MIPS: use DAHI/DATH for li macro on mips64r6.

test/cctest/test-assembler-mips64.cc

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@@ skipping 4990 matching lines @@
 
     nr_test_cases = sizeof(dahi_tc) / sizeof(TestCaseAui);
     for (size_t i = 0; i < nr_test_cases; ++i) {
       uint64_t res = run_dahi(dahi_tc[i].rs, dahi_tc[i].offset);
       CHECK_EQ(dahi_tc[i].ref_res, res);
     }
   }
 }
 
 
+uint64_t run_li_macro(uint64_t rs) {
+  Isolate* isolate = CcTest::i_isolate();
+  HandleScope scope(isolate);
+  MacroAssembler assm(isolate, NULL, 0, v8::internal::CodeObjectRequired::kYes);
+
+  __ li(a0, rs);

[ivica.bogosavljevic, 2015/12/21 16:15:56]

There is a third parametar to li macro called LiFlags which has three possible
values: OPTIMIZE_SIZE, CONSTANT_SIZE and ADDRESS_LOAD. You need to test all
three of them to get the full coverage of the code you wrote

[Alan Li, 2016/01/20 14:26:59]

Done.

+  __ mov(v0, a0);
+  __ jr(ra);
+  __ nop();
+
+  CodeDesc desc;
+  assm.GetCode(&desc);
+  Handle<Code> code = isolate->factory()->NewCode(
+      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+
+  F2 f = FUNCTION_CAST<F2>(code->entry());
+
+  uint64_t res =
+    reinterpret_cast<uint64_t>
+    (CALL_GENERATED_CODE(isolate, f, 0, 0, 0, 0, 0));
+
+  return res;
+}
+
+
+TEST(li_macro) {
+    CcTest::InitializeVM();
+
+    uint64_t inputs[] = {
+      0x0000000000000000,

[ivica.bogosavljevic, 2015/12/21 16:15:56]

Looks good

[Alan Li, 2016/01/20 14:26:59]

Acknowledged.

+      0x000000000000ffff,
+      0x00000000ffffffff,
+      0x0000ffffffffffff,
+      0xffffffffffffffff,
+      0xffff000000000000,
+      0xffffffff00000000,
+      0xffffffffffff0000,
+      0xffff0000ffff0000,
+      0x0000ffffffff0000,
+      0x0000ffff0000ffff,
+    };
+
+    size_t nr_test_cases = sizeof(inputs) / sizeof(inputs[0]);
+    for (size_t i = 0; i < nr_test_cases; ++i) {
+      uint64_t res = run_li_macro(inputs[i]);
+      CHECK_EQ(inputs[i], res);
+    }
+}
+
+
 uint64_t run_lwpc(int offset) {
   Isolate* isolate = CcTest::i_isolate();
   HandleScope scope(isolate);
 
   MacroAssembler assm(isolate, NULL, 0, v8::internal::CodeObjectRequired::kYes);
 
   // 256k instructions; 2^8k
   // addiu t3, a4, 0xffff;  (0x250fffff)
   // ...
   // addiu t0, a4, 0x0000;  (0x250c0000)
@@ skipping 804 matching lines @@
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
   F2 f = FUNCTION_CAST<F2>(code->entry());
 
   int64_t res = reinterpret_cast<int64_t>(
       CALL_GENERATED_CODE(isolate, f, 42, 42, 0, 0, 0));
   CHECK_EQ(res, 0);
 }
 
 
 #undef __