Horton

Re: JIT compiling with LLVM v11

Andres Freund <andres@anarazel.de>

View thread View on postgr.es
From: Andres Freund <andres@anarazel.de>
To: Catalin Iacob <iacobcatalin@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Thomas Munro <thomas.munro@enterprisedb.com>, Pg Hackers <pgsql-hackers@postgresql.org>, Pierre Ducroquet <p.psql@pinaraf.info>
Date: 2018-03-15T18:34:03Z
Lists: pgsql-hackers 
Hi,

On 2018-03-15 19:14:09 +0100, Catalin Iacob wrote:
> For RHEL proper, I would guess that PG11 is too late for RHEL8 which,
> according to history, should be coming soon.

Yea.


> For RHEL9 I would really expect RedHat to add llvm and clang to proper
> RHEL and build/run against those, even if they add it only for
> Postgres (like they did for mesa).

By the looks of what's going to come for RHEL8 I think it already
contains a suitable LLVM and clang (i.e. >= 3.9)?


> As far as I know clang does promise gcc compatibility in
> the sense that one can link together .o files compiled with both so I
> expect the combination not to cause issues (assuming the other
> compiler flags affecting binary compatibility are aligned).

Right. But that's not even needed, as we just use plain old C ABI via
dlsym(). Nothing needs to be linked together outside of dlsym(), so I'm
not too concerned about that aspect.

Greetings,

Andres Freund

Commits

  1. Improve JIT docs.

  2. Add documentation for the JIT feature.

  3. Add EXPLAIN support for JIT.

  4. Add inlining support to LLVM JIT provider.

  5. JIT tuple deforming in LLVM JIT provider.

  6. Add FIELDNO_* macro designating offset into structs required for JIT.

  7. Add expression compilation support to LLVM JIT provider.

  8. Expand list of synchronized types and functions in LLVM JIT provider.

  9. Add helpers for emitting LLVM IR.

  10. Basic planner and executor integration for JIT.

  11. Debugging and profiling support for LLVM JIT provider.

  12. Support for optimizing and emitting code in LLVM JIT provider.

  13. Add file containing extensions of the LLVM C API.

  14. Basic JIT provider and error handling infrastructure.

  15. Add configure infrastructure (--with-llvm) to enable LLVM support.

  16. Add C++ support to configure.

  17. Add PGAC_PROG_VARCC_VARFLAGS_OPT autoconf macro.

  18. Fix VM buffer pin management in heap_lock_updated_tuple_rec().

  19. Allow tupleslots to have a fixed tupledesc, use in executor nodes.

  20. Expression evaluation based aggregate transition invocation.

  21. Perform slot validity checks in a separate pass over expression.

  22. Rely on executor utils to build targetlist for DML RETURNING.

  23. Refer to OS X as "macOS", except for the port name which is still "darwin".