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Re: [PATCH] asm inline
On Fri, 12 Oct 2018, Segher Boessenkool wrote:
> > Please consider that as currently GCC over-estimates length of such asms,
> > branches around them are emitted as long-range jumps more often than needed,
> > which should be a problem we'd want to solve, because the whole reason this
> > is being raised is because such asms appear in hot code paths. My proposal
> > solves this aspect as well.
>
> The compiler estimates the size of an asm for very different purposes than
> for making inlining decisions. It is pretty good for those other purposes,
> but not great for inlining decisions. Your proposal makes it not good for
> *either*, has a handwavy definition that is hard to reason with, and has
> other problems integrating with the existing GCC code as well.
No, I'm pretty sure that's an unfair assessment of my idea. Can I ask someone
to step in?
Alexander