[llvm] [ConstantFold] Special case log1p +/-0.0 (PR #114635)

Sat Nov 2 19:16:26 PDT 2024

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/1739

<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 (stderr):
--
RUN: at line 1: /home/uweigand/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/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer  /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutTest.cpp -o /home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest
+ /home/uweigand/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/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutTest.cpp -o /home/uweigand/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/uweigand/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/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer  /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutEmptyTest.cpp -o /home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutEmptyTest
+ /home/uweigand/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/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutEmptyTest.cpp -o /home/uweigand/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/uweigand/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/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=TimeoutTest
+ not /home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1
+ FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=TimeoutTest
RUN: at line 12: not  /home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/hi.txt 2>&1 | FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=SingleInputTimeoutTest
+ not /home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/test/fuzzer/S390XDefaultLinuxConfig/Output/fuzzer-timeout.test.tmp-TimeoutTest -timeout=1 /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/hi.txt
+ FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/fuzzer-timeout.test --check-prefix=SingleInputTimeoutTest
RUN: at line 16: /home/uweigand/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
+ /home/uweigand/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
INFO: Running with entropic power schedule (0xFF, 100).
INFO: Seed: 1056632662
INFO: Loaded 1 modules   (13 inline 8-bit counters): 13 [0x2aa3facee60, 0x2aa3facee6d), 
INFO: Loaded 1 PC tables (13 PCs): 13 [0x2aa3facee70,0x2aa3facef40), 
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: 31Mb
#622	NEW    cov: 3 ft: 3 corp: 2/3b lim: 8 exec/s: 0 rss: 32Mb L: 2/2 MS: 5 ShuffleBytes-CopyPart-ChangeByte-CopyPart-InsertByte-
#801	NEW    cov: 4 ft: 4 corp: 3/4b lim: 8 exec/s: 0 rss: 32Mb L: 1/2 MS: 4 ShuffleBytes-CrossOver-ShuffleBytes-EraseBytes-
#16343	NEW    cov: 5 ft: 5 corp: 4/6b lim: 156 exec/s: 0 rss: 33Mb L: 2/2 MS: 2 ChangeBinInt-ChangeByte-
#16349	NEW    cov: 6 ft: 6 corp: 5/10b lim: 156 exec/s: 0 rss: 33Mb L: 4/4 MS: 1 CrossOver-
#17521	REDUCE cov: 6 ft: 6 corp: 5/9b lim: 163 exec/s: 0 rss: 33Mb L: 3/3 MS: 2 CopyPart-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: 94dd9e08c129c785f7f256e82fbe0a30e6d1ae40
0x48,0x69,0x21,
Hi!
artifact_prefix='./'; Test unit written to ./timeout-c0a0ad26a634840c67a210fefdda76577b03a111
Base64: SGkh
==3749828== ERROR: libFuzzer: timeout after 1 seconds
/home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/./bin/llvm-symbolizer: error: 'linux-vdso64.so.1': No such file or directory
    #0 0x02aa3fa480b5 in __sanitizer_print_stack_trace /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/asan/asan_stack.cpp:87:3
    #1 0x02aa3f9783a7 in fuzzer::PrintStackTrace() /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerUtil.cpp:210:5
    #2 0x02aa3f953365 in fuzzer::Fuzzer::AlarmCallback() /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:304:5
    #3 0x03ffa4afe47f  (linux-vdso64.so.1+0x47f) (BuildId: 56a2ed1b9a2fe4011b4622c1150e38aa29a9346f)
    #4 0x02aa3f975d81 in Popcountll /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerBuiltins.h:29:54
    #5 0x02aa3f975d81 in HandleCmp<unsigned int> /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerTracePC.cpp:389:30
    #6 0x02aa3f975d81 in __sanitizer_cov_trace_const_cmp4 /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerTracePC.cpp:513:15
    #7 0x02aa3fa8c791 in LLVMFuzzerTestOneInput /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/test/fuzzer/TimeoutTest.cpp:20:16
    #8 0x02aa3f955e45 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:619:13
    #9 0x02aa3f954565 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool, bool*) /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:516:7
    #10 0x02aa3f95724b in fuzzer::Fuzzer::MutateAndTestOne() /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:765:19
    #11 0x02aa3f958347 in fuzzer::Fuzzer::Loop(std::vector<fuzzer::SizedFile, std::allocator<fuzzer::SizedFile>>&) /home/uweigand/sandbox/buildbot/clang-s390x-linux/llvm/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:910:5
...

```

</details>

https://github.com/llvm/llvm-project/pull/114635