Add float128 same-type MPFR tests

Author: overmighty

libc/test/src/math/add_same_type_test.cpp

@@ -20,3 +20,6 @@ LIST_ADD_SAME_TYPE_TESTS(LongDouble, long double, long double,
 #ifdef LIBC_TYPES_HAS_FLOAT16
 LIST_ADD_SAME_TYPE_TESTS(Float16, float16, float16, ADD_FUNC(float16))
 #endif
+#ifdef LIBC_TYPES_HAS_FLOAT128
+LIST_ADD_SAME_TYPE_TESTS(Float128, float128, float128, ADD_FUNC(float128))
+#endif

libc/test/src/math/sub_same_type_test.cpp

@@ -20,3 +20,6 @@ LIST_SUB_SAME_TYPE_TESTS(LongDouble, long double, long double,
 #ifdef LIBC_TYPES_HAS_FLOAT16
 LIST_SUB_SAME_TYPE_TESTS(Float16, float16, float16, SUB_FUNC(float16))
 #endif
+#ifdef LIBC_TYPES_HAS_FLOAT128
+LIST_SUB_SAME_TYPE_TESTS(Float128, float128, float128, SUB_FUNC(float128))
+#endif

libc/utils/MPFRWrapper/MPFRUtils.cpp

@@ -1190,6 +1190,10 @@ template void explain_binary_operation_one_output_error(
 template void explain_binary_operation_one_output_error(
     Operation, const BinaryInput<long double> &, float16, double, RoundingMode);
 #endif
+#ifdef LIBC_TYPES_HAS_FLOAT128
+template void explain_binary_operation_one_output_error(
+    Operation, const BinaryInput<float128> &, float128, double, RoundingMode);
+#endif
 
 template <typename InputType, typename OutputType>
 void explain_ternary_operation_one_output_error(
@@ -1414,6 +1418,12 @@ template bool
 compare_binary_operation_one_output(Operation, const BinaryInput<long double> &,
                                     float16, double, RoundingMode);
 #endif
+#ifdef LIBC_TYPES_HAS_FLOAT128
+template bool compare_binary_operation_one_output(Operation,
+                                                  const BinaryInput<float128> &,
+                                                  float128, double,
+                                                  RoundingMode);
+#endif
 
 template <typename InputType, typename OutputType>
 bool compare_ternary_operation_one_output(Operation op,