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

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• Hash : 74e6ea45
  Author :
  Date : 2021-01-05T20:23:11
  

  Neon: Fix Huffman enc. error w/Visual Studio+Clang
  
  The GNU builtin function __builtin_clzl() accepts an unsigned long
  argument, which is 8 bytes wide on LP64 systems (most Un*x systems,
  including Mac) but 4 bytes wide on LLP64 systems (Windows.)  This caused
  the Neon intrinsics implementation of Huffman encoding to produce
  mathematically incorrect results when compiled using Visual Studio with
  Clang.
  
  This commit changes all invocations of __builtin_clzl() in the Neon SIMD
  extensions to __builtin_clzll(), which accepts an unsigned long long
  argument that is guaranteed to be 8 bytes wide on all systems.
  
  Fixes #480
  Closes #490
  

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• simd/arm/neon-compat.h.in

• /*
   * Copyright (C) 2020, D. R. Commander.  All Rights Reserved.
   * Copyright (C) 2020-2021, 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_CLZLL(x)  _CountLeadingZeros64(x)
  #elif defined(__clang__) || defined(__GNUC__)
  #define BUILTIN_CLZ(x)  __builtin_clz(x)
  #define BUILTIN_CLZLL(x)  __builtin_clzll(x)
  #else
  #error "Unknown compiler"
  #endif
  

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