MIPS: Use PC realitive instructions on r6.

test/cctest/test-macro-assembler-mips.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 261 matching lines @@
   MacroAssembler assembler(isolate, nullptr, 0,
                            v8::internal::CodeObjectRequired::kYes);
   MacroAssembler* masm = &assembler;
 
   const int kNumCases = 512;
   int values[kNumCases];
   isolate->random_number_generator()->NextBytes(values, sizeof(values));
   Label labels[kNumCases];
   Label done;
 
-  __ addiu(sp, sp, -4);
-  __ sw(ra, MemOperand(sp));
+  __ Push(ra);
 
   {
-    __ BlockTrampolinePoolFor(kNumCases * 2 + 7 + 1);
+    __ BlockTrampolinePoolFor(kNumCases + 6 + 1);
     PredictableCodeSizeScope predictable(
-        masm, kNumCases * kPointerSize + ((7 + 1) * Assembler::kInstrSize));
-    Label here;
+        masm, kNumCases * kPointerSize + ((6 + 1) * Assembler::kInstrSize));
 
-    __ bal(&here);
-    __ sll(at, a0, 2);  // In delay slot.
-    __ bind(&here);
-    __ addu(at, at, ra);
-    __ lw(at, MemOperand(at, 6 * Assembler::kInstrSize));
+    __ addiupc(at, 6 + 1);
+    __ lsa(at, at, a0, 2);
+    __ lw(at, MemOperand(at));
     __ jalr(at);
     __ nop();  // Branch delay slot nop.
     __ bc(&done);
+    // A nop instruction must be generated by the forbidden slot guard
+    // (Assembler::dd(Label*)).
     for (int i = 0; i < kNumCases; ++i) {
       __ dd(&labels[i]);
     }
   }
 
   for (int i = 0; i < kNumCases; ++i) {
     __ bind(&labels[i]);
-    __ lui(v0, (values[i] >> 16) & 0xffff);
-    __ ori(v0, v0, values[i] & 0xffff);
+    __ li(v0, values[i]);
     __ jr(ra);
     __ nop();
   }
 
   __ bind(&done);
-  __ lw(ra, MemOperand(sp));
-  __ addiu(sp, sp, 4);
+  __ Pop(ra);
   __ jr(ra);
   __ nop();
 
   CodeDesc desc;
   masm->GetCode(&desc);
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
 #ifdef OBJECT_PRINT
   code->Print(std::cout);
 #endif
@@ skipping 81 matching lines @@
 
   size_t nr_test_cases = sizeof(tc) / sizeof(TestCaseLsa);
   for (size_t i = 0; i < nr_test_cases; ++i) {
     uint32_t res = run_lsa(tc[i].rt, tc[i].rs, tc[i].sa);
     PrintF("0x%x =? 0x%x == lsa(v0, %x, %x, %hhu)\n", tc[i].expected_res, res,
            tc[i].rt, tc[i].rs, tc[i].sa);
     CHECK_EQ(tc[i].expected_res, res);
   }
 }
 
+
+static uint32_t run_addiupc(int32_t imm21, uint32_t& PC) {
+  Isolate* isolate = CcTest::i_isolate();
+  HandleScope scope(isolate);
+
+  MacroAssembler assm(isolate, NULL, 0, v8::internal::CodeObjectRequired::kYes);
+  MacroAssembler* masm = &assm;
+
+  __ Addiupc(v0, imm21);
+  __ jr(ra);
+  __ nop();
+
+  CodeDesc desc;
+  assm.GetCode(&desc);
+  Handle<Code> code = isolate->factory()->NewCode(
+      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+
+  ::F f = FUNCTION_CAST<::F>(code->entry());
+  PC = reinterpret_cast<uint32_t>(f);  // Set the program counter.
+
+  uint32_t rs = reinterpret_cast<uint32_t>(
+      CALL_GENERATED_CODE(isolate, f, imm21, 0, 0, 0, 0));
+
+  return rs;
+}
+
+
+TEST(Addiupc) {
+  if (!IsMipsArchVariant(kMips32r6)) return;
+
+  CcTest::InitializeVM();
+
+  int32_t tc[] = {
+      INT32_MIN >> 11,      // Min. int21.
+      -4,                   // -1 instruction.
+      0,                    // 0 offset.
+      4,                    // 1 instruction.
+      ((1 << 20) - 1) & ~3  // Max. int21.
+  };
+
+  size_t nr_test_cases = sizeof(tc) / sizeof(int32_t);
+  uint32_t PC = 0;
+  for (size_t i = 0; i < nr_test_cases; ++i) {
+    uint32_t res = run_addiupc(tc[i], PC);
+    // Now, the program_counter (PC) is set.
+    uint32_t expected_res = PC + tc[i];
+    CHECK_EQ(expected_res, res);
+  }
+}
+
 #undef __