[llvm] [SeparateConstOffsetFromGEP] Decompose constant xor operand if possible (PR #135788)

Tue Jun 10 21:13:56 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/30432

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
5.418 [4/29/91] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang/lib/Decimal/decimal-to-binary.cpp.o
5.428 [4/28/92] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/external-unit.cpp.o
5.455 [4/27/93] Linking CXX shared library openmp/tools/archer/libarcher.so
5.464 [4/26/94] Building CXX object openmp/tools/archer/CMakeFiles/archer_static.dir/ompt-tsan.cpp.o
5.476 [3/26/95] Linking CXX static library openmp/tools/archer/libarcher_static.a
5.547 [3/25/96] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/assign.cpp.o
5.635 [3/24/97] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/edit-input.cpp.o
5.952 [3/23/98] Building CXX object openmp/runtime/src/CMakeFiles/omp.dir/kmp_runtime.cpp.o
6.144 [3/22/99] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/io-api-minimal.cpp.o
6.215 [3/21/100] Building CXX object flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o
FAILED: flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang++ --target=powerpc64le-unknown-linux-gnu -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/../flang/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/runtimes/runtimes-bins/flang-rt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=gnu++17 -UNDEBUG -fno-lto -fno-exceptions -fno-rtti -funwind-tables -fno-asynchronous-unwind-tables -U_GLIBCXX_ASSERTIONS -U_LIBCPP_ENABLE_ASSERTIONS -MD -MT flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o -MF flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o.d -o flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/lib/runtime/unit.cpp
PHI nodes not grouped at top of basic block!
  %niter = phi i64 [ 0, %for.cond2.preheader.us.i.new ], [ %niter.next.7, %for.body5.us.i ]
label %for.body5.us.i
in function _ZN7Fortran7runtime2io16ExternalFileUnit4EmitEPKcmmRNS1_14IoErrorHandlerE
fatal error: error in backend: Broken function found, compilation aborted!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang++ --target=powerpc64le-unknown-linux-gnu -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/../flang/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/runtimes/runtimes-bins/flang-rt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=gnu++17 -UNDEBUG -fno-lto -fno-exceptions -fno-rtti -funwind-tables -fno-asynchronous-unwind-tables -U_GLIBCXX_ASSERTIONS -U_LIBCPP_ENABLE_ASSERTIONS -MD -MT flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o -MF flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o.d -o flang-rt/lib/runtime/CMakeFiles/flang_rt.runtime.static.dir/unit.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/lib/runtime/unit.cpp
1.	<eof> parser at end of file
2.	Code generation
3.	Running pass 'Function Pass Manager' on module '/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/llvm-project/flang-rt/lib/runtime/unit.cpp'.
4.	Running pass 'Module Verifier' on function '@_ZN7Fortran7runtime2io16ExternalFileUnit4EmitEPKcmmRNS1_14IoErrorHandlerE'
 #0 0x0000000133eb5dcc llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4e05dcc)
 #1 0x0000000133eb6584 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #2 0x0000000133eb2ee0 llvm::sys::RunSignalHandlers() (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4e02ee0)
 #3 0x0000000133eb4ad4 llvm::sys::CleanupOnSignal(unsigned long) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4e04ad4)
 #4 0x0000000133df46bc (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) CrashRecoveryContext.cpp:0:0
 #5 0x0000000133df4614 llvm::CrashRecoveryContext::HandleExit(int) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4d44614)
 #6 0x0000000133eae734 llvm::sys::Process::Exit(int, bool) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4dfe734)
 #7 0x00000001329e6490 LLVMErrorHandler(void*, char const*, bool) cc1_main.cpp:0:0
 #8 0x0000000133dfe804 llvm::report_fatal_error(llvm::Twine const&, bool) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4d4e804)
 #9 0x0000000133dfe66c llvm::report_fatal_error(char const*, bool) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4d4e66c)
#10 0x0000000133916414 (anonymous namespace)::VerifierLegacyPass::runOnFunction(llvm::Function&) Verifier.cpp:0:0
#11 0x0000000133832350 llvm::FPPassManager::runOnFunction(llvm::Function&) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4782350)
#12 0x000000013383c1a8 llvm::FPPassManager::runOnModule(llvm::Module&) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x478c1a8)
#13 0x0000000133832df4 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x4782df4)
#14 0x000000013383c79c llvm::legacy::PassManager::run(llvm::Module&) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x478c79c)
#15 0x000000013478c4bc clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x56dc4bc)
#16 0x00000001347aabd8 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x56fabd8)
#17 0x00000001368edc10 clang::ParseAST(clang::Sema&, bool, bool) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x783dc10)
#18 0x0000000134e67eec clang::ASTFrontendAction::ExecuteAction() (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x5db7eec)
#19 0x00000001347b0844 clang::CodeGenAction::ExecuteAction() (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x5700844)
#20 0x0000000134e674a0 clang::FrontendAction::Execute() (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x5db74a0)
#21 0x0000000134dcb670 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x5d1b670)
#22 0x0000000134f8ce90 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x5edce90)
#23 0x00000001329e5a84 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/buildbots/llvm-external-buildbots/workers/ppc64le-flang-rhel-test/ppc64le-flang-rhel-clang-build/build/bin/clang+++0x3935a84)
#24 0x00000001329e16e0 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0

```

</details>

https://github.com/llvm/llvm-project/pull/135788