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From: "Dora, Sunil Kumar" <SunilKumar.Dora@windriver.com>
To: openembedded-core@lists.openembedded.org
Subject: Re: [PATCH 00/11] clang/llvm: Upgrade to 23.1.0
Date: Sat, 05 Sep 2026 06:26:09 -0700	[thread overview]
Message-ID: <135420.1788614769564017900@lists.openembedded.org> (raw)
In-Reply-To: <964.1788497355893282310@lists.openembedded.org>

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On Fri, Sep 4, 2026 at 10:19 AM, Dora, Sunil Kumar wrote:

> 
> I am reducing a testcase and will report it to llvm, will post the link
> here.
> If a fix lands I will request a release/23.x backport.

Hi Khem,

I bisected llvm between 22.1.8 and 23.1.0. The problem comes from the new DFAJumpThreading pass
which is on by default in clang 23. The full file takes more than 90 minutes where clang 22 needs about
2 seconds.

I reported it upstream with a reduced testcase:
https://github.com/llvm/llvm-project/issues/221391

There is also a better workaround than the -disable-lsr I posted earlier. Turning off just the new pass keeps
LSR and behaves the same as clang 22:

CFLAGS:append:toolchain-clang = " -mllvm -enable-dfa-jump-thread=false"

I sent this as v2 of your dovecot patch on openembedded-devel. Once the llvm fix lands I will ask for a
release/23.x backport, then we can drop the workaround.

Thanks,
Sunil Dora

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  reply	other threads:[~2026-09-05 13:26 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-30 12:58 [PATCH 00/11] clang/llvm: Upgrade to 23.1.0 sunilkumar.dora
2026-08-30 12:58 ` [PATCH 01/11] clang/llvm: Upgrade to 23.1.0 release sunilkumar.dora
2026-08-30 19:53   ` Khem Raj
2026-09-01  3:37     ` [OE-core] " Dora, Sunil Kumar
2026-09-01 12:49       ` Richard Purdie
2026-08-30 12:58 ` [PATCH 02/11] spirv-llvm-translator: Upgrade to 23.1.0 sunilkumar.dora
2026-08-30 19:43   ` Khem Raj
2026-09-01  4:07     ` [OE-core] " Dora, Sunil Kumar
2026-08-30 12:58 ` [PATCH 03/11] openmp: Build via the LLVM runtimes entry point sunilkumar.dora
2026-08-30 19:45   ` Khem Raj
2026-09-01  4:33     ` [OE-core] " Dora, Sunil Kumar
2026-09-03  1:11       ` Khem Raj
2026-08-30 12:58 ` [PATCH 04/11] rust: Fix build and oe-selftest failures with LLVM 23 sunilkumar.dora
2026-08-30 19:47   ` Khem Raj
2026-09-01  5:17     ` [OE-core] " Dora, Sunil Kumar
2026-09-03  1:08       ` Khem Raj
2026-08-30 12:58 ` [PATCH 05/11] rust: Do not pass the removed x86 amx-tf32 feature to " sunilkumar.dora
2026-08-30 12:58 ` [PATCH 06/11] clang: Disable clangd's decision-forest completion model on powerpc sunilkumar.dora
2026-08-30 12:58 ` [PATCH 07/11] pango: Don't turn clang 23's -Wunused-but-set-global into an error sunilkumar.dora
2026-08-30 12:58 ` [PATCH 08/11] ovmf: Fix memcpy alias prototype for clang 23 sunilkumar.dora
2026-08-30 12:58 ` [PATCH 09/11] vulkan-samples: Don't turn clang 23's -Wdangling-gsl into an error sunilkumar.dora
2026-08-30 12:58 ` [PATCH 10/11] gettext: Export a fully-flagged Objective-C compiler sunilkumar.dora
2026-08-30 12:58 ` [PATCH 11/11] clang/llvm: Ignore tests fail with clang/llvm 23 upgrade sunilkumar.dora
2026-08-30 19:53 ` [PATCH 00/11] clang/llvm: Upgrade to 23.1.0 Khem Raj
2026-09-01  4:59   ` [OE-core] " Dora, Sunil Kumar
2026-09-03  1:10     ` Khem Raj
2026-09-03 23:46       ` Khem Raj
2026-09-04  4:49         ` Dora, Sunil Kumar
2026-09-05 13:26           ` Dora, Sunil Kumar [this message]
2026-09-05 18:01             ` [OE-core] " Khem Raj

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