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 */