mmix-knuth-mmixware is a NO_DOT_IN_LABEL target, so it gets a "_" instead of the "." in the identifier of interest. Also tested and compared to the output for cris-elf which is "regular" regarding labels: there are no "false positive" identifiers there. The "." in a TCL bracket expression matches only a literal ".".
Committed as obvious. gcc/testsuite: * gcc.dg/no_profile_instrument_function-attr-1.c: Adjust scanned regex for NO_DOT_IN_LABEL. --- gcc/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-1.c.orig Wed Jul 22 03:30:54 2020 +++ gcc/gcc/testsuite/gcc.dg/no_profile_instrument_function-attr-1.c Wed Jul 22 03:32:02 2020 @@ -18,7 +18,7 @@ int main () return foo (); } -/* { dg-final { scan-tree-dump-times "__gcov0\\.main.* = PROF_edge_counter" 1 "optimized"} } */ +/* { dg-final { scan-tree-dump-times "__gcov0\[._\]main.* = PROF_edge_counter" 1 "optimized"} } */ /* { dg-final { scan-tree-dump-times "__gcov_indirect_call_profiler_v" 1 "optimized" } } */ /* { dg-final { scan-tree-dump-times "__gcov_time_profiler_counter = " 1 "optimized" } } */ /* { dg-final { scan-tree-dump-times "__gcov_init" 1 "optimized" } } */