Make NO_VAL constants templated

Author: pavelkryukov

simulator/infra/macro.h

@@ -112,6 +112,15 @@ static constexpr inline size_t count_leading_ones(const T& value) noexcept
     return count_leading_zeroes<T>( ~value);
 }
 
+/* 
+ * Templated no-value (non-trivial data of given size)
+ */
+template<typename T> constexpr T NO_VAL = all_ones<T>();
+template<> constexpr uint8  NO_VAL<uint8>  = NO_VAL8;
+template<> constexpr uint16 NO_VAL<uint16> = NO_VAL16;
+template<> constexpr uint32 NO_VAL<uint32> = NO_VAL32;
+template<> constexpr uint64 NO_VAL<uint64> = NO_VAL64;
+
 /*
  * Performs an arithmetic right shift, i.e. shift with progapating
  * the most significant bit.

simulator/mips/mips_instr.h

@@ -135,14 +135,9 @@ class MIPSInstr
 
         enum class RegType : uint8
         {
-            RS,
-            RT,
-            RD,
-            ZERO,
-            HI,
-            LO,
-            HI_LO,
-            RA
+            RS, RT, RD,
+            ZERO, RA,
+            HI, LO, HI_LO
         };
 
         static bool is_explicit_register( RegType type)
@@ -182,11 +177,11 @@ class MIPSInstr
         auto sign_extend() const { return static_cast<RegisterSInt>( static_cast<int16>(v_imm)); }
         auto zero_extend() const { return static_cast<RegisterUInt>( static_cast<uint16>(v_imm)); }
 
-        RegisterUInt v_src1 = static_cast<RegisterUInt>(NO_VAL64);
-        RegisterUInt v_src2 = static_cast<RegisterUInt>(NO_VAL64);
-        RegisterUInt v_dst  = static_cast<RegisterUInt>(NO_VAL64);
-        RegisterUInt v_dst2 = static_cast<RegisterUInt>(NO_VAL64);
-        RegisterUInt mask = all_ones<RegisterUInt>();
+        RegisterUInt v_src1 = NO_VAL<RegisterUInt>;
+        RegisterUInt v_src2 = NO_VAL<RegisterUInt>;
+        RegisterUInt v_dst  = NO_VAL<RegisterUInt>;
+        RegisterUInt v_dst2 = NO_VAL<RegisterUInt>;
+        RegisterUInt mask   = all_ones<RegisterUInt>();
 
         uint16 shamt = NO_VAL16;
         Addr mem_addr = NO_VAL32;