On Mon, 11 May 2020, Linus Torvalds wrote:
> On Mon, May 11, 2020 at 2:57 PM Jason A. Donenfeld wrote:
> >
> > GCC 10 appears to have changed -O2 in order to make compilation time
> > faster when using -flto, seemingly at the expense of performance, in
> > particular with regards to how the
On Mon, May 11, 2020 at 6:05 PM Linus Torvalds
wrote:
> There's a reason -O3 isn't even offered as an option.
>
> Maybe things have changed, and maybe they've improved. But I'd like to
> see actual numbers for something like this.
>
> Not inlining as aggressively is not necessarily a bad thing.
On Mon, May 11, 2020 at 5:04 PM Linus Torvalds
wrote:
>
> Not inlining as aggressively is not necessarily a bad thing. It can
> be, of course. But I've actually also done gcc bugreports about gcc
> inlining too much, and generating _worse_ code as a result (ie
> inlinging things that were behind
On Mon, May 11, 2020 at 2:57 PM Jason A. Donenfeld wrote:
>
> GCC 10 appears to have changed -O2 in order to make compilation time
> faster when using -flto, seemingly at the expense of performance, in
> particular with regards to how the inliner works. Since -O3 these days
> shouldn't have the
GCC 10 appears to have changed -O2 in order to make compilation time
faster when using -flto, seemingly at the expense of performance, in
particular with regards to how the inliner works. Since -O3 these days
shouldn't have the same set of bugs as 10 years ago, this commit
defaults new kernel
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