kc3-lang/angle/src/common/base/anglebase/numerics/safe_conversions_arm_impl.h

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• Hash : c991eb22
  Author :
  Date : 2022-12-01T14:05:07
  

  Move the anglebase folder up a level
  
  This code originates from Chromium's base/ directory so it doesn't have
  to be under a third-party folder.
  
  Bug: b/260093525
  Change-Id: I0bf6950095c685f36c5c237093980a64cf6e74f0
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4068339
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Nicolas Capens <nicolascapens@google.com>
  

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• src/common/base/anglebase/numerics/safe_conversions_arm_impl.h

• // Copyright 2017 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
  #define BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
  
  #include <cassert>
  #include <limits>
  #include <type_traits>
  
  #include "anglebase/numerics/safe_conversions_impl.h"
  
  namespace angle
  {
  namespace base
  {
  namespace internal
  {
  
  // Fast saturation to a destination type.
  template <typename Dst, typename Src>
  struct SaturateFastAsmOp
  {
      static constexpr bool is_supported =
          std::is_signed<Src>::value && std::is_integral<Dst>::value &&
          std::is_integral<Src>::value &&
          IntegerBitsPlusSign<Src>::value <= IntegerBitsPlusSign<int32_t>::value &&
          IntegerBitsPlusSign<Dst>::value <= IntegerBitsPlusSign<int32_t>::value &&
          !IsTypeInRangeForNumericType<Dst, Src>::value;
  
      __attribute__((always_inline)) static Dst Do(Src value)
      {
          int32_t src = value;
          typename std::conditional<std::is_signed<Dst>::value, int32_t, uint32_t>::type result;
          if (std::is_signed<Dst>::value)
          {
              asm("ssat %[dst], %[shift], %[src]"
                  : [dst] "=r"(result)
                  : [src] "r"(src), [shift] "n"(IntegerBitsPlusSign<Dst>::value <= 32
                                                    ? IntegerBitsPlusSign<Dst>::value
                                                    : 32));
          }
          else
          {
              asm("usat %[dst], %[shift], %[src]"
                  : [dst] "=r"(result)
                  : [src] "r"(src), [shift] "n"(IntegerBitsPlusSign<Dst>::value < 32
                                                    ? IntegerBitsPlusSign<Dst>::value
                                                    : 31));
          }
          return static_cast<Dst>(result);
      }
  };
  
  }  // namespace internal
  }  // namespace base
  }  // namespace angle
  
  #endif  // BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
  

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