Fix bug on arm64.

runtime/vm/assembler_arm64_test.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"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/os.h"
@@ skipping 374 matching lines @@
   __ ret();
 }
 
 
 ASSEMBLER_TEST_RUN(LoadStoreScaledReg, test) {
   typedef int (*SimpleCode)();
   EXPECT_EQ(42, EXECUTE_TEST_CODE_INT64(SimpleCode, test->entry()));
 }
 
 
+ASSEMBLER_TEST_GENERATE(LoadSigned32Bit, assembler) {
+  __ LoadImmediate(R1, 0xffffffff, kNoPP);
+  __ str(R1, Address(SP, -4, Address::PreIndex, kWord), kWord);
+  __ ldr(R0, Address(SP), kWord);
+  __ ldr(R1, Address(SP, 4, Address::PostIndex, kWord), kWord);
+  __ ret();
+}
+
+
+ASSEMBLER_TEST_RUN(LoadSigned32Bit, test) {
+  typedef int (*SimpleCode)();
+  EXPECT_EQ(-1, EXECUTE_TEST_CODE_INT64(SimpleCode, test->entry()));
+}
+
+
 // Logical register operations.
 ASSEMBLER_TEST_GENERATE(AndRegs, assembler) {
   __ movz(R1, 43, 0);
   __ movz(R2, 42, 0);
   __ and_(R0, R1, Operand(R2));
   __ ret();
 }
 
 
 ASSEMBLER_TEST_RUN(AndRegs, test) {
@@ skipping 1442 matching lines @@
                      R1);
   __ Pop(LR);
   __ Pop(CTX);
   __ PopAndUntagPP();
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_ARCH_ARM64)