Eliminate condition type check when possible.

runtime/vm/intermediate_language_x64.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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 195 matching lines @@
   locs->set_in(0, Location::RegisterLocation(RAX));
   locs->set_out(Location::RegisterLocation(RAX));
   return locs;
 }
 
 
 void AssertBooleanComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register obj = locs()->in(0).reg();
   Register result = locs()->out().reg();
 
-  // Check that the type of the value is allowed in conditional context.
-  // Call the runtime if the object is not bool::true or bool::false.
-  Label done;
-  __ CompareObject(obj, compiler->bool_true());
-  __ j(EQUAL, &done, Assembler::kNearJump);
-  __ CompareObject(obj, compiler->bool_false());
-  __ j(EQUAL, &done, Assembler::kNearJump);
+  if (!IsEliminated()) {
+    // Check that the type of the value is allowed in conditional context.
+    // Call the runtime if the object is not bool::true or bool::false.
+    Label done;
+    __ CompareObject(obj, compiler->bool_true());
+    __ j(EQUAL, &done, Assembler::kNearJump);
+    __ CompareObject(obj, compiler->bool_false());
+    __ j(EQUAL, &done, Assembler::kNearJump);
 
-  __ pushq(obj);  // Push the source object.
-  compiler->GenerateCallRuntime(deopt_id(),
-                                token_pos(),
-                                try_index(),
-                                kConditionTypeErrorRuntimeEntry);
-  // We should never return here.
-  __ int3();
+    __ pushq(obj);  // Push the source object.
+    compiler->GenerateCallRuntime(deopt_id(),
+                                  token_pos(),
+                                  try_index(),
+                                  kConditionTypeErrorRuntimeEntry);
+    // We should never return here.
+    __ int3();
 
-  __ Bind(&done);
+    __ Bind(&done);
+  }
   ASSERT(obj == result);
 }
 
 
 static Condition TokenKindToSmiCondition(Token::Kind kind) {
   switch (kind) {
     case Token::kEQ: return EQUAL;
     case Token::kNE: return NOT_EQUAL;
     case Token::kLT: return LESS;
     case Token::kGT: return GREATER;
@@ skipping 1860 matching lines @@
                                  kNumArgsChecked);
   __ CompareObject(RAX, compiler->bool_true());
   EmitBranchOnCondition(compiler, branch_condition);
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64