[LLVMdev] Virtual methods (was: LLVMBuilder vs LLVMFoldingBuilder)
jo at durchholz.org
Fri Apr 4 01:29:59 PDT 2008
Am Donnerstag, den 03.04.2008, 19:29 -0700 schrieb Chris Lattner:
> On Apr 2, 2008, at 9:54 AM, Dominic Hamon wrote:
> > Would it be reasonable for me to submit a patch whereby [...] the
> > LLVMFoldingBuilder methods become virtual overrides of the base
> > class methods?
> No, please don't do this. The idea of llvmbuilder is that it is a
> "free" wrapper around the other existing API calls. Making the
> methods virtual would make them much more expensive.
Wouldn't the class of the objects be known at compile time in most
cases? This is essentially just a case of precomputing constants, so I
think this should be possible.
If yes, the compiler can predetermine the type, hence the virtual method
table that will be used, and can replace the virtual call with a static
Does such an approach make sense with LLVM?
(I'd want to do such things for my personal language project, so the
answer would be affecting compilation strategy.)
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