From: Thomas Munro <tmunro@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: jit: Stop emitting lifetime.end for LLVM 22.
Date: Thu, 02 Apr 2026 03:07:50 +0000
Message-ID: <E1w88PN-002Y4T-3B@gemulon.postgresql.org> (raw)
jit: Stop emitting lifetime.end for LLVM 22.
The lifetime.end intrinsic can now only be used for stack memory
allocated with alloca[1][2][3]. We use it to tell LLVM about the
lifetime of function arguments/isnull values that we keep in palloc'd
memory, so that it can avoid spilling registers to memory.
We might need to rearrange things and put them on the stack, but that'll
take some research. In the meantime, unbreak the build on LLVM 22.
[1] https://github.com/llvm/llvm-project/pull/149310
[2] https://llvm.org/docs/LangRef.html#llvm-lifetime-end-intrinsic
[3] https://llvm.org/docs/LangRef.html#i-alloca
Backpatch-through: 14
Reviewed-by: Matheus Alcantara <matheusssilv97@gmail.com> (earlier attempt)
Reviewed-by: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com> (earlier attempt)
Reviewed-by: Andres Freund <andres@anarazel.de> (earlier attempt)
Discussion: https://postgr.es/m/CA%2BhUKGJTumad75o8Zao-LFseEbt%3DenbUFCM7LZVV%3Dc8yg2i7dg%40mail.gmail.com
Branch
------
REL_17_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/b6d0cddbe27d69cf88ebf0702589e0d05c5c58fa
Modified Files
--------------
src/backend/jit/llvm/llvmjit_expr.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
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To: pgsql-committers@postgresql.org
Cc: tmunro@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: jit: Stop emitting lifetime.end for LLVM 22.
In-Reply-To: <E1w88PN-002Y4T-3B@gemulon.postgresql.org>
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