text: //=================================================================================================
  /*!
  //  \file blaze/math/typetraits/HasSIMDSub.h
  //  \brief Header file for the HasSIMDSub type trait
  //
  //  Copyright (C) 2012-2020 Klaus Iglberger - All Rights Reserved
  //
  //  This file is part of the Blaze library. You can redistribute it and/or modify it under
  //  the terms of the New (Revised) BSD License. Redistribution and use in source and binary
  //  forms, with or without modification, are permitted provided that the following conditions
  //  are met:
  //
  //  1. Redistributions of source code must retain the above copyright notice, this list of
  //     conditions and the following disclaimer.
  //  2. Redistributions in binary form must reproduce the above copyright notice, this list
  //     of conditions and the following disclaimer in the documentation and/or other materials
  //     provided with the distribution.
  //  3. Neither the names of the Blaze development group nor the names of its contributors
  //     may be used to endorse or promote products derived from this software without specific
  //     prior written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  //  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  //  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  //  SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  //  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  //  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  //  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  //  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  //  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  //  DAMAGE.
  */
  //=================================================================================================
  
  #ifndef _BLAZE_MATH_TYPETRAITS_HASSIMDSUB_H_
  #define _BLAZE_MATH_TYPETRAITS_HASSIMDSUB_H_
  
  
  //*************************************************************************************************
  // Includes
  //*************************************************************************************************
  
  #include <blaze/system/Vectorization.h>
  #include <blaze/util/Complex.h>
  #include <blaze/util/EnableIf.h>
  #include <blaze/util/IntegralConstant.h>
  #include <blaze/util/typetraits/IsIntegral.h>
  #include <blaze/util/typetraits/IsNumeric.h>
  #include <blaze/util/typetraits/RemoveCVRef.h>
  
  
  namespace blaze {
  
  //=================================================================================================
  //
  //  CLASS DEFINITION
  //
  //=================================================================================================
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  /*!\brief Auxiliary alias declaration for the HasSIMDSub type trait.
  // \ingroup math_type_traits
  */
  template< typename T1        // Type of the left-hand side operand
          , typename T2        // Type of the right-hand side operand
          , typename = void >  // Restricting condition
  struct HasSIMDSubHelper
     : public FalseType
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  template< typename T1, typename T2 >
  struct HasSIMDSubHelper< T1, T2, EnableIf_t< IsNumeric_v<T1> && IsIntegral_v<T1> &&
                                               IsNumeric_v<T2> && IsIntegral_v<T2> &&
                                               sizeof(T1) == sizeof(T2) > >
     : public BoolConstant< ( bool( BLAZE_SSE2_MODE ) ) ||
                            ( bool( BLAZE_AVX2_MODE ) ) ||
                            ( bool( BLAZE_MIC_MODE      ) && sizeof(T1) >= 4UL ) ||
                            ( bool( BLAZE_AVX512F_MODE  ) && sizeof(T1) >= 4UL ) ||
                            ( bool( BLAZE_AVX512BW_MODE ) && sizeof(T1) <= 2UL ) >
  {};
  
  template< typename T >
  struct HasSIMDSubHelper< complex<T>, complex<T>, EnableIf_t< IsNumeric_v<T> && IsIntegral_v<T> > >
     : public BoolConstant< ( bool( BLAZE_SSE2_MODE ) ) ||
                            ( bool( BLAZE_AVX2_MODE ) ) ||
                            ( bool( BLAZE_MIC_MODE      ) && sizeof(T) >= 4UL ) ||
                            ( bool( BLAZE_AVX512F_MODE  ) && sizeof(T) >= 4UL ) ||
                            ( bool( BLAZE_AVX512BW_MODE ) && sizeof(T) <= 2UL ) >
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  template<>
  struct HasSIMDSubHelper< float, float >
     : public BoolConstant< bool( BLAZE_SSE_MODE     ) ||
                            bool( BLAZE_AVX_MODE     ) ||
                            bool( BLAZE_MIC_MODE     ) ||
                            bool( BLAZE_AVX512F_MODE ) >
  {};
  
  template<>
  struct HasSIMDSubHelper< complex<float>, complex<float> >
     : public BoolConstant< bool( BLAZE_SSE_MODE     ) ||
                            bool( BLAZE_AVX_MODE     ) ||
                            bool( BLAZE_MIC_MODE     ) ||
                            bool( BLAZE_AVX512F_MODE ) >
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*! \cond BLAZE_INTERNAL */
  template<>
  struct HasSIMDSubHelper< double, double >
     : public BoolConstant< bool( BLAZE_SSE2_MODE    ) ||
                            bool( BLAZE_AVX_MODE     ) ||
                            bool( BLAZE_MIC_MODE     ) ||
                            bool( BLAZE_AVX512F_MODE ) >
  {};
  
  template<>
  struct HasSIMDSubHelper< complex<double>, complex<double> >
     : public BoolConstant< bool( BLAZE_SSE2_MODE    ) ||
                            bool( BLAZE_AVX_MODE     ) ||
                            bool( BLAZE_MIC_MODE     ) ||
                            bool( BLAZE_AVX512F_MODE ) >
  {};
  /*! \endcond */
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*!\brief Availability of a SIMD subtraction for the given data types.
  // \ingroup math_type_traits
  //
  // Depending on the available instruction set (SSE, SSE2, SSE3, SSE4, AVX, AVX2, MIC, ...) and
  // the used compiler, this type trait provides the information whether a SIMD subtraction operation
  // exists for the two given data types \a T1 and \a T2 (ignoring the cv-qualifiers). In case the
  // SIMD subtraction is available, the \a value member constant is set to \a true, the nested type
  // definition \a Type is \a TrueType, and the class derives from \a TrueType. Otherwise \a value
  // is set to \a false, \a Type is \a FalseType, and the class derives from \a FalseType. The
  // following example assumes that AVX is available:
  
     \code
     blaze::HasSIMDSub< int, int >::value     // Evaluates to 1
     blaze::HasSIMDSub< float, float >::Type  // Results in TrueType
     blaze::HasSIMDSub< double, double >      // Is derived from TrueType
     blaze::HasSIMDSub< bool, bool >::value   // Evaluates to 0
     blaze::HasSIMDSub< float, int >::Type    // Results in FalseType
     blaze::HasSIMDSub< double, float >       // Is derived from FalseType
     \endcode
  */
  template< typename T1        // Type of the left-hand side operand
          , typename T2        // Type of the right-hand side operand
          , typename = void >  // Restricting condition
  struct HasSIMDSub
     : public BoolConstant< HasSIMDSubHelper< RemoveCVRef_t<T1>, RemoveCVRef_t<T2> >::value >
  {};
  //*************************************************************************************************
  
  
  //*************************************************************************************************
  /*!\brief Auxiliary variable template for the HasSIMDSub type trait.
  // \ingroup math_type_traits
  //
  // The HasSIMDSub_v variable template provides a convenient shortcut to access the nested
  // \a value of the HasSIMDSub class template. For instance, given the types \a T1 and \a T2
  // the following two statements are identical:
  
     \code
     constexpr bool value1 = blaze::HasSIMDSub<T1,T2>::value;
     constexpr bool value2 = blaze::HasSIMDSub_v<T1,T2>;
     \endcode
  */
  template< typename T1    // Type of the left-hand side operand
          , typename T2 >  // Type of the right-hand side operand
  constexpr bool HasSIMDSub_v = HasSIMDSub<T1,T2>::value;
  //*************************************************************************************************
  
  } // namespace blaze
  
  #endif
  