[LLVMdev] stability of llvm ir across releases

[Jeremy Lakeman]

Assembly syntax can and will break between versions. But bitcode should
generally be upgradeable, or a bug should be filed.

On Sat, Mar 14, 2015 at 4:41 PM, Hayden Livingston <halivingston at gmail.com>
wrote:

> Is it safe to assume that LLVM IR will live more-or-less the same for most
> releases, and that significant changes will be communicated?
>
> Or is it something that can change at any time and you must not rely on it
> ever being same.
>
> To me, it seems like the IR has evolved slowly but no spectacularly large
> changes were made in the 1-1.5 years I've been watching it, -- sure some
> experimental patch point, gc stuff, but not your day-to-day types etc
>
> I'm asking because I'm going to take somewhat major dependencies in my
> upcoming system on the IR, and being able to store it across multiple
> releases of my system.
>
> I don't anticipate moving to newer versions of LLVM every time I release,
> but I do imagine wanting to upgrade to let's say LLVM 3.7 or whatever
> releases come by.
>
> Hayden
>
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