Hi, Two independent failures were observed in the test-suite. Both failures are caused by pre-existing undefined behavior in the test programs: 1. Accessing elements through a std::initializer_list after the lifetime of its backing temporary array has ended. 2. Reading uninitialized automatic variables. The commit (efd053f) merely exposed these latent issues through improved lifetime-aware optimization. Therefore, this is the test-suite issue, not a compiler defect.

Please ignore the mail. We will update the test. We apologize for the false detection.

Best regards, Yasuyuki Ohno

Software Development Div., Advanced Technology Development Unit, Fujitsu Research, Fujitsu Limited, JAPAN. ________________________________ 差出人: ci_notify@linaro.org ci_notify@linaro.org 送信日時: 2026年8月21日 21:40 宛先: contact-ci-compiler-test-suite@cs.jp.fujitsu.com contact-ci-compiler-test-suite@cs.jp.fujitsu.com CC: isoard@amd.com isoard@amd.com; maxim.kuvyrkov@linaro.org maxim.kuvyrkov@linaro.org 件名: [Linaro-TCWG-CI] llvmorg-24-init-4794-gefd053f8ef30: 3 regressions on aarch64

Dear contributor,

Our automatic CI has detected problems related to your patch(es). Please find some details below.

In tcwg_flang_test/main-aarch64-Ofast-sve_vls-lto-lld, after: | commit llvmorg-24-init-4794-gefd053f8ef30 | Author: Alexandre Isoard isoard@amd.com | Date: Tue Aug 18 07:36:19 2026 -0700 | | [PromoteMemToReg] Insert store undef when removing lifetime markers (#191909) | | The `lifetime.start` and `lifetime.end` can help avoid the creation of | spurious phi-node. | | ... 20 lines of the commit log omitted.

Produces 3 regressions: | | regressions.sum: | Running test-suite:Fujitsu/C++/0041 ... | FAIL: test-suite :: Fujitsu/C++/0041/Fujitsu-C++-0041_0335.test | FAIL: test-suite :: Fujitsu/C++/0041/Fujitsu-C++-0041_0337.test | Running test-suite:Fujitsu/C/0096 ... | FAIL: test-suite :: Fujitsu/C/0096/Fujitsu-C-0096_0358.test | # "FAIL" means : the execution of the compiled binary failed / output of the binary differs from the expected one

Used configuration : * Toolchain : cmake -G Ninja ../llvm/llvm "-DLLVM_ENABLE_PROJECTS=clang;lld;flang;clang-tools-extra" "-DLLVM_ENABLE_RUNTIMES=openmp" -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=True -DCMAKE_INSTALL_PREFIX=../llvm-install "-DLLVM_TARGETS_TO_BUILD=AArch64" -DCLANG_DEFAULT_LINKER=lld * Testsuite : export LD_LIBRARY_PATH=$\WORKSPACE/llvm-install/lib/aarch64-unknown-linux-gnu${LD_LIBRARY_PATH:+:$\LD_LIBRARY_PATH} cmake -GNinja -DCMAKE_C_COMPILER="$\WORKSPACE/llvm-install/bin2/clang" -DCMAKE_CXX_COMPILER="$\WORKSPACE/llvm-install/bin2/clang++" -DCMAKE_Fortran_COMPILER="$\WORKSPACE/llvm-install/bin2/flang-new" -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS= -DCMAKE_CXX_FLAGS= -DCMAKE_Fortran_FLAGS= -DCMAKE_C_FLAGS_RELEASE="-O3 -ffast-math -march=armv8.4-a+sve -msve-vector-bits=256 -flto -fuse-ld=lld -DNDEBUG" -DCMAKE_CXX_FLAGS_RELEASE="-O3 -ffast-math -march=armv8.4-a+sve -msve-vector-bits=256 -flto -fuse-ld=lld -DNDEBUG" -DCMAKE_Fortran_FLAGS_RELEASE="-O3 -ffast-math -march=armv8.4-a+sve -msve-vector-bits=256 -flto -fuse-ld=lld -DNDEBUG" -DTEST_SUITE_FORTRAN=ON -DTEST_SUITE_SUBDIRS=Fujitsu -DTEST_SUITE_FUJITSU_WITH_FAST_MATH=ON "$\WORKSPACE/test/test-suite"

We track this bug report under https://linaro.atlassian.net/browse/LLVM-2266. (Require Linaro login) Please let us know if you have a fix.

If you have any questions regarding this report, please ask on linaro-toolchain@lists.linaro.org mailing list.

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The information below contains the details of the failures, and the ways to reproduce a debug environment:

You can find the failure logs in *.log.1.xz files in * http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-Ofast-sve_vls-l... The full lists of regressions and improvements as well as configure and make commands are in * http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-Ofast-sve_vls-l... The list of [ignored] baseline and flaky failures are in * http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-Ofast-sve_vls-l...

Fujitsu testsuite : https://github.com/fujitsu/compiler-test-suite/

Current build : http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-Ofast-sve_vls-l... Reference build : http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-Ofast-sve_vls-l...

Instruction to reproduce the build : https://gitlab.com/LinaroLtd/tcwg/ci/interesting-commits/-/raw/master/llvm/s...

Full commit : https://github.com/llvm/llvm-project/commit/efd053f8ef306e6fa21ab0cd1bd185ef...