAlignment - 1));
 
   // R9: Allocation size.
   Heap::Space space = Heap::kNew;
   __ ldr(R8, Address(THR, Thread::heap_offset()));
   // Potential new object start.
   __ ldr(R0, Address(R8, Heap::TopOffset(space)));
   __ adds(NOTFP, R0, Operand(R9));  // Potential next object start.
   __ b(&slow_case, CS);             // Branch if unsigned overflow.
@@ skipping 198 matching lines @@
 // Called for inline allocation of contexts.
 // Input:
 //   R1: number of context variables.
 // Output:
 //   R0: new allocated RawContext object.
 void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
   if (FLAG_inline_alloc) {
     Label slow_case;
     // First compute the rounded instance size.
     // R1: number of context variables.
-    intptr_t fixed_size = sizeof(RawContext) + kObjectAlignment - 1;
-    __ LoadImmediate(R2, fixed_size);
+    intptr_t fixed_size_plus_alignment_padding =
+        sizeof(RawContext) + kObjectAlignment - 1;
+    __ LoadImmediate(R2, fixed_size_plus_alignment_padding);
     __ add(R2, R2, Operand(R1, LSL, 2));
     ASSERT(kSmiTagShift == 1);
     __ bic(R2, R2, Operand(kObjectAlignment - 1));
 
     NOT_IN_PRODUCT(__ MaybeTraceAllocation(kContextCid, R8, &slow_case));
     // Now allocate the object.
     // R1: number of context variables.
     // R2: object size.
     const intptr_t cid = kContextCid;
     Heap::Space space = Heap::kNew;
@@ skipping 1389 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ bkpt(0);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM