More compact string representation on 64 bit.

runtime/vm/stub_code_ia32.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_IA32)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 590 matching lines @@
 
   // Check for maximum allowed length.
   const Immediate& max_len =
       Immediate(reinterpret_cast<int32_t>(Smi::New(Array::kMaxElements)));
   __ cmpl(EDX, max_len);
   __ j(GREATER, &slow_case);
 
   NOT_IN_PRODUCT(
       __ MaybeTraceAllocation(kArrayCid, EAX, &slow_case, Assembler::kFarJump));
 
-  const intptr_t fixed_size = sizeof(RawArray) + kObjectAlignment - 1;
-  __ leal(EBX, Address(EDX, TIMES_2, fixed_size));  // EDX is Smi.
+  const intptr_t fixed_size_plus_alignment_padding =
+      sizeof(RawArray) + kObjectAlignment - 1;
+  // EDX is Smi.
+  __ leal(EBX, Address(EDX, TIMES_2, fixed_size_plus_alignment_padding));
   ASSERT(kSmiTagShift == 1);
   __ andl(EBX, Immediate(-kObjectAlignment));
 
   // ECX: array element type.
   // EDX: array length as Smi.
   // EBX: allocation size.
 
   const intptr_t cid = kArrayCid;
   Heap::Space space = Heap::kNew;
   __ movl(EDI, Address(THR, Thread::heap_offset()));
@@ skipping 203 matching lines @@
 // Input:
 // EDX: number of context variables.
 // Output:
 // EAX: new allocated RawContext object.
 // EBX and EDX are destroyed.
 void StubCode::GenerateAllocateContextStub(Assembler* assembler) {
   if (FLAG_inline_alloc) {
     Label slow_case;
     // First compute the rounded instance size.
     // EDX: number of context variables.
-    intptr_t fixed_size = (sizeof(RawContext) + kObjectAlignment - 1);
-    __ leal(EBX, Address(EDX, TIMES_4, fixed_size));
+    intptr_t fixed_size_plus_alignment_padding =
+        (sizeof(RawContext) + kObjectAlignment - 1);
+    __ leal(EBX, Address(EDX, TIMES_4, fixed_size_plus_alignment_padding));
     __ andl(EBX, Immediate(-kObjectAlignment));
 
     NOT_IN_PRODUCT(__ MaybeTraceAllocation(kContextCid, EAX, &slow_case,
                                            Assembler::kFarJump));
 
     // Now allocate the object.
     // EDX: number of context variables.
     const intptr_t cid = kContextCid;
     Heap::Space space = Heap::kNew;
     __ movl(ECX, Address(THR, Thread::heap_offset()));
@@ skipping 25 matching lines @@
     __ subl(EBX, EAX);
     __ addl(EAX, Immediate(kHeapObjectTag));
     // Generate isolate-independent code to allow sharing between isolates.
     NOT_IN_PRODUCT(__ UpdateAllocationStatsWithSize(cid, EBX, EDI, space));
 
     // Calculate the size tag.
     // EAX: new object.
     // EDX: number of context variables.
     {
       Label size_tag_overflow, done;
-      __ leal(EBX, Address(EDX, TIMES_4, fixed_size));
+      __ leal(EBX, Address(EDX, TIMES_4, fixed_size_plus_alignment_padding));
       __ andl(EBX, Immediate(-kObjectAlignment));
       __ cmpl(EBX, Immediate(RawObject::SizeTag::kMaxSizeTag));
       __ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
       __ shll(EBX, Immediate(RawObject::kSizeTagPos - kObjectAlignmentLog2));
       __ jmp(&done);
 
       __ Bind(&size_tag_overflow);
       // Set overflow size tag value.
       __ movl(EBX, Immediate(0));
 
@@ skipping 1238 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32