Re: gcc inlining heuristics was Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

Linus Torvalds
2009-01-12T19:46:25Z

On Mon, 12 Jan 2009, H. Peter Anvin wrote:
>
> This is about storage allocation, not aliases. Storage allocation only
> depends on lifetime.

Well, the thing is, code motion does extend life-times, and if you think
you can move stores across each other (even when you can see that they
alias statically) due to type-based alias decisions, that does essentially
end up making what _used_ to be disjoint lifetimes now be potentially
overlapping.

Linus