[llvm] [X86] SimplifyDemandedBitsForTargetNode - PCMPGT(0,X) only demands the signbit of X (PR #163981)

Sat Oct 18 02:42:28 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-arm-ubuntu` running on `linaro-lldb-arm-ubuntu` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/18/builds/22048

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-unit :: Host/./HostTests/56/141 (2728 of 3730)
PASS: lldb-unit :: Host/./HostTests/57/141 (2729 of 3730)
PASS: lldb-unit :: Host/./HostTests/58/141 (2730 of 3730)
PASS: lldb-unit :: Host/./HostTests/59/141 (2731 of 3730)
PASS: lldb-unit :: Host/./HostTests/6/141 (2732 of 3730)
PASS: lldb-unit :: Host/./HostTests/60/141 (2733 of 3730)
PASS: lldb-unit :: Host/./HostTests/61/141 (2734 of 3730)
PASS: lldb-unit :: Host/./HostTests/62/141 (2735 of 3730)
PASS: lldb-unit :: Host/./HostTests/63/141 (2736 of 3730)
TIMEOUT: lldb-api :: tools/lldb-dap/attach/TestDAP_attach.py (2737 of 3730)
******************** TEST 'lldb-api :: tools/lldb-dap/attach/TestDAP_attach.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --arch armv8l --build-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/dsymutil --make /usr/bin/gmake --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib --cmake-build-type Release /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/tools/lldb-dap/attach -p TestDAP_attach.py
--
Exit Code: -9
Timeout: Reached timeout of 600 seconds

Command Output (stdout):
--
lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision 908b1164c0c433765364623fd14c9d0d2a975f92)
  clang revision 908b1164c0c433765364623fd14c9d0d2a975f92
  llvm revision 908b1164c0c433765364623fd14c9d0d2a975f92
Skipping the following test categories: ['libc++', 'msvcstl', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
========= DEBUG ADAPTER PROTOCOL LOGS =========
1760779913.740628481 (stdio) --> {"command":"initialize","type":"request","arguments":{"adapterID":"lldb-native","clientID":"vscode","columnsStartAt1":true,"linesStartAt1":true,"locale":"en-us","pathFormat":"path","supportsRunInTerminalRequest":true,"supportsVariablePaging":true,"supportsVariableType":true,"supportsStartDebuggingRequest":true,"supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryEvent":true,"$__lldb_sourceInitFile":false},"seq":1}
1760779913.741380215 (stdio) queued (command=initialize seq=1)
1760779913.749681234 (stdio) <-- {"body":{"$__lldb_version":"lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision 908b1164c0c433765364623fd14c9d0d2a975f92)\n  clang revision 908b1164c0c433765364623fd14c9d0d2a975f92\n  llvm revision 908b1164c0c433765364623fd14c9d0d2a975f92","completionTriggerCharacters":["."," ","\t"],"exceptionBreakpointFilters":[{"description":"C++ Catch","filter":"cpp_catch","label":"C++ Catch","supportsCondition":true},{"description":"C++ Throw","filter":"cpp_throw","label":"C++ Throw","supportsCondition":true},{"description":"Objective-C Catch","filter":"objc_catch","label":"Objective-C Catch","supportsCondition":true},{"description":"Objective-C Throw","filter":"objc_throw","label":"Objective-C Throw","supportsCondition":true}],"supportTerminateDebuggee":true,"supportsBreakpointLocationsRequest":true,"supportsCancelRequest":true,"supportsCompletionsRequest":true,"supportsConditionalBreakpoints":true,"supportsConfigurationDoneRequest":true,"supportsDataBreakpoints":true,"supportsDelayedStackTraceLoading":true,"supportsDisassembleRequest":true,"supportsEvaluateForHovers":true,"supportsExceptionFilterOptions":true,"supportsExceptionInfoRequest":true,"supportsFunctionBreakpoints":true,"supportsHitConditionalBreakpoints":true,"supportsInstructionBreakpoints":true,"supportsLogPoints":true,"supportsModuleSymbolsRequest":true,"supportsModulesRequest":true,"supportsReadMemoryRequest":true,"supportsSetVariable":true,"supportsSteppingGranularity":true,"supportsValueFormattingOptions":true,"supportsWriteMemoryRequest":true},"command":"initialize","request_seq":1,"seq":0,"success":true,"type":"response"}
1760779913.781291723 (stdio) --> {"command":"attach","type":"request","arguments":{"program":"/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/tools/lldb-dap/attach/TestDAP_attach.test_by_name/1f530188-0d60-44b4-9e51-9e26ee09dcee","initCommands":["settings clear --all","settings set symbols.enable-external-lookup false","settings set target.inherit-tcc true","settings set target.disable-aslr false","settings set target.detach-on-error false","settings set target.auto-apply-fixits false","settings set plugin.process.gdb-remote.packet-timeout 60","settings set symbols.clang-modules-cache-path \"/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api\"","settings set use-color false","settings set show-statusline false"]},"seq":2}
1760779913.781406641 (stdio) queued (command=attach seq=2)
1760779913.782224178 (stdio) <-- {"body":{"category":"console","output":"Running initCommands:\n"},"event":"output","seq":0,"type":"event"}
1760779913.782503843 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings clear --all\n"},"event":"output","seq":0,"type":"event"}
1760779913.782526016 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set symbols.enable-external-lookup false\n"},"event":"output","seq":0,"type":"event"}
1760779913.782542706 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set target.inherit-tcc true\n"},"event":"output","seq":0,"type":"event"}
1760779913.782556057 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set target.disable-aslr false\n"},"event":"output","seq":0,"type":"event"}
1760779913.782569885 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set target.detach-on-error false\n"},"event":"output","seq":0,"type":"event"}
1760779913.782582283 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set target.auto-apply-fixits false\n"},"event":"output","seq":0,"type":"event"}
1760779913.782739162 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set plugin.process.gdb-remote.packet-timeout 60\n"},"event":"output","seq":0,"type":"event"}
1760779913.782753706 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set symbols.clang-modules-cache-path \"/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api\"\n"},"event":"output","seq":0,"type":"event"}
1760779913.782767057 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set use-color false\n"},"event":"output","seq":0,"type":"event"}
1760779913.782779455 (stdio) <-- {"body":{"category":"console","output":"(lldb) settings set show-statusline false\n"},"event":"output","seq":0,"type":"event"}
1760779914.178235292 (stdio) <-- {"command":"attach","request_seq":2,"seq":0,"success":true,"type":"response"}
1760779914.179316759 (stdio) <-- {"body":{"module":{"addressRange":"0xe95b0000","id":"89138FA8-9BB1-F679-CDF9-9576E181F48D-80FCCD09","name":"libm.so.6","path":"/lib/arm-linux-gnueabihf/libm.so.6","symbolStatus":"Symbols not found."},"reason":"new"},"event":"module","seq":0,"type":"event"}
1760779914.179708481 (stdio) <-- {"event":"initialized","seq":0,"type":"event"}
1760779914.179907084 (stdio) <-- {"body":{"module":{"addressRange":"0xe9580000","id":"9DDE71F0-9E71-BAFC-974E-DCC0B92EDD11-824088FA","name":"libgcc_s.so.1","path":"/lib/arm-linux-gnueabihf/libgcc_s.so.1","symbolStatus":"Symbols not found."},"reason":"new"},"event":"module","seq":0,"type":"event"}

```

</details>

https://github.com/llvm/llvm-project/pull/163981