[llvm][Hexagon] `unable to allocate function argument` crash in `llvm::HexagonTargetLowering::LowerFormalArguments()`

[alexrp]

target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
target triple = "hexagon-unknown-linux4.19.0-unknown"

define fastcc i16 @testing.expectEqualInner__anon_28689(ptr %0, <3 x i1> %1) {
Entry:
  ret i16 0
}

❯ llc --version | head -n2
LLVM (http://llvm.org/):
  LLVM version 19.1.5
❯ llc reduced2.ll -mtriple hexagon-linux -O0
LLVM ERROR: unable to allocate function argument #1
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: llc reduced2.ll -mtriple hexagon-linux -O0
1.      Running pass 'Function Pass Manager' on module 'reduced2.ll'.
2.      Running pass 'Hexagon DAG->DAG Pattern Instruction Selection' on function '@testing.expectEqualInner__anon_28689'
 #0 0x00007ce4dca4fc22 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/alexrp/Source/llvm-project/llvm/lib/Support/Unix/Signals.inc:727:3
 #1 0x00007ce4dca4d58f llvm::sys::RunSignalHandlers() /home/alexrp/Source/llvm-project/llvm/lib/Support/Signals.cpp:105:20
 #2 0x00007ce4dca4d926 SignalHandler(int) /home/alexrp/Source/llvm-project/llvm/lib/Support/Unix/Signals.inc:413:1
 #3 0x00007ce4db442990 (/lib/x86_64-linux-gnu/libc.so.6+0x42990)
 #4 0x00007ce4db499a1b __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #5 0x00007ce4db499a1b __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #6 0x00007ce4db499a1b pthread_kill ./nptl/pthread_kill.c:89:10
 #7 0x00007ce4db4428e6 gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #8 0x00007ce4db4268b7 abort ./stdlib/abort.c:81:7
 #9 0x00007ce4dc780c78 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::_M_replace(unsigned long, unsigned long, char const*, unsigned long) /usr/include/c++/13/bits/basic_string.tcc:540:21
#10 0x00007ce4dc780c78 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::assign(char const*) (.isra.0.cold) /usr/include/c++/13/bits/basic_string.h:1672:19
#11 0x00007ce4dcd88e55 llvm::CCState::AnalyzeFormalArguments(llvm::SmallVectorImpl<llvm::ISD::InputArg> const&, bool (*)(unsigned int, llvm::MVT, llvm::MVT, llvm::CCValAssign::LocInfo, llvm::ISD::ArgFlagsTy, llvm::CCState&)) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/CallingConvLower.cpp:95:1
#12 0x00007ce4e020bd6e llvm::HexagonTargetLowering::LowerFormalArguments(llvm::SDValue, unsigned int, bool, llvm::SmallVectorImpl<llvm::ISD::InputArg> const&, llvm::SDLoc const&, llvm::SelectionDAG&, llvm::SmallVectorImpl<llvm::SDValue>&) const /home/alexrp/Source/llvm-project/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp:814:34
#13 0x00007ce4dd576ede llvm::SelectionDAGISel::LowerArguments(llvm::Function const&) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:11620:46
#14 0x00007ce4dd636708 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1625:19
#15 0x00007ce4dd6375dc llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:632:22
#16 0x00007ce4e01dd5e4 llvm::HexagonDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) /home/alexrp/Source/llvm-project/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.h:47:17
#17 0x00007ce4dd622b57 llvm::OptLevelChanger::~OptLevelChanger() /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:268:11
#18 0x00007ce4dd622b57 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:375:1
#19 0x00007ce4dd622b57 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:346:6
#20 0x00007ce4dcf96fdf llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/MachineFunctionPass.cpp:94:33
#21 0x00007ce4dcc0d807 llvm::FPPassManager::runOnFunction(llvm::Function&) /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1450:7
#22 0x00007ce4dcc0da41 llvm::ilist_detail::node_base_prevnext<llvm::ilist_node_base<true, void>, true>::getNext() const /home/alexrp/Source/llvm-project/llvm/include/llvm/ADT/ilist_node_base.h:42:38
#23 0x00007ce4dcc0da41 llvm::ilist_node_impl<llvm::ilist_detail::node_options<llvm::Function, true, false, void, false, void>>::getNext() /home/alexrp/Source/llvm-project/llvm/include/llvm/ADT/ilist_node.h:117:66
#24 0x00007ce4dcc0da41 llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Function, true, false, void, false, void>, false, false>::operator++() /home/alexrp/Source/llvm-project/llvm/include/llvm/ADT/ilist_iterator.h:187:25
#25 0x00007ce4dcc0da41 llvm::FPPassManager::runOnModule(llvm::Module&) /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1485:22
#26 0x00007ce4dcc0e2c4 runOnModule /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1562:7
#27 0x00007ce4dcc0e2c4 llvm::legacy::PassManagerImpl::run(llvm::Module&) /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:541:55
#28 0x00005d438bb8ba3c compileModule(char**, llvm::LLVMContext&) /home/alexrp/Source/llvm-project/llvm/tools/llc/llc.cpp:742:34
#29 0x00005d438bb7ff77 main /home/alexrp/Source/llvm-project/llvm/tools/llc/llc.cpp:409:35
#30 0x00007ce4db428150 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#31 0x00007ce4db428209 call_init ./csu/../csu/libc-start.c:128:20
#32 0x00007ce4db428209 __libc_start_main ./csu/../csu/libc-start.c:347:5
#33 0x00005d438bb80cf5 _start (/opt/llvm-19/bin/llc+0x13cf5)

[alexrp]

FYI @androm3da

[llvmbot]

@llvm/issue-subscribers-backend-hexagon

Author: Alex Rønne Petersen (alexrp)

```llvm target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048" target triple = "hexagon-unknown-linux4.19.0-unknown"

define fastcc i16 @testing.expectEqualInner__anon_28689(ptr %0, <3 x i1> %1) {
Entry:
ret i16 0
}

```console
❯ llc --version | head -n2
LLVM (http://llvm.org/):
  LLVM version 19.1.5
❯ llc reduced2.ll -mtriple hexagon-linux -O0
LLVM ERROR: unable to allocate function argument #<!-- -->1
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: llc reduced2.ll -mtriple hexagon-linux -O0
1.      Running pass 'Function Pass Manager' on module 'reduced2.ll'.
2.      Running pass 'Hexagon DAG-&gt;DAG Pattern Instruction Selection' on function '@<!-- -->testing.expectEqualInner__anon_28689'
 #<!-- -->0 0x00007ce4dca4fc22 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) /home/alexrp/Source/llvm-project/llvm/lib/Support/Unix/Signals.inc:727:3
 #<!-- -->1 0x00007ce4dca4d58f llvm::sys::RunSignalHandlers() /home/alexrp/Source/llvm-project/llvm/lib/Support/Signals.cpp:105:20
 #<!-- -->2 0x00007ce4dca4d926 SignalHandler(int) /home/alexrp/Source/llvm-project/llvm/lib/Support/Unix/Signals.inc:413:1
 #<!-- -->3 0x00007ce4db442990 (/lib/x86_64-linux-gnu/libc.so.6+0x42990)
 #<!-- -->4 0x00007ce4db499a1b __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
 #<!-- -->5 0x00007ce4db499a1b __pthread_kill_internal ./nptl/pthread_kill.c:78:10
 #<!-- -->6 0x00007ce4db499a1b pthread_kill ./nptl/pthread_kill.c:89:10
 #<!-- -->7 0x00007ce4db4428e6 gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #<!-- -->8 0x00007ce4db4268b7 abort ./stdlib/abort.c:81:7
 #<!-- -->9 0x00007ce4dc780c78 std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;::_M_replace(unsigned long, unsigned long, char const*, unsigned long) /usr/include/c++/13/bits/basic_string.tcc:540:21
#<!-- -->10 0x00007ce4dc780c78 std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;::assign(char const*) (.isra.0.cold) /usr/include/c++/13/bits/basic_string.h:1672:19
#<!-- -->11 0x00007ce4dcd88e55 llvm::CCState::AnalyzeFormalArguments(llvm::SmallVectorImpl&lt;llvm::ISD::InputArg&gt; const&amp;, bool (*)(unsigned int, llvm::MVT, llvm::MVT, llvm::CCValAssign::LocInfo, llvm::ISD::ArgFlagsTy, llvm::CCState&amp;)) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/CallingConvLower.cpp:95:1
#<!-- -->12 0x00007ce4e020bd6e llvm::HexagonTargetLowering::LowerFormalArguments(llvm::SDValue, unsigned int, bool, llvm::SmallVectorImpl&lt;llvm::ISD::InputArg&gt; const&amp;, llvm::SDLoc const&amp;, llvm::SelectionDAG&amp;, llvm::SmallVectorImpl&lt;llvm::SDValue&gt;&amp;) const /home/alexrp/Source/llvm-project/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp:814:34
#<!-- -->13 0x00007ce4dd576ede llvm::SelectionDAGISel::LowerArguments(llvm::Function const&amp;) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:11620:46
#<!-- -->14 0x00007ce4dd636708 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&amp;) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1625:19
#<!-- -->15 0x00007ce4dd6375dc llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&amp;) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:632:22
#<!-- -->16 0x00007ce4e01dd5e4 llvm::HexagonDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&amp;) /home/alexrp/Source/llvm-project/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.h:47:17
#<!-- -->17 0x00007ce4dd622b57 llvm::OptLevelChanger::~OptLevelChanger() /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:268:11
#<!-- -->18 0x00007ce4dd622b57 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&amp;) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:375:1
#<!-- -->19 0x00007ce4dd622b57 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&amp;) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:346:6
#<!-- -->20 0x00007ce4dcf96fdf llvm::MachineFunctionPass::runOnFunction(llvm::Function&amp;) (.part.0) /home/alexrp/Source/llvm-project/llvm/lib/CodeGen/MachineFunctionPass.cpp:94:33
#<!-- -->21 0x00007ce4dcc0d807 llvm::FPPassManager::runOnFunction(llvm::Function&amp;) /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1450:7
#<!-- -->22 0x00007ce4dcc0da41 llvm::ilist_detail::node_base_prevnext&lt;llvm::ilist_node_base&lt;true, void&gt;, true&gt;::getNext() const /home/alexrp/Source/llvm-project/llvm/include/llvm/ADT/ilist_node_base.h:42:38
#<!-- -->23 0x00007ce4dcc0da41 llvm::ilist_node_impl&lt;llvm::ilist_detail::node_options&lt;llvm::Function, true, false, void, false, void&gt;&gt;::getNext() /home/alexrp/Source/llvm-project/llvm/include/llvm/ADT/ilist_node.h:117:66
#<!-- -->24 0x00007ce4dcc0da41 llvm::ilist_iterator&lt;llvm::ilist_detail::node_options&lt;llvm::Function, true, false, void, false, void&gt;, false, false&gt;::operator++() /home/alexrp/Source/llvm-project/llvm/include/llvm/ADT/ilist_iterator.h:187:25
#<!-- -->25 0x00007ce4dcc0da41 llvm::FPPassManager::runOnModule(llvm::Module&amp;) /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1485:22
#<!-- -->26 0x00007ce4dcc0e2c4 runOnModule /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1562:7
#<!-- -->27 0x00007ce4dcc0e2c4 llvm::legacy::PassManagerImpl::run(llvm::Module&amp;) /home/alexrp/Source/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:541:55
#<!-- -->28 0x00005d438bb8ba3c compileModule(char**, llvm::LLVMContext&amp;) /home/alexrp/Source/llvm-project/llvm/tools/llc/llc.cpp:742:34
#<!-- -->29 0x00005d438bb7ff77 main /home/alexrp/Source/llvm-project/llvm/tools/llc/llc.cpp:409:35
#<!-- -->30 0x00007ce4db428150 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#<!-- -->31 0x00007ce4db428209 call_init ./csu/../csu/libc-start.c:128:20
#<!-- -->32 0x00007ce4db428209 __libc_start_main ./csu/../csu/libc-start.c:347:5
#<!-- -->33 0x00005d438bb80cf5 _start (/opt/llvm-19/bin/llc+0x13cf5)

[androm3da]

<3 x i1> %1 - I wonder if this could be stumbling over a similar issue described in #59009 (though the specific symptom might be different).

Just i1 %1 seems to no longer fail with unable to allocate function argument (though at -O2 it fails with a different message in DomTreeBuilder::SemiNCAInfo<<...>>::verifyReachability()).