Re: CVS commit: src/sys/sys

[Martin Husemann <martin%duskware.de@localhost>]

On Mon, Mar 21, 2016 at 01:36:22AM +0100, Joerg Sonnenberger wrote:
> In short, this is a real problem and the assumption is not specific to
> clang. Revert now, please.

Is there any other hack around the issue? Marking the symbol weak is a
very strange way to stop the compiler making this assumption. I have
trouble seeing how the mis-optimization can be justified for external
symbols anyway, but this may depend on the type they point to and the
fine print. Your example with local/auto symbols certainly is very
differnent to the link sets case.

How about making the start/end symbols uintptr_t, then calculating the count
upfront and casting start for the iteration?

Martin