Intrinsify fixed and growable array allocation on x64.

runtime/vm/intrinsifier_ia32.cc

 // Copyright (c) 2012, 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.
 //
 // The intrinsic code below is executed before a method has built its frame.
 // The return address is on the stack and the arguments below it.
 // Registers EDX (arguments descriptor) and ECX (function) must be preserved.
 // Each intrinsification method returns true if the corresponding
 // Dart method was intrinsified.
 
@@ skipping 18 matching lines @@
 
 bool Intrinsifier::ObjectArray_Allocate(Assembler* assembler) {
   // This snippet of inlined code uses the following registers:
   // EAX, EBX, EDI
   // and the newly allocated object is returned in EAX.
   const intptr_t kTypeArgumentsOffset = 2 * kWordSize;
   const intptr_t kArrayLengthOffset = 1 * kWordSize;
   Label fall_through;
 
   // Compute the size to be allocated, it is based on the array length
-  // and it computed as:
+  // and is computed as:
   // RoundedAllocationSize((array_length * kwordSize) + sizeof(RawArray)).
   __ movl(EDI, Address(ESP, kArrayLengthOffset));  // Array Length.
   // Assert that length is a Smi.
   __ testl(EDI, Immediate(kSmiTagSize));
   __ j(NOT_ZERO, &fall_through);
   __ cmpl(EDI, Immediate(0));
   __ j(LESS, &fall_through);
   intptr_t fixed_size = sizeof(RawArray) + kObjectAlignment - 1;
   __ leal(EDI, Address(EDI, TIMES_2, fixed_size));  // EDI is a Smi.
   ASSERT(kSmiTagShift == 1);
@@ skipping 205 matching lines @@
 // On stack: type argument (+2), data (+1), return-address (+0).
 bool Intrinsifier::GArray_Allocate(Assembler* assembler) {
   // This snippet of inlined code uses the following registers:
   // EAX, EBX
   // and the newly allocated object is returned in EAX.
   const intptr_t kTypeArgumentsOffset = 2 * kWordSize;
   const intptr_t kArrayOffset = 1 * kWordSize;
   Label fall_through;
 
   // Compute the size to be allocated, it is based on the array length
-  // and it computed as:
+  // and is computed as:
   // RoundedAllocationSize(sizeof(RawGrowableObjectArray)) +
   intptr_t fixed_size = GrowableObjectArray::InstanceSize();
 
   Isolate* isolate = Isolate::Current();
   Heap* heap = isolate->heap();
 
   __ movl(EAX, Address::Absolute(heap->TopAddress()));
   __ leal(EBX, Address(EAX, fixed_size));
 
   // Check if the allocation fits into the remaining space.
@@ skipping 1088 matching lines @@
   __ Bind(&is_true);
   __ LoadObject(EAX, bool_true);
   __ ret();
   return true;
 }
 
 #undef __
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32