[llvm] [InstCombine] Fix assertion failure in `foldVariableSignZeroExtensionOfVariableHighBitExtract` (PR #205148)

LLVM Continuous Integration via llvm-commits llvm-commits at lists.llvm.org
Mon Jul 6 23:51:57 PDT 2026 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `bolt-x86_64-ubuntu-nfc` running on `bolt-worker` while building `llvm` at step 9 "build-bolt".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/92/builds/40281

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

```
Step 9 (build-bolt) failure: build (failure)
...
135.358 [432/18/1194] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86InstPrinterCommon.cpp.o
135.560 [431/18/1195] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86IntelInstPrinter.cpp.o
136.518 [430/18/1196] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86WinEHUnwindV2.cpp.o
136.709 [429/18/1197] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86WinEHState.cpp.o
137.973 [428/18/1198] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCAsmInfo.cpp.o
138.041 [427/18/1199] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MnemonicTables.cpp.o
138.295 [426/18/1200] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86EncodingOptimization.cpp.o
138.686 [425/18/1201] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86WinEHUnwindV3.cpp.o
140.047 [424/18/1202] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/GISel/X86CallLowering.cpp.o
140.075 [423/18/1203] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCLFIRewriter.cpp.o
FAILED: lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCLFIRewriter.cpp.o 
ccache /usr/bin/c++ -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/build/lib/Target/X86/MCTargetDesc -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/MCTargetDesc -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86 -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/build/lib/Target/X86 -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/build/include -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fvisibility=hidden -UNDEBUG -fno-exceptions -funwind-tables -fno-rtti -std=c++17 -MD -MT lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCLFIRewriter.cpp.o -MF lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCLFIRewriter.cpp.o.d -o lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCLFIRewriter.cpp.o -c /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86MCLFIRewriter.cpp
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86MCLFIRewriter.cpp: In function ‘bool isGR64OrNone(llvm::MCRegister)’:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86MCLFIRewriter.cpp:69:10: error: ‘X86MCRegisterClasses’ was not declared in this scope
   69 |          X86MCRegisterClasses[X86::GR64RegClassID].contains(Reg);
      |          ^~~~~~~~~~~~~~~~~~~~
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86MCLFIRewriter.cpp: In member function ‘void llvm::X86::X86MCLFIRewriter::rewriteFSAccess(const llvm::MCInst&, llvm::MCStreamer&, const llvm::MCSubtargetInfo&)’:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86MCLFIRewriter.cpp:176:9: error: ‘X86MCRegisterClasses’ was not declared in this scope
  176 |         X86MCRegisterClasses[X86::GR64RegClassID].contains(DestReg) &&
      |         ^~~~~~~~~~~~~~~~~~~~
140.712 [423/17/1204] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCCodeEmitter.cpp.o
140.758 [423/16/1205] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MachObjectWriter.cpp.o
140.831 [423/15/1206] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86AsmBackend.cpp.o
141.143 [423/14/1207] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86ELFObjectWriter.cpp.o
141.208 [423/13/1208] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/GISel/X86RegisterBankInfo.cpp.o
141.372 [423/12/1209] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86TargetMachine.cpp.o
141.527 [423/11/1210] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86WinCOFFStreamer.cpp.o
141.554 [423/10/1211] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86WinCOFFObjectWriter.cpp.o
141.823 [423/9/1212] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/GISel/X86LegalizerInfo.cpp.o
143.224 [423/8/1213] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86WinCOFFTargetStreamer.cpp.o
143.255 [423/7/1214] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/GISel/X86PostLegalizerCombiner.cpp.o
143.748 [423/6/1215] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/GISel/X86PreLegalizerCombiner.cpp.o
144.210 [423/5/1216] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/GISel/X86InstructionSelector.cpp.o
144.855 [423/4/1217] Building CXX object lib/Target/X86/MCTargetDesc/CMakeFiles/LLVMX86Desc.dir/X86MCTargetDesc.cpp.o
145.641 [423/3/1218] Building CXX object lib/Target/X86/AsmParser/CMakeFiles/LLVMX86AsmParser.dir/X86AsmParser.cpp.o
145.978 [423/2/1219] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86TargetTransformInfo.cpp.o
169.166 [423/1/1220] Building CXX object lib/Target/X86/CMakeFiles/LLVMX86CodeGen.dir/X86ISelLowering.cpp.o
In file included from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/include/llvm/ADT/APFloat.h:18,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/include/llvm/CodeGenTypes/LowLevelType.h:31,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/include/llvm/CodeGen/MachineMemOperand.h:22,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/include/llvm/CodeGen/SelectionDAGTargetInfo.h:18,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/X86SelectionDAGInfo.h:16,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/X86ISelLowering.h:17,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp:14:
In destructor ‘llvm::APInt::~APInt()’,
    inlined from ‘LowerShift(llvm::SDValue, const llvm::X86Subtarget&, llvm::SelectionDAG&)::<lambda(llvm::SDValue)>’ at /home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/lib/Target/X86/X86ISelLowering.cpp:31413:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-nfc/llvm-project/llvm/include/llvm/ADT/APInt.h:193:18: warning: ‘void operator delete [](void*)’ called on a pointer to an unallocated object ‘72909780498219007’ [-Wfree-nonheap-object]
  193 |       delete[] U.pVal;
      |                  ^~~~

```

</details>

https://github.com/llvm/llvm-project/pull/205148

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