================ @@ -5571,3 +5571,19 @@ but the expression has no runtime effects. Type- and value-dependent expressions are not supported yet. This facility is designed to aid with testing name lookup machinery. + +Predefined Macros +================= + +`__GCC_DESTRUCTIVE_SIZE` and `__GCC_CONSTRUCTIVE_SIZE` +------------------------------------------------------ +Specify the mimum offset between two objects to avoid false sharing and the +maximum size of contiguous memory to promote true sharing, respectively. These +macros are predefined in all C and C++ language modes, but can be redefined on +the command line with ``-D`` to specify different values as needed or can be +undefined on the command line with ``-U`` to disable support for the feature. + +**Note: the values the macros expand to are not stable between releases of Clang +and do not need to match the values produced by GCC, so these macros should not +be used from header files because they may not be stable across multiple TUs +(the values may vary based on compiler version as well as CPU tuning).** ---------------- AaronBallman wrote:
Done! https://github.com/llvm/llvm-project/pull/89446 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
