DBC: Add Smi fastpath to AssertAssignable

runtime/vm/constants_dbc.h

 // Copyright (c) 2016, 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.
 
 #ifndef VM_CONSTANTS_DBC_H_
 #define VM_CONSTANTS_DBC_H_
 
 #include "platform/globals.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 508 matching lines @@
 //  - InstantiateTypeArgumentsTOS D
 //
 //    Instantiate type arguments PP[D] with instantiator SP[0].
 //
 //  - InstanceOf A
 //
 //    Test if instance SP[-3] with type arguments SP[-2] is (A = 0) or is not
 //    (A = 1) a subtype of SP[-1] using SubtypeTestCache SP[0], with result
 //    placed at top of stack.
 //
-//  - AssertAssignable D
+//  - AssertAssignable A, D
 //
 //    Assert that SP[-3] is assignable to variable named SP[0] of type
 //    SP[-1] with type arguments SP[-2] using SubtypeTestCache PP[D].
+//    If A is 1, then the instance may be a Smi.
 //
 //  - BadTypeError
 //
 //    If SP[-3] is non-null, throws a BadType error by calling into the runtime.
 //    Assumes that the stack is arranged the same as for AssertAssignable.
 //
 //  - AssertBoolean A
 //
 //    Assert that TOS is a boolean (A = 1) or that TOS is not null (A = 0).
 //
@@ skipping 247 matching lines @@
   V(Frame,                           D, num, ___, ___) \
   V(SetFrame,                        A, num, ___, num) \
   V(AllocateContext,                 D, num, ___, ___) \
   V(AllocateUninitializedContext,  A_D, reg, num, ___) \
   V(CloneContext,                    0, ___, ___, ___) \
   V(MoveSpecial,                   A_D, reg, num, ___) \
   V(InstantiateType,                 D, lit, ___, ___) \
   V(InstantiateTypeArgumentsTOS,   A_D, num, lit, ___) \
   V(InstanceOf,                      A, num, ___, ___) \
   V(BadTypeError,                    0, ___, ___, ___) \
-  V(AssertAssignable,                D, num, lit, ___) \
+  V(AssertAssignable,              A_D, num, lit, ___) \
   V(AssertBoolean,                   A, num, ___, ___) \
   V(TestSmi,                       A_D, reg, reg, ___) \
   V(TestCids,                      A_D, reg, num, ___) \
   V(CheckSmi,                        A, reg, ___, ___) \
   V(CheckEitherNonSmi,             A_D, reg, reg, ___) \
   V(CheckClassId,                  A_D, reg, num, ___) \
   V(CheckDenseSwitch,              A_D, reg, num, ___) \
   V(CheckCids,                   A_B_C, reg, num, ___) \
   V(CheckStack,                      0, ___, ___, ___) \
   V(DebugStep,                       0, ___, ___, ___) \
@@ skipping 136 matching lines @@
 
 // After a comparison, the condition NEXT_IS_TRUE means the following
 // instruction is executed if the comparision is true and skipped over overwise.
 // Conidition NEXT_IS_FALSE means the following instruction is executed if the
 // comparison is false and skipped over otherwise.
 enum Condition { NEXT_IS_TRUE, NEXT_IS_FALSE };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_DBC_H_