Fix: #issue76161: error C2440 of 'static_cast': cannot convert from 'InType' to 'OutType'

[Manfredss]

PR Category

Environment Adaptation

PR Types

Bug fixes

Description

fix compile error in paddle/phi/core/framework/data_type_transform.cc

before:

 template <typename InType, typename OutType>
 struct CastDataTypeFunctor {
   HOSTDEVICE inline OutType operator()(InType in) const {
     return static_cast<OutType>(in);
  }
};

after:

template <typename InType, typename OutType>
struct CastDataTypeFunctor {
  HOSTDEVICE inline OutType operator()(InType in) const {
    #if defined(_MSC_VER)
        // 屏蔽 MSVC 不支持的从 float/bfloat8/float16 -> complex 的转换
        if constexpr (
            (std::is_same_v<OutType, phi::dtype::complex<float>> ||
            std::is_same_v<OutType, phi::dtype::complex<double>>) &&
            (std::is_same_v<InType, phi::dtype::float8_e4m3fn> ||
            std::is_same_v<InType, phi::dtype::float8_e5m2> ||
            std::is_same_v<InType, phi::dtype::bfloat16> ||
            std::is_same_v<InType, phi::dtype::float16>)) {
          return OutType(0);  // 默认返回值，仅防止编译错误
        } else
    #endif
        {
          return static_cast<OutType>(in);
        }
      }
};

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[Manfredss]

对 #76161 的修复