MIPS: Fix Sltu macro instruction.

test/cctest/test-macro-assembler-mips64.cc

Index: test/cctest/test-macro-assembler-mips64.cc
diff --git a/test/cctest/test-macro-assembler-mips64.cc b/test/cctest/test-macro-assembler-mips64.cc
index 5f9451027c90f03d1e7e372d4a0455779b7c444c..1dc260ff01c1e512cc27c7cf03dcce49b04044b1 100644
--- a/test/cctest/test-macro-assembler-mips64.cc
+++ b/test/cctest/test-macro-assembler-mips64.cc
@@ -1901,4 +1901,68 @@ TEST(Uldc1) {
   }
 }
 
+static const std::vector<uint64_t> sltu_test_values() {
+  static const uint64_t kValues[] = {
+      0,
+      1,
+      0x7ffe,
+      0x7fff,
+      0x8000,
+      0x8001,
+      0xfffe,
+      0xffff,
+      0xffffffffffff7ffe,
+      0xffffffffffff7fff,
+      0xffffffffffff8000,
+      0xffffffffffff8001,
+      0xfffffffffffffffe,
+      0xffffffffffffffff,
+  };
+  return std::vector<uint64_t>(&kValues[0], &kValues[arraysize(kValues)]);
+}
+
+template <typename Func>
+bool run_Sltu(uint64_t rs, uint64_t rd, Func GenerateSltuInstructionFunc) {
+  typedef int64_t (*F_CVT)(uint64_t x0, uint64_t x1, int x2, int x3, int x4);
+
+  Isolate* isolate = CcTest::i_isolate();
+  HandleScope scope(isolate);
+  MacroAssembler assm(isolate, nullptr, 0,
+                      v8::internal::CodeObjectRequired::kYes);
+  MacroAssembler* masm = &assm;
+
+  GenerateSltuInstructionFunc(masm, rd);
+  __ jr(ra);
+  __ nop();
+
+  CodeDesc desc;
+  assm.GetCode(&desc);
+  Handle<Code> code = isolate->factory()->NewCode(
+      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+
+  F_CVT f = FUNCTION_CAST<F_CVT>(code->entry());
+  int64_t res = reinterpret_cast<int64_t>(
+      CALL_GENERATED_CODE(isolate, f, rs, rd, 0, 0, 0));
+  return res == 1;
+}
+
+TEST(Sltu) {
+  CcTest::InitializeVM();
+
+  FOR_UINT64_INPUTS(i, sltu_test_values) {
+    FOR_UINT64_INPUTS(j, sltu_test_values) {
+      uint64_t rs = *i;
+      uint64_t rd = *j;
+
+      CHECK_EQ(rs < rd, run_Sltu(rs, rd,
+                                 [](MacroAssembler* masm, uint64_t imm) {
+                                   __ Sltu(v0, a0, Operand(imm));
+                                 }));
+      CHECK_EQ(rs < rd,
+               run_Sltu(rs, rd, [](MacroAssembler* masm,
+                                   uint64_t imm) { __ Sltu(v0, a0, a1); }));
+    }
+  }
+}
+
 #undef __