Cache current thread in a reserved register and use it in LoadIsolate

runtime/vm/assembler_mips_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_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/os.h"
@@ skipping 2068 matching lines @@
   double res = EXECUTE_TEST_CODE_DOUBLE(SimpleCode, test->entry());
   EXPECT_FLOAT_EQ(-42.42, res, 0.001);
 }
 
 
 // Called from assembler_test.cc.
 // RA: return address.
 // A0: context.
 // A1: value.
 // A2: growable array.
+// A3: current thread.
 ASSEMBLER_TEST_GENERATE(StoreIntoObject, assembler) {
-  __ addiu(SP, SP, Immediate(-2 * kWordSize));
+  __ addiu(SP, SP, Immediate(-3 * kWordSize));
+  __ sw(THR, Address(SP, 2 * kWordSize));
   __ sw(CTX, Address(SP, 1 * kWordSize));
   __ sw(RA, Address(SP, 0 * kWordSize));
-
   __ mov(CTX, A0);
+  __ mov(THR, A3);
   __ StoreIntoObject(A2,
                      FieldAddress(A2, GrowableObjectArray::data_offset()),
                      A1);
   __ lw(RA, Address(SP, 0 * kWordSize));
   __ lw(CTX, Address(SP, 1 * kWordSize));
-  __ addiu(SP, SP, Immediate(2 * kWordSize));
+  __ lw(THR, Address(SP, 2 * kWordSize));
+  __ addiu(SP, SP, Immediate(3 * kWordSize));
   __ Ret();
 }
 
 
 ASSEMBLER_TEST_GENERATE(ComputeRange, assembler) {
   Label miss, done;
   __ ComputeRange(V0, A0, &miss);
   __ b(&done);
 
   __ Bind(&miss);
@@ skipping 38 matching lines @@
 
   EXPECT_EQ(-1, RANGE_OF(Bool::True().raw()));
 
 #undef RANGE_OF
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS