kc3-lang/libjpeg-turbo/simd/arm/neon-compat.h.in

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• Hash : eb14189c
  Author :
  Date : 2020-11-17T12:48:49
  

  Fix Neon SIMD build issues with Visual Studio
  
  - Use the _M_ARM and _M_ARM64 macros provided by Visual Studio for
    compile-time detection of Arm builds, since __arm__ and __aarch64__
    are only present in GNU-compatible compilers.
  - Neon/intrinsics: Use the _CountLeadingZeros() and
    _CountLeadingZeros64() intrinsics provided by Visual Studio, since
    __builtin_clz() and __builtin_clzl() are only present in
    GNU-compatible compilers.
  - Neon/intrinsics: Since Visual Studio does not support static vector
    initialization, replace static initialization of Neon vectors with the
    appropriate intrinsics.  Compared to the static initialization
    approach, this produces identical assembly code with both GCC and
    Clang.
  - Neon/intrinsics: Since Visual Studio does not support inline assembly
    code, provide alternative code paths for Visual Studio whenever inline
    assembly is used.
  - Build: Set FLOATTEST appropriately for AArch64 Visual Studio builds
    (Visual Studio does not emit fused multiply-add [FMA] instructions by
    default for such builds.)
  - Neon/intrinsics: Move temporary buffer allocation outside of nested
    loops.  Since Visual Studio configures Arm builds with a relatively
    small amount of stack memory, attempting to allocate those buffers
    within the inner loops caused a stack overflow.
  
  Closes #461
  Closes #475
  

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• simd/arm/neon-compat.h.in

• /*
   * Copyright (C) 2020, D. R. Commander.  All Rights Reserved.
   * Copyright (C) 2020, Arm Limited.  All Rights Reserved.
   *
   * This software is provided 'as-is', without any express or implied
   * warranty.  In no event will the authors be held liable for any damages
   * arising from the use of this software.
   *
   * Permission is granted to anyone to use this software for any purpose,
   * including commercial applications, and to alter it and redistribute it
   * freely, subject to the following restrictions:
   *
   * 1. The origin of this software must not be misrepresented; you must not
   *    claim that you wrote the original software. If you use this software
   *    in a product, an acknowledgment in the product documentation would be
   *    appreciated but is not required.
   * 2. Altered source versions must be plainly marked as such, and must not be
   *    misrepresented as being the original software.
   * 3. This notice may not be removed or altered from any source distribution.
   */
  
  #cmakedefine HAVE_VLD1_S16_X3
  #cmakedefine HAVE_VLD1_U16_X2
  #cmakedefine HAVE_VLD1Q_U8_X4
  
  /* Define compiler-independent count-leading-zeros macros */
  #if defined(_MSC_VER) && !defined(__clang__)
  #define BUILTIN_CLZ(x)  _CountLeadingZeros(x)
  #define BUILTIN_CLZL(x)  _CountLeadingZeros64(x)
  #elif defined(__clang__) || defined(__GNUC__)
  #define BUILTIN_CLZ(x)  __builtin_clz(x)
  #define BUILTIN_CLZL(x)  __builtin_clzl(x)
  #else
  #error "Unknown compiler"
  #endif
  

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