Horton

Re: JIT compiling with LLVM v12.1

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: pgsql-hackers@postgresql.org
Date: 2018-03-17T06:34:41Z
Lists: pgsql-hackers 
Hi,

On 2018-03-13 16:40:32 -0700, Andres Freund wrote:
> I've pushed a revised and rebased version of my JIT patchset.
> The git tree is at
>   https://git.postgresql.org/git/users/andresfreund/postgres.git
> in the jit branch
>   https://git.postgresql.org/gitweb/?p=users/andresfreund/postgres.git;a=shortlog;h=refs/heads/jit


The biggest change is that this contains docbook docs. Please check it
out, I'm not entirely sure the structure is perfect.  I'll make a
language prettying pass tomorrow, to tired for that now.


> Todo:
> - some build issues with old clang versions pointed out by Thomas Munro

I've added the configure magic to properly detect capabilities of
different clang versions. This doesn't resolve the 3.4 issues Thomas had
reported however, because we still rely on -flto=thin.

If necessary we could support it by adding a 'opt -module-summary $@ -o
$@' to the %.bc rules, but that'd require some version specific
handling. Given that it doesn't yet look necessary I'm loath to go
there.


> - when to take jit_expressions into account (both exec and plan or just
>   latter)

It's just plan time now. There's a new 'jit' GUC that works *both* at
execution time and plan time, and is documented as such.


> - EXPLAIN for queries that are JITed should display units. Starting
>   thread about effort to not duplicate code for that

done.


> - GUC docs (including postgresql.conf.sample)

done.


> - more explanations of type & function signature syncing

Still WIP.


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".