[Mesa-dev] [RFC PATCH 00/16] A new IR for Mesa

[Marek Olšák]

Our plan is to always require the latest released version of LLVM
because of new features in our LLVM backend that the radeonsi driver
depends on to advertise all GL features. Some new features listed for
the radeonsi driver in Mesa release notes are only enabled if you have
latest LLVM from git/svn.

Marek

On Wed, Aug 27, 2014 at 8:39 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> On Wed, Aug 27, 2014 at 2:26 PM, John Kessenich <johnk at lunarg.com> wrote:
>> Hi,
>>
>> If Mesa used an LLVM IR for it's shader compiler stack, it would most likely
>>
>> Pick a specific shipped version.  Shipped versions are stable and
>> unchanging.  Upgrading to a newer version would be done only by choice, on
>> Mesa's schedule.
>> Not bring the source into mesa: it works perfectly well sitting next to
>> Mesa.
>> Link it in statically so there are no distro/versioning issues and no
>> interactions with other components of the system that independently use LLVM
>> however they wish.  This is also quite small compared to other uses of LLVM
>> people sometimes discuss.
>>
>> Externally, no one could even tell some helper functions within the compiler
>> stack came from LLVM or a specific version of LLVM.
>
> So... what happens when some backend, say radeonsi, requires a newer
> version? That would become linked to moving the rest of mesa up to a
> newer version, or linking in 2 different versions of llvm (not sure if
> that'd be possible...)
>
>   -ilia
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