On Thu, 25 Oct 2007 13:24:49 +1000
Nick Piggin <[email protected]> wrote:
> Hi,
>
> Andi spotted this exchange on the gcc list. I don't think he's
> brought it up here yet, but it worries me enough that I'd like
> to discuss it.
>
> Starts here
> http://gcc.gnu.org/ml/gcc/2007-10/msg00266.html
>
> Concrete example here
> http://gcc.gnu.org/ml/gcc/2007-10/msg00275.html
>
> Basically, what the gcc developers are saying is that gcc is
> free to load and store to any memory location, so long as it
> behaves as if the instructions were executed in sequence.
>
this optimization btw is a serious mis-optimization, it makes memory
more dirty and causes cachelines to become unshared.... I'm sure it
works great on microbenchmarks but it sucks bigtime for anything real
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
