Convert diamond shaped control flow into a single conditional instruction.

runtime/vm/assembler_x64_test.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"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/os.h"
 #include "vm/unit_test.h"
@@ skipping 2273 matching lines @@
 ASSEMBLER_TEST_RUN(ExtractSignBits, test) {
   typedef int (*ExtractSignBits)(double d);
   int res = reinterpret_cast<ExtractSignBits>(test->entry())(1.0);
   EXPECT_EQ(0, res);
   res = reinterpret_cast<ExtractSignBits>(test->entry())(-1.0);
   EXPECT_EQ(1, res);
   res = reinterpret_cast<ExtractSignBits>(test->entry())(-0.0);
   EXPECT_EQ(1, res);
 }
 
+
+ASSEMBLER_TEST_GENERATE(TestSetCC, assembler) {
+  __ movq(RAX, Immediate(0xFFFFFFFF));
+  __ cmpq(RAX, RAX);
+  __ setcc(NOT_EQUAL, AL);
+  __ ret();
+}
+
+
+ASSEMBLER_TEST_RUN(TestSetCC, test) {
+  typedef uword (*TestSetCC)();
+  uword res = reinterpret_cast<TestSetCC>(test->entry())();
+  EXPECT_EQ(0xFFFFFF00, res);
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64