Revert "VM: Simplify lowering of is-tests."

runtime/vm/flow_graph_compiler_mips.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"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 526 matching lines @@
 // - Smi -> compile time subtype check (only if dst class is not parameterized).
 // - Class equality (only if class is not parameterized).
 // Inputs:
 // - A0: object.
 // - A1: instantiator type arguments or raw_null.
 // Returns:
 // - true or false in V0.
 void FlowGraphCompiler::GenerateInstanceOf(TokenPosition token_pos,
                                            intptr_t deopt_id,
                                            const AbstractType& type,
+                                           bool negate_result,
                                            LocationSummary* locs) {
   ASSERT(type.IsFinalized() && !type.IsMalformed() && !type.IsMalbounded());
   ASSERT(!type.IsObjectType() && !type.IsDynamicType());
 
   // Preserve instantiator type arguments (A1).
   __ addiu(SP, SP, Immediate(-1 * kWordSize));
   __ sw(A1, Address(SP, 0 * kWordSize));
 
   Label is_instance, is_not_instance;
   // If type is instantiated and non-parameterized, we can inline code
@@ skipping 29 matching lines @@
     __ LoadObject(TMP, type);
     __ sw(TMP, Address(SP, 2 * kWordSize));  // Push the type.
     __ sw(A1, Address(SP, 1 * kWordSize));   // Push type arguments.
     __ LoadUniqueObject(A0, test_cache);
     __ sw(A0, Address(SP, 0 * kWordSize));
     GenerateRuntimeCall(token_pos, deopt_id, kInstanceofRuntimeEntry, 4, locs);
     // Pop the parameters supplied to the runtime entry. The result of the
     // instanceof runtime call will be left as the result of the operation.
     __ lw(T0, Address(SP, 4 * kWordSize));
     __ addiu(SP, SP, Immediate(5 * kWordSize));
-    __ mov(V0, T0);
+    if (negate_result) {
+      __ LoadObject(V0, Bool::True());
+      __ bne(T0, V0, &done);
+      __ LoadObject(V0, Bool::False());
+    } else {
+      __ mov(V0, T0);
+    }
     __ b(&done);
   }
   __ Bind(&is_not_instance);
-  __ LoadObject(V0, Bool::Get(false));
+  __ LoadObject(V0, Bool::Get(negate_result));
   __ b(&done);
 
   __ Bind(&is_instance);
-  __ LoadObject(V0, Bool::Get(true));
+  __ LoadObject(V0, Bool::Get(!negate_result));
   __ Bind(&done);
   // Remove instantiator type arguments (A1).
   __ Drop(1);
 }
 
 
 // Optimize assignable type check by adding inlined tests for:
 // - NULL -> return NULL.
 // - Smi -> compile time subtype check (only if dst class is not parameterized).
 // - Class equality (only if class is not parameterized).
@@ skipping 1243 matching lines @@
   __ AddImmediate(SP, kDoubleSize);
 }
 
 
 #undef __
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS