Faster 64-bit right-shift for the ia32 compiler.

runtime/vm/assembler_ia32_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_IA32)
 
 #include "vm/assembler.h"
 #include "vm/os.h"
 #include "vm/unit_test.h"
@@ skipping 476 matching lines @@
   __ movl(ECX, Immediate(3));
   __ shll(EAX, Immediate(31));
   __ sarl(EAX, ECX);
   __ cmpl(EAX, Immediate(0xf0000000));
   __ j(EQUAL, &donetest13);
   // Be sure to skip this crashing code.
   __ movl(EAX, Immediate(0));
   __ movl(Address(EAX, 0), EAX);
   __ Bind(&donetest13);
 
+  Label donetest14;
+  __ subl(ESP, Immediate(kWordSize));
+  __ movl(Address(ESP, 0), Immediate(0x80000000));
+  __ movl(EAX, Immediate(0));
+  __ movl(ECX, Immediate(3));
+  __ sarl(Address(ESP, 0), ECX);
+  __ shrd(Address(ESP, 0), EAX);
+  __ cmpl(Address(ESP, 0), Immediate(0x1e000000));
+  __ j(EQUAL, &donetest14);
+  __ int3();
+  __ Bind(&donetest14);
+  __ addl(ESP, Immediate(kWordSize));
+
   __ movl(EAX, Immediate(0));
   __ ret();
 }
 
 
 ASSEMBLER_TEST_RUN(LogicalOps, entry) {
   typedef int (*LogicalOpsCode)();
   EXPECT_EQ(0, reinterpret_cast<LogicalOpsCode>(entry)());
 }
 
@@ skipping 1576 matching lines @@
                      EAX);
   __ popl(EAX);
   __ popl(CTX);
   __ ret();
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32