[Mono-dev] JIT and Inlining - why doesn't it happen?

[Alan McGovern]

This method does not get inlined:

private uint Ch (uint u, uint v, uint w)
{
    return (u&v) ^ (~u&w);
}

If that isn't inlined then don't ask me what kind of method *could* be
inlined by the JIT.

Alan.

On Wed, Apr 30, 2008 at 11:32 PM, Rodrigo Kumpera <kumpera at gmail.com> wrote:

> Mono only inline very short methods. Right now methods must have a body at
> most 20 bytes long.
>
>
>
> 2008/4/30 Alan McGovern <alan.mcgovern at gmail.com>:
>
> > I recently started doing a bit of optimisation work on the
> > hashing/cryptography classes in mono. When working on the managed SHA256
> > class[1], i noticed that mono isn't inlining what i'd consider some *very*
> > simple methods.
> >
> > The helper methods which do the bitshifting (Ro0, Ro1, Ch, Maj etc)
> > aren't inlined! Each of these methods is only called once in the code. By
> > manually inlining those method calls, performance increased significantly -
> > about 70%. Why isn't mono inlining these methods? Can mono be made inline
> > these?
> >
> > Alan.
> >
> > [1]
> > http://anonsvn.mono-project.com/viewcvs/trunk/mcs/class/corlib/System.Security.Cryptography/SHA256Managed.cs?rev=46462&view=markup
> >
> > _______________________________________________
> > Mono-devel-list mailing list
> > Mono-devel-list at lists.ximian.com
> > http://lists.ximian.com/mailman/listinfo/mono-devel-list
> >
> >
>
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