Re: inline (Was: Bloat)

[David Brownlee <abs%NetBSD.org@localhost>]

On Sun, 8 Feb 2009, David Laight wrote:

> On Sat, Feb 07, 2009 at 08:17:23PM +0000, David Brownlee wrote:
> >         Would there be any sense in letting gcc pick when to inline?
> >         Gcc has -finline-functions -finline-limit=N which will
> >         inline any function less than N pseudo instructions. Picking
> >         a small enough value of N should automatically inline all
> >         trivial accessors, and any other function small enough to
> >         benefit. (The default is 600 which is probably too high
> >         for the kernel).
>
> I've wanted it to inline all function that are smaller than 'n'
> AFTER being inlined!
        That would be better, but would the current gcc functionality
        be 'good enough'?

> Someone managed to write some a function that does sub-byte level
> data access (tortuous). However all the callers supply constants
> for the bit-offset and length - so the inlined version should
> be trivial - except I had to do -O3 and increase -finline-limit
> significantly to get them inlined at all.

        Given you've been playing with it - do you know if there is
        any way around the issue Thor commented on - functions not
        being inlined when called from other compilation units?

        Thanks :)

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