3 Commits

Author	SHA1	Message	Date
Fangrui Song	63182c2ac0	[gcov] Add spanning tree optimization ... gcov is an "Edge Profiling with Edge Counters" application according to Optimally Profiling and Tracing Programs (1994). The minimum number of counters necessary is |E|-(|V|-1). The unmeasured edges form a spanning tree. Both GCC --coverage and clang -fprofile-generate leverage this optimization. This patch implements the optimization for clang --coverage. The produced .gcda files are much smaller now.	2020-09-13 00:07:31 -07:00
Fangrui Song	5809a32e7c	[gcov] Add __gcov_dump/__gcov_reset and delete __gcov_flush ... GCC r187297 (2012-05) introduced `__gcov_dump` and `__gcov_reset`. `__gcov_flush = __gcov_dump + __gcov_reset` The resolution to https://gcc.gnu.org/PR93623 ("No need to dump gcdas when forking" target GCC 11.0) removed the unuseful and undocumented __gcov_flush. Close PR38064. Reviewed By: calixte, serge-sans-paille Differential Revision: https://reviews.llvm.org/D83149	2020-07-18 15:07:46 -07:00
Fangrui Song	fba8523fb5	[gcov][test] Reorganize some compiler-rt/test/profile tests	2020-07-03 16:17:16 -07:00