Re: [TCWG CI] Regression caused by llvm: [TypePromotion] Search from ZExt + PHI

From: Nathan Chancellor <nathan@kernel.org>
To: ci_notify@linaro.org
Cc: Andre Vieira <andre.simoesdiasvieira@arm.com>, llvm@lists.linux.dev
Subject: Re: [TCWG CI] Regression caused by llvm: [TypePromotion] Search from ZExt + PHI
Date: Mon, 15 Aug 2022 17:46:11 -0700	[thread overview]
Message-ID: <Yvro06Uid0t0Ou1M@dev-arch.thelio-3990X> (raw)
In-Reply-To: <1465164958.6648.1660602445528@jenkins.jenkins>

On Mon, Aug 15, 2022 at 10:27:24PM +0000, ci_notify@linaro.org wrote:
> [TCWG CI] Regression caused by llvm: [TypePromotion] Search from ZExt + PHI:
> commit 164067918725d1ee8875e38213b6aee9be13383e
> Author: Andre Vieira <andre.simoesdiasvieira@arm.com>
> 
>     [TypePromotion] Search from ZExt + PHI
> 
> Results regressed to
> # reset_artifacts:
> -10
> # build_abe binutils:
> -9
> # build_kernel_llvm:
> -5
> # build_abe qemu:
> -2
> # linux_n_obj:
> 6329
> # First few build errors in logs:
> # 00:12:33 ld.lld: error: undefined symbol: __aeabi_uldivmod
> # 00:12:33 make: *** [Makefile:1208: vmlinux] Error 1

I noticed this towards the end of last week too:

https://github.com/ClangBuiltLinux/linux/issues/1688

I added some reduced reproducers to that thread. As I note in the
original post of that issue, I am not sure if this error is a standalone
problem or one that comes from another problem we are actively dealing
with:

https://github.com/ClangBuiltLinux/linux/issues/1666
https://github.com/llvm/llvm-project/issues/56153

Cheers,
Nathan