Re: JIT compiling with LLVM v10.1

On Wednesday, February 14, 2018 7:17:10 PM CET Andres Freund wrote:
> Hi,
>
> On 2018-02-07 06:54:05 -0800, Andres Freund wrote:
> > I've pushed v10.0. The big (and pretty painful to make) change is that
> > now all the LLVM specific code lives in src/backend/jit/llvm, which is
> > built as a shared library which is loaded on demand.
> >
> > The layout is now as follows:
> >
> > src/backend/jit/jit.c:
> > Part of JITing always linked into the server. Supports loading the
> > LLVM using JIT library.
> >
> > src/backend/jit/llvm/
> >
> > Infrastructure:
> > llvmjit.c:
> > General code generation and optimization infrastructure
> >
> > llvmjit_error.cpp, llvmjit_wrap.cpp:
> > Error / backward compat wrappers
> >
> > llvmjit_inline.cpp:
> > Cross module inlining support
> >
> > Code-Gen:
> > llvmjit_expr.c
> >
> > Expression compilation
> >
> > llvmjit_deform.c
> >
> > Deform compilation
>
> I've pushed a revised version that hopefully should address Jeff's
> wish/need of being able to experiment with this out of core. There's now
> a "jit_provider" PGC_POSTMASTER GUC that's by default set to
> "llvmjit". llvmjit.so is the .so implementing JIT using LLVM. It fills a
> set of callbacks via
> extern void _PG_jit_provider_init(JitProviderCallbacks *cb);
> which can also be implemented by any other potential provider.
>
> The other two biggest changes are that I've added a README
> https://git.postgresql.org/gitweb/?p=users/andresfreund/postgres.git;a=blob;
> f=src/backend/jit/README;hb=jit and that I've revised the configure support
> so it does more error
> checks, and moved it into config/llvm.m4.
>
> There's a larger smattering of small changes too.
>
> I'm pretty happy with how the separation of core / shlib looks now. I'm
> planning to work on cleaning and then pushing some of the preliminary
> patches (fixed tupledesc, grouping) over the next few days.
>
> Greetings,
>
> Andres Freund

Hi

Here are the LLVM4 and LLVM3.9 compatibility patches.
Successfully built, and executed some silly queries with JIT forced to make
sure it worked.

Pierre