Horton

Re: LLVM 22

Thomas Munro <thomas.munro@gmail.com>

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From: Thomas Munro <thomas.munro@gmail.com>
To: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Cc: Matheus Alcantara <matheusssilv97@gmail.com>, Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>
Date: 2026-01-11T07:09:58Z
Lists: pgsql-hackers

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On Sun, Jan 4, 2026 at 6:02 PM Thomas Munro <thomas.munro@gmail.com> wrote:
> On Sat, Jan 3, 2026 at 3:02 PM Thomas Munro <thomas.munro@gmail.com> wrote:
> > 1.  We won't need our local llvm::backport::SectionMemoryManager for
> > LLVM 22, so it will be nice to draw a line under that messy business.
> > See commit message for details.
>
> While that's true, there is a problem with the patch I posted:
> "ReserveAlloc" is not enabled when called from C.  I can't actually
> reproduce the issue locally due to lack of RAM connected to an ARM
> CPU, or I'd have noticed that...  I'll attempt to do something about
> that upstream[1], let's see...  if not, we can still use the new
> in-tree SectionMemoryManager, but we'll still need some C++ glue code.

That was successful, so here is an update.

A new unrelated assertion started firing in LLVM main/22 a few days ago:

    v_nullbytemask = l_int8_const(lc, 1 << ((attnum) & 0x07));
    Assertion failed: (llvm::isUIntN(BitWidth, val) && "Value is not
an N-bit unsigned value")

Here is a fix for that.

Commits

  1. jit: No backport::SectionMemoryManager for LLVM 22.

  2. jit: Stop emitting lifetime.end for LLVM 22.