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Urgau opened this issue May 10, 2025 · 1 comment
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[aarch64] Cannot select: constant:i128<0> for llvm.maximum.f128 #139380

Urgau opened this issue May 10, 2025 · 1 comment
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backend:AArch64 crash Prefer [crash-on-valid] or [crash-on-invalid] llvm:SelectionDAG SelectionDAGISel as well

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@Urgau
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Urgau commented 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
@Urgau Urgau mentioned this issue May 10, 2025
Merged
@frederick-vs-ja frederick-vs-ja added backend:AArch64 crash Prefer [crash-on-valid] or [crash-on-invalid] llvm:SelectionDAG SelectionDAGISel as well and removed new issue labels May 10, 2025
@llvmbot
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llvmbot commented May 10, 2025

@llvm/issue-subscribers-backend-aarch64

Author: None (Urgau)

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

@tgross35 tgross35 mentioned this issue May 14, 2025
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