Horton

Re: JIT compiling with LLVM v12.2

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Thomas Munro <thomas.munro@enterprisedb.com>
Cc: Stephen Frost <sfrost@snowman.net>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2018-03-21T22:46:57Z
Lists: pgsql-hackers 
Hi,

On 2018-03-22 11:36:47 +1300, Thomas Munro wrote:
> On Thu, Mar 22, 2018 at 10:59 AM, Andres Freund <andres@anarazel.de> wrote:
> > On 2018-03-22 10:50:52 +1300, Thomas Munro wrote:
> >> Hmm.  There is no LLVM 6 in backports.
> >
> > I think there now is:
> > https://packages.debian.org/search?keywords=llvm&searchon=names&section=all&suite=stretch-backports
> >
> > Package llvm-6.0-dev
> >
> >     stretch-backports (devel): Modular compiler and toolchain technologies, libraries and headers
> >     1:6.0-1~bpo9+1: amd64
> >
> > It's a recent addition:
> >
> > llvm-toolchain-6.0 (1:6.0-1~bpo9+1) stretch-backports; urgency=medium
> >
> >   * Team upload
> >   * Rebuild for stretch-backports.
> >
> >  -- Anton Gladky <gladk@debian.org>  Mon, 12 Mar 2018 18:58:43 +0100
> 
> Huh, it hasn't made it to my mirror yet.

Interesting.


> Anyway, I upgraded and built with LLVM 6 and make check now passes on
> my arm64 system.  Woohoo!

Yay, thanks for testing!


> Via an off-list exchange I learned that Andres suspects a bug in LLVM
> 3.9 on arm64 and will investigate/maybe file a bug report with LLVM.
> Not sure if we'll want to try to actively identify and avoid known
> buggy versions or not?

I'm currently not inclined to invest a lot of effort into it, besides
trying to get the bug fixed.

A possible testcase would be to call
createLocalIndirectStubsManagerBuilder() and report an error if it
returns nullptr. But that'd fail once the bug is fixed, because we don't
actually *need* that functionality, it's just that LLVM instantiates the
stub manager unconditionally for some reason.

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".