[libre-riscv-dev] whole stack of vulkan llvm spirv stuff

Luke Kenneth Casson Leighton lkcl at lkcl.net
Thu Sep 12 02:12:14 BST 2019

On Thu, Sep 12, 2019 at 12:30 AM Jacob Lifshay <programmerjake at gmail.com> wrote:
> On Wed, Sep 11, 2019, 13:38 Luke Kenneth Casson Leighton <lkcl at lkcl.net>
> wrote:
> > https://github.com/KhronosGroup/SPIRV-LLVM
> the reason I didn't use SPIRV-LLVM is because it only handles the OpenCL
> variant of SPIR-V (last I checked)

the release date is what... four years?  still, i'm supposed to know
these things, in order to be able to make informed decisions!

> as well as being only for much older versions of LLVM.

okaay.  that would explain why AMD forked the whole of LLVM as well:

although it looks like they've been mix-and-match merging.

> >
> > https://github.com/GPUOpen-Drivers/llpc
> >
> > https://hub.packtpub.com/amd-releases-amd-open-source-driver-for-vulkan-v-2019-q1-2/
> >
> > That SPIRV to LLVM compiler is apparently two-way!
> >
> > How did we manage to miss that? moo??
> >
> we would still need the scalar to vector conversion code, which is almost
> all of the spir-v to llvm converter I'm writing as part of Kazan
> (converting scalar spir-v to scalar llvm is trivial by comparison).

okaay, got it.  which, hm, makes me curious as to how the heck AMD did it.


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