On 9 March 2017 at 13:46, Liping Zhang <zlpnobody@xxxxxxxxx> wrote: >> >> Any chance the compiler detects the double assignment and removes the first one? > > This will never happen, since these two assignment statements are not identical. But perhaps the compiler can look beyond the high level statement? a present or future compiler may detect (at low level) that you are indeed writing the very same piece of memory twice in a row. The kernel sources has 'memzero_explicit' [0] but it seems to use 'volatile' which perhaps isn't useful either [1]. Anyway, I was simply curious. [0] http://lxr.free-electrons.com/source/lib/string.c#L679 [1] http://www.daemonology.net/blog/2014-09-04-how-to-zero-a-buffer.html -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
