[LLVMdev] isa and friends as an alternative to dynamic cast?

Reid Spencer reid at x10sys.com
Thu Apr 21 20:00:33 PDT 2005

Yeah, I petitioned Chris on this a long time ago but he had a good
reason for not disabling it. I think LLVM uses some minimal RTTI
features, but I can't remember what now.


On Thu, 2005-04-21 at 22:47 -0400, Evan Jones wrote:

> On Thu, 2005-21-04 at 19:43 -0700, Reid Spencer wrote:
> > In case it wasn't obvious from Misha's answer, the main reason for
> > doing this is speed. RTTI is not very quick.
> Right. This is why I was somewhat suprized to see the "isa" facilities
> included in LLVM without also disabling rtti. It will reduce the memory
> footprint a fair bit if you do disable it, at least based on my
> experience with other C++ projects.
> Evan Jones
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Reid Spencer
President & CTO
eXtensible Systems, Inc.
rspencer at x10sys.com
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