Line data    Source code

       1            0 : // Distributed under the MIT License.
       2              : // See LICENSE.txt for details.
       3              : 
       4              : #pragma once
       5              : 
       6              : #if defined(__clang__) && __clang__ < 11
       7              : /// \ingroup PeoGroup
       8              : /// Workarounds for optimizer bugs
       9              : namespace optimizer_hacks {
      10              : /// \ingroup PeoGroup
      11              : /// Produce a situation where the value of `*variable` could have been
      12              : /// changed without the optimizer's knowledge, without actually
      13              : /// changing the variable.
      14              : void indicate_value_can_be_changed(void* variable);
      15              : }  // namespace optimizer_hacks
      16              : 
      17              : #define VARIABLE_CAUSES_CLANG_FPE(var) \
      18              :   ::optimizer_hacks::indicate_value_can_be_changed(&(var))
      19              : #else  /* defined(__clang__) && __clang__ < 11 */
      20              : /// \ingroup PeoGroup
      21              : /// Clang's optimizer has a known bug that sometimes produces spurious
      22              : /// FPEs.  This indicates that the variable `var` can trigger that bug
      23              : /// and prevents some optimizations.  This is fixed upstream in Clang
      24              : /// 11.
      25            1 : #define VARIABLE_CAUSES_CLANG_FPE(var) ((void)(var))
      26              : #endif  /* defined(__clang__) && __clang__ < 11 */