More compact string representation on 64 bit.

runtime/vm/stub_code_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/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 712 matching lines @@
 
   Heap::Space space = Heap::kNew;
   __ ldr(R8, Address(THR, Thread::heap_offset()));
 
   // Calculate and align allocation size.
   // Load new object start and calculate next object start.
   // R1: array element type.
   // R2: array length as Smi.
   // R8: heap.
   __ LoadFromOffset(R0, R8, Heap::TopOffset(space));
-  intptr_t fixed_size = sizeof(RawArray) + kObjectAlignment - 1;
-  __ LoadImmediate(R3, fixed_size);
+  intptr_t fixed_size_plus_alignment_padding =
+      sizeof(RawArray) + kObjectAlignment - 1;
+  __ LoadImmediate(R3, fixed_size_plus_alignment_padding);
   __ add(R3, R3, Operand(R2, LSL, 2));  // R2 is Smi.
   ASSERT(kSmiTagShift == 1);
   __ andi(R3, R3, Immediate(~(kObjectAlignment - 1)));
   // R0: potential new object start.
   // R3: object size in bytes.
   __ adds(R7, R3, Operand(R0));
   __ b(&slow_case, CS);  // Branch if unsigned overflow.
 
   // Check if the allocation fits into the remaining space.
   // R0: potential new object start.
@@ skipping 224 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, 3));
     ASSERT(kSmiTagShift == 1);
     __ andi(R2, R2, Immediate(~(kObjectAlignment - 1)));
 
     NOT_IN_PRODUCT(__ MaybeTraceAllocation(kContextCid, R4, &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 1317 matching lines @@
 
 // Called from switchable IC calls.
 //  R0: receiver
 //  R5: SingleTargetCache
 // Passed to target:
 //  CODE_REG: target Code object
 void StubCode::GenerateSingleTargetCallStub(Assembler* assembler) {
   Label miss;
   __ LoadClassIdMayBeSmi(R1, R0);
   __ ldr(R2, FieldAddress(R5, SingleTargetCache::lower_limit_offset()),
-         kUnsignedWord);
+         kUnsignedHalfword);
   __ ldr(R3, FieldAddress(R5, SingleTargetCache::upper_limit_offset()),
-         kUnsignedWord);
+         kUnsignedHalfword);
 
   __ cmp(R1, Operand(R2));
   __ b(&miss, LT);
   __ cmp(R1, Operand(R3));
   __ b(&miss, GT);
 
   __ ldr(R1, FieldAddress(R5, SingleTargetCache::entry_point_offset()));
   __ ldr(CODE_REG, FieldAddress(R5, SingleTargetCache::target_offset()));
   __ br(R1);
 
@@ skipping 43 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ brk(0);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64