> [ adding CCs ]
>
> On Thu, 25 Apr 2019, Josh Poimboeuf wrote:
>
> > Hi all,
> >
> > On IRC, Peter expressed some concern about -flive-patching, specifically
> > that the flag isn't compatible with LTO.
> >
> > The upstream kernel currently doesn't support LTO, but Android is using
> > it with
Hello,
for me as GCC developer, this is definitely an intersting observation. Let
me briefly explain what happen here.
-fguess-branch-probability does a lot more than just BB reordering. The way
GCC works is that it first guesses probability of every branch and then uses
the probabilities to esti
> Hi Linus,
>
> > So right now, I see several reasons not to merge it ("It's so
> > experimental that we don't even want to encourage people to test it"
>
> I don't want them to enable it during allyesconfig because they
> might need more than 4GB of RAM to build it (especially with gcc
> 4.8, 4
> > If data structures could be encapsulated/internalized to
> > subsystems and only global functions are exposed to other
> > subsystems [which are then LTO optimized] then our include
> > file dependencies could become a *lot* simpler.
>
> Yes, long term we could have these benefits.
Yes, LTO
> > > The problem is with the optimization flags: passing -Os causes the
> compiler
> > > to be stupid and not inline any memset/memcpy functions.
> >
> > you get what you ask for.. if you don't want that then don't ask for
> > it ;)
>
> Well, the compiler is really being dumb about -Os and
>
> > Whoa, thanks for explaining that to me -- I didn't know, obviously. I had
> > just written a test program that used "Ir" with an automatic variable
> > defined in the inline function (as is the case with these bitops) and
> > observed that even when I gave > 32 values, it would still work --
> On Wednesday 30 March 2005 05:27, Gerold Jury wrote:
> >
> > >> On Tue, Mar 29, 2005 at 05:37:06PM +0300, Denis Vlasenko wrote:
> > >> > /*
> > >> > * This looks horribly ugly, but the compiler can optimize it totally,
> > >> > * as the count is constant.
> > >> > */
> > >> > static inline vo
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