Implements optional parameter handling in MIPS vm.

runtime/vm/assembler_mips_test.cc

Index: runtime/vm/assembler_mips_test.cc
===================================================================
--- runtime/vm/assembler_mips_test.cc	(revision 20887)
+++ runtime/vm/assembler_mips_test.cc	(working copy)
@@ -989,6 +989,44 @@
 }
 
 
+ASSEMBLER_TEST_GENERATE(Label_link1, assembler) {
+  Label l;
+
+  __ bgez(ZR, &l);
+  __ bgez(ZR, &l);
+  __ bgez(ZR, &l);
+
+  __ Bind(&l);
+  __ mov(V0, ZR);
+  __ jr(RA);

[regis, 2013/04/03 21:12:39]

Whether the branch is taken or not, the returned result will be zero. How about
inserting LoadImmediate(V0, 1); jr(RA); before the Bind?

[zra, 2013/04/03 21:41:00]

Done.

+}
+
+
+ASSEMBLER_TEST_RUN(Label_link1, test) {
+  typedef int (*SimpleCode)();
+  EXPECT_EQ(0, EXECUTE_TEST_CODE_INT32(SimpleCode, test->entry()));
+}
+
+
+ASSEMBLER_TEST_GENERATE(Label_link2, assembler) {
+  Label l;
+
+  __ beq(ZR, ZR, &l);
+  __ beq(ZR, ZR, &l);
+  __ beq(ZR, ZR, &l);
+

[regis, 2013/04/03 21:12:39]

ditto

[zra, 2013/04/03 21:41:00]

Done.

+  __ Bind(&l);
+  __ mov(V0, ZR);
+  __ jr(RA);
+}
+
+
+ASSEMBLER_TEST_RUN(Label_link2, test) {
+  typedef int (*SimpleCode)();
+  EXPECT_EQ(0, EXECUTE_TEST_CODE_INT32(SimpleCode, test->entry()));
+}
+
+
 ASSEMBLER_TEST_GENERATE(Jalr_delay, assembler) {
   __ mov(R2, RA);
   __ jalr(R2, RA);