Re: Compiling c++ template is very slow.

[Nathan Sidwell <nathan at acm dot org>]

On 03/09/2018 08:42 AM, Richard Biener wrote:

> > No. (if it's a vbase, it shows the offset in the complete object, IIRC, and
> > there's other data to let code generation know some vtable inspection is
> > needed when the dynamic type is unknown).
>
> So there's no multiple inheritance of classes with VLA members then I guess.
> Or rather there's no such thing as VLA members ;)

I guess.

> If it's always constant I suggest to make it a non-tree ... I suspect while not
> addressing the complexity it would improve compile-time a lot...

Not disagreeing -- I think there's a bunch of stuff in BINFOs that 
either don't need to be trees, or don't even need to be there.

> Oh, and in the testcase there's no virtual methods so nobody should look
> at BINFO_OFFSET anyway?

It's used for conversions to bases.  (So it's not immediately clear to 
me that making it not a tree would win -- you'd be pushing the 
int->INTEGER_CST conversions into each base conversion generation. 
Don't forget, small integer_csts are commonized)

nathan

--
Nathan Sidwell