Hello, optimizing compilers have a tendency to remove assignments that have no side effects. The code in sys/crypto/sha2/sha2.c is doing a lot of zeroing variables, which is however optimized away. I haven't looked close enough to see if all these vars happen to fit into the registers, but a nice overview can be had here:
https://www.spoerlein.net/scan-build/freebsd-head/sbin.gbde/2010-06-05-1/ Compiling the code with/without those assignment results in the same object code. Is there a canonical way to zero those variables and should we use them (memset perhaps? what are the performance implications?) Regards, Uli _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
