Thank you for pointing out the issue.

I believe this is a problem with the Fujistu test suite. I’ve created an issue there https://github.com/fujitsu/compiler-test-suite/issues/147

The fortran standard explicitly allows reassociation of floating point operations within a single programming language statement. The tests are too strict, passing only for strict left-to-write lowering of all floating point expressions.

As discussed in the RFC, https://discourse.llvm.org/t/rfc-flang-reasssociate-within-real-and-complex-... this was expected. The only difference was that with this more recent patch more tests than I anticipated were affected.

From: ci_notify@linaro.org ci_notify@linaro.org Date: Sunday, 13 September 2026 at 17:45 To: contact-ci-compiler-test-suite@cs.jp.fujitsu.com contact-ci-compiler-test-suite@cs.jp.fujitsu.com Cc: maxim.kuvyrkov@linaro.org maxim.kuvyrkov@linaro.org; Tom Eccles Tom.Eccles@arm.com Subject: [Linaro-TCWG-CI] llvmorg-24-init-8067-gf40e465b112a: 13 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-O3-neoverse_v1-sve_vla-mpipeliner-stack_arrays, after: | commit llvmorg-24-init-8067-gf40e465b112a | Author: Tom Eccles tom.eccles@arm.com | Date: Wed Sep 9 17:20:24 2026 +0100 | | [flang] Ignore subscript conversions when reassociating sums (#222302) | | Implicit conversions of INTEGER(4) array indices to SubscriptInteger | were treated as conversions in the surrounding floating-point sum, | preventing reassociation of ordinary array-element expressions. | ... 6 lines of the commit log omitted.

Produces 13 regressions: | | regressions.sum: | Running test-suite:Fujitsu/Fortran/0340 ... | FAIL: test-suite :: Fujitsu/Fortran/0340/Fujitsu-Fortran-0340_0099.test | FAIL: test-suite :: Fujitsu/Fortran/0340/Fujitsu-Fortran-0340_0117.test | FAIL: test-suite :: Fujitsu/Fortran/0340/Fujitsu-Fortran-0340_0181.test | FAIL: test-suite :: Fujitsu/Fortran/0340/Fujitsu-Fortran-0340_0185.test | ... and 15 more | # "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 -mcpu=neoverse-v1 -msve-vector-bits=scalable -mllvm -scalable-vectorization=preferred -mllvm -aarch64-enable-pipeliner -mllvm -pipeliner-mve-cg -DNDEBUG" -DCMAKE_CXX_FLAGS_RELEASE="-O3 -mcpu=neoverse-v1 -msve-vector-bits=scalable -mllvm -scalable-vectorization=preferred -mllvm -aarch64-enable-pipeliner -mllvm -pipeliner-mve-cg -DNDEBUG" -DCMAKE_Fortran_FLAGS_RELEASE="-O3 -mcpu=neoverse-v1 -msve-vector-bits=scalable -mllvm -scalable-vectorization=preferred -mllvm -aarch64-enable-pipeliner -mllvm -pipeliner-mve-cg -DNDEBUG -fstack-arrays" -DTEST_SUITE_FORTRAN=ON -DTEST_SUITE_SUBDIRS=Fujitsu "$\WORKSPACE/test/test-suite"

We track this bug report under https://linaro.atlassian.net/browse/LLVM-2276. (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.

-----------------8<--------------------------8<--------------------------8<--------------------------

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-O3-neoverse_v1-... 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-O3-neoverse_v1-... The list of [ignored] baseline and flaky failures are in * http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-O3-neoverse_v1-...

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

Current build : http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-O3-neoverse_v1-... Reference build : http://54.172.246.49:9090/jobs/tcwg_flang_test--main-aarch64-O3-neoverse_v1-...

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/f40e465b112a1a0cc1f6f544b33f3569... IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.