Remove checked mode instrinsic for _List.[]=.

runtime/vm/intrinsifier_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"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 15 matching lines @@
 // The R5, R4 registers can be destroyed only if there is no slow-path, i.e.
 // if the intrinsified method always executes a return.
 // The FP register should not be modified, because it is used by the profiler.
 
 #define __ assembler->
 
 
 intptr_t Intrinsifier::ParameterSlotFromSp() { return -1; }
 
 
-static intptr_t ComputeObjectArrayTypeArgumentsOffset() {
-  const Library& core_lib = Library::Handle(Library::CoreLibrary());
-  const Class& cls = Class::Handle(
-      core_lib.LookupClassAllowPrivate(Symbols::_List()));
-  ASSERT(!cls.IsNull());
-  ASSERT(cls.NumTypeArguments() == 1);
-  const intptr_t field_offset = cls.type_arguments_field_offset();
-  ASSERT(field_offset != Class::kNoTypeArguments);
-  return field_offset;
-}
-
-
 // Intrinsify only for Smi value and index. Non-smi values need a store buffer
 // update. Array length is always a Smi.
 void Intrinsifier::ObjectArraySetIndexed(Assembler* assembler) {
+  if (Isolate::Current()->flags().type_checks()) {
+    return;
+  }
+
   Label fall_through;
-
-  if (Isolate::Current()->flags().type_checks()) {
-    const intptr_t type_args_field_offset =
-        ComputeObjectArrayTypeArgumentsOffset();
-    // Inline simple tests (Smi, null), fallthrough if not positive.
-    Label checked_ok;
-    __ ldr(R2, Address(SP, 0 * kWordSize));  // Value.
-
-    // Null value is valid for any type.
-    __ CompareObject(R2, Object::null_object());
-    __ b(&checked_ok, EQ);
-
-    __ ldr(R1, Address(SP, 2 * kWordSize));  // Array.
-    __ ldr(R1, FieldAddress(R1, type_args_field_offset));
-
-    // R1: Type arguments of array.
-    __ CompareObject(R1, Object::null_object());
-    __ b(&checked_ok, EQ);
-
-    // Check if it's dynamic.
-    // Get type at index 0.
-    __ ldr(R0, FieldAddress(R1, TypeArguments::type_at_offset(0)));
-    __ CompareObject(R0, Type::ZoneHandle(Type::DynamicType()));
-    __ b(&checked_ok, EQ);
-
-    // Check for int and num.
-    __ tsti(R2, Immediate(Immediate(kSmiTagMask)));  // Value is Smi?
-    __ b(&fall_through, NE);  // Non-smi value.
-    __ CompareObject(R0, Type::ZoneHandle(Type::IntType()));
-    __ b(&checked_ok, EQ);
-    __ CompareObject(R0, Type::ZoneHandle(Type::Number()));
-    __ b(&fall_through, NE);
-    __ Bind(&checked_ok);
-  }
   __ ldr(R1, Address(SP, 1 * kWordSize));  // Index.
   __ tsti(R1, Immediate(kSmiTagMask));
   // Index not Smi.
   __ b(&fall_through, NE);
   __ ldr(R0, Address(SP, 2 * kWordSize));  // Array.
 
   // Range check.
   __ ldr(R3, FieldAddress(R0, Array::length_offset()));  // Array length.
   __ cmp(R1, Operand(R3));
   // Runtime throws exception.
@@ skipping 2031 matching lines @@
 
 void Intrinsifier::Profiler_getCurrentTag(Assembler* assembler) {
   __ LoadIsolate(R0);
   __ ldr(R0, Address(R0, Isolate::current_tag_offset()));
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64