text: // Copyright 2021 Google LLC
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #include "sparse_matmul/numerics/fixed_types.h"
  
  #include <cstdint>
  
  #include "gtest/gtest.h"
  #include "sparse_matmul/numerics/test_utils.h"
  #include "sparse_matmul/numerics/type_utils.h"
  
  namespace csrblocksparse {
  
  // Basic test that makes sure basic multiplication and TypeOfProduct work
  // correctly.
  TEST(FixedPoint, Multiplication) {
    fixed16<4> a(.1f);
    fixed16<4> b(1.f);
  
    TypeOfProduct<fixed16<4>, fixed16<4>>::type c(a.raw_val() * b.raw_val());
  
    EXPECT_NEAR(static_cast<float>(c), .1f,
                1. / (1 << fixed16<2>::kMantissaBits));
  }
  
  TEST(FixedPoint, SafeCastingIntMax) {
    const float int_max_float = std::numeric_limits<int32_t>::max();
    const csrblocksparse::fixed32<31> int_max_fixed(int_max_float);
    EXPECT_FLOAT_EQ(int_max_float, static_cast<float>(int_max_fixed));
  }
  
  }  // namespace csrblocksparse
  