[llvm] [AArch64] Increase the max interleave factor to 4 for loops with reductions (PR #205612)

LLVM Continuous Integration via llvm-commits llvm-commits at lists.llvm.org
Mon Jun 29 20:08:38 PDT 2026 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-debian-fast` running on `gribozavr4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/56/builds/2512

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'lit :: verbosity.py' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
mkdir -p /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp
# executed command: mkdir -p /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp
# RUN: at line 7
not env -u FILECHECK_OPTS "/usr/bin/python3.9" /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical Inputs/verbosity 2> /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt > /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: not env -u FILECHECK_OPTS /usr/bin/python3.9 /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical Inputs/verbosity
# RUN: at line 8
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS
# RUN: at line 9
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit
# RUN: at line 43
not env -u FILECHECK_OPTS "/usr/bin/python3.9" /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --succinct Inputs/verbosity 2> /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt > /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: not env -u FILECHECK_OPTS /usr/bin/python3.9 /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --succinct Inputs/verbosity
# RUN: at line 44
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix SUCCINCT < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix SUCCINCT
# RUN: at line 45
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit
# RUN: at line 71
not env -u FILECHECK_OPTS "/usr/bin/python3.9" /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --verbose Inputs/verbosity 2> /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt > /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: not env -u FILECHECK_OPTS /usr/bin/python3.9 /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --verbose Inputs/verbosity
# RUN: at line 72
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix VERBOSE < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix VERBOSE
# RUN: at line 73
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit
# RUN: at line 136
not env -u FILECHECK_OPTS "/usr/bin/python3.9" /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --show-all Inputs/verbosity 2> /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt > /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: not env -u FILECHECK_OPTS /usr/bin/python3.9 /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --show-all Inputs/verbosity
# RUN: at line 137
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix SHOW-ALL < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix SHOW-ALL
# RUN: at line 138
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix NO-ARGS-ERR --implicit-check-not lit
# RUN: at line 232
not env -u FILECHECK_OPTS "/usr/bin/python3.9" /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --quiet Inputs/verbosity 2> /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stderr.txt > /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: not env -u FILECHECK_OPTS /usr/bin/python3.9 /b/1/clang-x86_64-debian-fast/llvm.src/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --quiet Inputs/verbosity
# RUN: at line 233
FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix QUIET < /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/Output/verbosity.py.tmp/stdout.txt
# executed command: FileCheck /b/1/clang-x86_64-debian-fast/llvm.obj/utils/lit/tests/verbosity.py --check-prefix QUIET
...

```

</details>

https://github.com/llvm/llvm-project/pull/205612

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