[llvm] [RISCV] Andes: model fast unaligned accesses for the 45-series (PR #221166)

Sun Sep 6 23:08:39 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-s390x-linux` running on `systemz-1` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/42/builds/10526

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'libFuzzer-s390x-default-Linux :: fuzzer-timeout.test' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
/home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/./bin/clang    -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta   --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer  /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutTest.cpp -o /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest
# executed command: /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/./bin/clang -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutTest.cpp -o /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest
# RUN: at line 2
/home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/./bin/clang    -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta   --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer  /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutEmptyTest.cpp -o /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutEmptyTest
# executed command: /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/./bin/clang -Wthread-safety -Wthread-safety-reference -Wthread-safety-beta --driver-mode=g++ -O2 -gline-tables-only -fsanitize=address,fuzzer -I/home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutEmptyTest.cpp -o /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutEmptyTest
# RUN: at line 3
not  /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 2>&1 | FileCheck /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=TimeoutTest
# executed command: not /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1
# executed command: FileCheck /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=TimeoutTest
# RUN: at line 12
not  /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/hi.txt 2>&1 | FileCheck /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=SingleInputTimeoutTest
# executed command: not /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/hi.txt
# executed command: FileCheck /home/buildbot/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=SingleInputTimeoutTest
# RUN: at line 16
/home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 -timeout_exitcode=0
# executed command: /home/buildbot/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 -timeout_exitcode=0
# .---command stderr------------
# | INFO: Running with entropic power schedule (0xFF, 100).
# | INFO: Seed: 329614559
# | INFO: Loaded 1 modules   (12 inline 8-bit counters): 12 [0x2aa1d24ce80, 0x2aa1d24ce8c), 
# | INFO: Loaded 1 PC tables (12 PCs): 12 [0x2aa1d24ce90,0x2aa1d24cf50), 
# | INFO: -max_len is not provided; libFuzzer will not generate inputs larger than 4096 bytes
# | INFO: A corpus is not provided, starting from an empty corpus
# | #2	INITED cov: 2 ft: 2 corp: 1/1b exec/s: 0 rss: 117Mb
# | #669	NEW    cov: 3 ft: 3 corp: 2/4b lim: 8 exec/s: 0 rss: 117Mb L: 3/3 MS: 2 CrossOver-InsertByte-
# | #857	REDUCE cov: 3 ft: 3 corp: 2/3b lim: 8 exec/s: 0 rss: 117Mb L: 2/2 MS: 3 ChangeByte-ShuffleBytes-EraseBytes-
# | #859	NEW    cov: 4 ft: 4 corp: 3/4b lim: 8 exec/s: 0 rss: 117Mb L: 1/2 MS: 2 ChangeBit-CrossOver-
# | #25766	NEW    cov: 5 ft: 5 corp: 4/50b lim: 254 exec/s: 0 rss: 117Mb L: 46/46 MS: 2 CopyPart-InsertRepeatedBytes-
# | #25883	REDUCE cov: 5 ft: 5 corp: 4/36b lim: 254 exec/s: 0 rss: 117Mb L: 32/32 MS: 2 ChangeBinInt-EraseBytes-
# | #25925	REDUCE cov: 5 ft: 5 corp: 4/20b lim: 254 exec/s: 0 rss: 117Mb L: 16/16 MS: 2 ChangeByte-EraseBytes-
# | #25948	REDUCE cov: 5 ft: 5 corp: 4/17b lim: 254 exec/s: 0 rss: 117Mb L: 13/13 MS: 3 CopyPart-CrossOver-EraseBytes-
# | #25994	REDUCE cov: 5 ft: 5 corp: 4/15b lim: 254 exec/s: 0 rss: 117Mb L: 11/11 MS: 1 EraseBytes-
# | #26050	REDUCE cov: 5 ft: 5 corp: 4/13b lim: 254 exec/s: 0 rss: 117Mb L: 9/9 MS: 1 EraseBytes-
# | #26161	REDUCE cov: 5 ft: 5 corp: 4/12b lim: 254 exec/s: 0 rss: 117Mb L: 8/8 MS: 1 EraseBytes-
# | #26201	NEW    cov: 6 ft: 6 corp: 5/14b lim: 254 exec/s: 0 rss: 117Mb L: 2/8 MS: 5 CrossOver-CopyPart-CrossOver-EraseBytes-EraseBytes-
# | #26293	REDUCE cov: 6 ft: 6 corp: 5/12b lim: 254 exec/s: 0 rss: 117Mb L: 6/6 MS: 2 ShuffleBytes-EraseBytes-
# | #26700	REDUCE cov: 6 ft: 6 corp: 5/10b lim: 254 exec/s: 0 rss: 117Mb L: 4/4 MS: 2 CrossOver-EraseBytes-
# | #26796	REDUCE cov: 6 ft: 6 corp: 5/9b lim: 254 exec/s: 0 rss: 117Mb L: 3/3 MS: 1 EraseBytes-
# | ALARM: working on the last Unit for 1 seconds
# |        and the timeout value is 1 (use -timeout=N to change)
# | MS: 1 InsertByte-; base unit: c74064c97231114b678d2204fde8965f65080db6
# | 0x48,0x69,0x21,0x69,
# | Hi!i
# | artifact_prefix='./'; Test unit written to ./timeout-c07078879f59203eeb77b1e2390b60cde5634ce6
...

```

</details>

https://github.com/llvm/llvm-project/pull/221166