Dear Sir/Madam,
We found that running on intel SPR UnixBench compiled with gcc 10.3 performs worse than with gcc 8.5 for dhry2reg benchmark. I found it related with -fcommon option which is disabled in 10.3 by default. Fcommon will make global variables addresses in special order in bss section(watching by nm -n) whatever they are defined in source code. We are wondering if fcommon has some special performance optimization process? (I also post the subject to gcc-help. Hope to get some suggestion in this mail list. Sorry for bothering.) Best regards. Clark Zhao
