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[aarch64] Cannot select: constant:i128<0> for llvm.maximum.f128 #139380

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#206097
#142170
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[aarch64] Cannot select: constant:i128<0> for llvm.maximum.f128#139380
Bug
#206097
#142170
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nikic
Labels
crashPrefer [crash-on-valid] or [crash-on-invalid]llvm:SelectionDAGSelectionDAGISel as well

Description

@Urgau
Urgau
opened on May 10, 2025

I'm seeing an error when trying to use llvm.minimum.f128 and llvm.maximum.f128 on aarch64.

define fp128 @call_maximum_fp128(fp128 %x, fp128 %y) unnamed_addr #0 {
start:
  %0 = tail call fp128 @llvm.maximum.f128(fp128 %x, fp128 %y) #2
  ret fp128 %0
}

; Function Attrs: mustprogress nofree nosync nounwind readnone speculatable willreturn
declare fp128 @llvm.maximum.f128(fp128, fp128)
LLVM ERROR: Cannot select: 0x10c8bea0: i32 = setcc 0x10c888c0, Constant:i128<0>, seteq:ch
  0x10c888c0: i128 = bitcast 0x10c87fd8
    0x10c87fd8: f128,ch = CopyFromReg 0x10c105c0, Register:f128 %1
      0x10c87f60: f128 = Register %1
  0x10c8bbd0: i128 = Constant<0>
In function: call_maximum_fp128
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel <source>
1.	Running pass 'Function Pass Manager' on module '<source>'.
2.	Running pass 'AArch64 Instruction Selection' on function '@call_maximum_fp128'
 #0 0x0000000003b49548 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3b49548)
 #1 0x0000000003b47104 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #2 0x000073d283c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x000073d283c969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #4 0x000073d283c42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #5 0x000073d283c287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #6 0x0000000000784592 llvm::UniqueStringSaver::save(llvm::Twine const&) (.cold) StringSaver.cpp:0:0
 #7 0x00000000038f0888 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f0888)
 #8 0x00000000038f6bf9 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f6bf9)
 #9 0x0000000000bfa944 (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) AArch64ISelDAGToDAG.cpp:0:0
#10 0x00000000038edd74 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38edd74)
#11 0x00000000038fc882 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38fc882)
#12 0x00000000038ff1fa llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ff1fa)
#13 0x00000000039010d6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x39010d6)
#14 0x00000000038ed8f1 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ed8f1)
#15 0x0000000002bb4a78 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#16 0x0000000003135322 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3135322)
#17 0x00000000031355b1 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x31355b1)
#18 0x0000000003136f19 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3136f19)
#19 0x00000000008bec3f compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#20 0x000000000079977e main (/opt/compiler-explorer/clang-trunk/bin/llc+0x79977e)
#21 0x000073d283c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#22 0x000073d283c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#23 0x00000000008b6705 _start (/opt/compiler-explorer/clang-trunk/bin/llc+0x8b6705)
Program terminated with signal: SIGSEGV
Compiler returned: 139

https://godbolt.org/z/YWdK1ecM5

Activity

  1. llvmbot
    added
    new issue
    on May 10, 2025
  2. frederick-vs-ja
    added
    backend:AArch64
    crashPrefer [crash-on-valid] or [crash-on-invalid]
    llvm:SelectionDAGSelectionDAGISel as well
    and removed
    new issue
    on May 10, 2025
  3. frederick-vs-ja
    added the
    Bug
    issue type on May 10, 2025

  4. llvmbot commented on May 10, 2025

    @llvmbot
    llvmbot
    on May 10, 2025
    Member

    @llvm/issue-subscribers-backend-aarch64

    Author: None (Urgau)

    Details I'm seeing an error when trying to use `llvm.minimum.f128` and `llvm.maximum.f128` on aarch64. 
    define fp128 @<!-- -->call_maximum_fp128(fp128 %x, fp128 %y) unnamed_addr #<!-- -->0 {
start:
  %0 = tail call fp128 @<!-- -->llvm.maximum.f128(fp128 %x, fp128 %y) #<!-- -->2
  ret fp128 %0
}

; Function Attrs: mustprogress nofree nosync nounwind readnone speculatable willreturn
declare fp128 @<!-- -->llvm.maximum.f128(fp128, fp128)
    LLVM ERROR: Cannot select: 0x10c8bea0: i32 = setcc 0x10c888c0, Constant:i128&lt;0&gt;, seteq:ch
  0x10c888c0: i128 = bitcast 0x10c87fd8
    0x10c87fd8: f128,ch = CopyFromReg 0x10c105c0, Register:f128 %1
      0x10c87f60: f128 = Register %1
  0x10c8bbd0: i128 = Constant&lt;0&gt;
In function: call_maximum_fp128
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel &lt;source&gt;
1.	Running pass 'Function Pass Manager' on module '&lt;source&gt;'.
2.	Running pass 'AArch64 Instruction Selection' on function '@<!-- -->call_maximum_fp128'
 #<!-- -->0 0x0000000003b49548 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3b49548)
 #<!-- -->1 0x0000000003b47104 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #<!-- -->2 0x000073d283c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->3 0x000073d283c969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->4 0x000073d283c42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->5 0x000073d283c287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->6 0x0000000000784592 llvm::UniqueStringSaver::save(llvm::Twine const&amp;) (.cold) StringSaver.cpp:0:0
 #<!-- -->7 0x00000000038f0888 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f0888)
 #<!-- -->8 0x00000000038f6bf9 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f6bf9)
 #<!-- -->9 0x0000000000bfa944 (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) AArch64ISelDAGToDAG.cpp:0:0
#<!-- -->10 0x00000000038edd74 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38edd74)
#<!-- -->11 0x00000000038fc882 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38fc882)
#<!-- -->12 0x00000000038ff1fa llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&amp;) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ff1fa)
#<!-- -->13 0x00000000039010d6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&amp;) (/opt/compiler-explorer/clang-trunk/bin/llc+0x39010d6)
#<!-- -->14 0x00000000038ed8f1 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&amp;) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ed8f1)
#<!-- -->15 0x0000000002bb4a78 llvm::MachineFunctionPass::runOnFunction(llvm::Function&amp;) (.part.0) MachineFunctionPass.cpp:0:0
#<!-- -->16 0x0000000003135322 llvm::FPPassManager::runOnFunction(llvm::Function&amp;) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3135322)
#<!-- -->17 0x00000000031355b1 llvm::FPPassManager::runOnModule(llvm::Module&amp;) (/opt/compiler-explorer/clang-trunk/bin/llc+0x31355b1)
#<!-- -->18 0x0000000003136f19 llvm::legacy::PassManagerImpl::run(llvm::Module&amp;) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3136f19)
#<!-- -->19 0x00000000008bec3f compileModule(char**, llvm::LLVMContext&amp;) llc.cpp:0:0
#<!-- -->20 0x000000000079977e main (/opt/compiler-explorer/clang-trunk/bin/llc+0x79977e)
#<!-- -->21 0x000073d283c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->22 0x000073d283c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->23 0x00000000008b6705 _start (/opt/compiler-explorer/clang-trunk/bin/llc+0x8b6705)
Program terminated with signal: SIGSEGV
Compiler returned: 139

    https://godbolt.org/z/YWdK1ecM5

  5. nikic
    self-assigned this
    on May 30, 2025
  6. nikic
    closed this as completedin #142170on Jun 2, 2025
  7. nikic
    added a commit that references this issue on Jun 2, 2025

    [SDAG] Fix fmaximum legalization errors (#142170)

    58cc167
  8. llvm-sync
    added a commit that references this issue on Jun 2, 2025

    Automerge: [SDAG] Fix fmaximum legalization errors (#142170)

    1c7a1a1
  9. EugeneZelenko
    removed
    backend:AArch64
    on Jun 2, 2025
  10. nikic
    reopened this on Jun 4, 2025
  11. bwyma
    closed this as completedin 58cc167on Jun 23, 2025
  12. davemgreen
    reopened this on Jun 23, 2025
  13. markrvmurray
    added a commit that references this issue on Jun 14, 2026

    [SDAG] Fix fmaximum legalization errors (#142170)

    8ed8c7e
  14. nikic
    closed this as completedin #206097on Jun 29, 2026
  15. nikic
    added a commit that references this issue on Jun 29, 2026

    [CodeGen] Fix legalization of minimum/maximum (#206097)

    56385af
  16. llvm-sync
    added a commit that references this issue on Jun 29, 2026

    Automerge: [CodeGen] Fix legalization of minimum/maximum (#206097)

    de58cd1
  17. llvm-upstreamsync
    added a commit that references this issue on Jun 29, 2026

    Automerge: [CodeGen] Fix legalization of minimum/maximum (#206097)

    1d8b8a4
  18. LouisLu060211
    added a commit that references this issue on Jun 30, 2026

    [CodeGen] Fix legalization of minimum/maximum (llvm#206097)

    06bfff9
  19. maarcosrmz
    added a commit that references this issue on Jul 1, 2026

    [CodeGen] Fix legalization of minimum/maximum (llvm#206097)

    e92e588
  20. OpenHarmonySCM-noreply
    added a commit that references this issue on Jul 19, 2026

    [SDAG] Fix fmaximum legalization errors (#142170)

    9007342
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